World of Ham Radio 1997/WOHR97_AmSoft_(1997-02-01).iso/usenets/1995_08/_homebre.txt

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The World of Ham Radio CD-ROM



From [e-mail] Fri Aug 04 16:48:30 1995
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From: [e-mail] (Dana Myers)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: CMOS Superkeyer 3
Date: 1 Aug 1995 19:18:49 GMT
Organization: SunSoft South, Los Angeles, CA
Lines: 48
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In article <[e-mail]>,
Jim Stafford-W4QO <[e-mail]> wrote:
>While you guys argue the merits of the whole thing being in QST in
>something other than a product review (I'm not sure how I find out about
>it if it's not in there), several folks have ordered and constructed the
>project.  Our club used the orginal SK2 as a club project and had barrels
>of fun making it.  Out of about 30 I know were constructed, no one ever
>brought up that they felt slighted because they didn't have the code.  The
>orginal was in 1990 ? QST and it is absolutely the best keyer I have ever
>found.  Of course, I made many constructional variations in the packaging
>- 1 1/2 x 2 x 2 1/2 inch bud case polished off on a buffing wheel to shine
>line a mirror.  A set of 3 AAA batteries last about a year in regular
>operating.  We had about 30 variations on the packaging and everyone
>enjoyed showing them off at the club.  BTW I plan to order the SK3 and
>install it in one of my QRP rigs.   I suspect that the proceeds from the
>SK2 of which I think about 5000 were sold, probably had something to do
>with their producing the SK3.  An occasional proprietary code project as
>good as this one certainly seems fine to me.

Certainly, as I am fond of pointing out, you don't have to know
what is inside a black box to use it effectively.  However, the
Super Keyer II and III both frustrated me in that the internals
are completely obscured.  Most black boxes I use have data which,
at the minimum, describes the internal architecture.  I generally
look at QST construction articles as a way to learn; I can learn
much without building something by looking at the diagrams and
reading the text.  I learned nothing about building a CPU based
keyer from reading how to use the SKII/III.

I personally think one of the areas that amateurs are falling
behind the most is in embedded system design and development.
This is probably why the omission of any design notes at all
for the SKII/III irritates me the most; here's a project that
could spark interest and learning in many amateurs about a
very important technology, but it won't spark any learning
to speak of.

If I had more time, I'd love to develop some ham widget and
article for QST, which exposes how embedded processors are
used, and how a design can be implemented partly in hardware
and partly in software.  I'd also love to see QST increase
the standards for construction articles to always require
a description of the internal operation of any "black box".

--
 * Dana H. Myers KK6JQ, DoD#: j | Views expressed here are      *
 * [phone]               | mine and do not necessarily   *
 * [e-mail]      | reflect those of my employer  *


From [e-mail] Fri Aug 04 16:48:31 1995
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From: Don Huff <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Do vacuum tubes have shelf life?
Date: 1 Aug 1995 19:49:46 GMT
Organization: Hewlett-Packard
Lines: 17
Message-ID: <3vm0gq$[e-mail]>
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I have tested 450TL's built before WWII, and they are perfect.  Also,
other glass xmitting tubes, such as 100TH/TL, 813, etc, which have been
lying around for decades and still unused.  They were all perfect, and the
transconductance and characteristic curves were within specs.   I have
also found new, unused (in original boxes) receiving tubes, such as as the
30, 41, etc.  They likewise tested like new.  I have
concluded that the shelf life of these kinds of tubes is INDEFINITE.  Tubesdo
not normally become "gassy" except through the outgassing of the internal parts
due to elevated temperature.  That is why xmitting tubes are pumped down while
their elements are red-hot (by passing large currents thru them). It is
fun to test these tubes, and plot their characteristics.  I have contemplated
making my own tube out of parts from broken ones, and pumping it down
and resealing the glass envelope. "Final here uses a W6JL-1 triode, OM"....

73,
                Don, W6JL



From [e-mail] Fri Aug 04 16:48:31 1995
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From: [e-mail] (Anthony G. Catalano)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Why variable BFO?
Date: 2 Aug 1995 00:49:29 -0400
Organization: The Pipeline
Lines: 27
Message-ID: <3vn04p$[e-mail]>
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On 31 Jul 1995 in article <Why variable BFO?>,
'[e-mail] (Ian Mitchell)' wrote:


>Has anyone noticed that the low cost SW receivers use a variable
>BFO for SSB reception, whilst the more expensive ones have a USB
>LSB switch?
>
>Is this because of the bigger frequency tuning steps in the lower
>cost receivers? Or does it have something to do with the bandwidth
>of the IF filter for SSB?
The el-cheapo BFO is simply a carrier injected into the AM detector.
I did the equivilent with an AM only portable SONY simply by placing my
grid-dip
meter around 455khz nearby. Opposite sideband rejection was non-existent.
A true USB/LSB receiver implements a narroband filter where the incoming
455khz
signal is shifted a bit up or down acordingly by mixing one of two crystals
(usb/lsb)
to provide the needed selectivity to reject the opposite sideband.
This method of true ssb reception is much more expensive to manufacture
than the
simple BFO method that usually works ok untill a nearby or opposite
sideband signal
appears.
Anthony G. Catalano WW2W



From [e-mail] Fri Aug 04 16:48:32 1995
Newsgroups: rec.radio.amateur.homebrew
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From: [e-mail] (William Beaty)
Subject: Vision by microwave
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Date: Wed, 2 Aug 1995 00:51:46 GMT
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I'm working on a microwave camera using mechanical scanning and an old
cop-radar detector.  This is strictly at the hobbyist level.  I hope to be
able to record slowscan stills of conductive objects scattered about in a
transparant insulating environment.  Should be interesting.  Anyone here
ever heard of such a thing?  Microwave mavens have any advice?  I'd like
to eventually try something better than 10GHZ, if I can find a source for
emitter and detector devices.


--
....................uuuu / oo \ uuuu........,.............................
William Beaty  voice:206-781-3320   bbs:206-789-0775    cserv:71241,3623
EE/Programmer/Science exhibit designer        http://www.eskimo.com/~billb/
Seattle, WA 98117  [e-mail]           SCIENCE HOBBYIST web page


From [e-mail] Fri Aug 04 16:48:33 1995
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From: Jim Devenport <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Easy 2m reciever?
Date: 2 Aug 1995 02:41:38 GMT
Organization: Los Alamos National Laboratory
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Ramsey Electronics has a 2M tunable FM receiver kit that
would be difficult to purchase parts separately for the
money:  29.95.  1-800-446-2295 item "FR-146"

I built their 220 version and it works quite well.
--
*********** Jim Devenport WB5AOX **************
*      PO Box 445, McIntosh NM 87032          *
*  505-832-1462 weekends, 667-1055 workdays   *
*        http://nis-www.lanl.gov/~jdport/     *
***********************************************




From [e-mail] Fri Aug 04 16:48:34 1995
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From: [e-mail] (Jeffrey Hill)
Newsgroups: rec.radio.amateur.homebrew
Subject: GTO Thyristors/source needed
Date: 2 Aug 1995 03:04:44 GMT
Organization: Prodigy Services Company  1-800-PRODIGY
Lines: 12
Distribution: world
Message-ID: <3vmq0c$[e-mail]>
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I'm designing an off-line convertor to provide plate potential for
several other devices and I need a source for gate turn-off SCRs. These
need to be able to switch about 10 A avg and be able to tolerate at 750 V
peak-reverse.

If you know of a dealer or distributor which can sell these in small
quantities, please reply by your choice of means.

thank you for your attention.

73, Jeff  AC4AQ/NNN0FBG



From [e-mail] Fri Aug 04 16:48:35 1995
Newsgroups: rec.radio.amateur.homebrew
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From: [e-mail] (Sean Norris)
Subject: Re: Vision by microwave
Message-ID: <[e-mail]>
Organization: NETCOM On-line Communication Services (408 261-4700 guest)
References: <[e-mail]>
Date: Wed, 2 Aug 1995 03:36:26 GMT
Lines: 42
Sender: [e-mail]

In article <[e-mail]>, William Beaty <[e-mail]> wrote:
>I'm working on a microwave camera using mechanical scanning and an old
>cop-radar detector.  This is strictly at the hobbyist level.  I hope to be
>able to record slowscan stills of conductive objects scattered about in a
>transparant insulating environment.  Should be interesting.  Anyone here
>ever heard of such a thing?  Microwave mavens have any advice?  I'd like
>to eventually try something better than 10GHZ, if I can find a source for
>emitter and detector devices.
>
>
>--
>....................uuuu / oo \ uuuu........,.............................
>William Beaty  voice:206-781-3320   bbs:206-789-0775    cserv:71241,3623
>EE/Programmer/Science exhibit designer        http://www.eskimo.com/~billb/
>Seattle, WA 98117  [e-mail]           SCIENCE HOBBYIST web page


I've used one before. It was a 94GHz millimeter-wave imaging system. A
little higher in frequency than you're doing, but the same idea. It also
was a mechanical scanning design due to the single reciever design. At 10
GHz though, I don't think you'll see much. The 94 GHz system that I
worked with used 94GHz frequency because of the fact that 94GHz happens to
be a frequency that passes through normal atmospheric conditions with less
attenuation than most other frequencies. Also the human body happens
to emit in the 94GHz region as well. It is similiar to the 3-5 um and
8-12 um infrared-bands, but with far less resolution due to the lower
frequency, but it can peneterate things that IR cannot, such as fog and
even thin walls perhaps.  The images that we got were very poor by todays
CCD camera standards. You could make out forms such as people, cars,
animals, and buildings but beyond that no further recognition was
possible. So at 10 GHz I think your going to be very disappointed, but
it does sound like a fun project and I wish you the best of luck.

E-mail me if you want to know any further details,

Sean

-----------------------------------------------------------------------------
Sean Norris     [e-mail]              RF Engineer
--KE6BTE--      Loyalty, above all else.        San Diego, CA
-----------------------------------------------------------------------------



From [e-mail] Fri Aug 04 16:48:36 1995
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From: Grant H Youngman <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Why variable BFO?
Date: 2 Aug 1995 03:47:56 GMT
Organization: PSI Public Usenet Link
Lines: 45
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Garry Foster <[e-mail]> wrote:
>

>This may all be true Grant but the question waas why do cheap recievers
>have BFO and good recievers have selectable sidebands.
>TYhe answer is that cheap recievers have cheap bfo because they are
>cheaper and work better with limited recievers. They certianly don't have
>bfo's because they are more complex and cost more.

I don't understand.  You don't need fixed frequency BFO's to have
selectible sidebands.  Many radios use one BFO and have TWO filters, one
for LSB, one for USB.  You kind of missed the point.  At 455KHz (typical
IF frequency) fixed frequency BFOs are more stable, but that doesn't mean
there is something inherently more costly or "better"in a fixed frequency
scheme.  At lower IF frequencies (50,60 KHz) crystal controlled BFOs are
not all that practical anyway -- and the BETTER gear that used these
frequencies provided control over the BFO frequency.

>
>And switchable frequency beat oscilators don't work at all unless you
>have very fine tunning steps 100 Hz min and 10 Hz preferable
>
Patently untrue.


>The best selectable sidebands change the filters not the beat frequency.

Some receivers do this as I stated above.  BUT, there is still good
reason to have the BFO frequency variable under operator control for the
reasons of audio response setting that I stated in my first reply.
>
>                                               Garry
>                                               WB0NNO
>Actually anymore gome of the real expensive recievers change the software
>to select the sidebands with a DSP unit running at the last IF.
>

Interesting, isn't it. We're back to the PHASING method of sideband
generation/detection again.  Only difference between these "real
expensive" units and the early sideband rigs of the 50's is a wee more
sophistication in the application of Norgaards principles of the phasing
method.

Grant



From [e-mail] Fri Aug 04 16:48:37 1995
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From: [e-mail] (Henk Remijn)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: QEX Magazine
Date: 2 Aug 1995 04:26:00 GMT
Organization: Henk Remijn
Lines: 20
Message-ID: <3vmuoo$[e-mail]>
References: <3vm17a$[e-mail]>
Reply-To: [e-mail] (Henk Remijn)
NNTP-Posting-Host: slip6.zeelandnet.nl
X-Newsreader: IBM NewsReader/2 v1.2

In <3vm17a$[e-mail]>, [e-mail] (Jonathon Woodward) writes:
>I am looking for the address and fax number of QEX magazine so I can
>subscribe.  I am particularly interested in an article published in the
>June 1993 edition on measuring SINAD with DSP.
>
>Any help would be appreciated.
>
>Cheers Jonathan
>
>
QEX is published by the ARRL, I guess you can find their address somewhere.
Henk


Henk Remijn                     Systems engineer at
PA3EOB (JO11WM)                 Cargill Wet Milling
Hansweert, The Netherlands      Bergen op Zoom
E-mail: [e-mail]   The Netherlands
         [e-mail]



From [e-mail] Fri Aug 04 16:48:37 1995
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From: Ference Kish <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Winding Coils
Date: Wed, 02 Aug 95 08:15:12 PDT
Lines: 22
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>
> It seems to me that I recently read something in QST (Technical
Correspondence, I think) about
> this topic.  Of course, I have a habit of bringing out the old issues and
going over them
> again, so it could have been in an older issue. The author developed some
new equations for
> calculating inductance and pointed out the errors in the old "reliable"
formulas.
>
> Maybe Zack will read this and remember.  Otherwise, say the word and I'll
try to find it
> again.
>
> Regards, Wes -- N7WS
>

YES, PLEASE
        regards, ference




From [e-mail] Fri Aug 04 16:48:39 1995
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From: [e-mail] (David Beach, NorFam, Memorial University)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: August QST CMOS Keyer 3
Date: 2 Aug 95 11:04:32 -0330 NST
Organization: Memorial University. St.John's Nfld, Canada
Lines: 50
Message-ID: <1995Aug2.110432.1@noah>
NNTP-Posting-Host: noah.ucs.mun.ca

I realize that the 'CMOS Superkeyer III' exchange and QST bashing is
almost reaching the flogging a dead horse stage so I think I will
pursue a slightly different aspect - what I would like to see.

I believe the Voice-Track Repeater Controller (QST June & July 95) is
a example of what QST MPU-based 'construction' articles (product
reviews are a different matter) should be like. Preprogrammed EPROMs,
disks with the source code and and PCBs are available from the author
at a reasonable cost. The code is also available from the ARRL as are
the PCB templates. The code is free for personal, non-commercial use.
Similar comments apply to the Talking Morse Code Practice Computer
(QST July 94).

Bravo to these authors for sharing their work with their amateur
friends! I would bet that most people who construct these will likely
buy parts from the authors anyway despite the availability of the
code - $15-20 for the pre-programmed EPROM is not a bad deal. And,
kits are a great convenience for those of us in the boonies.  The
experimenters among us still have the opportunity fiddle the code and
blow EPROMs if they wish.

How would I like things to be - ideally?

1)  Take a specific project for a specific MPU (e.g. keyer with
memory)

2)  Make available algorithms as well as source code to aid
understanding and to aid transfer to another MPU or modified hardware
platform.

3)  Write modularized code/algorithms so that one can more easily
add/subtract features that one wants (You do want a programmed
practice mode?  You don't? OK- your choice!)

4)  Post everything on the ARRL BBS for free distribution for
non-commercial use and modification (heck, some people might even
allow commercial use!)

So, anybody out there willing to write public domain code for
something like a simple keyer with memory, a more deluxe keyer, a
Morse code 'de-coder' (as in a recent 73 Am Rad article) or even a
keyer plus decoder plus digital freq display for QRP rigs?  Who knows
what someone might develop!

Anyway, I can't 'put up' the code because I am not (at this point) a
programmer so I will do my best to 'shut up' on further discussion -
but no promises!

David Beach VO2BD



From [e-mail] Fri Aug 04 16:48:40 1995
Newsgroups: rec.radio.amateur.homebrew
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From: jkbe@zeus (John_Bednar)
Subject: Re: August qst cmos keyer
Message-ID: <[e-mail]>
Sender: [e-mail] (Netnews Administration)
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Gary Coffman ([e-mail]) wrote:
: Speaking of keyers, has anyone built the keyer on the cover of the
: June issue of 73? It's a alarm clock, keyer, and code reader all in
: one, and it's also based on a preprogrammed microcontroller you have
: to buy from the author.

: Gary
The question is...can you duplicate the microcontroller or get the
eprom image from their BBS? That's what steams me the most about the
QST article. Many can duplicate the QST keyer for much less than $55.00
but the author(s) and/or Idiom Press locked out that possibility. Having
the source code isn't necessary to duplicating the keyer and that
doesn't appear to be the prevailing issue of this thread.


John



From [e-mail] Fri Aug 04 16:48:41 1995
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From: [e-mail] (Mario Klebsch DG1AM)
Newsgroups: rec.radio.amateur.homebrew,alt.radio.digital,fido.ham-radio,rec.radio.amateur.digital.misc,uk.radio.amateur,de.comm.ham
Subject: Re: need opinions&pointers: tech: PR in urban areas
Date: 2 Aug 95 12:45:27 GMT
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DB Wilhelm <[e-mail]> writes:

>[e-mail] (Tim Bray) wrote:
>>
>> > Tricks gearbeitet und Du kommst auf max gesicherte 9600 Bit/s !!!!!
>> Please tell me if I am wrong, but isn't this a uk.* group ????????
>Sorry Tim, this is a hr.* (that's Ham Radio) group, and it comes in
>all languages.  OTOH, my  version of "Netequette" says that English
>is the more commonly understood language and use of a newsgroup
>should be in the most commonly understood form.  To do otherwise
>is a waste of bandwidth, and should have been sent as e-mail.

This thread is crosposted to several newsgroups
(rec.radio.amateur.homebrew, alt.radio.digital, fido.ham-radio,
rec.radio.amateur.digital.misc, uk.radio.amateur,de.comm.ham) (where
is the hr.* ? ). Not everybody realizes crossposting, and since there
is a german newsgroup included, the original poster should expect
responses in german, too.

73, Mario
--
Mario Klebsch, DG1AM, [e-mail]                +49 531 / 391 - 7457
Institut fuer Robotik und Prozessinformatik der TU Braunschweig
Hamburger Strasse 267, 38114 Braunschweig, Germany


From [e-mail] Fri Aug 04 16:48:41 1995
Newsgroups: rec.radio.amateur.homebrew
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From: [e-mail] (Gary Wilcox)
Subject: Old GE UHF HT
X-Nntp-Posting-Host: m5.cacky.com
Message-ID: <[e-mail]>
Keywords: HT Convert
Sender: [e-mail] (News Administrator)
Reply-To: [e-mail] (Gary Wilcox)
Organization: Commonwealth Aluminum
Date: Wed, 2 Aug 1995 13:14:55 GMT
Lines: 12


All

        I have aquired an old GE UHF HT. It doesnt have a model number
but it has the number 121A MP1 Series. It has 2 channels in the 450 Mhz
range. Can this be converted to Amateur use? Is it as simple as changing
crystals. How hard would it be to build a VFO to replace the crystal.


Gary Wilcox
KE4VUN
[e-mail]


From [e-mail] Fri Aug 04 16:48:43 1995
Newsgroups: rec.radio.amateur.homebrew
Path: grape.epix.net!sc2c526a.ra.osd.mil!nova.sti.nasa.gov!lerc.nasa.gov!magnus.acs.ohio-state.edu!math.ohio-state.edu!howland.reston.ans.net!newsfeed.internetmci.com!news.sprintlink.net!uunet!in1.uu.net!world!daw
From: [e-mail] (David A Wallace)
Subject: Re: Program for coil windings
Message-ID: <[e-mail]>
Organization: The World, Public Access Internet, Brookline, MA
References: <[e-mail]>
Date: Wed, 2 Aug 1995 13:28:49 GMT
Lines: 129

10 REM SOLENOID COIL DESIGN
20 REM
30 REM FORMULA FROM ARRL HANDBOOK FOR AIR-WOUND COILS
40 REM
50 REM
60 REM
70 REM
80 REM
90 REM
100 DIM PT(40)
110 REM
120 REM Initialize wire table info (also from ARRL Handbook)
130 REM
140 PT(1) = 1 / .3
150 PT(2) = 1 / .265
160 PT(3) = 1 / .235
170 PT(4) = 1 / .215
180 PT(5) = 1 / .196
190 PT(6) = 1 / .175
200 PT(7) = 1 / .155
210 PT(8) = 7.6
220 PT(9) = 8.600001
230 PT(10) = 9.600001
240 PT(11) = 10.7
250 PT(12) = 12
260 PT(13) = 13.5
270 PT(14) = 15
280 PT(15) = 16.8
290 PT(16) = 18.9
300 PT(17) = 21.2
310 PT(18) = 23.6
320 PT(19) = 26.4
330 PT(20) = 29.4
340 PT(21) = 33.1
350 PT(22) = 37
360 PT(23) = 41.3
370 PT(24) = 46.3
380 PT(25) = 51.7
390 PT(26) = 58
400 PT(27) = 64.9
410 PT(28) = 72.7
420 PT(29) = 81.6
430 PT(30) = 90.5
440 PT(31) = 101
450 PT(32) = 113
460 PT(33) = 127
470 PT(34) = 143
480 PT(35) = 158
490 PT(36) = 175
500 PT(37) = 198
510 PT(38) = 224
520 PT(39) = 248
530 PT(40) = 282
540 REM
550 REM
560 REM
570 PI = 3.14159
580 REM
590 REM
600 INPUT "Do you need to calculate the inductance frist (y/n/q)"; A$
601 IF A$ = "y" THEN A$ = "Y"
602 IF A$ = "n" THEN A$ = "N"
603 IF A$ = "q" THEN A$ = "Q"
610 IF A$ <> "Q" THEN GOTO 630
620 STOP
630 IF A$ <> "Y" THEN GOTO 700
640 INPUT "Capacitor (pf)"; C
650 INPUT "Frequency (mHz)"; F
660 L = 1000000! / (4 * PI * PI * F * F * C)
670 PRINT "Inductance ="; L; "microhenries."
680 GOTO 1010
690 REM
700 REM
710 REM
720 REM
730 REM
740 REM
750 REM
760 REM
770 REM
780 REM
790 REM
800 REM
810 REM
820 REM
830 REM
840 REM
850 REM
860 REM
870 REM
880 REM
890 REM
900 REM
910 REM
920 REM
930 REM
940 REM
950 REM
960 REM
970 REM
980 REM
990 REM
1000 INPUT "Desired Inductance (uHy) "; L
1010 INPUT "Coil diameter (inches) "; D
1020 INPUT "Turns per inch (or wire gauge if negative) "; P0
1030 IF P0 < 0 THEN P = PT(-P0):  ELSE P = P0
1040 R = D / 2
1050 REM L = r * r * n * n / (9 * r + 10 * n / p)
1060 REM solved for n:
1070 REM 0 = r * r * n * n - L * 9 * r - L * 10 * n / p
1080 A = R * R
1090 B = -L * 10 / P
1100 C = -L * 9 * R
1110 REM solve quadratic equation (-b + sqr(b*b - 4 * a * c)) / (2 * a)
1120 N = -B / (2 * A) + SQR(B * B - 4 * A * C) / (2 * A)
1130 N = 10 * N
1140 N = INT(N)
1150 N = N / 10
1160 PRINT "For an inductance of"; L; "uHy on a"; D; "inch dia. form, wind"; N;
1170 PRINT "turns "
1180 IF P0 < 0 THEN PRINT "of #"; -P0; "wire.";
1181 ELSE PRINT "at"; P0; "turns per inch.";
1190 W = N / P
1200 W = W * 100
1210 W = INT(W)
1220 W = W / 100
1230 PRINT "  Coil will be"; W; "inches long."
1240 GOTO 600



From [e-mail] Fri Aug 04 16:48:43 1995
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From: [e-mail] (Bill Kirkland)
Newsgroups: rec.radio.amateur.homebrew
Subject: Coil data for Rhode's QST article
Date: 2 Aug 1995 13:31:47 GMT
Organization: Bell Northern Research Ltd.
Lines: 7
Message-ID: <3vnuo3$[e-mail]>
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Does anyone know the coil data, i.e. coil forms, used in the circuits
described by Rhode in his March 95 QST article "A High-Performance Hybrid
Frequency Synthesizer"?  The winding data is there but there is no information
 on the coil forms.

Bill Kirkland
VE3JHU


From [e-mail] Fri Aug 04 16:48:44 1995
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From: [e-mail] (Eric Jacksch)
Newsgroups: rec.radio.amateur.homebrew,rec.radio.amateur.misc
Subject: VHF/UHF XTAL CW XMITTER
Date: 2 Aug 1995 13:51:19 GMT
Organization: Bell Northern Research
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Xref: grape.epix.net rec.radio.amateur.homebrew:8676 rec.radio.amateur.misc:84198

I'm interested in building a low power crystal controlled CW transmitter for
for the 2m, 220 MHz, or 70cm bands. (radio to operate on one freqency only...
the 220 band would be nice, but I'm interested in the others as well).

The application is a low speed data link involving microcontrollers and
PC's...I want to keep it as small, light, and inexpensive as possible.

I'd appreciate any leads on schematics, plans, kits, etc.

Thanks,
Eric.
VE3 XEJ

(mail replies appreciated)
[e-mail]
[e-mail]



From [e-mail] Fri Aug 04 16:48:44 1995
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From: [e-mail] (Gary Jones)
Newsgroups: rec.radio.amateur.homebrew
Subject: FM 900
Date: Wed, 02 Aug 1995 14:09:03 GMT
Organization: Edith Cowan University
Lines: 15
Message-ID: <3vo44e$[e-mail]>
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I'm posting this for a friend with no net access, excuse me if i'm
vague (his topic, not mine)

My friend is looking for the source code/file for a Philips FM 900
radio. He tells me to write that it's 8602 source code.

Ring any bells with anyone?

Please reply via email to
[e-mail]

Thanks,

Gary.



From [e-mail] Fri Aug 04 16:48:45 1995
From: [e-mail] (Bob Liesenfeld)
Path: grape.epix.net!sc2c526a.ra.osd.mil!nova.sti.nasa.gov!lerc.nasa.gov!magnus.acs.ohio-state.edu!math.ohio-state.edu!howland.reston.ans.net!news.sprintlink.net!uunet!in1.uu.net!rosevax!hamlink!fredmail
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Super cmos iii keyer
Message-ID: <[e-mail]>
Date: Wed, 02 Aug 1995 14:19:10 -0100
X-FTN-To: [e-mail]
Lines: 6

No flames here. Could not have said it better myself.
Bob   WB0POQ

    Technology is *OUT* of control.....




From [e-mail] Fri Aug 04 16:48:46 1995
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From: [e-mail] (David Negaard (Oberon-))
Newsgroups: rec.radio.amateur.homebrew
Subject: Project idea (WAS: Re: CMOS Superkeyer 3)
Date: 02 Aug 1995 14:49:31 GMT
Organization: INS Information Services, Des Moines, Iowa, USA
Lines: 43
Distribution: world
Message-ID: <[e-mail]>
References: <[e-mail]>
        <3vlump$[e-mail]>
NNTP-Posting-Host: draagen.graceland.edu
In-reply-to: [e-mail]'s message of 1 Aug 1995 19:18:49 GMT

>>>>> "Dana" == Dana Myers <[e-mail]> writes:

Dana> In article <[e-mail]>,
Dana> Jim Stafford-W4QO <[e-mail]> wrote:
>> [...]

Dana> [...] I personally think one of the areas that amateurs are
Dana> falling behind the most is in embedded system design and
Dana> development.  This is probably why the omission of any design
Dana> notes at all for the SKII/III irritates me the most; here's a
Dana> project that could spark interest and learning in many amateurs
Dana> about a very important technology, but it won't spark any
Dana> learning to speak of.

On this note, I remember seeing a page or two on the Baycomm Web
server discussing a modem that had been implemented with a
microcontroller and software...three chips total, I think.  I couldn't
find it the last time I visited, but the idea intrigued me.  If I only
knew a _little_ more than I do, I'd be interested in using this method
to implement the modems I'm hoping to need to go with the OptoSCC I'm
hoping to have.  In fact, I'd be interested in doing this even without
knowing a little more: I can follow simple instructions...

Dana> If I had more time, I'd love to develop some ham widget and
Dana> article for QST, which exposes how embedded processors are used,
Dana> and how a design can be implemented partly in hardware and
Dana> partly in software.  I'd also love to see QST increase the
Dana> standards for construction articles to always require a
Dana> description of the internal operation of any "black box".

Ditto.  And if anyone has any references that might point the way for
a project like the one mentioned above (I'm especially interested in
PSK satellite modes, but would be intrigued by almost any
implementation), please let me know.

Dana> * Dana H. Myers KK6JQ, DoD#: j | Views expressed here are      *
Dana> * [phone]               | mine and do not necessarily   *
Dana> * [e-mail]      | reflect those of my employer  *
--
o David Negaard                   o [e-mail]
o Help Desk Technician            o http://www.graceland.edu/~negaard
o 700 College Avenue              o linux-phile
o Lamoni, IA  50140               o 73 de KB0PXK


From [e-mail] Fri Aug 04 16:48:47 1995
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From: [e-mail] (Thomas C Sefranek)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Current balun
Date: 2 Aug 1995 15:00:05 -0400
Organization: iii.net
Lines: 17
Message-ID: <3vohvl$[e-mail]>
References: <3vg7dp$mgl$[e-mail]>
NNTP-Posting-Host: iii2.iii.net
Keywords: Current baluns

Well Murray,
            Do you expect the cable manufacturers to be :
Should they "know" what frequency your going to use their cable for?
Should they "know" what length to make your cable?
Should they "know" what power level your going to use?
Should they "know" what attenuation you consider adequate?

The torroid materials have a frequency range!
They have a finite power handling ability/volume!
They have finite attenuation characteristics.

Enough?

Tom

--
Thomas C. J. Sefranek  WA1RHP  Work: 508-425-2200  Home: 508-425-6672


From [e-mail] Fri Aug 04 16:48:48 1995
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From: [e-mail] (Thomas C Sefranek)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: August qst cmos keyer
Date: 2 Aug 1995 15:03:50 -0400
Organization: iii.net
Lines: 13
Message-ID: <3voi6m$[e-mail]>
References: <[e-mail]> <[e-mail]> <[e-mail]>
NNTP-Posting-Host: iii2.iii.net

Hey clue-less ones!

Read the archives!

If you continue to clutter this group with the same old tired arguments...
I'm gonna post a rumor I heard about Cregg Shargold, a dying boy...

:)

Tom

--
Thomas C. J. Sefranek  WA1RHP  Work: 508-425-2200  Home: 508-425-6672


From [e-mail] Fri Aug 04 16:48:49 1995
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From: Jim Devenport <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Old GE UHF HT
Date: 2 Aug 1995 16:06:35 GMT
Organization: Los Alamos National Laboratory
Lines: 27
Message-ID: <3vo7qb$[e-mail]>
References: <[e-mail]>
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To: [e-mail]


Yes, it is as easy as changing crystals.... but you will
have to align the transmitter and receiver RF &
oascillator/driver stages for best sensitivity and output.
 If the original frequency is between 450 and 460 MHZ this
is likely all you'll have to do.  If it is much above 460
MHZ you may well not be able to align it to specs without
modifying it by changing capacitance values in various
stages in which case you'll certainly want a repair manual
for it.  Depending on what model GE it is, it may be one of
the series that employs a completely separate receiver and
transmitter, that might make it easily made into a low
power repeater.
VFO's of course are possible but very hard to keep stable
enough for satisfactory operation at these frequencies.
The necessary VFO output might be as low as 36 MHZ but
since it is multiplied in frequency by subsequent stages
whatever instability or error occurs is also multiplied by
a like amount.
--
*********** Jim Devenport WB5AOX **************
*      PO Box 445, McIntosh NM 87032          *
*  505-832-1462 weekends, 667-1055 workdays   *
*        http://nis-www.lanl.gov/~jdport/     *
***********************************************




From [e-mail] Fri Aug 04 16:48:49 1995
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From: [e-mail] (PFZouave)
Newsgroups: rec.radio.amateur.homebrew
Subject: Longwave Transmitter
Date: 2 Aug 1995 18:50:47 -0400
Organization: America Online, Inc. (1-800-827-6364)
Lines: 11
Sender: [e-mail]
Message-ID: <3vovg7$[e-mail]>
Reply-To: [e-mail] (PFZouave)
NNTP-Posting-Host: newsbf02.mail.aol.com

It was my understanding that some segment of the longwave band had been
set aside for license-free experimentation, provided you stayed under a
certain power level. In fact, I have vague memories of an article for such
a transmitter in a back issue of Radio Electronics (or some similar
magazine).

Does any one know the rules regarding longwave experimentation? Is there a
web site for this sort of data? Please email any responses.
[e-mail]
Pete Friedrichs
*** Common Sense Is Not That Common ***


From [e-mail] Fri Aug 04 16:48:50 1995
Path: grape.epix.net!news.sprintlink.net!psgrain!news.tek.com!gv-gate.gvg.tek.com!usenet
From: Grover Cleveland <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: (no subject)
Date: 2 Aug 1995 18:58:50 GMT
Organization: The Grass Valley Group Inc.
Lines: 5
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Can someone please point me to the qrp mailing list?

73 de WT6P




From [e-mail] Fri Aug 04 16:48:51 1995
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From: Leon Heller <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Easy 2m reciever?
Date: Wed, 02 Aug 95 19:14:44 GMT
Organization: Home
Lines: 17
Message-ID: <[e-mail]>
References: <3vm1sh$[e-mail]>
Reply-To: [e-mail]
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In article <3vm1sh$[e-mail]>
           [e-mail] "John Lumkes" writes:

> Looking for an easy to build circuit plan for a 2m reciever. Just
> something to get me started in homebrewing and such that I can monitor
> the local repeater signals. References to mag articles, chips, anything...

You can build a single chip 2m Rx with the Philips TDA7000. It will be
out of spec. but I got one to receive 2m packet without any problems. They
are intended for VHF/FM broadcast reception.

Leon
--
Leon Heller, G1HSM                | "Do not adjust your mind, there is
E-mail [e-mail]  |  a fault in reality": on a wall
Phone: [phone]         |  many years ago in Oxford.


From [e-mail] Fri Aug 04 16:48:51 1995
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From: [e-mail] (Sergei Kulyov)
Newsgroups: rec.radio.amateur.homebrew
Subject: Need Cardwell Condensor Co. info
Date: 2 Aug 1995 19:38:14 -0400
Organization: The Greater Columbus FreeNet
Lines: 10
Message-ID: <3vp296$[e-mail]>
NNTP-Posting-Host: acme.freenet.columbus.oh.us
X-Newsreader: TIN [version 1.2 PL2]


Hi gang,

I'm looking for the address or fax of Cardwell Condensor Co.
which produced air vary capacitors.

Appreciate for any help.

73! Sergei
AA8OT, UA3AP


From [e-mail] Fri Aug 04 16:48:52 1995
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From: dan drumm <drumm>
Newsgroups: rec.radio.amateur.antenna,rec.radio.amateur.homebrew,rec.radio.amateur.misc,rec.radio.amateur.equipment
Subject: ROTOR - Channel master - old tv salvage
Date: 2 Aug 1995 20:38:14 GMT
Organization: University of Wisconsin Eau Claire
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Xref: grape.epix.net rec.radio.amateur.antenna:12519 rec.radio.amateur.homebrew:8687 rec.radio.amateur.misc:84222 rec.radio.amateur.equipment:15344

Ground score!
I found an antenna rotor, but have little not no info.

Does anyone have/use/know about the channel master crown.  I got
it from someone who was reroofing  --complete with tripod for the
roof, but I do not have the controler, and I do not even know the
voltage it needs (my guess is 12v).  All I can see are the three
wires used to control it.

It is real old, but fits nicely into me new budget;  it was free.

..any help or references appreciated.


Dan Drumm
N9VOX (general is comming real soon now, but I like this call!)
[e-mail]

                                Wishing you and extra hour each day.



From [e-mail] Fri Aug 04 16:48:53 1995
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From: [e-mail] (Scott Carpenter)
Newsgroups: rec.radio.amateur.homebrew
Subject: Good SPICE book
Date: 2 Aug 1995 21:10:52 GMT
Organization: Southern Methodist University - School of Engineering and Applied Science
Lines: 4
Sender: Scott Carpenter
Distribution: world
Message-ID: <3vopks$[e-mail]>
NNTP-Posting-Host: express.seas.smu.edu
Keywords: SPICE
Cc: carp@gpspc_rsc.comsys.rockwell.com

Would someone please recommend a good book for
a beginner SPICE user?  Thanks!




From [e-mail] Fri Aug 04 16:48:53 1995
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From: Robert Clegg <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Radio Module Wanted
Date: 2 Aug 1995 21:11:53 GMT
Organization: SoNet - The first Internet provider on the south coast
Lines: 3
Message-ID: <3vopmp$[e-mail]>
NNTP-Posting-Host: castle.aladdin.co.uk

Wanted: The R/F Module (M57737) For Yaesu FT720R
Send Via: [e-mail]



From [e-mail] Fri Aug 04 16:48:54 1995
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From: [e-mail] (Ian Mitchell)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Why variable BFO?
Date: 2 Aug 1995 23:39:20 GMT
Organization: University of Tasmania
Lines: 18
Message-ID: <3vp2b8$[e-mail]>
References: <3vn04p$[e-mail]>
NNTP-Posting-Host: pc122.research.utas.edu.au
Mime-Version: 1.0
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In article <3vn04p$[e-mail]>, [e-mail]
says...
>The el-cheapo BFO is simply a carrier injected into the AM detector.
>This method of true ssb reception is much more expensive to manufacture
>than the simple BFO method that usually works ok untill a nearby or opposite
>sideband signal appears.
>Anthony G. Catalano WW2W


Ok, does that mean in a low cost receiver with a not so narrow IF filter,
a fixed frequency BFO (frequency set to middle of IF) could be used to
resolve an SSB signal, regardless of which side band the signal is on,
as long as there are no other nearby signals?

And presumably small tuning steps would be a necessity.

Thanks, Ian



From [e-mail] Fri Aug 04 16:48:55 1995
Path: grape.epix.net!sc2c526a.ra.osd.mil!nova.sti.nasa.gov!lerc.nasa.gov!magnus.acs.ohio-state.edu!math.ohio-state.edu!howland.reston.ans.net!news.sprintlink.net!sonnet1.sonnet.com!news
From: [e-mail] (Wyatt Earp)
Newsgroups: alt.radio.pirate,sci.electronics,rec.radio.amateur.homebrew
Subject: Anyone use and/or like the Ramsey TV-6 transmitter?
Date: Thu, 03 Aug 1995 01:02:08 GMT
Organization: SONNET Networking - Modesto Sonora Stockton (800)50-ONLINE
Lines: 37
Message-ID: <3vp73l$[e-mail]>
NNTP-Posting-Host: ppp14.moa.com
X-Newsreader: Forte Free Agent 1.0.82
Xref: grape.epix.net alt.radio.pirate:9431 sci.electronics:138055 rec.radio.amateur.homebrew:8693

I bought the Ramsey TV-6 kit and the LPA-1 1 watt amp with the hopes
of transmitting my cable box / VCR to all the TV's in the house and
not have to run coax.  The kits went together with no problems, but
the performance from the TV-6 transmitter is nothing to brag about.  I
have managed to get a crappy, rolling, wavy black and white picture
with some audio.  Doesn't matter if I use the TV-6 kit alone with the
built in whip, an external 'dipole' of (2) 3.5 foot wires, or the
LPA-1 and the dipole.  It is looking like this will never replace
running coax to every TV in the house.

I plan to build a better antenna by tapeing the two wires of the
dipole to a stick.  Should my coax lead-in be a certain length?  Right
now it is an RCA plug with two 3.5 foot wires sticking out.  I string
them on the floor 180 deg apart.

Adjusting coil L4 to tune the sucker to the right channel is not an
easy process.  I played with it for several hours, but never got a
good picture with any antenna / tuning combo.  It would seem to me
that any good TV transmitter (or FM too) would have to have a crystal
oscillator to work with modern digital tuners.

To watch the picture I mainly used my Spectricon 12" portable with
analog looking tuner (The old 2 knob type) with AFT and rabbit ears.
It was on sale at Goodguys a few years ago and gets cable great.

If you read the catalog, the unit should transmit hundreds of feet
with the crummy whip antenna.  When I bought the LPA-1 too, I was
worried that I would transmit to a large chunk of my town!  Does
anyone use the TV-6 to actually watch TV? Or is it a toy?  Should I
design and build a crystal oscillator for it?  I don't see why I would
want to change channels much once I picked one.  I live 30 miles from
the nearest TV station, BTW.

Thanks,

Wyatt



From [e-mail] Fri Aug 04 16:48:56 1995
Path: grape.epix.net!news.sprintlink.net!howland.reston.ans.net!agate!!tvr
From: [e-mail] (Tovar)
Newsgroups: alt.cad,aus.radio.amateur.misc,rec.radio.amateur.homebrew
Subject: Re: Data wanted on Motorola MRF571/MC
Date: 03 Aug 1995 01:59:47 GMT
Organization: CNMAT
Lines: 20
Message-ID: <[e-mail]>
References: <3vik3l$gql$[e-mail]> <3vj2cj$[e-mail]>
NNTP-Posting-Host: les.cnmat.berkeley.edu
In-reply-to: [e-mail]'s message of Mon, 31 Jul 1995 17:03:17 GMT
Xref: grape.epix.net alt.cad:6382 rec.radio.amateur.homebrew:8694

    [e-mail] (David Brooks) wrote:

    >Does anyone know of a site carrying data sheets and/or SPICE models for
    >Motorola RF power bipolars, specifically MRF571/MC ?

    Dave, try Motorola's WWW site.  It is at http://motserv.indirect.com/
    Lots of technical info and your requests for additional catalogs or
    info are promptly serviced.  ---Mike

I think you may need to use their fax-back service

        http://motserv.indirect.com/home2/fax_rqst.html

as searching their (very preliminary set of) databooks for "MRF571" only
yields hits on a higher voltage version of the MRF5711 (MRF0211LT1), a
surface mount component.

I have also had good experiences using their services.

                -- KD6PAG  (networking old-timer, RF newbie)


From [e-mail] Fri Aug 04 16:48:57 1995
Path: grape.epix.net!sc2c526a.ra.osd.mil!nova.sti.nasa.gov!lerc.nasa.gov!magnus.acs.ohio-state.edu!math.ohio-state.edu!howland.reston.ans.net!newsjunkie.ans.net!Rezonet.net!nash.pubnix.net!usenet
From: Mark Hillier <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: 2 Mbit/sec 10GHz Microwave link
Date: 3 Aug 1995 02:03:54 GMT
Organization: PubNIX Montreal
Lines: 9
Distribution: inet
Message-ID: <3vpaqa$[e-mail]>
NNTP-Posting-Host: port95.pubnix.net

I am interested in the article in the 1990, 1991 ARRL Handbooks about a 10GHz high-speed data link.
The Handbook mentions that the original article appears in the December 1989 issue of
Ham Radio Magazine.

Does anyone know where I might be able to get a copy of that article ?

Thanks,

Mark VE2HVW


From [e-mail] Fri Aug 04 16:48:57 1995
Path: grape.epix.net!sc2c526a.ra.osd.mil!nova.sti.nasa.gov!lerc.nasa.gov!magnus.acs.ohio-state.edu!math.ohio-state.edu!howland.reston.ans.net!newsfeed.internetmci.com!news.dacom.co.kr!news.netins.net!usenet
From: [e-mail] (TKC)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Longwave Transmitter
Date: Thu, 03 Aug 1995 02:45:32 GMT
Organization: INS Information Services, Des Moines, Iowa, USA
Lines: 20
Message-ID: <3vpd7v$[e-mail]>
References: <3vovg7$[e-mail]>
NNTP-Posting-Host: s2236.netins.net
X-Newsreader: Forte Agent .99.82

[e-mail] (PFZouave) wrote:

:>It was my understanding that some segment of the longwave band had been
:>set aside for license-free experimentation, provided you stayed under a
:>certain power level. In fact, I have vague memories of an article for such
:>a transmitter in a back issue of Radio Electronics (or some similar
:>magazine).

:>Does any one know the rules regarding longwave experimentation? Is there a
:>web site for this sort of data? Please email any responses.
:>[e-mail]
:>Pete Friedrichs
:>*** Common Sense Is Not That Common ***

Can't remember the freq.  but the power was 100 mw with I think 50 ft
antenna...
The saving thing was that you have no restrictions on the receiving
ant..   Make it BIG   :)
************   TKC   ************



From [e-mail] Fri Aug 04 16:49:00 1995
Newsgroups: rec.radio.amateur.homebrew
Path: grape.epix.net!sc2c526a.ra.osd.mil!nova.sti.nasa.gov!lerc.nasa.gov!magnus.acs.ohio-state.edu!math.ohio-state.edu!news.cyberstore.ca!vanbc.wimsey.com!unixg.ubc.ca!info.ucla.edu!news.ucdavis.edu!csus.edu!netcom.com!dick
From: [e-mail] (Richard Arnold)
Subject: coil winding program
Message-ID: <[e-mail]>
Organization: NETCOM On-line Communication Services (408 261-4700 guest)
Date: Thu, 3 Aug 1995 04:37:37 GMT
Lines: 123
Sender: [e-mail]


Here is a simple C program I  threw together a few years back to save
me the trouble of iterative calculations on a hand calculator. What else
is a computer good for? I also bemoan the fact that very few programs
are posted for the unix environment, so here is a little contribution.
I hope this saves at least one coil-winder a little time...


/*

A simple coil calculation program based on the inductance formula
presented in the ARRL Handbook for many years. Artlessly coded by
Dick Arnold, W5VEC.

This program was written on a Sun workstation and compiles and runs
on SunOS 3.5 thru 4.1.3. Hopefully Solaris as well.

Close-wound single-layer coil calculation. To use, simply compile and
run. It's interactive, asking for wire gage if known, and target
inductance. It overshoots the target by one turn. You can fix this if
you want (what's a turn between friends?).

Totally standard disclaimers: not to be used in life-support systems,
military or other applications where loss of life may be incurred.
Change at will; don't ask for help -- I left customer support some
time ago...

*/

#include        <stdio.h>

FILE    *wfd;

char    wfile[80] = {"coil.tmp"};  /* don't ya just hate hard coded stuff? */

main()

{
        float   dia, tgt, len;
        float   r,n,l;
        int     nmax, gauge, eflag;

/*      get the variables       */

        eflag = 0;
        printf("\nCoil Calculation Program\n\n");
        printf("Enter:\n");
        printf("   wire gauge: ");
        scanf("%d",&gauge);
        switch (gauge){
                case 8:         dia = 0.1285; break;
                case 9:         dia = 0.1144; break;
                case 10:        dia = 0.1019; break;
                case 11:        dia = 0.0907; break;
                case 12:        dia = 0.0808; break;
                case 13:        dia = 0.0719; break;
                case 14:        dia = 0.0640; break;
                case 15:        dia = 0.0571; break;
                case 16:        dia = 0.0508; break;
                case 17:        dia = 0.0453; break;
                case 18:        dia = 0.0403; break;
                case 19:        dia = 0.0363; break;
                case 20:        dia = 0.0320; break;
                case 21:        dia = 0.0285; break;
                case 22:        dia = 0.0254; break;
                case 23:        dia = 0.0226; break;
                case 24:        dia = 0.0201; break;
                case 25:        dia = 0.0179; break;
                case 26:        dia = 0.0159; break;
                case 27:        dia = 0.0142; break;
                case 28:        dia = 0.0126; break;
                case 29:        dia = 0.0113; break;
                case 30:        dia = 0.0100; break;
                default:        printf("Not in wire table\n");eflag = 1;
                }
        if(eflag == 1){
                printf("   diameter of wire,inches: ");
                scanf("%f",&dia);
                }
        printf("   target inductance, microhenries: ");
        scanf("%f",&tgt);
        printf("   coil radius, inches: ");
        scanf("%f",&r);
        printf("\n");
        wfd = fopen(wfile,"w");
        fprintf(wfd,"radius is %.2f  wire dia = %.4f",r,dia);
        if(eflag == 0)
                fprintf(wfd,"  gauge = %d\n",gauge);
        else
                fprintf(wfd,"\n");

/*      compute here    */

        nmax = 3000;
        n = 0;
        len=(dia*n);
        l = ((r*n)*(r*n)) / (9*r + 10*len);

        fprintf(wfd,"turns\t\tinductance\n");
        while (tgt > l) {

                n++;
                len = (dia * n);
                l = ((r*n)*(r*n)) / (9*r + 10*len);
                fprintf(wfd,"%.0f\t\t%.2f\n",n,l);
                if (n >= nmax) {
                        break;
                }
        }

        if (n < nmax) {
                printf("------------------------------------------------\n");
                printf("number of turns:\t%.0f\n",n);
                printf("inductance:\t\t%.2f microhenries\n",l);
                printf("coil length:\t\t%.2f inches\n\n",len);
        }
        else
                printf("** values given are impractical **\n\n");

        fclose(wfd);
        exit(0);
}



From [e-mail] Fri Aug 04 16:49:01 1995
Path: grape.epix.net!sc2c526a.ra.osd.mil!nova.sti.nasa.gov!lerc.nasa.gov!magnus.acs.ohio-state.edu!math.ohio-state.edu!howland.reston.ans.net!news.sprintlink.net!simtel!lll-winken.llnl.gov!venus.sun.com!news2me.EBay.Sun.COM!centralnews1.Central.Sun.COM!newsworthy.West.Sun.COM!abyss.West.Sun.COM!myers
From: [e-mail] (Dana Myers)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Longwave Transmitter
Date: 3 Aug 1995 06:24:11 GMT
Organization: SunSoft South, Los Angeles, CA
Lines: 30
Message-ID: <3vpq2b$[e-mail]>
References: <3vovg7$[e-mail]> <3vpd7v$[e-mail]>
NNTP-Posting-Host: sunspot.west.sun.com

In article <3vpd7v$[e-mail]>, TKC <[e-mail]> wrote:
>[e-mail] (PFZouave) wrote:
>
>:>It was my understanding that some segment of the longwave band had been
>:>set aside for license-free experimentation, provided you stayed under a
>:>certain power level. In fact, I have vague memories of an article for such
>:>a transmitter in a back issue of Radio Electronics (or some similar
>:>magazine).
>
>:>Does any one know the rules regarding longwave experimentation? Is there a
>:>web site for this sort of data? Please email any responses.
>:>[e-mail]
>:>Pete Friedrichs
>:>*** Common Sense Is Not That Common ***
>
>Can't remember the freq.  but the power was 100 mw with I think 50 ft
>antenna...

Actually, the answer is 170-190KHz, maximum of 1W PA input, 15m
total length of antenna, feedline and grounding system.

>The saving thing was that you have no restrictions on the receiving
>ant..   Make it BIG   :)

Or make it an active loop...

--
 * Dana H. Myers KK6JQ, DoD#: j | Views expressed here are      *
 * [phone]               | mine and do not necessarily   *
 * [e-mail]      | reflect those of my employer  *


From [e-mail] Fri Aug 04 16:49:03 1995
Path: grape.epix.net!sc2c526a.ra.osd.mil!nova.sti.nasa.gov!lerc.nasa.gov!magnus.acs.ohio-state.edu!math.ohio-state.edu!howland.reston.ans.net!agate!!tvr
From: [e-mail] (Tovar)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Longwave Transmitter ['lowfer' band]
Date: 03 Aug 1995 07:09:12 GMT
Organization: CNMAT
Lines: 88
Message-ID: <[e-mail]>
References: <3vovg7$[e-mail]> <3vpd7v$[e-mail]>
NNTP-Posting-Host: les.cnmat.berkeley.edu
In-reply-to: [e-mail]'s message of Thu, 03 Aug 1995 02:45:32 GMT

   [e-mail] (PFZouave) wrote:

   :>It was my understanding that some segment of the longwave band had been
   :>set aside for license-free experimentation, provided you stayed under a
   :>certain power level. In fact, I have vague memories of an article for such
   :>a transmitter in a back issue of Radio Electronics (or some similar
   :>magazine).

   :>Does any one know the rules regarding longwave experimentation? Is there a
   :>web site for this sort of data? Please email any responses.
   :>[e-mail]
   :>Pete Friedrichs
   :>*** Common Sense Is Not That Common ***

   Can't remember the freq.  but the power was 100 mw with I think 50 ft
   antenna...
   The saving thing was that you have no restrictions on the receiving
   ant..   Make it BIG   :)
   ************   TKC   ************

My recent poking around the Internet has let me to conclude that 1750 meters
is governed by Part 15:

    Sec. 15.217 Operation in the band 160-190 kHz.

      (a) The total input power to the final radio frequency stage
    (exclusive of filament or heater power) shall not exceed one watt.
      (b) The total length of the transmission line, antenna, and
    ground lead (if used) shall not exceed 15 meters.
      (c) All emissions below 160 kHz or above 190 kHz shall be
    attenuated at least 20 dB below the level of the unmodulated
    carrier.  Determination of compliance with the 20 dB attenuation
    specification may be based on measurements at the intentional
    radiator's antenna output terminal unless the intentional radiator
    uses a permanently attached antenna, in which case compliance shall
    be demonstrated by measuring the radiated emissions.

and that experimenters like ourselves are governed by:

    Sec. 15.23 Home-built devices.

      (a) Equipment authorization is not required for devices that are
    not marketed, are not constructed from a kit, and are built in
    quantities of five or less for personal use.
      (b) It is recognized that the individual builder of home-built
    equipment may not possess the means to perform the measurements for
    determining compliance with the regulations.  In this case, the
    builder is expected to employ good engineering practices to meet
    the specified technical standards to the greatest extent
    practicable.  The provisions of Sec. 15.5 apply to this equipment.

and the relevant part of that section reads:

    Sec. 15.5 General conditions of operation.
                ...
      (b) Operation of an intentional, unintentional, or incidental
    radiator is subject to the conditions that no harmful interference
    is caused and that interference must be accepted that may be caused
    by the operation of an authorized radio station, by another
    intentional or unintentional radiator, by industrial, scientific
    and medical (ISM) equipment, or by an incidental radiator.
      (c) The operator of a radio frequency device shall be required to
    cease operating the device upon notification by a Commission
    representative that the device is causing harmful interference.
    Operation shall not resume until the condition causing the harmful
    interference has been corrected.
                ...

According to Part 15, we are talking about intentional radiators, and
of course, you want to cease operating before 15.5(c) applies.  Note also
that Part 15 doesn't talk about receiving antennas; that's a matter
between you and your local zoning authority...

Please see:

         ftp://ftp.cs.buffalo.edu/pub/ham-radio/1750m.band

for further details, including an organization and journal for the  'lowfer'.

Part 15 is available from The U.S. House of Representatives Internet Law
Library Code of Federal Regulations [http://www.pls.com:8001/his/cfr.html
ask if you need help searching it].
                                                -- KD6PAG

P.S.  I'd be interested in hearing from any S.F. Bay Area lowfer's, if
there are any around who might help me get started.  Anyone know which
issue of "73" or "QST" had the 'lowfer' project in the past few years?
I misplaced my copy.


From [e-mail] Fri Aug 04 16:49:04 1995
Path: grape.epix.net!news.sprintlink.net!news.gate.net!not-for-mail
From: [e-mail] (Rick Harrison)
Newsgroups: alt.radio.pirate,sci.electronics,rec.radio.amateur.homebrew
Subject: Re: Anyone use and/or like the Ramsey TV-6 transmitter?
Date: 3 Aug 1995 07:50:04 -0400
Organization: Cybergate, Inc.
Lines: 8
Message-ID: <3vqd5c$[e-mail]>
References: <3vp73l$[e-mail]>
NNTP-Posting-Host: navajo.gate.net
Xref: grape.epix.net alt.radio.pirate:9434 sci.electronics:138105 rec.radio.amateur.homebrew:8704

There are better TV transmitter kits on the market.  Read the Low
Power Broadcasting FAQ on alt.radio.pirate, or send me an e-mail
request for it and I will mail it to you.



--
Rick Harrison ([e-mail])         PO Box 54-7014, Orlando FL 32854 USA


From [e-mail] Fri Aug 04 16:49:04 1995
Path: grape.epix.net!sc2c526a.ra.osd.mil!nova.sti.nasa.gov!lerc.nasa.gov!magnus.acs.ohio-state.edu!math.ohio-state.edu!howland.reston.ans.net!ix.netcom.com!netnews
From: [e-mail] (Ted Viens)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Looking for source of toroid cores & ferrite beads
Date: 3 Aug 1995 08:41:08 GMT
Organization: Netcom
Lines: 31
Distribution: world
Message-ID: <3vq234$[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: ix-hou5-15.ix.netcom.com

In <[e-mail]> [e-mail] (Herb Rosenberg) writes:
>
>I am on amajor crusade to eliminate rfi coming from my computers that is
>getting into the HF rigs.  I am looking for a good source of toroid
>beads, snap on chokes, and ferrite cores for fighting this stuff.
>
>I have some information on Palomar Engineering, and Radio Shack, but
>there products seem to be over priced (I think).
>
>Does anyone out there know of any good sources for these types of
>products with really good pricing?
>
>Any help would be appreaciated.
>
>Thanks.
>
>--
>[e-mail]

Surplus stores, Herb, surplus stores.  I have bought small bags of
large ferrite potting bobbins at surplus stores here in Houston at
prices from .25 to 1.25 each.  Probably 10 cents on the dollar or
better.  Then I put a small loop in the power cord or computer cable
and push it over the core of the bobbin.  I may tape a ferrite bar over
the open end.  Works fairly well.  If you don't have a good selection
in a local electronics surplus store, buy a couple of electronic
hobbyist magazines and check the adds for the mail order surplus stores
such as Allright and All Electronics etc., etc...
--
Bye...  Ted..
Deep in the Heart of the Armpits of Houston, Texas...


From [e-mail] Fri Aug 04 16:49:05 1995
Path: grape.epix.net!sc2c526a.ra.osd.mil!nova.sti.nasa.gov!lerc.nasa.gov!magnus.acs.ohio-state.edu!freenet.columbus.oh.us!pacific.mps.ohio-state.edu!math.ohio-state.edu!howland.reston.ans.net!news1.digex.net!news3.digex.net!digex.net!not-for-mail
From: [e-mail] (Gary Chatters)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: VARIALBE DC POWER SUPPLY
Date: 3 Aug 1995 10:15:14 -0400
Organization: Universal Access by Digital Express. 800-969-9090
Lines: 20
Message-ID: <3vqlli$[e-mail]>
References: <3v3321$[e-mail]>
NNTP-Posting-Host: universe.digex.net
Summary: consider heat dissipation in design
Keywords: power heat heatsink

In article <3v3321$[e-mail]>, JOHNSON <[e-mail]> wrote:
>I'd like to build a low-cost variable DC power supply that would produce
>4-40 volts DC at about 2amps. Could anyone help me with this project?
>

When designing your power supply you must consider power dissipation
requirements.  Voltage regulator ICs are quite easy to use,
but you must consider voltage and current AND power dissipation limits.

For your requirements ( 4-40 VDC at 2 amps), suppose that the
voltage input to the regulator is 42 volts.  Then the worst case
for power dissipation is (42 - 4 ) * 2 = 76 watts.  That is a lot
of power to dissipate in a TO-3 case and will require a large heat
sink.  I don't have my databooks here, so I am not sure that many
regulator ICs can even handle that much power.

Many regulator ICs are capable of shutting down in case of thermal
overload, but external pass transistors aren't that smart.

gc


From [e-mail] Fri Aug 04 16:49:06 1995
Path: grape.epix.net!sc2c526a.ra.osd.mil!nova.sti.nasa.gov!lerc.nasa.gov!magnus.acs.ohio-state.edu!math.ohio-state.edu!howland.reston.ans.net!newsfeed.internetmci.com!psgrain!nntp.teleport.com!teleport.com!radio
From: [e-mail] (FBenterprises)
Newsgroups: rec.radio.amateur.homebrew
Subject: FBenterprises Web Page
Date: Thu, 3 Aug 1995 12:07:46
Organization: FBenterprises
Lines: 14
Message-ID: <[e-mail]>
NNTP-Posting-Host: ip-vanc2-27.teleport.com
X-Newsreader: Trumpet for Windows [Version 1.0 Rev A]

Just a quick announcement of FBenterprises new Web Page.  FBenterprises sells
Amateur Radio Publications, including Repeater Maps, and the full line of ARRL
Publications (at a DISCOUNT!).

The URL for the page is:

http://www.teleport.com/~radio/ham.html

Thank you!

73!

Bob Martin N7JXN
FBenterprises


From [e-mail] Fri Aug 04 16:49:07 1995
Path: grape.epix.net!news.sprintlink.net!howland.reston.ans.net!swrinde!news.uh.edu!news.sccsi.com!nuchat!academia!john.dilks
From: [e-mail] (John Dilks)
Newsgroups: rec.radio.amateur.homebrew
Subject: HF amp 4CX1000A help
Message-ID: <[e-mail]>
Date: 3 Aug 95 13:15:00 GMT
Distribution: world
Organization: ACADEMIA BBS - Northfield, NJ - 609-383-9400
Reply-To: [e-mail] (John Dilks)
References: <3v1ili$[e-mail]>
Lines: 16

Gerald Caouette asks:

-> Am looking to home build a single tube 4CX1000A 160 - 6 Meter
-> amplifier:

Gerald,
Your amp is in some of the older ARRL Handbooks, as I remember.  I
have a number of them.  If you don't get help from others, send me some
mail and I'll spend some time looking through them and I'll photocopy
the article for you.  But you might be better-off asking around your
area for some of the older copies from your friends.  You need to read
more about amps if you are planning on building one.  There is much to
learn!  ....>>> Be Careful! <<<....

73', John Dilks, K2TQN:::::  [e-mail]



From [e-mail] Fri Aug 04 16:49:07 1995
Path: grape.epix.net!news.sprintlink.net!howland.reston.ans.net!math.ohio-state.edu!news.cyberstore.ca!vanbc.wimsey.com!unixg.ubc.ca!info.ucla.edu!library.ucla.edu!ihnp4.ucsd.edu!news1.ucsd.edu!news-mail-gateway
From: [e-mail] (Pat Taber)
Newsgroups: rec.radio.amateur.homebrew
Subject: August QST CMOS keyer
Date: 3 Aug 95 14:43:56 GMT
Organization: ucsd usenet gateway
Lines: 24
Message-ID: <[e-mail]>
NNTP-Posting-Host: ucsd.edu
Originator: [e-mail]

     I guess I have a hard time seeing the difference between a
     construction article that specs a Curtis keyer chip and one that specs
     a preprogrammed microcontroller. You have to buy it from a single
     source and you don't get to know what goes into that one part of the
     project. I don't see that as invalidating the actual constuction
     involved or make the article less "pure" than any other.

     So the guy who makes the chip tells you how to use it. Big deal. We
     should be so unlucky as to have the makers of other devices provide
     simple projects that use them. What if Motorolla were to slip in an
     article on how to use their power transistors? Or if TI were to sneak
     in an easy DSP project? WHAT A NIGHTMARE! We Gotta stop this! We gotta
     write to our Drictors and ARRL HQ and prevent this!

     On the other hand, if I developed the code for a project like this, I
     wouldn't publish it either. Not just for the millions and billions of
     dollars I'd make selling the part to helpless little hams, but because
     then I'd be limiting the complexity of the project and thus the
     support problems.

     Stop those useful articles now!

     >>>==>PStJTT



From [e-mail] Fri Aug 04 16:49:08 1995
Path: grape.epix.net!news.sprintlink.net!newsfeed.internetmci.com!solaris.cc.vt.edu!mkeitz
From: [e-mail] (Mike Keitz)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: VARIALBE DC POWER SUPPLY
Date: Thu, 03 Aug 95 14:48:12 GMT
Organization: TSE Systems
Lines: 43
Message-ID: <3vqnm3$[e-mail]>
References: <3v3321$[e-mail]> <3vqlli$[e-mail]>
NNTP-Posting-Host: mkeitz.beve.blacksburg.va.us
Keywords: power heat heatsink
X-Newsreader: News Xpress Version 1.0 Beta #4

In article <3vqlli$[e-mail]>,
   [e-mail] (Gary Chatters) wrote:
>In article <3v3321$[e-mail]>, JOHNSON <[e-mail]>
wrote:
>>I'd like to build a low-cost variable DC power supply that would produce
>>4-40 volts DC at about 2amps. Could anyone help me with this project?
>>
>
>When designing your power supply you must consider power dissipation
>requirements.  Voltage regulator ICs are quite easy to use,
>but you must consider voltage and current AND power dissipation limits.
>
>For your requirements ( 4-40 VDC at 2 amps), suppose that the
>voltage input to the regulator is 42 volts.  Then the worst case
>for power dissipation is (42 - 4 ) * 2 = 76 watts.  That is a lot
>of power to dissipate in a TO-3 case and will require a large heat
>sink.  I don't have my databooks here, so I am not sure that many
>regulator ICs can even handle that much power.
>
>Many regulator ICs are capable of shutting down in case of thermal
>overload, but external pass transistors aren't that smart.

If a wide range is desired, the series regulator dissipation problem is
often solved by making the input voltage to the regulator change according
to the aproximate output desired.  This is most often done by changing taps
on the 60Hz transformer that feeds the rectifier/filter at the input to the
regulator section.  The supply would then have at least two ranges: "high",
which applies about 42V to the input of the regulator, and "low" using
about 21V.  The switch that selects the transformer tap would also select
part of the feedback resistor so the output voltage is only adjustable to
values apropriate for that range (4-19V Low, 19-40V High).  Automatic
selection could also be implemented, using a relay and a voltage comparator
on the output.  This has the additional advantage of returning to "low"
input when the output is overloaded.

Worst case dissipation would occur when the lowest setting of the high
range is used, for example 19V.  Then you have 2*(42-19) = 46W, which is a
considerable improvement, and probably low enough to use the regulator
alone with a good heat sink but with no need for a pass transistor.  In
case of a shorted output on the high range, the regulator could overheat,
but its internal protection would prevent damage.

-Mike KD4QDM


From [e-mail] Fri Aug 04 16:49:10 1995
Path: grape.epix.net!sc2c526a.ra.osd.mil!nova.sti.nasa.gov!lerc.nasa.gov!magnus.acs.ohio-state.edu!freenet.columbus.oh.us!pacific.mps.ohio-state.edu!math.ohio-state.edu!cs.utexas.edu!swrinde!ihnp4.ucsd.edu!news1.ucsd.edu!news-mail-gateway
From: [e-mail] (Wilson-Smillie, Kimberley: IMB)
Newsgroups: rec.radio.amateur.homebrew
Subject: Internet address
Date: 3 Aug 95 16:21:00 GMT
Organization: ucsd usenet gateway
Lines: 44
Message-ID: <[e-mail]>
NNTP-Posting-Host: ucsd.edu
Originator: [e-mail]


We do not have a valid internet address at Industry Canada for Tony
Komljanec.

Thank you
Kimberley Wilson-Smillie
Corporate E-Mail Services
Industry Canada

 ----------
From: Mailer-Daemon
To: Postmaster
Subject: Returned mail: User unknown
Date: Wednesday, August 02, 1995 9:58AM

   ----- Transcript of session follows -----
<<< HELO mail.ucsd.edu
<<< MAIL From:<[e-mail]>
<<< RCPT To:<[e-mail]>
550 <[e-mail]>... User unknown
<<< DATA

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From [e-mail] Fri Aug 04 16:49:10 1995
Path: grape.epix.net!sc2c526a.ra.osd.mil!nova.sti.nasa.gov!lerc.nasa.gov!magnus.acs.ohio-state.edu!math.ohio-state.edu!howland.reston.ans.net!vixen.cso.uiuc.edu!uchinews!ncar!noao!CS.Arizona.EDU!news.Arizona.EDU!usenet
From: [e-mail] (Joseph M. Miller, M.D.)
Newsgroups: rec.radio.amateur.homebrew
Subject: ATV newsgroup
Date: Thu, 03 Aug 95 16:22:02 MST
Organization: Dept. of Ophthalmology, University of Arizona
Lines: 4
Message-ID: <3vrlq8$[e-mail]>
NNTP-Posting-Host: mred.eyes.arizona.edu
Mime-Version: 1.0
X-Newsreader: WinVN 0.93.6

Is there a newsgroup where ATV is discussed?  Can't seem to find one.
Tnx
joe KI7WV



From [e-mail] Fri Aug 04 16:49:11 1995
Path: grape.epix.net!sc2c526a.ra.osd.mil!nova.sti.nasa.gov!lerc.nasa.gov!magnus.acs.ohio-state.edu!math.ohio-state.edu!howland.reston.ans.net!vixen.cso.uiuc.edu!uchinews!ncar!noao!CS.Arizona.EDU!news.Arizona.EDU!usenet
From: [e-mail] (Joseph M. Miller, M.D.)
Newsgroups: rec.radio.amateur.homebrew
Subject: ATV Newsgroup
Date: Thu, 03 Aug 95 16:23:42 MST
Organization: Dept. of Ophthalmology, University of Arizona
Lines: 4
Message-ID: <3vrlt8$[e-mail]>
NNTP-Posting-Host: mred.eyes.arizona.edu
Mime-Version: 1.0
X-Newsreader: WinVN 0.93.6

Is there an ATV newsgroup being discussed?

Joe KI7WV



From [e-mail] Fri Aug 04 16:49:11 1995
Path: grape.epix.net!sc2c526a.ra.osd.mil!nova.sti.nasa.gov!lerc.nasa.gov!magnus.acs.ohio-state.edu!math.ohio-state.edu!howland.reston.ans.net!vixen.cso.uiuc.edu!uchinews!ncar!noao!CS.Arizona.EDU!news.Arizona.EDU!usenet
From: [e-mail] (Joseph M. Miller, M.D.)
Newsgroups: rec.radio.amateur.homebrew
Subject: ATV Newsgroup
Date: Thu, 03 Aug 95 16:24:38 MST
Organization: Dept. of Ophthalmology, University of Arizona
Lines: 4
Message-ID: <3vrluo$[e-mail]>
NNTP-Posting-Host: mred.eyes.arizona.edu
Mime-Version: 1.0
X-Newsreader: WinVN 0.93.6

Is there an ATV newsgroup being discussed?

Joe KI7WV



From [e-mail] Fri Aug 04 16:49:12 1995
Path: grape.epix.net!news.sprintlink.net!gatech!swrinde!sgigate.sgi.com!genmagic!bug.rahul.net!a2i!news.erinet.com!pagesat.net!a3bsrv.nai.net!mgate.arrl.org!mgate.arrl.org!not-for-mail
From: [e-mail] (Mike Tracy)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Need Cardwell Condensor Co. info
Date: 3 Aug 1995 16:47:18 -0400
Organization: American Radio Relay League
Lines: 23
Message-ID: <3vrckm$[e-mail]>
References: <3vp296$[e-mail]>
NNTP-Posting-Host: mgate.arrl.org
X-Newsreader: TIN [version 1.2 PL2]

Sergei Kulyov ([e-mail]) wrote:

: Hi gang,

: I'm looking for the address or fax of Cardwell Condensor Co.
: which produced air vary capacitors.

: 73! Sergei
: AA8OT, UA3AP

Cardwell Condenser Corporation
80 East Montauk Highway
Lindenhurst, Long Island, NY 11757

Phone: [phone]
Fax: [phone]

Best Regards, Michael Tracy, KC1SX, ARRL Technical Information Services
-------------------------------------------------------------------------
American Radio Relay League, Inc.     Tel: [phone]
225 Main Street                       Fax: [phone]
Newington, CT 06111                   Email: [e-mail]
-------------------------------------------------------------------------


From [e-mail] Fri Aug 04 16:49:13 1995
Path: grape.epix.net!news.sprintlink.net!newsfeed.internetmci.com!news.dacom.co.kr!news.netins.net!news.netins.net!negaard
From: [e-mail] (David Negaard (Oberon-))
Newsgroups: rec.radio.amateur.homebrew
Subject: Optoisolator cross-reference help and PAL programming information
Date: 03 Aug 1995 17:26:25 GMT
Organization: INS Info Services, Des Moines, Iowa, USA
Lines: 24
Distribution: world
Message-ID: <[e-mail]>
NNTP-Posting-Host: draagen.graceland.edu

I'm working on building the OptoSCC card designed by Henk Penk,
PA0HZP, and intended for use with a variety of digital-mode modems.
I've got the schematic, and I've located all the parts I need except
for the optoisolator chip.  It's specified in the bill of materials as
a PC847, and I can't find this chip or an equivalent.  I've e-mailed
PA0HZP, but he may not be able to respond for any of a variety of
reasons, so I'll try here.  Can anyone help?

The other part of the project that's missing is the PAL used to decode
the PC bus logic.  It's a 20L10 and I can get the part, but I don't
know how to program it.  Maybe I'm confused, but one must program
Programmable Array Logic, mustn't one?

I expect that I could figure what the program ought to be, given
enough time and energy, but I thought I'd pursue a solution with those
wiser, first (I hope you're all wiser than me, else the state of
homebrew may be serious  ;->=  ).

Is there any help available for me out there?
--
o David Negaard                   o [e-mail]
o Help Desk Technician            o http://www.graceland.edu/~negaard
o 700 College Avenue              o linux-phile
o Lamoni, IA  50140               o 73 de KB0PXK


From [e-mail] Fri Aug 04 16:49:14 1995
Path: grape.epix.net!news.sprintlink.net!uunet!in1.uu.net!DIALix!not-for-mail
From: [e-mail] (David Brooks)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Dipper
Date: 3 Aug 1995 18:04:38 +0800
Organization: DIALix Services, Perth, Australia.
Lines: 45
Sender: [e-mail]
Message-ID: <3vq6vm$56v$[e-mail]>
References: <[e-mail]> <[e-mail]>
NNTP-Posting-Host: [e-mail]

Leon Heller <[e-mail]> writes:

>In article <[e-mail]>
>           [e-mail] "Ted Kell" writes:

>> Saturday, at a local Hamfest/fleamarket I purchased a dipper.  This thing
>> is old, the markings on the box mention a frequency range of 400 Kcps to
>> 280Mcps.  It appears to have had a number of owners, one in Beaumont, TX
>> and a another with a VK call that are obvious.  It still works tho, and
>> still has all of its coils.  I have a couple of questions about its use.
>> I know about the use of a dipper to check the resonant frequency of L-C
>> circuits.  I also know about using one as frequency source.  What other
>> neat uses of a dipmeter are there?  Also, this unit has a place for audio
>> out.  It came with an earplug, It may be dead, but the jack is still
>> live.  What is the audio out for?

>With the dipper power off, they can often be used as a wavemeter. The audio
>out might be from an RF detector, so you can hear the modulation when using
>it as a wavemeter.

>Leon
>--
>Leon Heller, G1HSM                | "Do not adjust your mind, there is
>E-mail [e-mail]  |  a fault in reality": on a wall
>Phone: [phone]         |  many years ago in Oxford.

Couple of points more...
1. The dipper can function as a rather rough super-regenerative receiver
   using that audio output (there's no regen control - I did write "rough" :)
2. On my dipper at least, the frequency calibration changes slightly
   between used powered, as an oscillator, and un-powered, as an absorption
   wavemeter. The scale is calibrated as an oscillator.

But I still reckon they're an excellent thing to have around: not the
last word in accuracy (tune up your unknown circuit with the dipper
oscillating, then bring in the dipper on your main receiver to measure
the frequency exactly), but you can do a great deal with them, and they're
cheap. A lot of "bang for your buck".


--
David R. Brooks <[e-mail]>    Tel/fax. [phone]
"Government is not reason. It is not eloquence. It is a force.
Like fire, a dangerous servant and a fearful master." - G. Washington



From [e-mail] Fri Aug 04 16:49:15 1995
Path: grape.epix.net!news.sprintlink.net!EU.net!uknet!SoNet!news
From: Robert Clegg <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Radio Module Required
Date: 3 Aug 1995 18:31:50 GMT
Organization: SoNet - The first Internet provider on the south coast
Lines: 5
Message-ID: <3vr4mm$[e-mail]>
NNTP-Posting-Host: castle.aladdin.co.uk

Wanted:  M57737 P.A. Module for Yaesu FT-720R
This is also used as a 25w P.A. For a lot of marine VHF tx/rx's
Reply to [e-mail]
Cash Waiting.



From [e-mail] Fri Aug 04 16:49:15 1995
Path: grape.epix.net!news.sprintlink.net!howland.reston.ans.net!EU.net!uknet!SoNet!news
From: Robert Clegg <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Tranciever Wanted
Date: 3 Aug 1995 18:34:32 GMT
Organization: SoNet - The first Internet provider on the south coast
Lines: 5
Message-ID: <3vr4ro$[e-mail]>
NNTP-Posting-Host: castle.aladdin.co.uk

Urgently required, 2 metre/70cms dual band tranciever.
NOT Handheld.
Also
2 metre radio with SSB & minimum 25Watts RMS.
Reply to [e-mail]


From [e-mail] Fri Aug 04 16:49:16 1995
Newsgroups: rec.radio.amateur.homebrew
Path: grape.epix.net!news.sprintlink.net!howland.reston.ans.net!swrinde!sdd.hp.com!hp-pcd!hpcvsnz!tomb
From: [e-mail] (Tom Bruhns)
Subject: Wire formulas
Sender: [e-mail] (News )
Message-ID: <[e-mail]>
Date: Thu, 3 Aug 1995 18:56:54 GMT
Nntp-Posting-Host: hplsnb.lsid.hp.com
Organization: Hewlett-Packard
X-Newsreader: TIN [version 1.1 PL9.4]
Lines: 33

Thanks to Richard Arnold for posting the c program to help figure coil
winding info.  I noted he used a case statement to access tabular wire
info.  Here are a couple formulas that folk might find useful to calculate
wire diameter and approximate resistance in ohms per 1000 feet at 20C,
as an alternative to entering a table.

The diameter formula is accurate to better than 0.1% (I doubt that
manufacturing tolerances are ever this good), and the resistance
error, a couple percent max for gauges from 0 to 30 or so, is about
the same as a 5 degree C change in temperature (and it's almost dead
on at 12 gauge), so should be fine for practical work.


    d = 10^(-.05035*g - 0.4884)

    r1000 = 10^(0.1*g - 1)

where

    d = wire diameter in inches

    r1000 = resistance of 1000 feet of wire at 20C, in ohms

    g = AWG gauge number, from 0 to 40.  You can substitute
        -1 for 00, -2 for 000, etc., to extend to even larger
        diameters.  (I guess they might even be fine for gauges
        finer than 40, but the table in front of me doesn't go
        that fine.)

(It always amazes me how simple the constants in the R1000 formula are!)

73, K7ITM



From [e-mail] Fri Aug 04 16:49:17 1995
Path: grape.epix.net!news.sprintlink.net!sunic!sunic.sunet.se!news.funet.fi!news.csc.fi!vyh.fi!raateland
From: [e-mail] (Arjen Raateland)
Newsgroups: rec.radio.amateur.homebrew
Subject: August QST construction article wanted
Date: 3 Aug 95 22:14:24 EET
Organization: National Board of Waters and the Environment
Lines: 28
Message-ID: <[e-mail]>
NNTP-Posting-Host: vyh1.vyh.fi

So there is all this commotion about a construction article in the
August 1995 issue of QST that wasn't a construction article, but read
this:

I don't get QST, but today I received an IDIOM Press Super CMOS Keyer
III that I ordered after I read about it on the QRP-L list. Guess
what, the Tutorial/Operating manual refers to 'the construction
article', but all that is included in the manual is the schematic, no
details about construction.

Well, having some experience with these kind of things, I don't expect
much difficulty in putting the thing together, but if anybody has
actually read the 'construction article' and found interesting details
that would be good to be aware of before connecting the PC-board to
anything else, I would very much like to know. I'm also interested to
know what there is in the QST article about the workings of the keyer.

I have the 1994 ARRL Handbook, wherein there is a description
(construction article?) of the CMOS Super Keyer II.

The local public library doesn't have QST, so I can't have a look
at the article myself.

--... ...-- -.. . --- .... ..--- --.. .- --..
Arjen Raateland, SAS Support
Finnish Environment Agency
Helsinki, Finland
.-.-. -.-


From [e-mail] Fri Aug 04 16:49:18 1995
Path: grape.epix.net!sc2c526a.ra.osd.mil!nova.sti.nasa.gov!lerc.nasa.gov!magnus.acs.ohio-state.edu!math.ohio-state.edu!howland.reston.ans.net!swrinde!sdd.hp.com!night.primate.wisc.edu!newsspool.doit.wisc.edu!koala.uwec.edu!usenet
From: dan drumm <drumm>
Newsgroups: rec.radio.amateur.equipment,rec.radio.amateur.misc,rec.radio.amateur.homebrew
Subject: Dentron tuner (instruction / pay too much?)
Date: 3 Aug 1995 22:31:10 GMT
Organization: University of Wisconsin Eau Claire
Lines: 30
Message-ID: <3vrine$[e-mail]>
NNTP-Posting-Host: lilith.uwec.edu
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 1.1N (X11; I; OSF1 V3.2 alpha)
To: [e-mail]
X-URL: news:rec.radio.amateur.equipment
Xref: grape.epix.net rec.radio.amateur.equipment:15381 rec.radio.amateur.misc:84293 rec.radio.amateur.homebrew:8715

I bought a Dentron (model <something> jr.) antenna tuner for $30.00 US.
at a hamfest.  Did I pay too much?

I was going to use it with a heath HW100, -- now I know I also need
an swr meter. oops, here comes yet another purchase.  Nevertheless,
I would gratefully pay cost + postage + thank-you-very-very-much for
the photocoppied manual.


Other than that, I would like to just get a quick overview on how to
get up and running with the thing.  It has one meter, and two knobs:
(and no instructions):

#1      transmitter match       a,b,c,d,e,f... switch.
#2      antenna match           variable.

The back has tx in, ant out, ballenced out, and unballenced out.


any help greatly appreciated.  If you have the manual, please contact me
at [e-mail].


Thanks!

Dan Drumm
N9VOX

                        Wishing you an extra hour each day!



From [e-mail] Fri Aug 04 16:49:19 1995
Path: grape.epix.net!sc2c526a.ra.osd.mil!nova.sti.nasa.gov!lerc.nasa.gov!magnus.acs.ohio-state.edu!math.ohio-state.edu!howland.reston.ans.net!news-e1a.megaweb.com!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail
From: [e-mail] (Steve6920)
Newsgroups: rec.radio.amateur.equipment,rec.radio.amateur.misc,rec.radio.amateur.homebrew
Subject: Re: Dentron tuner (instruction / pay too much
Date: 3 Aug 1995 22:47:21 -0400
Organization: America Online, Inc. (1-800-827-6364)
Lines: 26
Sender: [e-mail]
Message-ID: <3vs1np$[e-mail]>
References: <3vrine$[e-mail]>
Reply-To: [e-mail] (Steve6920)
NNTP-Posting-Host: newsbf02.mail.aol.com
Xref: grape.epix.net rec.radio.amateur.equipment:15390 rec.radio.amateur.misc:84307 rec.radio.amateur.homebrew:8723

Hi Dan,
  If that is the tuner I am thinking about, it has a meter on the front
which indicates relative power (with a pot on the back to adjust
sensitivity.
  I have used the Dentron tuners for several years (both the Jr. Tuner and
the much larger MT-2000A.  I haven't had one bit of problems with them.
  To operate the tuner, you set the bandswitch and then adjust both the
transmitter and antenna capacitors for the best match.  You can get a
rough idea by adjusting for maximum background receiver noise.  The
settings will obviously change depending on the antenna you are using.
The only rule of thumb is the lower the letter setting on the bandswitch,
the more inductor you are switching in and the lower the operating
frequency.

The is a post on the back for the single wire antenna to which you would
hook a long wire or random wire antenna.  If you are using balanced
feedline, you would put a jumper between the single wire post and one post
of the balanced output. There should be a dotted line on the back
indicating where this jumper should be placed.  In addition, if you are
using the tuner on low frequencies and have a hard time matching the
antenna, you may want to put this jumper in as the addition of the balun
in the circuit will help tune low frequency long wires.
  If you will verifiy you have the Jr. Monitor tuner, I have the manual
and can copy it for you.  You can send me E-mail with an address.
                        73's
                           Steve


From [e-mail] Fri Aug 04 16:49:20 1995
Newsgroups: alt.radio.pirate,sci.electronics,rec.radio.amateur.homebrew
Path: grape.epix.net!sc2c526a.ra.osd.mil!nova.sti.nasa.gov!lerc.nasa.gov!magnus.acs.ohio-state.edu!math.ohio-state.edu!howland.reston.ans.net!gatech!ncar!noao!news.Arizona.EDU!news.Cerritos.edu!nic-nac.CSU.net!charnel.ecst.csuchico.edu!csusac!csus.edu!netcom.com!dilligaf
From: [e-mail] (Jonas Grumby)
Subject: Re: Anyone use and/or like the Ramsey TV-6 transmitter?
Message-ID: <[e-mail]>
Organization: NETCOM On-line Communication Services (408 261-4700 guest)
References: <3vp73l$[e-mail]>
Date: Thu, 3 Aug 1995 23:08:18 GMT
Lines: 26
Sender: [e-mail]
Xref: grape.epix.net alt.radio.pirate:9445 sci.electronics:138216 rec.radio.amateur.homebrew:8727

In article <3vp73l$[e-mail]>, Wyatt Earp <[e-mail]> wrote:
>I bought the Ramsey TV-6 kit and the LPA-1 1 watt amp with the hopes
>of transmitting my cable box / VCR to all the TV's in the house and
>not have to run coax.  The kits went together with no problems, but
>the performance from the TV-6 transmitter is nothing to brag about.  I
>have managed to get a crappy, rolling, wavy black and white picture
>with some audio.  Doesn't matter if I use the TV-6 kit alone with the
>built in whip, an external 'dipole' of (2) 3.5 foot wires, or the
>LPA-1 and the dipole.  It is looking like this will never replace
>running coax to every TV in the house.
>
  <snip>
>Thanks,
>
>Wyatt
>

I've had about the same luck with mine although I have noticed
that some receivers work better than others.  Also, I could
sometimes tune in a decent picture but the audio would be
terrible and vice versa.

Oh well..

Jonas



From [e-mail] Fri Aug 04 16:49:21 1995
Path: grape.epix.net!sc2c526a.ra.osd.mil!nova.sti.nasa.gov!lerc.nasa.gov!magnus.acs.ohio-state.edu!math.ohio-state.edu!howland.reston.ans.net!news.sprintlink.net!holonet!colossus.holonet.net!minfox!jim.horner
From: [e-mail] (Jim Horner)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Longwave Transmitter
Date: Fri,  4 Aug 1995 00:23:00 GMT
Message-ID: <[e-mail]>
Organization: MINFOX Courtenay, BC (604)-337-2023
Distribution: world
References: <3vpd7v$[e-mail]> <3vovg7$[e-mail]>
Lines: 29


TK>[e-mail] (PFZouave) wrote:

TK>:>It was my understanding that some segment of the longwave band had been
TK>:>set aside for license-free experimentation, provided you stayed under a

TK>:>Does any one know the rules regarding longwave experimentation?


From the article "Ground Zero"  (Popular Electronics-Oct.'94):

           1750-Meter Experimenters' Band:
     - 160-190 kHz          - Max. power-1watt
- Max. antenna length-50 ft. including ground lead and transmission line
                     - Modulation-any
- Out of band emissions must be supressed by 20 dB.
 The article suggests the following publication for further info:
         (says it contains equiptment designs)

         LOW and MEDIUM FREQUENCY SCRAPBOOK
    from-Ken Cornell
         225 Baltimore Ave.,             107 pages
         Point Pleasant Beach,           $18.75 first class mail
         NJ 08742
                         haven't seen it myself tho........
                                                      jim

---
 * OLX 2.1 TD * Use the mouse Luke  -Obi Wan Gates-


From [e-mail] Fri Aug 04 16:49:21 1995
Path: grape.epix.net!sc2c526a.ra.osd.mil!nova.sti.nasa.gov!lerc.nasa.gov!magnus.acs.ohio-state.edu!math.ohio-state.edu!howland.reston.ans.net!news-e1a.megaweb.com!newstf01.news.aol.com!uunet!in2.uu.net!vivanews.vivanet.com!mulveyr
From: [e-mail] (Rich Mulvey)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Can Schems/Diags be Posted here? *.uue??
Date: 4 Aug 1995 01:01:19 GMT
Organization: Mulvey
Lines: 19
Message-ID: <3vrrgv$[e-mail]>
References: <3vhpu2$[e-mail]>
Reply-To: [e-mail]
NNTP-Posting-Host: ip140.vivanet.com
X-Newsreader: TIN [version 1.2 PL2]

Anthony G. Catalano ([e-mail]) wrote:
: I wonder If we can post scanned drawings, scematics etc. in this newsgroup?

: I would post them as an attached *.uue file that would have to
: be uue-decoded back into a pcx or a gif file.
: Anthony G. Catalano WW2W

   No, this is a discussion group, and it would be considered rude,
especially since a large number of the people reading the group have to
pay for every byte that passes through their modems.

   The generally approved method is to place the files on a public
FTP site, and post a notice in the relevant group as to its
availability.

   Thank you, however, for asking.  A lot of people wouldn't have gone to
the trouble.  :-)

- Rich


From [e-mail] Fri Aug 04 16:49:22 1995
Path: grape.epix.net!sc2c526a.ra.osd.mil!nova.sti.nasa.gov!lerc.nasa.gov!magnus.acs.ohio-state.edu!math.ohio-state.edu!howland.reston.ans.net!news-e1a.megaweb.com!newstf01.news.aol.com!uunet!in2.uu.net!news.iadfw.net!usenet
From: Gene Mason <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Good SPICE book
Date: 4 Aug 1995 02:03:37 GMT
Organization: Internet America
Lines: 5
Message-ID: <3vrv5p$[e-mail]>
References: <3vopks$[e-mail]>
NNTP-Posting-Host: dal06-04.ppp.iadfw.net
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 1.1N (Windows; I; 32bit)
To: [e-mail]

Hi...Try Borders books at Preston and Royal Ln...Saw several there
recently.Also Book stop at Preston/Forest Ln, although the Book Stop at
Town East has the best selection of technical books in Dallas...And don't
ask me why! Maybe has to do with AT&T being close by. Good Luck... Gene



From [e-mail] Fri Aug 04 16:49:23 1995
Path: grape.epix.net!sc2c526a.ra.osd.mil!nova.sti.nasa.gov!lerc.nasa.gov!magnus.acs.ohio-state.edu!math.ohio-state.edu!howland.reston.ans.net!swrinde!ihnp4.ucsd.edu!news1.ucsd.edu!news-mail-gateway
From: [e-mail] (JOHN DAY)
Newsgroups: rec.radio.amateur.homebrew
Subject: Farnell SSG-2000 - help needed
Date: 4 Aug 95 03:02:46 GMT
Organization: OzEmail Pty Ltd
Lines: 18
Sender: JOHN DAY <[e-mail]>
Message-ID: <[e-mail]>
NNTP-Posting-Host: ucsd.edu
Originator: [e-mail]

Hi,

I have a Farnell (UK) SSG-2000 synthesized signal generator which I want to
control from the HPIB port. Does anyone have a user manual? All I need is the
programming info, I do not need the whole thing. But -- It would be nice!

John Day VK3ZJF
[e-mail] or 100236,[e-mail]
Fax [phone]
Snail: PO Box 206, Oakleigh VIC 3166, Australia










From [e-mail] Fri Aug 04 16:49:23 1995
Path: grape.epix.net!sc2c526a.ra.osd.mil!nova.sti.nasa.gov!lerc.nasa.gov!magnus.acs.ohio-state.edu!math.ohio-state.edu!howland.reston.ans.net!swrinde!ihnp4.ucsd.edu!news1.ucsd.edu!news-mail-gateway
From: [e-mail] (JOHN DAY)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Ham-Homebrew Digest V95 #231
Date: 4 Aug 95 03:02:47 GMT
Organization: OzEmail Pty Ltd
Lines: 16
Sender: JOHN DAY <[e-mail]>
Message-ID: <[e-mail]>
NNTP-Posting-Host: ucsd.edu
Originator: [e-mail]

Herb,

You give no indication of where you are!

In the USA call AMIDON ASSOCIATES in the Orange County (Santa Ana) area on
[phone]. They have the best range aorund.

John Day VK3ZJF










From [e-mail] Fri Aug 04 16:49:25 1995
Path: grape.epix.net!sc2c526a.ra.osd.mil!nova.sti.nasa.gov!lerc.nasa.gov!magnus.acs.ohio-state.edu!math.ohio-state.edu!howland.reston.ans.net!news.moneng.mei.com!news.sol.net!solaria.mil.wi.us!garyk9gs
From: [e-mail] (Gary Schwartz)
Newsgroups: rec.radio.amateur.homebrew
Subject: Another Project Idea!
Date: 4 Aug 1995 05:46:30 GMT
Organization: Solaria Public Access UNIX - Milwaukee, WI
Lines: 34
Message-ID: <3vsc7n$[e-mail]>
NNTP-Posting-Host: solaria.mil.wi.us
X-Newsreader: TIN [version 1.2 PL1]


Here's another project idea.

I, like thousands of other hams, have one of those cheap MFJ dual clocks
that never seems to be able to keep the correct time.  Plus, I'm tired of
having to reset it all the time.

My idea is a clock that runs by itself, but gets its time set via the
serial or parallel port of a PC.  Perhaps the clock would reset itself to
the computer time when the PC is first turned on and then once a day for
those that leave their computer on all the time.

Some might argue that the clock in a PC is notoriously innaccurate.  While
this is certainly true, there are several shareware programs available
that will set the PC clock to WWV or the naval observatory via modem.  I
use one such program about once a week.  The call costs about fifteen
cents.

The clock would have dual (12 hour local/24 hour UTC) displays (LCD).

Anyone want to take up the challenge??

73,
Gary K9GS
--
         ________________________________________________________________
        |                                                                |
        | Gary Schwartz  K9GS           E-Mail: [e-mail] |
        | Society of Midwest Contesters   Packet:[e-mail] |
        | Greater Milwaukee DX Association Member                        |
        |________________________________________________________________|





From [e-mail] Fri Aug 04 16:49:26 1995
Path: grape.epix.net!sc2c526a.ra.osd.mil!nova.sti.nasa.gov!lerc.nasa.gov!magnus.acs.ohio-state.edu!math.ohio-state.edu!howland.reston.ans.net!newsfeed.internetmci.com!usenet.eel.ufl.edu!interlog.com!not-for-mail
From: [e-mail] (Jeff Mann)
Newsgroups: rec.radio.amateur.homebrew
Subject: Touch-tone DTMF interface to Macintosh needed
Date: 4 Aug 1995 06:30:56 -0400
Organization: InterLog Internet Services [phone] [e-mail]
Lines: 19
Message-ID: <3vsst0$[e-mail]>
NNTP-Posting-Host: gold.interlog.com

Hi - has anyone built an interface to control a Macintosh computer through
touch-tones? I want to be able to control a hypercard program remotely.

Ideally it would work in software; I'd send the audio into the microphone
input an analyse the tones. I have a program for the Mac that does this,
but I can't access the data from it. It just prints the numbers to the
screen. I've tried to contact the author, but no luck so far... btw, I'm
using an AV mac which has a DSP chip built-in.

Most likely I'll have to build a black box with a DTMF decoder chip in it,
and send the output through the serial port. If anyone has done this,
particularly to control Hypercard, I'd appreciate any advice. Thanks.

<jeff VE3-KYH

--

Jeff Mann - Information Consumer     ___O___O__= ---   [e-mail]
                                   ___O___O__= ---     [e-mail]


From [e-mail] Fri Aug 04 16:49:26 1995
Path: grape.epix.net!news.sprintlink.net!howland.reston.ans.net!ix.netcom.com!netnews
From: [e-mail] (Niel Wiegand)
Newsgroups: rec.radio.amateur.homebrew
Subject: Schematic Draw Program Recommendations?
Date: 4 Aug 1995 10:13:44 GMT
Organization: Netcom
Lines: 8
Distribution: world
Message-ID: <3vsrso$[e-mail]>
NNTP-Posting-Host: ix-aus2-14.ix.netcom.com

I'm looking for a DOS or Windows based draw/CAD program that includes
electronic symbols like inductors, transformers, caps, resistors and
tubes.

Has anyone found one that allows resizing, rotation, "sticky" end
points, vertical/horizontal alignment, etc?

Niel - WA5VLZ


From [e-mail] Fri Aug 04 16:49:27 1995
Newsgroups: rec.radio.amateur.homebrew,rec.radio.amateur.equipment
Path: grape.epix.net!news.sprintlink.net!simtel!news.kei.com!ub!galileo.cc.rochester.edu!fermi.nsrl.rochester.edu!skulski
From: [e-mail]
Subject: Looking for BUZ 332A specs/info.
Message-ID: <[e-mail]>
Lines: 21
Sender: [e-mail]
Nntp-Posting-Host: nsrlc6.nsrl.rochester.edu
Organization: Nuclear Structure Research Laboratory
Date: 4 Aug 95 11:22:18 -0500
Lines: 21
Xref: grape.epix.net rec.radio.amateur.homebrew:8735 rec.radio.amateur.equipment:15404

Hi:
 I have got a broken DC power supply, whose only problem
seems to be a blown BUZ 332A power FET transistor.
I tried to either buy such a transistor, or to find a replacement,
but weird enough I cannot find it in any catalog. I even asked
my friend in Europe to check it for me, but he could find
only BUZ 330 and BUZ 331. So, my questions are:

1. is there any US mail-order source, which would offer BUZ 332A?
2. what is the replacement for BUZ 332A (close replacement) ?
3. anybody knows the specs of BUZ 332A?

Please e-mail to [e-mail]

  Excuse me for taking bandwidth in this newsgroup. I could not
locate any other newsgroup dealing with electronic parts, this
one seemed to be the closest I could find.

Thank you in advance for info.

Wojtek


From [e-mail] Fri Aug 04 16:49:28 1995
Path: grape.epix.net!sc2c526a.ra.osd.mil!nova.sti.nasa.gov!lerc.nasa.gov!magnus.acs.ohio-state.edu!math.ohio-state.edu!howland.reston.ans.net!newsfeed.internetmci.com!news.sprintlink.net!news.primenet.com!usenet
From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Another Project Idea!
Date: 4 Aug 1995 12:38:53 GMT
Organization: Primenet
Lines: 22
Message-ID: <3vt4ct$[e-mail]>
References: <3vsc7n$[e-mail]>
Reply-To: [e-mail]
NNTP-Posting-Host: ip003.phx.primenet.com
X-Newsreader: IBM NewsReader/2 v1.2

In <3vsc7n$[e-mail]>, [e-mail] (Gary Schwartz) writes:

>My idea is a clock that runs by itself, but gets its time set via the
>serial or parallel port of a PC.  Perhaps the clock would reset itself to
>the computer time when the PC is first turned on and then once a day for
>those that leave their computer on all the time.
>
>Some might argue that the clock in a PC is notoriously innaccurate.  While
>this is certainly true, there are several shareware programs available
>that will set the PC clock to WWV or the naval observatory via modem.  I
>use one such program about once a week.  The call costs about fifteen
>cents.
        A good program to check out is Time Set availible on the Rancho Palo Verde
bbs. I can't get to the number right now but e-mail me and I'll have it.
        The program dials NIST or the Naval Observatory. This is well done but
not unusual. It also provides a sync pulse on one pin of the parallel port to allow
other devices to be linked.
        I never realized the MFJ was so bad. I bought the Radio Shack 1-1/2" face
digital clock, with 12/24 hour format. Easy to read, but bulky. I reset it about twice
a year. Of course it may vary from unit to unit.

Jim N7TCF


From [e-mail] Fri Aug 04 16:49:29 1995
Path: grape.epix.net!news.sprintlink.net!newsfeed.internetmci.com!usenet.eel.ufl.edu!news.ultranet.com!zombie.ncsc.mil!news.duke.edu!godot.cc.duq.edu!newsfeed.pitt.edu!uunet!in2.uu.net!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail
From: [e-mail] (W8JI  Tom)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Current balun
Date: 4 Aug 1995 13:18:06 -0400
Organization: America Online, Inc. (1-800-827-6364)
Lines: 40
Sender: [e-mail]
Message-ID: <3vtkoe$[e-mail]>
References: <3vohvl$[e-mail]>
Reply-To: [e-mail] (W8JI  Tom)
NNTP-Posting-Host: newsbf02.mail.aol.com


>Well Murray,
            Do you expect the cable manufacturers to be :
>Should they "know" what frequency your going to use their cable for?
>Should they "know" what length to make your cable?
>Should they "know" what power level your going to use?
>Should they "know" what attenuation you consider adequate?

>The torroid materials have a frequency range!
>They have a finite power handling ability/volume!
>They have finite attenuation characteristics.

>Enough?

>Tom

Tom and Murray,

That is very true. The problem of power handling can be simplified to the
voltage across each bead and the heating of the bead at that voltage on
that frequency. For example, one popular string of beads balun has an
equivilent parallel impedance of 1500 ohms R in parallel with 1500 ohms
XL.

The resistance dissipates power, and while that balun may handle 1500
watts with a balanced 50 ohm termination, it certainly won't handle much
power with a 500 ohm load or any antenna that has high voltage from the
terminals to ground.

I've found that if space is available it is much cheaper to use an air
wound balun than beads, and the power handling and choking impedance can
be made higher.

Roy Lewallan posted some nice impedance data on baluns last month. It was
good stuff.

Tom sure said it. Too many applications with too many variables involved
for one fits all product.

73 Tom


From [e-mail] Fri Aug 04 16:49:30 1995
Path: grape.epix.net!sc2c526a.ra.osd.mil!nova.sti.nasa.gov!lerc.nasa.gov!magnus.acs.ohio-state.edu!math.ohio-state.edu!howland.reston.ans.net!news.sprintlink.net!news.bluesky.net!solaris.cc.vt.edu!mkeitz
From: [e-mail] (Mike Keitz)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Another Project Idea!
Date: Fri, 04 Aug 95 14:09:31 GMT
Organization: TSE Systems
Lines: 37
Message-ID: <3vt9ok$[e-mail]>
References: <3vsc7n$[e-mail]>
NNTP-Posting-Host: mkeitz.beve.blacksburg.va.us
X-Newsreader: News Xpress Version 1.0 Beta #4

In article <3vsc7n$[e-mail]>,
   [e-mail] (Gary Schwartz) wrote:

[PC-settable clock idea snipped]

>Some might argue that the clock in a PC is notoriously innaccurate.  While
>this is certainly true, there are several shareware programs available
>that will set the PC clock to WWV or the naval observatory via modem.  I
>use one such program about once a week.  The call costs about fifteen
>cents.

Why use the PC at all then?  Build a modem into the clock!  The Motorola MC
145444 (unfortunately listed for about $8 - $12, but still cheaper than a
PC and modem) includes a DTMF dialer and a 300 baud modem.  The chip uses 8
mA at 5V while active and can be shut down when not.  Other companies make
similar chips for "call-home" applications like this.  There is a wide
market for them considering devices like credit-card verifiers, utility
meters, etc.  You would probably need a relay/transformer to couple to the
phone line, and likely some sort of FCC approval on the whole system.

Then the clock's serial port would be an *output* of accurate time, which
the PC could obtain from the clock any time it needs to, without incurring
any phone cost.  Also the clock could be taken anywhere, plugged into a
phone line, and set itself without needing any other hardware.  The reset
process could occur on a weekly or monthly schedule, or when the user
requests it by pressing a button on the clock.

Another option would be to equip the clock with a serial port intended for
input of the correct time from the PC as described, but also include in the
clock's software a protocol to drive an external modem (such as an old
Hayes Smartmodem 1200) to call in and get the time.  Then you have
clock+modem, rather than clock+modem+PC+software to do the same thing.

So many choices...

-Mike KD4QDM



From [e-mail] Fri Aug 04 16:49:31 1995
Newsgroups: rec.radio.amateur.homebrew
Path: grape.epix.net!news.sprintlink.net!howland.reston.ans.net!torn!nott!cunews!freenet.carleton.ca!FreeNet.Carleton.CA!by668
From: [e-mail] (Marc Buron)
Subject: Want to build a power supply
Message-ID: <[e-mail]>
Sender: [e-mail] (Marc Buron)
Organization: The National Capital FreeNet, Ottawa, Ontario, Canada
Date: Fri, 4 Aug 1995 16:02:23 GMT
Lines: 15



Hello,

I want to build a 13.5 Vdc 20 Amp.
I need someone to draw up the schematics and list of pieces,
I know some of you will say that it would cost less to buy one
but I already have many pieces that can probably be used,
so if there's a genius in that field around, i'd love to hear
from them...


Thanks many times...

Marc


From [e-mail] Fri Aug 04 16:49:31 1995
Path: grape.epix.net!news.sprintlink.net!howland.reston.ans.net!math.ohio-state.edu!news.cyberstore.ca!vanbc.wimsey.com!unixg.ubc.ca!atha!rwa
From: [e-mail] (Ross Alexander)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Another Project Idea!
Date: 4 Aug 1995 17:37:02 GMT
Organization: Athabasca University
Lines: 30
Message-ID: <3vtlrv$[e-mail]>
References: <3vsc7n$[e-mail]> <3vt4ct$[e-mail]>
NNTP-Posting-Host: aupair.cs.athabascau.ca
X-Newsreader: NN version 6.5.0 #10 (NOV)

[e-mail] writes:

>In <3vsc7n$[e-mail]>, [e-mail] (Gary Schwartz) writes:

>>Some might argue that the clock in a PC is notoriously innaccurate.
>>While this is certainly true, there are several shareware programs
>>available that will set the PC clock to WWV or the naval observatory
>>via modem.  I use one such program about once a week.  The call
>>costs about fifteen cents.

I run an NTP client on my pc (a clonebox 486), and as a result its
clock is accurate to about +- 25 milliseconds at all times.  That's
one of the joys of running a un*x and having a PPP link to the
internet :).  See comp.protocols.time.ntp for more info.  Without the
NTP client, the pc gains two or three minutes a month and drifts
wildly with temperature.

>       I never realized the MFJ was so bad. I bought the Radio Shack
>1-1/2" face digital clock, with 12/24 hour format. Easy to read, but
>bulky. I reset it about twice a year. Of course it may vary from unit
>to unit.

There must be a lot of variation; an MFJ here loses about 12 to 13
seconds a month, while a $20 timex watch (which has a 24 hour display
format option) is only 50 seconds slow after two years.

regards,
Ross ve6pdq
--
Ross Alexander, ve6pdq  --  [phone]  --  [e-mail]


From [e-mail] Fri Aug 04 16:49:32 1995
Path: grape.epix.net!sc2c526a.ra.osd.mil!nova.sti.nasa.gov!lerc.nasa.gov!magnus.acs.ohio-state.edu!math.ohio-state.edu!howland.reston.ans.net!news.starnet.net!wupost!news.utdallas.edu!corpgate!crchh327.rich.bnr.ca!brtph500.bnr.ca!bcarh189.bnr.ca!bcarh8ab.bnr.ca!news
From: [e-mail] (Dean Denter)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Another Project Idea!
Date: 4 Aug 1995 17:39:22 GMT
Organization: Bell-Northern Research Ltd. Canada
Lines: 38
Distribution: world
Message-ID: <3vtm0a$[e-mail]>
References: <3vsc7n$[e-mail]>
Reply-To: [e-mail]
NNTP-Posting-Host: bcars862.bnr.ca

In article [e-mail], [e-mail] (Gary Schwartz) writes:
>
>Here's another project idea.
>
>I, like thousands of other hams, have one of those cheap MFJ dual clocks
>that never seems to be able to keep the correct time.  Plus, I'm tired of
>having to reset it all the time.
>
>My idea is a clock that runs by itself, but gets its time set via the
>serial or parallel port of a PC.  Perhaps the clock would reset itself to
>the computer time when the PC is first turned on and then once a day for
>those that leave their computer on all the time.
>
>Some might argue that the clock in a PC is notoriously innaccurate.  While
>this is certainly true, there are several shareware programs available
>that will set the PC clock to WWV or the naval observatory via modem.  I
>use one such program about once a week.  The call costs about fifteen
>cents.
>

Why go to all this trouble, and then have to pay to update your clock?
Last  time I checked CHU (the Canadian version of WWV) output a data burst
every minute or so for just this purpose.

There was a project designed some time ago with receiver, decoder, and
software for updating a machine running un*x.  Last that I checked the
schematics/instructions/etc were available on the local ham fileserver
hydra.carleton.ca, somewhere in the anonymous ftp section.  I haven't
built this thing yet, so I can't comment on how well it works.

regards,
Dean.
---
Dean Denter               work -> [e-mail]
VA3CDD                    play -> [e-mail]
[[[[[[[[[[[[[[[[[[I speak only for myself]]]]]]]]]]]]]]]]]]




From [e-mail] Mon Aug 07 17:15:45 1995
Path: grape.epix.net!news.sprintlink.net!oronet!news
From: [e-mail] (Jim Weir)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: (no subject)
Date: Sun, 06 Aug 1995 22:13:00 GMT
Organization: RST Engineering
Lines: 16
Message-ID: <403f3p$[e-mail]>
References: <3vohta$[e-mail]>
NNTP-Posting-Host: @rst-engr.oro.net
X-Newsreader: Forte Free Agent v0.55

Grover Cleveland <[e-mail]> wrote:

>Can someone please point me to the qrp mailing list?

>73 de WT6P


Well, migod, look who is on the 'net with the rest of us mortals!!


Jim Weir VP Engineering  | "I turned to my wife, as startled as the
RST Engineering          | pilot by what I'd seen.  Dirt-streaked,
Grass Valley CA 95945    | glorious, she smiled at me, tear-bright
voice/fax [phone]   | radiance.  'Richie, they're going to try
[e-mail]         | for it!' she said, "Wish them love!'" (Bach)



From [e-mail] Mon Aug 07 17:15:46 1995
Path: grape.epix.net!news.sprintlink.net!cs.utexas.edu!math.ohio-state.edu!news.cyberstore.ca!vanbc.wimsey.com!news.rmii.com!nexus.interealm.com!root
From: [e-mail] (wayne wicks)
Newsgroups: rec.radio.amateur.homebrew
Subject: 4-1000
Date: Sat, 05 Aug 1995 05:38:11 GMT
Organization: ICG/MagNET [phone]
Lines: 4
Message-ID: <3vuvtb$[e-mail]>
Reply-To: [e-mail]
NNTP-Posting-Host: ppp202.interealm.com
X-Newsreader: Forte Free Agent 1.0.82

Looking for a Good homebrew HF amp with 4-1000 finale/working.
wa2kec
[e-mail]



From [e-mail] Mon Aug 07 17:15:47 1995
Path: grape.epix.net!news.sprintlink.net!cs.utexas.edu!math.ohio-state.edu!news.cyberstore.ca!vanbc.wimsey.com!news.rmii.com!newsjunkie.ans.net!news0.cybernetics.net!usenet
From: [e-mail] (Si Ballenger Slip >>>> PPP/Shell?)
Newsgroups: alt.radio.pirate,sci.electronics,rec.radio.amateur.homebrew
Subject: Re: Anyone use and/or like the Ramsey TV-6 transmitter?
Date: 5 Aug 1995 05:37:30 GMT
Organization: Very little right now!
Lines: 40
Message-ID: <3vv02q$[e-mail]>
References: <3vp73l$[e-mail]> <[e-mail]>
NNTP-Posting-Host: 204.148.32.22
X-Newsreader: News Xpress Version 1.0 Beta #4
Xref: grape.epix.net alt.radio.pirate:9472 sci.electronics:138377 rec.radio.amateur.homebrew:8746

In article <[e-mail]>,
   [e-mail] (Jonas Grumby) wrote:
>In article <3vp73l$[e-mail]>, Wyatt Earp <[e-mail]>
wrote:
>>I bought the Ramsey TV-6 kit and the LPA-1 1 watt amp with the hopes
>>of transmitting my cable box / VCR to all the TV's in the house and
>>not have to run coax.  The kits went together with no problems, but
>>the performance from the TV-6 transmitter is nothing to brag about.  I
>>have managed to get a crappy, rolling, wavy black and white picture
>>with some audio.  Doesn't matter if I use the TV-6 kit alone with the
>>built in whip, an external 'dipole' of (2) 3.5 foot wires, or the
>>LPA-1 and the dipole.  It is looking like this will never replace
>>running coax to every TV in the house.
>>
>  <snip>
>>Thanks,
>>
>>Wyatt
>>
>
>I've had about the same luck with mine although I have noticed
>that some receivers work better than others.  Also, I could
>sometimes tune in a decent picture but the audio would be
>terrible and vice versa.
>
>Oh well..
>
>Jonas
>

  A different approach to try is getting commercially made video
transmitters. I bought one (actually 2, one to use and one to experiment
with) from a dealer at a hamfest. It is different from the usual home video
sender in that it transmits on channel 15, so it doesn't need a special
reciever. It sends a nice clean signal from one end of the house to the
other. I have a LPA-1 that I plan to build soon and see if the signal
quality remains good when amplified. The name of this device is Nippon
America Wireless Videosender WV-050. If anybody has already experimented
with it, let me know. Radio is nice, but a picture is worth a thousand
words!                                                Si B.


From [e-mail] Mon Aug 07 17:15:49 1995
Path: grape.epix.net!news.sprintlink.net!howland.reston.ans.net!news-e1a.megaweb.com!newstf01.news.aol.com!uunet!in2.uu.net!winternet.com!news
From: [e-mail] (Max Klingert)
Newsgroups: alt.radio.pirate,sci.electronics,rec.radio.amateur.homebrew
Subject: Re: Anyone use and/or like the Ramsey TV-6 transmitter?
Date: 6 Aug 1995 19:41:25 GMT
Organization: StarNet Communications, Inc
Lines: 34
Message-ID: <4035t5$[e-mail]>
References: <3vp73l$[e-mail]> <[e-mail]>
NNTP-Posting-Host: subzero.winternet.com
Xref: grape.epix.net alt.radio.pirate:9488 sci.electronics:138558 rec.radio.amateur.homebrew:8775

In article <[e-mail]>,
Jonas Grumby <[e-mail]> wrote:
>In article <3vp73l$[e-mail]>, Wyatt Earp <[e-mail]> wrote:
>>I bought the Ramsey TV-6 kit and the LPA-1 1 watt amp with the hopes
>>of transmitting my cable box / VCR to all the TV's in the house and
>>not have to run coax.  The kits went together with no problems, but
>>the performance from the TV-6 transmitter is nothing to brag about.  I
>>have managed to get a crappy, rolling, wavy black and white picture
>>with some audio.  Doesn't matter if I use the TV-6 kit alone with the
>>built in whip, an external 'dipole' of (2) 3.5 foot wires, or the
>>LPA-1 and the dipole.  It is looking like this will never replace
>>running coax to every TV in the house.
>>
>
>I've had about the same luck with mine although I have noticed
>that some receivers work better than others.  Also, I could
>sometimes tune in a decent picture but the audio would be
>terrible and vice versa.
>

I built 2 for my sister so she could have a couple of cameras in the barn to
keep an eye on a couple of mares about to foal. Both worked over a good
distance (100-150 feet) to an old B/W TV but I had to replace the coil on one
to tune it to ch 6. All she needed was to see that something was about to
happen, no need for good audio or video. While testing them at home, I had a
hard time getting a really good picture with audio more than a few feet away.
Things to try would be resoldering any suspect joints, making sure lead
lengths are as short as possible and use a regulated supply. Batteries run
down quickly. I also used a dipole for each "eyeballed" to the right freq.
From my experience, I would say it isn't the way to distribute a good A/V
signal over any distance....

Max        [e-mail]



From [e-mail] Mon Aug 07 17:15:50 1995
Path: grape.epix.net!news.sprintlink.net!newsfeed.internetmci.com!newshost.vvm.com!news
From: [e-mail] (Dwain Coufal)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Can Schems/Diags be Posted here? *.uue??
Date: Mon, 07 Aug 1995 13:54:59 GMT
Organization: VVM, Inc.
Lines: 46
Message-ID: <4056g4$[e-mail]>
References: <3vhpu2$[e-mail]> <3vrrgv$[e-mail]>
NNTP-Posting-Host: slip2.vvm.com
X-Newsreader: Forte Free Agent 1.0.82

[e-mail] (Rich Mulvey) wrote:

>Anthony G. Catalano ([e-mail]) wrote:
>: I wonder If we can post scanned drawings, scematics etc. in this newsgroup?

>: I would post them as an attached *.uue file that would have to
>: be uue-decoded back into a pcx or a gif file.
>: Anthony G. Catalano WW2W

>   No, this is a discussion group, and it would be considered rude,
>especially since a large number of the people reading the group have to
>pay for every byte that passes through their modems.

>   The generally approved method is to place the files on a public
>FTP site, and post a notice in the relevant group as to its
>availability.

>   Thank you, however, for asking.  A lot of people wouldn't have gone to
>the trouble.  :-)

>- Rich

I say it's time for a new newsgroup then.  How about,
rec.radio.amateur.homebrew.binary or something like that.  Then the
UUE files could be posted without *some* people thinking that it's
"rude".

Dwain

*******************************************************************************
*  Dwain A. Coufal                   The follwing is a list of far too many   *
*                                    email addresses for just 1 person!!!!!   *
*                      preferred --->  (1) [e-mail]                     *
*                                      (2) [e-mail]                  *
*  Everything stated above is          (3) [e-mail]          *
*  solely the opinion of my brain,     (4) [e-mail]                 *
*  and my body should not be held      (5) GEnie address pending.....         *
*  responsible.                      or,                                      *
*                                      http://www.netins.net/showcase/bc/     *
*******************************************************************************
*       Is it the light at the end of the tunnel, or an oncoming train?!      *
*******************************************************************************
*               It is always lightest just before the dark.                   *
*******************************************************************************




From [e-mail] Mon Aug 07 17:15:51 1995
Path: grape.epix.net!news.sprintlink.net!news.bluesky.net!solaris.cc.vt.edu!uunet!in2.uu.net!DIALix!brisbane.DIALix.oz.au!not-for-mail
From: [e-mail] (Murray Kelly)
Newsgroups: rec.radio.amateur.homebrew
Subject: Current balun
Date: 6 Aug 1995 13:08:51 +1000
Organization: DIALix Services, Brisbane, Australia.
Lines: 39
Sender: [e-mail]
Message-ID: <401bo3$aer$[e-mail]>
NNTP-Posting-Host: [e-mail]
Keywords: Current , Balun

Thanks, Tom Sefranek, for your reply. Obviously there is some
confusion here, as we are talking apples and oranges. My fault
for not explaining further perhaps?

Just as old TV frame transformer ferrites are used for current
baluns at RF even tho their resonant frequency is at 15KHz the
resonance of EMI suppresive ferrites is mostly 'the lower, the
better'. The technique already exists. There are RF suppressive
computer cables available already and the extension to Coax is
logical.

The use of toroids is a poor solution really. The radius of the
toroids have a direct relationship to the effectiveness of RF
control. Halving the radius doubles the effect and to put ferrite
right up on the outside skin ia as close as one can get.

The other factor in toroids is the hight. In putting some ferrite in the plastic
the height is as long as the feeder. Not just the last 2 feet.
This would also have the benefit of increasing the surface area
to allow for heat disipation under total mismatch.

The need to go down from half inch to 1/4 inch coax to wind thru
a frame or toroid would be removed and the heating of its dielectric
and subsequent 'walking' of the center conductor removed. The feeder
could be half inch all the way with no expensive toroids to buy/fit.

To summarise:
The frequency range would be all RF but the higher freqs. would
be removed first.
Power handling should be high with an 'average' run of say, 10 m.
How much is 'enough'? Some is always better than none!
I would just like to see RF suppression at HF and VHF of legal
amateur powers for what should be a marginally more expensive
coax than we buy at the moment. The ferrite powder is cheap.
I know. I bought some. It is made for just this purpose - RF
suppresion on PC cables.

Think about it. And thanks for the come back.
Murray Kelly. vk4aok.


From [e-mail] Mon Aug 07 17:15:53 1995
Path: grape.epix.net!news.sprintlink.net!holonet!colossus.holonet.net!wem.org!steve6920
From: [e-mail] (Steve6920)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Dentron tuner (instruction / pay too much
Date: Fri, 04 Aug 1995 02:47:21 GMT
Message-ID: <[e-mail]>
Organization: World Evangelist Ministry
Distribution: world
Lines: 34

From: [e-mail] (Steve6920)
Subject: Re: Dentron tuner (instruction / pay too much

Hi Dan,
  If that is the tuner I am thinking about, it has a meter on the front
which indicates relative power (with a pot on the back to adjust
sensitivity.
  I have used the Dentron tuners for several years (both the Jr. Tuner and
the much larger MT-2000A.  I haven't had one bit of problems with them.
  To operate the tuner, you set the bandswitch and then adjust both the
transmitter and antenna capacitors for the best match.  You can get a
rough idea by adjusting for maximum background receiver noise.  The
settings will obviously change depending on the antenna you are using.
The only rule of thumb is the lower the letter setting on the bandswitch,
the more inductor you are switching in and the lower the operating
frequency.

The is a post on the back for the single wire antenna to which you would
hook a long wire or random wire antenna.  If you are using balanced
feedline, you would put a jumper between the single wire post and one post
of the balanced output. There should be a dotted line on the back
indicating where this jumper should be placed.  In addition, if you are
using the tuner on low frequencies and have a hard time matching the
antenna, you may want to put this jumper in as the addition of the balun
in the circuit will help tune low frequency long wires.
  If you will verifiy you have the Jr. Monitor tuner, I have the manual
and can copy it for you.  You can send me E-mail with an address.
                        73's
                           Steve

-------------------------------------------------------------------------
* ChristNET Global Christian Network Reaching the world with the Gospel *
* Christ Connection World Headquarters Los Angeles, CA. [phone]  *
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From [e-mail] Mon Aug 07 17:15:54 1995
Newsgroups: rec.radio.amateur.homebrew
Path: grape.epix.net!news.sprintlink.net!cs.utexas.edu!usc!howland.reston.ans.net!xlink.net!news.ppp.de!news.Hanse.DE!mwhh!dk3uz!ehramm
From: [e-mail] (Edmund H. Ramm)
Subject: Re: Do vacuum tubes have shelf life?
X-Newsreader: nn 6.4.18
Reply-To: [e-mail]
Organization: Private Linux/68k site
Message-ID: <[e-mail]>
References: <[e-mail]> <3v9hah$[e-mail]> <3vm0gq$[e-mail]> <[e-mail]>
Date: Fri, 4 Aug 1995 19:44:36 GMT
Lines: 12

[e-mail] (Alan M. Horowitz) writes:

>Didn't tubes have lots of "getter" in them as well?  Wonder what it was
>made of?

   Magnesium or barium.

   73, Eddi
--
   [e-mail] - [e-mail] - DK3UZ@DB0HHT.#HH.GER.EU
               Linux/m68k, the best U**x ever to hit an Atari!
    Distribution of this message via the Microsoft Network is prohibited


From [e-mail] Mon Aug 07 17:15:55 1995
Path: grape.epix.net!news.sprintlink.net!cs.utexas.edu!news.ti.com!news.dseg.ti.com!mksol!blair
From: [e-mail] (arthur blair)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Good SPICE book
Date: 5 Aug 1995 20:52:19 GMT
Organization: Texas Instruments Inc
Lines: 22
Message-ID: <400lm3$[e-mail]>
References: <3vopks$[e-mail]> <3vrv6f$[e-mail]>
NNTP-Posting-Host: mksol.dseg.ti.com
X-Newsreader: TIN [version 1.2 PL2]

Gene Mason ([e-mail]) wrote:
: Hi...Try Borders books at Preston and Royal Ln...Saw several there
: recently.Also Book stop at Preston/Forest Ln, although the Book Stop at
: Town East has the best selection of technical books in Dallas...And don't
: ask me why! Maybe has to do with AT&T being close by. Good Luck... Gene

On SPICE books:
The authors name is either banhaf or branhaf or something close. (Sorry,
I dont have it here). It's a great book and a quick read. It's written
for PSPICE, though. I dont know what platform the original poster uses.

On DFW Bookstores:
Check out Protech books (formerly taylors technical books) on
beltline just east of prestonwood mall. Big tore, good selection,
but full retail (ouch!).

Art.

--
"Television is chewing gum for the eyes" - Frank Lloyd Wright
Dont forget to vote in news.announce.newgroups !
My views dont express those of my employer, etc., etc.


From [e-mail] Mon Aug 07 17:15:56 1995
Path: grape.epix.net!news.sprintlink.net!dispatch.news.demon.net!demon!mail2news.demon.co.uk!lfheller.demon.co.uk!Leon
From: Leon Heller <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Good SPICE book
Date: Sun, 06 Aug 95 10:19:33 GMT
Organization: Home
Lines: 24
Message-ID: <[e-mail]>
References: <3vopks$[e-mail]> <3vrv6f$[e-mail]> <400lm3$[e-mail]>
Reply-To: [e-mail]
X-NNTP-Posting-Host: lfheller.demon.co.uk
X-Newsreader: Demon Internet Simple News v1.29

In article <400lm3$[e-mail]>
           [e-mail] "arthur blair" writes:

> : Hi...Try Borders books at Preston and Royal Ln...Saw several there
> : recently.Also Book stop at Preston/Forest Ln, although the Book Stop at
> : Town East has the best selection of technical books in Dallas...And don't
> : ask me why! Maybe has to do with AT&T being close by. Good Luck... Gene
>
> On SPICE books:
> The authors name is either banhaf or branhaf or something close. (Sorry,
> I dont have it here). It's a great book and a quick read. It's written
> for PSPICE, though. I dont know what platform the original poster uses.

I've got this book, I think it's pretty good as well. The author is Walter
Banzhaf, in fact. It's called Computer-Aided Circuit Analysis Using SPICE,
and is published by Prentice-Hall International. It's based on the PSPICE
demo software, which is available via ftp from various places.

Leon
--
Leon Heller, G1HSM                | "Do not adjust your mind, there is
E-mail [e-mail]  |  a fault in reality": on a wall
Phone: [phone]         |  many years ago in Oxford.


From [e-mail] Mon Aug 07 17:15:57 1995
Path: grape.epix.net!sc2c526a.ra.osd.mil!nova.sti.nasa.gov!lerc.nasa.gov!purdue!haven.umd.edu!news.umbc.edu!eff!news.duke.edu!zombie.ncsc.mil!simtel!news.kei.com!bloom-beacon.mit.edu!usc!howland.reston.ans.net!news.sprintlink.net!uunet!in2.uu.net!svc.portal.com!shell.portal.com!jobe.shell.portal.com!jkesling
From: [e-mail] (John Darrell Kesling)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Good SPICE book
Date: 7 Aug 1995 03:50:06 GMT
Organization: Portal Communications Company -- 408/973-9111 (voice) 408/973-8091 (data)
Lines: 16
Message-ID: <4042he$[e-mail]>
References: <3vopks$[e-mail]> <3vrv6f$[e-mail]> <400lm3$[e-mail]> <[e-mail]>
NNTP-Posting-Host: jobe.shell.portal.com
X-Newsreader: TIN [version 1.2 PL2]

I picked up a copy of "SPICE A Guide to Circuit Simulation & Analysis
Using PSpice" second edition by Paul W. Tuinenga and published by
Prentice Hall for $3.00 at one of those discount bookstores that pop
up in vacant store fronts.

It's copyright 1992 but answered a couple of questions on the first
scan though.

John
--
------------------------------------------------------------------------------
  John Kesling  -  [e-mail]   or   [e-mail]
------------------------------------------------------------------------------
    WA8ZGO      -  via AX.25 packet radio [e-mail]
------------------------------------------------------------------------------



From [e-mail] Mon Aug 07 17:15:58 1995
Path: grape.epix.net!news.sprintlink.net!cs.utexas.edu!usc!howland.reston.ans.net!news-e1a.megaweb.com!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail
From: [e-mail] (Athena1106)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: help needed with Colpits Osc.
Date: 5 Aug 1995 17:24:13 -0400
Organization: America Online, Inc. (1-800-827-6364)
Lines: 1
Sender: [e-mail]
Message-ID: <400nht$[e-mail]>
References: <3uvpqj$[e-mail]>
Reply-To: [e-mail] (Athena1106)
NNTP-Posting-Host: newsbf02.mail.aol.com

Make sure you have the right pins in the right place


From [e-mail] Mon Aug 07 17:15:59 1995
Path: grape.epix.net!news.sprintlink.net!newsfeed.internetmci.com!uunet!in2.uu.net!news.eng.convex.com!cowart
From: [e-mail] (Michael Cowart)
Newsgroups: rec.radio.amateur.homebrew
Subject: HELP: need 6LQ6!
Date: 7 Aug 1995 15:14:30 GMT
Organization: Engineering, Convex Computer Corporation, Richardson, Tx USA
Lines: 24
Message-ID: <405akm$[e-mail]>
NNTP-Posting-Host: neptune.convex.com
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[ Article crossposted from rec.radio.amateur.equipment ]
[ Author was Michael Cowart ]
[ Posted on 7 Aug 1995 15:12:40 GMT ]

 need four 6LQ6's for sweep tube amp, Dentron GLA-1000.

 Mike

 [phone] day
 [phone] night

--

-----------------------------------------------------------------
Mike Cowart  e-mail: [e-mail]      Convex Computer Corp.
My opinions are mine, not my employer's.    Richardson, Texas
-----------------------------------------------------------------

--

-----------------------------------------------------------------
Mike Cowart  e-mail: [e-mail]      Convex Computer Corp.
My opinions are mine, not my employer's.    Richardson, Texas
-----------------------------------------------------------------


From [e-mail] Mon Aug 07 17:16:00 1995
Path: grape.epix.net!news.sprintlink.net!dispatch.news.demon.net!demon!tank.news.pipex.net!pipex!howland.reston.ans.net!ix.netcom.com!netnews
From: [e-mail] (Guy Scott )
Newsgroups: rec.radio.amateur.homebrew
Subject: Info. on Palomar
Date: 5 Aug 1995 11:51:36 GMT
Organization: Netcom
Lines: 11
Message-ID: <3vvm08$[e-mail]>
NNTP-Posting-Host: ix-wpb-fl1-28.ix.netcom.com


   Hi all, just looking for some information on a company called
palomar which makes amps (Possible cb?) I've just received a 150 watt
amp which they make and would like to give it a good going over before
even considering its use for 10m. The Model #is tx-150.
  Thanks for any help!

  PS. Yes I know its a cb amp, but given my financial situation that
makes this unit as good as gold to me anyway!

 Henry (Ke4wbw)


From [e-mail] Mon Aug 07 17:16:01 1995
Path: grape.epix.net!news.sprintlink.net!newsfeed.internetmci.com!EU.net!howland.reston.ans.net!news-e1a.megaweb.com!newstf01.news.aol.com!uunet!in1.uu.net!pipeline!not-for-mail
From: [e-mail] (Anthony G. Catalano)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Longwave Transmitter
Date: 6 Aug 1995 04:40:58 -0400
Organization: The Pipeline
Lines: 46
Message-ID: <401v6q$[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: pipe2.nyc.pipeline.com
X-Newsreader: The Pipeline v3.1.1

On Fri,  4 Aug 1995 in article <Re: Longwave Transmitter>,
'[e-mail] (Jim Horner)' wrote:


>From the article "Ground Zero"  (Popular Electronics-Oct.'94):
>
>1750-Meter Experimenters' Band:
>- 160-190 kHz          - Max. power-1watt
>- Max. antenna length-50 ft. including ground lead and transmission line
----------------------------------------------------------------------
I don't care what THAT book said. It was either a misprint or a typo on
your part....
because I respectfully must imform all that the limit of the combined
feedline and antenna
system for transmitting can only be a maximum of 15 (fifteen) feet.
If you live near salt water, use it as a ground and place the x-mitter
directly at
the base of the antenna. The vertical portion would then be 15 feet (
constructed with a copper ribbon/tubing or multi-wire to compensate for
R-loss) with a large capacity hat to bring the resonance down as far as
possible without having the outer perimeter of the capacity hat fall below
20% of the vertical portion of the antennas' vertical mast
Out of the 1 watt input to the antenna, consider yourself lucky if 50
milliwatts remain as the radiated portion. A cold winter night is the best
time to recieve VLF signals because of the few static crashes.
  I remember reading about a small identifying paper having to be affixed
to the transmitter
with pertinent information on it. I will try to find the article/book that
I had read that from.
If ANYONE get a VLF transmitter on the air or would like to post a list of
vlf xmitters
that you can hear well please post it here. I'm sure 99.999 percent of that
stuff is homebrew.
It is also interesting that you literally can make up your own callsign/id
on there (trying not to duplicate an existing one) If you are allready a
ham you can use your call as it is very unlikely
that it is allready being used on vlf! Most IDs are 3 letters in lenght in
the entire vlf band.
A good idea for a vlf keyer would be a keyer that IDs with a qso number
that changes
every day so you can be sure that qsl report is a genuine one and get a
good picture of propagation...
I have also noticed that the vlf signals are all continuous AM keyed with
the identifying audio.
Enjoy. Anthony G. Catalano WW2W //"nothing is foolproof because fools are
so ingenious!" - unknown


From [e-mail] Mon Aug 07 17:16:02 1995
Path: grape.epix.net!news.sprintlink.net!cs.utexas.edu!usc!nic-nac.CSU.net!csulb.edu!info.ucla.edu!nnrp.info.ucla.edu!MVS.OAC.UCLA.EDU!OSYSMAS
From: [e-mail] (Michael Stein)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Longwave Transmitter
Date: Sun, 06 Aug 1995 10:53
Organization: University of California, Los Angeles
Lines: 13
Sender: MVS NNTP News Reader <[e-mail]>
Message-ID: <[e-mail]>
References: <401v6q$[e-mail]>
Reply-To: [e-mail]
NNTP-Posting-Host: mvs.oac.ucla.edu

>because I respectfully must imform all that the limit of the
>combined feedline and antenna system for transmitting can only
>be a maximum of 15 (fifteen) feet.

15 meters not feet.

>It is also interesting that you literally can make up your own
>callsign/id on there (trying not to duplicate an existing one)
>If you are allready a ham you can use your call as it is very
>unlikely that it is allready being used on vlf!

I wouldn't use an amateur call as the transmissions are clearly
out of any amateur band.


From [e-mail] Mon Aug 07 17:16:05 1995
Path: grape.epix.net!news.sprintlink.net!newsfeed.internetmci.com!bloom-beacon.mit.edu!news.moneng.mei.com!uwm.edu!lll-winken.llnl.gov!venus.sun.com!news2me.EBay.Sun.COM!eastnews1.East.Sun.COM!newsworthy.West.Sun.COM!abyss.West.Sun.COM!myers
From: [e-mail] (Dana Myers)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Longwave Transmitter
Date: 6 Aug 1995 18:46:10 GMT
Organization: SunSoft South, Los Angeles, CA
Lines: 64
Message-ID: <4032li$[e-mail]>
References: <[e-mail]> <401v6q$[e-mail]>
NNTP-Posting-Host: sunspot.west.sun.com

In article <401v6q$[e-mail]>,
Anthony G. Catalano <[e-mail]> wrote:
>On Fri,  4 Aug 1995 in article <Re: Longwave Transmitter>,
>'[e-mail] (Jim Horner)' wrote:
>
>
>>From the article "Ground Zero"  (Popular Electronics-Oct.'94):
>>
>>1750-Meter Experimenters' Band:
>>- 160-190 kHz          - Max. power-1watt
>>- Max. antenna length-50 ft. including ground lead and transmission line
>----------------------------------------------------------------------
>I don't care what THAT book said. It was either a misprint or a typo on
>your part....
>because I respectfully must imform all that the limit of the combined
>feedline and antenna
>system for transmitting can only be a maximum of 15 (fifteen) feet.

Where did you get this restriction?  You'd better get the
Code of Federal Regulations updated, too, since it also contains
the same "misprint".

Just so you can check on this, have a look at Title 47 of the
Code of Federal Regulations, Part 15.

>If you live near salt water, use it as a ground and place the x-mitter
>directly at
>the base of the antenna. The vertical portion would then be 15 feet (
>constructed with a copper ribbon/tubing or multi-wire to compensate for
>R-loss) with a large capacity hat to bring the resonance down as far as
>possible without having the outer perimeter of the capacity hat fall below
>20% of the vertical portion of the antennas' vertical mast
>Out of the 1 watt input to the antenna, consider yourself lucky if 50
>milliwatts remain as the radiated portion. A cold winter night is the best
>time to recieve VLF signals because of the few static crashes.
>  I remember reading about a small identifying paper having to be affixed
>to the transmitter
>with pertinent information on it. I will try to find the article/book that
>I had read that from.
>If ANYONE get a VLF transmitter on the air or would like to post a list of
>vlf xmitters
>that you can hear well please post it here. I'm sure 99.999 percent of that
>stuff is homebrew.
>It is also interesting that you literally can make up your own callsign/id
>on there (trying not to duplicate an existing one) If you are allready a
>ham you can use your call as it is very unlikely
>that it is allready being used on vlf! Most IDs are 3 letters in lenght in
>the entire vlf band.

You aren't allowed to a callsign which has been or could be issued
by the FCC, such as an amateur callsign.  Maybe you'd better that
mistake in Part 15 fixed, also.

>Enjoy. Anthony G. Catalano WW2W //"nothing is foolproof because fools are
>so ingenious!" - unknown

The irony of your quote darn near killed me.

;-)

--
 * Dana H. Myers KK6JQ, DoD#: j | Views expressed here are      *
 * [phone]               | mine and do not necessarily   *
 * [e-mail]      | reflect those of my employer  *


From [e-mail] Mon Aug 07 17:16:06 1995
Path: grape.epix.net!news.sprintlink.net!newsfeed.internetmci.com!EU.net!howland.reston.ans.net!news-e1a.megaweb.com!newstf01.news.aol.com!uunet!in2.uu.net!pipeline!not-for-mail
From: [e-mail] (Anthony G. Catalano)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Longwave Transmitter ['lowfer' band]
Date: 6 Aug 1995 04:46:42 -0400
Organization: The Pipeline
Lines: 19
Message-ID: <401vhi$[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: pipe2.nyc.pipeline.com
X-Newsreader: The Pipeline v3.1.1

On 03 Aug 1995 in article <Re: Longwave Transmitter ['lowfer' band]>,
'[e-mail] (Tovar)' wrote:


>My recent poking around the Internet has let me to conclude that 1750
meters
>is governed by Part 15:
>
>Sec. 15.217 Operation in the band 160-190 kHz.
>
>(a) The total input power to the final radio frequency stage
>(exclusive of filament or heater power) shall not exceed one watt.
>(b) The total length of the transmission line, antenna, and
>ground lead (if used) shall not exceed 15 meters.

Can you please check if it is 15 feet or meters?
15 meters is about 30 feet, I doubt that they would allow that height.
hmmmm this just gets curioser and curiouser....
Anthony Catalano WW2W


From [e-mail] Mon Aug 07 17:16:08 1995
Path: grape.epix.net!news.sprintlink.net!tank.news.pipex.net!pipex!newsfeed.internetmci.com!solaris.cc.vt.edu!mkeitz
From: [e-mail] (Mike Keitz)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Longwave Transmitter ['lowfer' band]
Date: Sun, 06 Aug 95 15:32:56 GMT
Organization: TSE Systems
Lines: 42
Message-ID: <402nb4$[e-mail]>
References: <[e-mail]> <401vhi$[e-mail]>
NNTP-Posting-Host: mkeitz.beve.blacksburg.va.us
X-Newsreader: News Xpress Version 1.0 Beta #4

In article <401vhi$[e-mail]>,
   [e-mail] (Anthony G. Catalano) wrote:
>On 03 Aug 1995 in article <Re: Longwave Transmitter ['lowfer' band]>,
>'[e-mail] (Tovar)' wrote:
>
>
>>My recent poking around the Internet has let me to conclude that 1750
>meters
>>is governed by Part 15:
>>
>>Sec. 15.217 Operation in the band 160-190 kHz.
>>
>>(a) The total input power to the final radio frequency stage
>>(exclusive of filament or heater power) shall not exceed one watt.
>>(b) The total length of the transmission line, antenna, and
>>ground lead (if used) shall not exceed 15 meters.
>
>Can you please check if it is 15 feet or meters?
>15 meters is about 30 feet, I doubt that they would allow that height.

1 foot = 0.3048 meter (or 1 meter = 3.28 feet)  So 15 meters is 49.2 feet,
which matches reasonably well with "50 feet" quoted in other sources.

How about a 49 foot cube of ferrite, with several turns of heavy copper
ribbon around it, then tuned to resonance with a BFC?  Or does the
regulation permit only vertical antennas, no loops?

>hmmmm this just gets curioser and curiouser....
>Anthony Catalano WW2W

I'd like to learn more as well.  Is the Part 15 you quoted on-line
somewhere, or will I have to walk 3 blocks to the library and read it from
paper?

-Mike KD4QDM









From [e-mail] Mon Aug 07 17:16:09 1995
Path: grape.epix.net!news.sprintlink.net!holonet!colossus.holonet.net!woodybbs!1-124-6518-0!morgan.ali
From: [e-mail] (Morgan Ali)
Date: 03 Aug 95 14:58:00
Newsgroups: rec.radio.amateur.homebrew
Subject: Looking for gears for Tempo
Message-ID: <[e-mail]>
X-FTN-To: UUCP
Organization: WoodyWare Software, Inc.
Lines: 7

you can always retro fit some or make a new switch all together :)
--
|Fidonet:  Morgan Ali 1:124/6518
|Internet: [e-mail]
|
| Standard disclaimer: The views of this user are strictly his own.



From [e-mail] Mon Aug 07 17:16:10 1995
Path: grape.epix.net!news.sprintlink.net!i-2000.com!usenet
From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: looking for plans: CB base antenna
Date: Sun, 06 Aug 1995 21:54:38 GMT
Organization: I-2000 Inc. - Internet Services
Lines: 6
Message-ID: <40335t$[e-mail]>
NNTP-Posting-Host: riverhead1.access1.dh.i-2000.net
X-Newsreader: Forte Free Agent 1.0.82

My young nephew got an old 23 channel CB and power supply at a yard sale.  He is
looking for an antenna but his funds are limited.  Does anyone have, or know
where I can get plans for a simple ground plane?  Construction from copper pipe
or tensioned wire is what I am thinking of.  I think he would enjoy making the
antenna more than saving to buy one.  Any suggestions appreciated.



From [e-mail] Mon Aug 07 17:16:10 1995
Path: grape.epix.net!news.sprintlink.net!news.connect.net!usenet
From: [e-mail] (David Bengtson)
Newsgroups: sci.electronics,rec.radio.amateur.homebrew
Subject: Modulating VCO's
Date: Sun, 06 Aug 1995 05:06:08 GMT
Organization: Connection Technologies
Lines: 11
Message-ID: <401inl$[e-mail]>
NNTP-Posting-Host: a1p13.connect.net
X-Newsreader: Forte Free Agent 1.0.82
Xref: grape.epix.net sci.electronics:138509 rec.radio.amateur.homebrew:8760

I'm looking for some pointers to detailed work on modulating vco's and
synthesizers for transmitters. I'm specificaly looking for more
information on Dual port modulation for FSK data. Technical reports
are fine, application notes, etc.

Thanks for any pointers

David Bengtson
Yes, these are my opinions
Looking for Old HP-41 Calculators and Accessories



From [e-mail] Mon Aug 07 17:16:12 1995
Newsgroups: rec.radio.amateur.homebrew
Path: grape.epix.net!news.sprintlink.net!uunet!in1.uu.net!noc.near.net!news3.near.net!emba-news.uvm.edu!moose.uvm.edu!ajcummin
From: [e-mail] (Aaron Cummings)
Subject: Re: Optoisolator cross-reference help and PAL programming information
Message-ID: <[e-mail]>
Sender: [e-mail]
Organization: EMBA Computer Facility, University of Vermont
X-Newsreader: TIN [version 1.2 PL2]
References: <[e-mail]>
Date: Sat, 5 Aug 1995 02:26:43 GMT
Lines: 43

David Negaard (Oberon-) ([e-mail]) wrote:
: I'm working on building the OptoSCC card designed by Henk Penk,
: PA0HZP, and intended for use with a variety of digital-mode modems.
: I've got the schematic, and I've located all the parts I need except
: for the optoisolator chip.  It's specified in the bill of materials as
: a PC847, and I can't find this chip or an equivalent.  I've e-mailed
: PA0HZP, but he may not be able to respond for any of a variety of
: reasons, so I'll try here.  Can anyone help?

By looking at the schematic, you should be able to determine what you
need for an optoisolator - I'm guessing that it is nothing too exotic,
probably just a bipolar output...T.I. makes several, check your Digi_key
catalog.

: The other part of the project that's missing is the PAL used to decode
: the PC bus logic.  It's a 20L10 and I can get the part, but I don't
: know how to program it.  Maybe I'm confused, but one must program
: Programmable Array Logic, mustn't one?

Yes, you will need to program the PAL, and it is not a trivial process.
Tools exist for developing PAL programs, but they cost $$ - Can you get
away with just using logic gates???

 : I expect that I could figure what the program ought to be,
given
: enough time and energy, but I thought I'd pursue a solution with those
: wiser, first (I hope you're all wiser than me, else the state of
: homebrew may be serious  ;->=  ).

: Is there any help available for me out there?
: --
: o David Negaard                         o [e-mail]
: o Help Desk Technician            o http://www.graceland.edu/~negaard
: o 700 College Avenue              o linux-phile
: o Lamoni, IA  50140               o 73 de KB0PXK

--
=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
Aaron Cummings               "A little nonsense now and then is
Colchester, VT                cherished by the wisest man..."
[e-mail]        -Willie Wonkka
KA1PYK
=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=


From [e-mail] Mon Aug 07 17:16:13 1995
Path: grape.epix.net!sc2c526a.ra.osd.mil!nova.sti.nasa.gov!lerc.nasa.gov!purdue!haven.umd.edu!news.umbc.edu!eff!news.duke.edu!zombie.ncsc.mil!simtel!news.kei.com!bloom-beacon.mit.edu!newsfeed.internetmci.com!news.sprintlink.net!cc.iu.net!news
From: [e-mail]   (Bill Newkirk)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: QEX Magazine
Date: 7 Aug 1995 03:52:39 GMT
Organization: Space Coast Amateur Technical Group
Lines: 22
Message-ID: <4042m7$[e-mail]>
References: <3vm17a$[e-mail]> <3vmuoo$[e-mail]>
Reply-To: [e-mail] (Bill Newkirk)
NNTP-Posting-Host: netport-28.iu.net
X-Newsreader: IBM NewsReader/2 v1.09

In <3vmuoo$[e-mail]>, [e-mail] (Henk Remijn) writes:
>In <3vm17a$[e-mail]>, [e-mail] (Jonathon Woodward) writes:
>>I am looking for the address and fax number of QEX magazine so I can
>>subscribe.  I am particularly interested in an article published in the
>>June 1993 edition on measuring SINAD with DSP.
>>Any help would be appreciated.
>>Cheers Jonathan
>QEX is published by the ARRL, I guess you can find their address somewhere.
>Henk
>Henk Remijn                    Systems engineer at
>PA3EOB (JO11WM)                        Cargill Wet Milling

ARRL phone: [phone] (also a new area code in the near future as well)
fax numbers: [phone] and [phone].

the area code is supposed to change to (860) later in the year.

Bill Newkirk WB9IVR                  The Space Coast Amateur Technical Group
Melbourne, FL                       duty now for the future of amateur radio
Lombardi's 1st Law of Business:
Companies succeed in spite of their best effort.  If they succeed at all.



From [e-mail] Mon Aug 07 17:16:14 1995
Path: grape.epix.net!news.sprintlink.net!tank.news.pipex.net!pipex!sunsite.doc.ic.ac.uk!lyra.csx.cam.ac.uk!pmms.cam.ac.uk!andrew
From: [e-mail] (Andrew Thomason)
Newsgroups: rec.radio.amateur.homebrew,rec.radio.shortwave,rec.radio.amateur.digital.misc,uk.radio.amateur,sci.electronics
Subject: Rotary encoders
Date: 7 Aug 1995 12:35:47 GMT
Organization: DPMMS (Cambridge University - Pure Maths and Mathematical Statistics)
Lines: 10
Distribution: world
Message-ID: <4051b3$[e-mail]>
NNTP-Posting-Host: owl.pmms.cam.ac.uk
Xref: grape.epix.net rec.radio.amateur.homebrew:8783 rec.radio.shortwave:56662 rec.radio.amateur.digital.misc:9922 sci.electronics:138624

Do rotary encoders "go off" after a year or so? Can they be repaired? Do they lose
their magnetism or is it just dust which gets inside?

I have a couple of digital radios which can be tuned by a knob, one cheap, one
expensive. In both cases, after a year's use, the frequency started to dither
around slightly whilst I smoothly turned the knob. I had thought this was due
to a brain-damaged chip but now think it must be the rotary encoder.

Many thanks,
Andrew Thomason ([e-mail])


From [e-mail] Mon Aug 07 17:16:14 1995
Path: grape.epix.net!news.sprintlink.net!newsfeed.internetmci.com!hookup!multiverse!199.218.112.130!sam
From: sam@colossus (Sam Goldwasser)
Newsgroups: rec.radio.amateur.homebrew,rec.radio.shortwave,rec.radio.amateur.digital.misc,uk.radio.amateur,sci.electronics
Subject: Re: Rotary encoders
Date: 07 Aug 1995 13:35:02 GMT
Organization: Multiverse
Lines: 19
Distribution: world
Message-ID: <SAM.95Aug7093502@colossus>
References: <4051b3$[e-mail]>
NNTP-Posting-Host: central.picker.com
In-reply-to: [e-mail]'s message of 7 Aug 1995 12:35:47 GMT
Xref: grape.epix.net rec.radio.amateur.homebrew:8785 rec.radio.shortwave:56672 rec.radio.amateur.digital.misc:9924 sci.electronics:138630

In article <4051b3$[e-mail]> [e-mail] (Andrew Thomason) writes:

> Do rotary encoders "go off" after a year or so? Can they be repaired? Do they lose
> their magnetism or is it just dust which gets inside?
> I have a couple of digital radios which can be tuned by a knob, one cheap, one
> expensive. In both cases, after a year's use, the frequency started to dither
> around slightly whilst I smoothly turned the knob. I had thought this was due
> to a brain-damaged chip but now think it must be the rotary encoder.

> Many thanks,
> Andrew Thomason ([e-mail])

They should not.  You may have really cheap encoders - mechanical contacts
rather than optical or magnetic design.  These can be cleaned if you can
get at them.

The other types should last a long time.

--- sam


From [e-mail] Mon Aug 07 17:16:15 1995
Path: grape.epix.net!sc2c526a.ra.osd.mil!nova.sti.nasa.gov!lerc.nasa.gov!purdue!haven.umd.edu!news.umbc.edu!eff!news.duke.edu!zombie.ncsc.mil!simtel!news.kei.com!bloom-beacon.mit.edu!newsfeed.internetmci.com!news.sprintlink.net!cc.iu.net!news
From: [e-mail]   (Bill Newkirk)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Schematic Draw Program Recommendations?
Date: 7 Aug 1995 03:56:49 GMT
Organization: Space Coast Amateur Technical Group
Lines: 24
Message-ID: <4042u1$[e-mail]>
References: <3vsrso$[e-mail]>
Reply-To: [e-mail] (Bill Newkirk)
NNTP-Posting-Host: netport-28.iu.net
X-Newsreader: IBM NewsReader/2 v1.09

In <3vsrso$[e-mail]>, [e-mail] (Niel Wiegand) writes:
>I'm looking for a DOS or Windows based draw/CAD program that includes
>electronic symbols like inductors, transformers, caps, resistors and
>tubes.
>Has anyone found one that allows resizing, rotation, "sticky" end
>points, vertical/horizontal alignment, etc?
>Niel - WA5VLZ

sounds like Autocad to the rescue here...of course it'd be better if you could
kick out a net list to feed other analysis tools...but you said dos/windows,
not unix.

one hint.  do all the work with a standard parts library and then do any
resizing at plot time. the computer and your postscript laser printer are
better at this than trying to draw every part to a different scale just so the
completed circuit fits the screen or paper.  most programs will have some
form of scale function in the output routines that affects the output only
and frees you from having to ever worry about that.

Bill Newkirk WB9IVR                  The Space Coast Amateur Technical Group
Melbourne, FL                       duty now for the future of amateur radio
Lombardi's 1st Law of Business:
Companies succeed in spite of their best effort.  If they succeed at all.



From [e-mail] Mon Aug 07 17:16:17 1995
Newsgroups: rec.radio.amateur.homebrew
Path: grape.epix.net!news.sprintlink.net!EU.net!howland.reston.ans.net!gatech!wa4mei!ke4zv!gary
From: [e-mail] (Gary Coffman)
Subject: Re: Schematic Draw Program Recommendations?
Message-ID: <[e-mail]>
Reply-To: [e-mail] (Gary Coffman)
Organization: Destructive Testing Systems
References: <3vsrso$[e-mail]> <4042u1$[e-mail]>
Date: Mon, 7 Aug 1995 15:55:11 GMT
Lines: 33

In article <4042u1$[e-mail]> [e-mail] (Bill Newkirk) writes:
>In <3vsrso$[e-mail]>, [e-mail] (Niel Wiegand) writes:
>>I'm looking for a DOS or Windows based draw/CAD program that includes
>>electronic symbols like inductors, transformers, caps, resistors and
>>tubes.
>>Has anyone found one that allows resizing, rotation, "sticky" end
>>points, vertical/horizontal alignment, etc?
>>Niel - WA5VLZ
>
>sounds like Autocad to the rescue here...of course it'd be better if you could
>kick out a net list to feed other analysis tools...but you said dos/windows,
>not unix.

Sounds like Orcad to the rescue here. :-)

It's much easier to use than Autocad for schematics, outputs a netlist
compatable with a number of autorouters, etc. The only drawback is that
it isn't cheap, but then neither is Autocad. A cheaper program is Supercad.
It has most of the drawing features of Orcad, but for only $99. It isn't
as good for complex designs, though, because it won't work with a hierarchy
of sheets, won't auto-number parts, make bills of materials, etc, but it
is adequate for most amateur projects.

An ideal setup is Orcad as a frontend for Pcad. *Now* you're talking
bucks, but it automates almost all of the tedium of translating an
idea to a schematic and circuit board layout.

Gary
--
Gary Coffman KE4ZV          |    You make it,     | gatech!wa4mei!ke4zv!gary
Destructive Testing Systems |    we break it.     | emory!kd4nc!ke4zv!gary
534 Shannon Way             |    Guaranteed!      | [e-mail]
Lawrenceville, GA 30244     |                     |


From [e-mail] Mon Aug 07 17:16:17 1995
Path: grape.epix.net!sc2c526a.ra.osd.mil!nova.sti.nasa.gov!lerc.nasa.gov!purdue!news.bu.edu!olivea!venus.sun.com!nntp-hub2.barrnet.net!news.Stanford.EDU!morrow.stanford.edu!morrow.stanford.edu!not-for-mail
From: [e-mail] (Stephen Parry)
Newsgroups: rec.radio.amateur.homebrew
Subject: stainless/titanium wire source
Date: 7 Aug 1995 08:01:50 -0700
Organization: Stanford University
Lines: 5
Sender: [e-mail]
Message-ID: <4059su$[e-mail]>
NNTP-Posting-Host: morrow.stanford.edu

Does anyone know a source for stainless steel, or even better
titanium, uninsulated wire in small quantities? I'm looking for
something around 20 AWG.

Stephen


From [e-mail] Mon Aug 07 17:16:18 1995
Path: grape.epix.net!sc2c526a.ra.osd.mil!nova.sti.nasa.gov!lerc.nasa.gov!purdue!haven.umd.edu!news.umbc.edu!hookup!usenet.eel.ufl.edu!gatech!howland.reston.ans.net!news-e1a.megaweb.com!newstf01.news.aol.com!uunet!in2.uu.net!sunrise.gv.ssi1.com!oronet!news
From: [e-mail] (Jim Weir)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: stainless/titanium wire source
Date: Mon, 07 Aug 1995 16:22:30 GMT
Organization: RST Engineering
Lines: 27
Message-ID: <405euj$[e-mail]>
References: <4059su$[e-mail]>
NNTP-Posting-Host: @rst-engr.oro.net
X-Newsreader: Forte Free Agent v0.55

[e-mail] (Stephen Parry) wrote:

>Does anyone know a source for stainless steel, or even better
>titanium, uninsulated wire in small quantities? I'm looking for
>something around 20 AWG.

>Stephen

Yes, go to any aviation repair shop or supply store (your local small
puddlejumper airport mechanic can help you find one, or there are a
hundred of them listed in a magazine called "Trade-A-Plane).  We use
stainless steel wire in many gauges for tying bolts and nuts down; it
is called "safety wire".  You can probably talk the mech into giving
you a few feet; a full roll is only a few bucks or so.

Titanium, on the other hand...

Jim Weir
Airframe & Powerplant Mechanic


Jim Weir VP Engineering  | "I turned to my wife, as startled as the
RST Engineering          | pilot by what I'd seen.  Dirt-streaked,
Grass Valley CA 95945    | glorious, she smiled at me, tear-bright
voice/fax [phone]   | radiance.  'Richie, they're going to try
[e-mail]         | for it!' she said, "Wish them love!'" (Bach)



From [e-mail] Mon Aug 07 17:16:19 1995
Path: grape.epix.net!news.sprintlink.net!cs.utexas.edu!swrinde!tank.news.pipex.net!pipex!soap.news.pipex.net!pipex!dish.news.pipex.net!pipex!news.pavilion.co.uk!usenet
From: [e-mail] (mit)
Newsgroups: rec.radio.amateur.homebrew
Subject: TMS 3802 IC Info
Date: Sat, 05 Aug 1995 23:08:41 +0100
Organization: Pavilion Internet plc, Brighton, England
Lines: 10
Message-ID: <400qtb$[e-mail]>
NNTP-Posting-Host: line0f.kemp-du.pavilion.co.uk
X-Newsreader: Forte Free Agent v0.38

Has anyone any information on this IC TMS3802A or another TMS3812NC.
They are used as dividers in an organ note generator circuit, late
70/80's.

Please reply by EMAIL if you can

Thanks a lot.

Lawrence



From [e-mail] Mon Aug 07 17:16:20 1995
Path: grape.epix.net!news.sprintlink.net!cs.utexas.edu!swrinde!tank.news.pipex.net!pipex!lade.news.pipex.net!pipex!dish.news.pipex.net!pipex!news.pavilion.co.uk!usenet
From: [e-mail] (mit)
Newsgroups: rec.radio.amateur.homebrew
Subject: TMS3802 Divider IC Info
Date: Sat, 05 Aug 1995 23:08:44 +0100
Organization: Pavilion Internet plc, Brighton, England
Lines: 10
Message-ID: <400qte$[e-mail]>
NNTP-Posting-Host: line0f.kemp-du.pavilion.co.uk
X-Newsreader: Forte Free Agent v0.38

Does anyone have any info or equivalenrt for TMS3802A (TO5 pack) or
TMS3812NC (DIP), in organ note generator possible late 70's or ealy
'80s vintage

Please reply by E-MAIL if you can

Thanks

Lawrence



From [e-mail] Mon Aug 07 17:16:20 1995
Path: grape.epix.net!news.sprintlink.net!cs.utexas.edu!swrinde!tank.news.pipex.net!pipex!dish.news.pipex.net!pipex!news.pavilion.co.uk!usenet
From: [e-mail] (mit)
Newsgroups: rec.radio.amateur.homebrew
Subject: TMS3802 Divider Info
Date: Sat, 05 Aug 1995 23:08:46 +0100
Organization: Pavilion Internet plc, Brighton, England
Lines: 9
Message-ID: <400qtf$[e-mail]>
NNTP-Posting-Host: line0f.kemp-du.pavilion.co.uk
X-Newsreader: Forte Free Agent v0.38

Does anyone have info on TMS3802 (TO-5) or TMS3812 (DIP) divider
circuits used in old style electronic organ note generators

Please reply via EMAIL if you can

Thanks

Lawrence



From [e-mail] Mon Aug 07 17:16:21 1995
Path: grape.epix.net!news.sprintlink.net!cs.utexas.edu!swrinde!ihnp4.ucsd.edu!news1.ucsd.edu!news-mail-gateway
From: [e-mail] (CITGATE)
Newsgroups: rec.radio.amateur.homebrew
Subject: Undeliverable Mail
Date: 6 Aug 95 19:03:18 GMT
Organization: ucsd usenet gateway
Lines: 9
Message-ID: <[e-mail]>
NNTP-Posting-Host: ucsd.edu
Originator: [e-mail]

Unknown Microsoft mail form. Approximate representation follows.

Message: Ham-Homebrew Digest V95 #237
Sent: Sat, Aug 5, 1995 8:55 AM
To: CheesmanDave
On Server: Mail 12 Corp. Woods
Date: Sun, Aug 6, 1995 3:03 PM
Reason: Could not be delivered because the destination Microsoft Mail server
could not be found.


From [e-mail] Mon Aug 07 17:16:22 1995
Path: grape.epix.net!news.sprintlink.net!simtel!harbinger.cc.monash.edu.au!yarrina.connect.com.au!labtam!news.mel.aone.net.au!OzEmail!usenet
From: [e-mail] (Flakey)
Newsgroups: rec.radio.amateur.homebrew
Subject: Uniden Plans wanted :) ..
Date: 6 Aug 1995 04:48:57 GMT
Organization: ACME
Lines: 10
Message-ID: <401hjp$[e-mail]>
NNTP-Posting-Host: slsyd3p24.ozemail.com.au
X-Newsreader: WinVN 0.99.4

lo'

can anyone tell me if you can get the schematic diagrams for the
Uniden Sundowner UHF CB from Uniden direct - or would anyone have the
schematics for the attachment mic&speaker ports ?

reply via email please :) .. [e-mail]

//flakey



From [e-mail] Mon Aug 07 17:16:24 1995
Newsgroups: rec.radio.amateur.homebrew
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From: [e-mail] (John Seboldt)
Subject: VFO Stability
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I'm pretty finicky about VFO drift, being a musician with acute
sensitivity to pitch.  So I thought I'd share a few experiences in
homebrewing 7 MHz VFO's and ask some other comments/advice.

The simple Hartley circuit (such as W7EL's Optimized QRP Xcvr) never
satisfied me -- it never seemed to settle down, with a slow drift downward
that never stopped.  This is after boiling the toroid (which helped), and
using NP0 caps. It went down about 200 Hz in an hour (cold start),
thereafter about 80 Hz per hour -- enough to notice during a QSO, because
at 750 Hz a change in pitch by a half-step (musically speaking) is about
40 Hz -- noticeable to me!  This is after boxing it up carefully, letting
it cool a long time, etc.

Incidentally, it's interesting to listen for drift when heating the leads
of individual components.  A quick probe with the iron, and withdrawing a
safe distance, showed that capacitors marked NP0 do indeed have *some*
drift in an imperfect world, but most of them moved very little (and in
either direction!)  Heating the transistor, and even the RIT tuning
diode, had less effect than I thought.  BUt, of course, the TOROID was
the biggest culprit, providing a siginificant downward drift of 1 or 2
kHz (i.e., more inductance) when the iron was stuck in the hole for about
2 seconds.  (This is a T-44-6 coil).

Substituting air wound Miniductor stock helped, but again that steady
drift down.

Then I built up the series-tuned Colpitts used by W1FB, a breadboard
version without a box.  At 7 MHz, a toroid inductor (about 6 uH) again
proved unsatisfactory, the drift being about the same.  Using a piece of
close spaced airwound coil stock, stability improved a lot, with many 1
hour periods where I could leave the room and return, and the pitch
remained steady to my ear.  (this means less than 40 Hz).

Better yet, a close-wound wire coil on a 1/2 inch ceramic form (no slug)
did even better in the above circuit.  One run I left it sitting all
night, and it stayed with a half-step at about 200 Hz audible pitch -- a
drift of about 10 Hz!  Spot checks during the day show┘d it staying
within about this range. Other runs varied, but were significantly better
than other configurations.  And all this without a box, though in a room
without windows with fairly steady temperature (when the central air isn't
on).

Both of the air-wound coils were far more immune to drift from blowing on
them at a distance (warm air from your breath).

My drift was measu╣ed by ear on a RS DX440 receiver, with BFO continually
recalibrated to zero beat on 10 MHz WWV.  (Yes, you CAN hear zero beat if
you listen for variations in background noise, and especially when it's
modulated with a continuous tone).

So, it seems that the old Miniductor stock, with its plastic ribs, is
pretty good, but prone to some drift from heating.  I wonder how good a
piece of small PVC pipe would work -- because my ceramic forms are a bit
large and I don't know how to cut them cleanly!

: John Seboldt  [e-mail]  / CW:  It don't mean a thing
:       Amateur radio K0JD...       /  if it ain't got that swing!
:    Church of the Annunciation,   / Di dah, di dah, di dah, di dah...
:           Minneapolis           /           (sorry, Duke!)




From [e-mail] Mon Aug 07 17:16:26 1995
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From: [e-mail] (WB3U)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: VFO Stability
Date: Sun, 06 Aug 95 23:30:47 GMT
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   [e-mail] (John Seboldt) wrote:
>
>Better yet, a close-wound wire coil on a 1/2 inch ceramic form (no slug)
>did even better in the above circuit.  One run I left it sitting all
>night, and it stayed with a half-step at about 200 Hz audible pitch -- a
>drift of about 10 Hz!  Spot checks during the day show┘d it staying
>within about this range. Other runs varied, but were significantly better
>than other configurations.  And all this without a box, though in a room
>without windows with fairly steady temperature (when the central air isn't
>on).

This agrees closely with my own experiences building VFOs.  One of the most
stable I ever produced was built around the older W7ZOI high-stability
(JFET) Hartley circuit.  I used an ARC-5 transmitter covering the 80M band
as a test bed and simply wired the FET, diode and one or two small fixed
ceramic caps onto the tube pins of the original oscillator.  The caps I
added were *not* NPO.  For anyone not familiar with these transmitters,
their VFOs used a very large ball-bearing tuning cap, an air trimmer, and a
large ceramic coil form (about 1-1/2") with heavy gauge wire and a tunable
iron slug.  All of the tuned components were enclosed in a formed aluminum
shield on the top side of the chassis.

Anyway, after installing the circuit in the original chassis, I found that
the original dial markings were almost exactly correct, and that only a
slight adjustment of the trimmer and slug were required for perfect
alignment.  Most of the cold start drift occurred in the first 15 minutes
and was measured at better than 100 Hz over the first hour, improving to
better than 10 Hz per hour thereafter.  After confirming this with cold
starts on several consecutive days, I let the oscillator run overnight.
The <= 10 Hz wanderings recorded during previous runs were both positive
and negative, and the final measurement after more than 24 hours was still
within 10 Hz of the frequency achieved after one hour of warmup. FWIW, the
counter used for these tests had a 10 MHz ovenized oscillator and was
adjusted to WWV (as necessary) before each measurement.

There is no question in my mind that ceramic forms and large gauge wire are
a significant aid to good VFO design.  At the very least, starting
with these components can save many hours of cut and try in attempting to
build stable VFOs.

73,  Jack  WB3U


From [e-mail] Mon Aug 07 17:16:27 1995
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From: [e-mail] (Anthony G. Catalano)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Want to build a power supply
Date: 6 Aug 1995 06:11:31 -0400
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If you can, use power PNP transistors as the pass devices because using
NPNs as pass
transistor place the load between from the emitter and ground. (affecting
regulation)
The PNP configuration puts the load between the positive supply and the
collector.
The collector, unlike the base and the emitter is the only non-controlling
electrode
on a 3 leg xsistor.
(actually the same can be done with an NPN by reversing a few things and
using an
positive groung isolated from the cabinet but its too confusing a project
for a beginner)
Look for a schematic that uses a good reference source, not just a zener
diode.
Reference groung at ONE common point: loops or ground voltage differences
can
become significant in high-current power supplies.
At 20 amps use 4 pass transistors as a minimum to run cool and also use
equalizing
resistors (.05 to .15ohms ??) at the output leg of each one in order to
avoid just
one from "hogging" all the current, creating a hot-spot within that
transistor.
Any regulated power supply for RF should us a METAL cabinet and the leads
should be
RF-shorted to ground using a few capacitors (.01 .47 and a 1uf from
positive to the
metal cabinet just befor exiting. The negative line may allready be
directyl connected
to ground in most cases so bypassing won't be needed.
Fuse the 110 in and the 12v out!!!
If possible include an overvoltage circuit to protect your fed equipment
from cooking. (a simple "crowbar" circuit.)
Meter, meter... use a meter.
Have fun & stay away from 3,000 volt B+ supply projects for now.
Anthony Catalano WW2W


From [e-mail] Mon Aug 07 17:16:30 1995
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From: [e-mail] (Mike Keitz)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Want to build a power supply
Date: Sun, 06 Aug 95 15:20:02 GMT
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In article <4024gj$[e-mail]>,
   [e-mail] (Anthony G. Catalano) wrote:
>If you can, use power PNP transistors as the pass devices because using
>NPNs as pass
>transistor place the load between from the emitter and ground. (affecting
>regulation)
>The PNP configuration puts the load between the positive supply and the
>collector.
>The collector, unlike the base and the emitter is the only non-controlling
>electrode
>on a 3 leg xsistor.
>(actually the same can be done with an NPN by reversing a few things and
>using an
>positive groung isolated from the cabinet but its too confusing a project
>for a beginner)

Although using a common-emitter configuration for the pass transistor has
some advantages, the main disadvantage is lower stability.  The
common-collector configuration (load connected to emitter) has inherent
negative feedback which prevents the emitter voltage from varying widely
while the base voltage is held constant.  (The fact that the emittter is a
"controlling leg" is an advantage since it controls in a manner that will
stabilize the output voltage).  Common-emitter circuits act more like
current sources, which makes it more difficult to stabilize the output
voltage.  Additionally the often low ft of power PNP transistors can
complicate the stability problem.  Another advantage of the
common-collector is that the drive current also flows into the load, rather
than needing to be dissipated in the driver.

>Look for a schematic that uses a good reference source, not just a zener
>diode.

Absolute laboratory precision of the output voltage is not required for
battery replacement type applications, since the equipment being powered is
built to handle varying battery voltages.  What is important is low ripple
from the reference source, since this ripple will appear at the output as
well.  A Zener diode with two capacitors in parallel with it (one small, to
catch RF, and one large, to stop 60 Hz) will do this job nicely.  Most
commercial supplies are built around the 723 type IC, which includes the
reference voltage generator for you.

>Reference groung at ONE common point: loops or ground voltage differences
>can
>become significant in high-current power supplies.

Absolutely.

>At 20 amps use 4 pass transistors as a minimum to run cool and also use
>equalizing
>resistors (.05 to .15ohms ??) at the output leg of each one in order to
                                      ^^^^^^^^^^
Should say "emitter" here, regardless of which lead is the output of the
amplifier.

>avoid just
>one from "hogging" all the current, creating a hot-spot within that
>transistor.

The equalizing resistors need to be in the emitter and/or base leads in any
case to absorb differences in the Vbe of the transistors.  The collector,
being a current source, will not be affected by a small resistor in series.
If power MOSFETS are used instead (generally more expensive), then no
resistors will be required, they are voltage-driven and can simply be
connected in parallel.

>Any regulated power supply for RF should us a METAL cabinet and the leads
>should be
>RF-shorted to ground using a few capacitors (.01 .47 and a 1uf from
>positive to the
>metal cabinet just befor exiting. The negative line may allready be
>directyl connected
>to ground in most cases so bypassing won't be needed.

Another important point.  Using the point where the negative lead leaves
the cabinet as the single point ground would make sense too.  Using a
capacitor of several hundred uF on the output will also make the
regulator's job easier in regard to transients, and may even be required to
keep the regulator stable into all loads.

>Fuse the 110 in and the 12v out!!!

Definitely need a fuse on the 120V in.  This is the only place that really
needs a fuse since the power supply doesn't generate power, it just
transforms it.  The 12V out will have a current limiter of some sort, and
if that fails, the input fuse will blow if it is sized properly.

>If possible include an overvoltage circuit to protect your fed equipment
>from cooking. (a simple "crowbar" circuit.)

Remember to RF-bypass the triger circuit for the crowbar to prevent it from
acting unnecessarily when there is RF around.  And never connect a supply
equipped with a crowbar directly to a lead-acid battery without a fuse (a
blocking diode will keep the fuse from blowing, but isn't essential for
safety).  Come to think of it, of course never connect ANYTHING to a
lead-acid battery without a fuse right at the battery.

>Meter, meter... use a meter.
>Have fun & stay away from 3,000 volt B+ supply projects for now.

In general, commercially-built linear power supplies (in the 5 Amp and up
class) use NPN transistors as the pass element, controlled by a 723 and
driven by a smaller NPN transistor.  The driver circuit is powered by
higher voltage from another winding on the transformer or (in smaller
supplies) a center-tapped rectifier arrangement.  With boosted drive
voltage readily available, the main advantage of the common-emitter pass
circuit, low dropout voltage, is not a factor, since the common-collector
stage can be driven to saturation.

Another trick, rather than dropping 0.7V at the full output current to
sense for overcurrent, is to monitor the base drive current instead, since
the gain of the output transistors is roughly known, a current limiter
adequate for protective purposes anyway can be realized without needing a
50W low-ohm resistor.

For low-current power supplies (1-5 A, for less than 1A just use a
3-terminal regulator), discrete transistor regulators are practical.
Usually the error amplifier is implemented with a NPN transistor with the
emitter connected to the reference and the base connected to a voltage
divider.  The reference is a Zener diode, or one really popular design used
the front-panel pilot light LED as the reference!  Not recommended unless
cost is a real concern.  The collector of the error amplifier transistor
drives a driver transistor, then the output transistor.  Both of these are
common-collector.  It is also quite feasible to use a 3-terminal regulator
to drive a current booster transistor for the 1-5A class, but the current
limiter for this design requires another medium-power transistor, and the
dropout voltage can be quite high as well.  The Radio Shack 2A supply
(copying not recommended), actually uses a 15V Zener driving two
common-collector stages with no feedback other than that inherent in the
voltage followers.  It doesn't work very well, but shows what can be gotten
away with.

-Mike KD4QDM


From [e-mail] Mon Aug 07 17:16:31 1995
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From: [e-mail] (Thomas C Sefranek)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Want to build a power supply
Date: 6 Aug 1995 11:31:30 -0400
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Well,
        What step-down transformer do you have? (Voltage and current)
That the FIRST place to start.
If you don't have a transformer, or want to size it before building/buying,
Assume you mean 13.6 Volts out,
Plus 3 volt loss in regulator burden,
Plus 1.5 volts rectifier burden,
You need a transformer with about 18 VRMS at the current you desire, or more.
Quick rule of thumb, for the capacitor is 1,000 mfd for every amp.
so about 20,000 mfd at 25 VDC minimum.
There are so many good choices for linear regulators and pass transistors,
DON'T use the tired multiple 2N3055 design unless it's the only transistors
you can get.
Power FET's rule!

Feel free to E-Mail me for further advice.

Tom

--
Thomas C. J. Sefranek  WA1RHP  Work: 508-425-2200  Home: 508-425-6672


From [e-mail] Mon Aug 07 17:16:32 1995
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From: [e-mail] (Anthony G. Catalano)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Why variable BFO?
Date: 6 Aug 1995 05:21:09 -0400
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On 2 Aug 1995 in article <Re: Why variable BFO?>,
'[e-mail] (Ian Mitchell)' wrote:


>Ok, does that mean in a low cost receiver with a not so narrow IF filter,
>a fixed frequency BFO (frequency set to middle of IF) could be used to
>resolve an SSB signal, regardless of which side band the signal is on,
>as long as there are no other nearby signals?
>
>And presumably small tuning steps would be a necessity.
First, yes but it would only be "clarified" if the original suppresed
carrier
frequency (converted) were to be adjusted to fall in the middle of the IF
to match
the fixed BFO frequency as your example gives.
By "as long as there are no othere signals" I mean it would still work, but
a
signal on "the other side" would not be selectively attenuated against
 the desired signal in any way unless the shaping of such an IF filter were
offset
to favor one of the sidebands.
A direct-conversion receiver works EXACTLY as YOU have described above
except that there is no frequency conversion performed, although
technically
speaking the first "IF" is the AUDIO produced! ( as you can imagine a fixed

bfo in a direct conversion receiver can become very boring feature- Ok for
WWV rec'pt.)
Anthony Catalano WW2W


From [e-mail] Mon Aug 07 17:16:33 1995
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From: [e-mail] (Anthony G. Catalano)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Why variable BFO?
Date: 6 Aug 1995 05:38:23 -0400
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On 2 Aug 1995 in article <Re: Why variable BFO?>,
'[e-mail] (Ian Mitchell)' wrote:


>And presumably small tuning steps would be a necessity.
oops forgot to answer that one...
Sure, small tuning steps would be peachy-keen to have.
however it has nothing to do mathematically/electronically
with the radio being able to detect signals or not.
(to receive them well/correctly, yes-- I am nit-picking to make a point
only))
If a commercial SSB or AM station is X-mitting exactly on 11005khz
and you can tune in 1khz increments (on SSB mode) and your in luck.
If a ham is on 7.180.5 the closest you can get to his/her frequency
would be 500hz. In THAT case 100hz tuning resolution WOULD
be a very desirable feature in order to zero-beat that signal and
recover it's original intelligence. In my opinion 100hz resolution for a
digital
receiver in ssb mode should be the highest minimum resolution acceptable.
Anthony Catalano WW2W


From [e-mail] Mon Aug 07 17:16:34 1995
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From: [e-mail] (Michael Black)
Date: 31 Jul 95 21:06:48
Newsgroups: rec.radio.amateur.homebrew
Subject: re: Why variable BFO?
Message-ID: <[e-mail]>
Organization: MtlNet (MBA.org) Juxtaposition BBS
Lines: 69

[e-mail] (Ian Mitchell) is wondering
why the low cost shortwave receivers have tuneable BFO's while
the more expensive ones have a LSB/USB switch.

I would think cost has a lot to do with it.  If you assume that
the switch selected BFO's are crystal controlled, then the cost
of the crystals is not warranted for inexpensive sets.  IN the
early days, I'm sure all BFO's were tuneable, and then only later
did crystal control arrive.  Thinking about it now, crystal controlled
BFO's probably didn't show up in amateur receivers till receivers
intended for SSB hit the market, and they were of course the
expensive receivers.  The low end receivers have basically stayed
the same.

One reason for going to crystal control of a BFO was the ease of
switching between the two sidebands.  When the receivers started
getting sharp filters intended for SSB, you wanted the BFO right on
the slope to take advantage of the sharpness of the filter.  If
the BFO's had stayed tuneable, you'd always have to keep fiddling
a bit each time you changed sidebands, to get that exact spot.

And yes, your thought about the selectivity of the receiver probably
does play a part.  The cheaper receivers would tend to have filters
with not so sharp curves, and there is not the need to get the BFO
right at a certain point.

When you start using a receiver with the relatively wide bandwidth
intended for AM broadcast, you you could put the BFO right in the
middle of the passband and you wouldn't even have single signal
selectivity.  It would be like a direct conversion receiver in that
you'd get the audio image, but with better dynamic range due to
there being selectivity, albeit wide, between the antenna and the
product detector.  A tuneable BFO in this case would have the effect
of a fine tuning control, just as tuning the "BFO" in a direct
conversion receiver tunes it across the band.

I have thought of the possibility of building a "hybrid" receiver,
where the first mixer would be fed with a synthesizer with something
like 5KHz steps (it's easier to build a quiet synthesizer as the
tuning steps get bigger), then put it through an FM-type crystal
filter at 10.7MHz, and either put a direct conversion receiver
after that or a second mixer with a 5KHz tuning range to take it
down to lower frequency final IF where there is a narrow filter
and product detector.  It would be a way of getting a relatively
simple general coverage receiver, but with the advantages of
synthesizer tuning.

I remember seeing one receiver in QST from about 1958 or so (the
year before I was born, so I read it a number of years later) which
was a single conversion six meter receiver.  It used in the IF a
then relatively new item, a manufactured crystal filter in the HF
range, and having something like a 4KHz bandwidth.  It used a
crystal controlled BFO, which makes sense since it's easier
keeping a crystal on frequency than an LC-tuned oscillator.  But
the BFO was right in the middle of the IF.  The idea being that
the filter was wide enough for things like CW and even SSB that
you could tune the receiver until you got the right beat note
and everything would be fine.

I hope that helps, and I'm glad you found the 10.245MHz crystals.
I'm not sure how the Australian dollar converts to Canadian these
days, but the price you mention sounds not too expensive, which is
the right price.

      Michael  VE2BVW
--
| InterNet: [e-mail]
| Standard disclaimer: The views of this user are strictly their own.



From [e-mail] Mon Aug 07 17:16:35 1995
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From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Why variable BFO?
Date: 7 Aug 1995 01:47:55 GMT
Organization: Ocean Surveys, Inc.
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In <[e-mail]>, [e-mail] (Michael Black) writes:
>[e-mail] (Ian Mitchell) is wondering
>why the low cost shortwave receivers have tuneable BFO's while
>the more expensive ones have a LSB/USB switch.
>

There are some very pricey professional HF receivers by Watkins-Johnson,
Racal, etc that STILL have variable BFO in the CW mode.

Very pricey receivers.......


P.J. "Josh" Rovero                            work:  [e-mail]
Ocean Surveys, Inc.                           play:   [e-mail]
Old Saybrook, CT 06475 USA               Amateur Radio:  KK1D



From [e-mail] Mon Aug 07 17:16:38 1995
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From: [e-mail] (Ian Mitchell)
Newsgroups: rec.radio.amateur.homebrew
Subject: re: Why variable BFO?
Date: 7 Aug 1995 02:36:23 GMT
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In article <[e-mail]>, [e-mail] says...
->
->[e-mail] (Ian Mitchell) is wondering
->why the low cost shortwave receivers have tuneable BFO's while
->the more expensive ones have a LSB/USB switch.
->
->I would think cost has a lot to do with it.  If you assume that
->the switch selected BFO's are crystal controlled, then the cost
->of the crystals is not warranted for inexpensive sets.  IN the
->early days, I'm sure all BFO's were tuneable, and then only later
->did crystal control arrive.  Thinking about it now, crystal controlled
->BFO's probably didn't show up in amateur receivers till receivers
->intended for SSB hit the market, and they were of course the
->expensive receivers.  The low end receivers have basically stayed
->the same.
->
->One reason for going to crystal control of a BFO was the ease of
->switching between the two sidebands.  When the receivers started
->getting sharp filters intended for SSB, you wanted the BFO right on
->the slope to take advantage of the sharpness of the filter.  If
->the BFO's had stayed tuneable, you'd always have to keep fiddling
->a bit each time you changed sidebands, to get that exact spot.
->
->And yes, your thought about the selectivity of the receiver probably
->does play a part.  The cheaper receivers would tend to have filters
->with not so sharp curves, and there is not the need to get the BFO
->right at a certain point.
->
->When you start using a receiver with the relatively wide bandwidth
->intended for AM broadcast, you you could put the BFO right in the
->middle of the passband and you wouldn't even have single signal
->selectivity.  It would be like a direct conversion receiver in that
->you'd get the audio image, but with better dynamic range due to
->there being selectivity, albeit wide, between the antenna and the
->product detector.  A tuneable BFO in this case would have the effect
->of a fine tuning control, just as tuning the "BFO" in a direct
->conversion receiver tunes it across the band.
->
->I have thought of the possibility of building a "hybrid" receiver,
->where the first mixer would be fed with a synthesizer with something
->like 5KHz steps (it's easier to build a quiet synthesizer as the
>-tuning steps get bigger), then put it through an FM-type crystal
->filter at 10.7MHz, and either put a direct conversion receiver
->after that or a second mixer with a 5KHz tuning range to take it
->down to lower frequency final IF where there is a narrow filter
->and product detector.  It would be a way of getting a relatively
->simple general coverage receiver, but with the advantages of
->synthesizer tuning.
->
->I remember seeing one receiver in QST from about 1958 or so (the
->year before I was born, so I read it a number of years later) which
->was a single conversion six meter receiver.  It used in the IF a
->then relatively new item, a manufactured crystal filter in the HF
->range, and having something like a 4KHz bandwidth.  It used a
->crystal controlled BFO, which makes sense since it's easier
->keeping a crystal on frequency than an LC-tuned oscillator.  But
->the BFO was right in the middle of the IF.  The idea being that
->the filter was wide enough for things like CW and even SSB that
->you could tune the receiver until you got the right beat note
->and everything would be fine.
->
->I hope that helps, and I'm glad you found the 10.245MHz crystals.
->I'm not sure how the Australian dollar converts to Canadian these
->days, but the price you mention sounds not too expensive, which is
->the right price.
->
->      Michael  VE2BVW

Thanks for that Michael, much appreciated.

As you've problably guessed I'm trying to design a general coverage receiver
using the MC3362 FM receiver chip. This device has two mixers and osc's with
IF's at 10.7MHz and 455KHz. The first LO is variable while the second is
fixed at 10.245MHz - hence my enquiry on the crystals.

I've tracked down the filters (ceramic) which are quite low cost, luckily.

For resolving AM, I'd like to use the ZN414 (MK414), because it has good
gain, built in AM detector and AGC. The signal for it being taken from the
output of the 455KHz filter via a switchable SSB section - explained below.

Instead of using the built-in VFO, I've designed a simple DDS, controlled
by an MC68HC705K1 low cost microcontroller from Motorola. The DDS is implemented
using an EPM7096 PLD from Altera. I'm hoping to avoid having to use an AD
converter by connecting the high order bit of the accumulator directly
to the 3362. The mixers in the 3362 look a lot like the Gilbert type, so I'm
hoping this idea works! I've calculated the fourier spectrum using a spreadsheet,
and it doesn't look any worse that a square wave!

Anyway, the other function of the PLD is to generate a 455KHz BFO signal,
under the control of the microcontroller. The BFO signal is also a TTL square
wave.

So, the problem is to mix the BFO signal with the 455KHz IF so that the ZN414
can detect it for SSB. My idea so far is as follows:

Since the 3362 provides the correct loading for the 455KHz, a JFET, with its
high input impedence could be used to tap off the signal from the output of the
IF. Following this a common emitter amp with its emitter resister connected to
the BFO output instead of GND, and the output feeding the input of another
455KHz ceramic filter, followed by the ZN414.

For AM the output of the BFO should be held low. For SSB this arrangement
would thus cause the signal to switch on and off at 455KHz, but the 455KHz
filter would reduce the harmonic content leaving a signal for the detector.

So, I am wondering if this method will work ok, or is there a simpler way?

I am open to, and appreciate any comments.

Cheers and thanks, Ian




From [e-mail] Thu Aug 10 15:32:58 1995
Path: grape.epix.net!sc2c526a.ra.osd.mil!nova.sti.nasa.gov!lerc.nasa.gov!magnus.acs.ohio-state.edu!math.ohio-state.edu!howland.reston.ans.net!EU.net!uunet!in1.uu.net!news-1a.csn.net!usenet
From: Jonathan Erdman <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: 1995 Crested Butte CO Beer Festival
Date: 10 Aug 1995 06:12:16 GMT
Organization: CBI
Lines: 6
Message-ID: <40c800$[e-mail]>
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Come drink some special beers in the sunny Rocky Mountains. Better yet,
bring some of your own brew for others to try. Lodging and meals
provided for brewers. For detailed information go to
http://www.cbinteractive.com/cbws/beer.html




From [e-mail] Thu Aug 10 15:32:59 1995
Path: grape.epix.net!sc2c526a.ra.osd.mil!nova.sti.nasa.gov!lerc.nasa.gov!magnus.acs.ohio-state.edu!csn!news-1a.csn.net!usenet
From: Jonathan Erdman <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: 1995 Crested Butte CO Beer Festival
Date: 10 Aug 1995 06:19:29 GMT
Organization: CBI
Lines: 6
Message-ID: <40c8dh$[e-mail]>
NNTP-Posting-Host: 199.117.108.4
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 1.1N (Macintosh; I; 68K)
X-URL: news:rec.radio.amateur.homebrew

Come drink some special beers in the sunny Rocky Mountains. Better yet,
bring some of your own brew for others to try. Lodging and meals
provided for brewers. For detailed information go to
http://www.cbinteractive.com/cbws/beer.html




From [e-mail] Thu Aug 10 15:32:59 1995
Newsgroups: rec.radio.amateur.homebrew,rec.radio.amateur.space
Path: grape.epix.net!news.sprintlink.net!crash!hns_west!bdonaldson
From: [e-mail] (Brian Donaldson)
Subject: 4 ft Aluminum Snow Coasters
Sender: [e-mail] (News Administrator)
Message-ID: <[e-mail]>
Date: Wed, 9 Aug 1995 17:58:46 GMT
Organization: Hughes Network Systems
X-Newsreader: News Xpress Version 1.0 Beta #3
Lines: 15
Xref: grape.epix.net rec.radio.amateur.homebrew:8841 rec.radio.amateur.space:4548

Anyone out there is Net-land know where someone from SoCal can find a NEW 4 ft
(or so) Alunimum Snow Coaster? (it's for playing around with KU band)

Brian, KF6BL

                          ,,,   Waddayamean, it's NOT workin'?!
                          (o o)
     =================oOO==(_)==OOo=====================================
     Brian Donaldson                    Project Engineer, Customer Svc
     Hughes Network Systems, Inc.       TES, Terrestrial, et al...
     10450 Pacific Center Ct.           Email: [e-mail]
     San Diego, CA 92121                Phone: [phone]
     Room 2077                          Fax:   [phone]
     ===================================================================



From [e-mail] Thu Aug 10 15:33:00 1995
Path: grape.epix.net!news.sprintlink.net!newsfeed.internetmci.com!miwok!infoway!don.phelps
From: [e-mail] (Don Phelps)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: 4-1000
Date: Wed,  9 Aug 1995 07:54:00 GMT
Message-ID: <[e-mail]>
Organization: The Infoway BBS [phone] 14,400 8-N-1
Distribution: world
References: <3vuvtb$[e-mail]>
Lines: 24

Wayne,

I have a 4-1000 HF amp.  Variable roller inductor, vac variable capacitors,
for continuous tuning.  Very heavy duty power supply with 240V variac for
continuous variability.
5' relay rack (w. castors) with lots of meters,
and window to watch the 4-1000 etc.
This looks like unit built for show in handbook article.
I have so many spare 4-1000s, I couldn't resist putting a second
one in parrallel, to make input impedance 50 ohms directly.

Would you like to buy it, or just trade schematics, experience
building these?  Too bad I am in California.

Don, N6MCE

 WW> Looking for a Good homebrew HF amp with 4-1000 finale/working.
 WW> wa2kec
 WW> [e-mail]



... [e-mail] POB9739 SAN RAFAEL CA 94912-9739
___ Blue Wave/QWK v2.12


From [e-mail] Thu Aug 10 15:33:01 1995
Newsgroups: rec.radio.amateur.homebrew
Path: grape.epix.net!sc2c526a.ra.osd.mil!nova.sti.nasa.gov!lerc.nasa.gov!magnus.acs.ohio-state.edu!math.ohio-state.edu!howland.reston.ans.net!cs.utexas.edu!convex!darwin.sura.net!fconvx.ncifcrf.gov!abyss!usenet
From: jmz <[e-mail]>
Subject: Amperex tube data
X-Nntp-Posting-Host: hawthorn.cis.net
Content-Type: text/plain; charset=us-ascii
Message-ID: <[e-mail]>
Sender: [e-mail]
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Date: Wed, 9 Aug 1995 22:31:12 GMT
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Lines: 6

 I am looking for data on the old Amperex twin tetrodes intended for VHF
service in the land mobile and avionic industry,circa 1970.I have a copy
of an Amperex flier circa 1966 but there were several released after
that.




From [e-mail] Thu Aug 10 15:33:01 1995
Path: grape.epix.net!sc2c526a.ra.osd.mil!nova.sti.nasa.gov!lerc.nasa.gov!purdue!haven.umd.edu!news.umbc.edu!europa.chnt.gtegsc.com!usenet.eel.ufl.edu!col.hp.com!sdd.hp.com!swrinde!howland.reston.ans.net!newsfeed.internetmci.com!news.compuserve.com!news.production.compuserve.com!news
From: Eric Hoppe <[e-mail]>
Newsgroups: rec.radio.amateur.antenna,rec.radio.amateur.homebrew,alt.radio.pirate
Subject: An SWR/RF Power Meter
Date: 10 Aug 1995 00:53:52 GMT
Organization: Progressive Concepts
Lines: 8
Message-ID: <40blb0$et2$[e-mail]>
Xref: grape.epix.net rec.radio.amateur.antenna:12711 rec.radio.amateur.homebrew:8852 alt.radio.pirate:9558

We have the Diamond Antenna Model SX-200 RF power Meters in stock
for only $135 plus $6 shipping. These meters show forward and
reflected power and SWR. Switchable full scale readings of 5, 20,
and 200 watts. 30 day money back offer, and full one year warranty.
Visa and Master Card accepted. Call Today!

--
Progressive Concepts [phone] Fax:[phone]


From [e-mail] Thu Aug 10 15:33:02 1995
Path: grape.epix.net!sc2c526a.ra.osd.mil!nova.sti.nasa.gov!lerc.nasa.gov!magnus.acs.ohio-state.edu!math.ohio-state.edu!howland.reston.ans.net!newsfeed.internetmci.com!news.compuserve.com!news.production.compuserve.com!news
From: steve monsey <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: ATV newsgroup
Date: 8 Aug 1995 15:57:15 GMT
Organization: CompuServe, Inc. (1-800-689-0736)
Lines: 10
Message-ID: <4081gr$l8$[e-mail]>
References: <3vrlq8$[e-mail]>

>Is there a newsgroup where ATV is discussed?  Can't seem to find
>one.


I wish there was a newsqroup. If you find it let me know! My ATV
group has just started a WWW page. It just started so there is
not much there. But we intened to have lots of cool stuff.
The address is http//www.prostar.com/web/ham-tv.html.

steve N0FPF -- Seattle


From [e-mail] Thu Aug 10 15:33:03 1995
Path: grape.epix.net!sc2c526a.ra.osd.mil!nova.sti.nasa.gov!lerc.nasa.gov!purdue!ames!niven.ksc.nasa.gov!usenet
From: Roger Koss <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: ATV Tuner from UHF TV Tuner
Date: 9 Aug 1995 12:01:56 GMT
Organization: NASA, Kennedy Space Center, Payload Operations
Lines: 10
Message-ID: <40a83k$[e-mail]>
NNTP-Posting-Host: 163.205.78.66
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
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Does anyone have any info on converting an old UHF TV Tuner to receive
ATV on the 70cm band ? I believe that UHF Channel 14 is just above the 70
cm band, and I was recently told that there was an article in "Nuts and
Volts" magazine which described the mod(s) required. I know that I can
use a cable tv tuner on channels 54-57 or so, but unfortunately I haven't
been able to lay my hands on a spare cable TV tuner for a reasonable
price. I do however have access to a broken TV whose tuner I might be
able to salvage. Any info would be appreciated. Please post replies here
or E-Mail to [e-mail]. Thanks!



From [e-mail] Thu Aug 10 15:33:04 1995
Path: grape.epix.net!news.sprintlink.net!howland.reston.ans.net!newsfeed.internetmci.com!news.compuserve.com!news.production.compuserve.com!news
From: steve monsey <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: ATV Tuner from UHF TV Tuner
Date: 9 Aug 1995 22:10:28 GMT
Organization: CompuServe, Inc. (1-800-689-0736)
Lines: 15
Message-ID: <40bbok$glq$[e-mail]>
References: <40a83k$[e-mail]>

You are sorta right! If you use a cable ready tuner such as one
in your VCR or cable ready TV you can recieve ATV on 434 on ch
56...( I think..or 59).

You have to connect an outside antenna to the cable input of your
VCR. The antenna should be a direction type.

One problem. The tuner in your VCR is not as sensitive as the
downconverters for ATV. The signal in your area should be a
strong one such as from a repeater or a close friend. Give it a
try anyhow, that is what amature radio is all about!

-------------------------000000-------------------------------
Steve N0FPF ---Seattle....Hams should be seen as well as heard!
                          Western Washington Amateur Television.


From [e-mail] Thu Aug 10 15:33:04 1995
Path: grape.epix.net!sc2c526a.ra.osd.mil!nova.sti.nasa.gov!lerc.nasa.gov!magnus.acs.ohio-state.edu!math.ohio-state.edu!howland.reston.ans.net!newsfeed.internetmci.com!uunet!in2.uu.net!tetsuo.communique.net!tony
From: [e-mail] (Tony Salvador)
Newsgroups: rec.radio.amateur.homebrew
Subject: ATV website ?? Where !
Date: Wed, 09 Aug 95 19:47:39 GMT
Organization: g. c. r. & associates, inc.
Lines: 4
Distribution: world
Message-ID: <40b3d6$[e-mail]>
NNTP-Posting-Host: tony.gcr1.com
X-Newsreader: News Xpress Version 1.0 Beta #2.1

Someone listed a WWW homepage or website for ATV operators ...?
I'm looking for it ...
let me know where it is  ...



From [e-mail] Thu Aug 10 15:33:05 1995
Path: grape.epix.net!sc2c526a.ra.osd.mil!nova.sti.nasa.gov!lerc.nasa.gov!magnus.acs.ohio-state.edu!math.ohio-state.edu!cs.utexas.edu!swrinde!tank.news.pipex.net!pipex!howland.reston.ans.net!ix.netcom.com!netnews
From: [e-mail] (michael silva)
Newsgroups: rec.radio.amateur.homebrew
Subject: Boiled Torroid? (was Re: VFO Stability)
Date: 8 Aug 1995 01:15:53 GMT
Organization: Netcom
Lines: 14
Message-ID: <406ds9$[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: ix-val-ca1-02.ix.netcom.com

In <[e-mail]> [e-mail] (John Seboldt)
writes:
>.... This is after boiling the toroid (which helped)....

OK, I'll bite (sorry...), does this really refer to dropping a core in
boiling water, or is it shorthand for something entirely different.  I
*can* imagine that heating up a toroid might do some kind of molecular
realignment or something to reduce the temp. drift, but I can also
imagine giving a lot of amusement to a lot of people by doing so, so
which is it?

73,
Mike, KK6GM



From [e-mail] Thu Aug 10 15:33:06 1995
Path: grape.epix.net!news.sprintlink.net!news.primenet.com!ip218.phx.primenet.com!markem
From: [e-mail] (Mark Monninger)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Boiled Torroid? (was Re: VFO Stability)
Date: Mon, 7 Aug 1995 20:06:23 MST
Organization: Primenet
Lines: 18
Message-ID: <[e-mail]>
References: <[e-mail]> <406ds9$[e-mail]>
NNTP-Posting-Host: ip218.phx.primenet.com
X-Newsreader: Trumpet for Windows [Version 1.0 Rev B final beta #4]

In article <406ds9$[e-mail]> [e-mail] (michael
silva) writes:>In <[e-mail]> [e-mail] (John
Seboldt)>writes:
>>.... This is after boiling the toroid (which helped)....

>OK, I'll bite (sorry...), does this really refer to dropping a core in
>boiling water, or is it shorthand for something entirely different.  I
>*can* imagine that heating up a toroid might do some kind of molecular
>realignment or something to reduce the temp. drift, but I can also
>imagine giving a lot of amusement to a lot of people by doing so, so
>which is it?

Actually, I think it anneals the copper wire wound on the toroid and makes the
windings less likely to move and change the inductance of the assembly.
Doesn't actually affect the toroid, although they can be affected by high
temps but I think it takes much higher than 100C.

Mark    AA7TA


From [e-mail] Thu Aug 10 15:33:07 1995
Newsgroups: rec.radio.amateur.homebrew
Path: grape.epix.net!sc2c526a.ra.osd.mil!nova.sti.nasa.gov!lerc.nasa.gov!magnus.acs.ohio-state.edu!math.ohio-state.edu!usc!howland.reston.ans.net!ix.netcom.com!netcom.com!rohrwerk
From: [e-mail] (John Seboldt)
Subject: Re: Boiled Torroid? (was Re: VFO Stability)
Message-ID: <[e-mail]>
Organization: NETCOM On-line Communication Services (408 261-4700 guest)
References: <[e-mail]> <406ds9$[e-mail]>
Date: Tue, 8 Aug 1995 03:26:19 GMT
Lines: 26
Sender: [e-mail]

[e-mail] (michael silva) writes:

>In <[e-mail]> [e-mail] (John Seboldt)
>writes:
>>.... This is after boiling the toroid (which helped)....

>OK, I'll bite (sorry...), does this really refer to dropping a core in
>boiling water, or is it shorthand for something entirely different.  I

>73,
>Mike, KK6GM

Yep, boiling water indeed!  Complete with winding.  Supposedly this also
helps relieve winding stresses by expanding/contracting.  It helped some.

Thanks for the replies, folks.  The consensus very much goes with
AIR-CORE COILS for the best VFO stability.  Ceramic forms are best, with
glass tubing and acrylic rod also possibilities.  Toroids are a
compromise for compactness at best, which may work OK at lower
frequencies, but they don't have the temp. stability of air core coils.

: John Seboldt  [e-mail]  / CW:  It don't mean a thing
:       Amateur radio K0JD...       /  if it ain't got that swing!
:    Church of the Annunciation,   / Di dah, di d╪h, di dah, di dah...
:           Minneapolis           /           (sorry, Duke!)



From [e-mail] Thu Aug 10 15:33:07 1995
Path: grape.epix.net!sc2c526a.ra.osd.mil!nova.sti.nasa.gov!lerc.nasa.gov!purdue!haven.umd.edu!news.umbc.edu!eff!news.duke.edu!zombie.ncsc.mil!news.gmi.edu!usenet.eel.ufl.edu!newsfeed.internetmci.com!uunet!in2.uu.net!news.sandia.gov!tesuque.cs.sandia.gov!ferrari.mst6.lanl.gov!newshost.lanl.gov!usenet
From: Jim Devenport <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Can Schems/Diags be Posted here? *.uue??
Date: 8 Aug 1995 23:33:38 GMT
Organization: Los Alamos National Laboratory
Lines: 15
Message-ID: <408s8i$[e-mail]>
References: <3vhpu2$[e-mail]> <3vrrgv$[e-mail]> <4056g4$[e-mail]>
NNTP-Posting-Host: jdport.lanl.gov
Mime-Version: 1.0
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X-Mailer: Mozilla 1.1N (Windows; I; 16bit)

How can a homebrew "discussion group" be solely limited to
discussion only?  A shematic or 2 would be much better
return on the money cost of "every byte coming thru the
modem" than most "discussion" that goes on in most groups.
I don't think it would be rude at all, but then, I don't
think it's rude or unspeakable to list commercial ads on
the Internet either, so don't pay any attention to ME..

--
*********** Jim Devenport WB5AOX **************
*      PO Box 445, McIntosh NM 87032          *
*        http://nis-www.lanl.gov/~jdport/     *
***********************************************




From [e-mail] Thu Aug 10 15:33:08 1995
Path: grape.epix.net!sc2c526a.ra.osd.mil!nova.sti.nasa.gov!lerc.nasa.gov!purdue!haven.umd.edu!hecate.umd.edu!mojo.eng.umd.edu!bloom-beacon.mit.edu!gatech!howland.reston.ans.net!news.sprintlink.net!nuclear.microserve.net!pinetree
From: [e-mail] (WB3U)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Can Schems/Diags be Posted here? *.uue??
Date: Wed, 09 Aug 95 05:51:08 GMT
Organization: Microserve Information Systems (800)-380-INET
Lines: 19
Distribution: world
Message-ID: <409j4a$[e-mail]>
References: <3vhpu2$[e-mail]> <3vrrgv$[e-mail]> <4056g4$[e-mail]> <408s8i$[e-mail]>
NNTP-Posting-Host: pinetree.microserve.com
X-Newsreader: News Xpress Version 1.0 Beta #4

   Jim Devenport <[e-mail]> wrote:

>How can a homebrew "discussion group" be solely limited to
>discussion only?  A shematic or 2 would be much better
>return on the money cost of "every byte coming thru the
>modem" than most "discussion" that goes on in most groups.
>I don't think it would be rude at all, but then, I don't
>think it's rude or unspeakable to list commercial ads on
>the Internet either, so don't pay any attention to ME..

I agree, and I have occasionally posted a schematic or two here
when e-mail indicated that a number of people were interested.

Given that it doesn't occur very often, I don't think it's worth
worrying about.

73,

Jack  WB3U


From [e-mail] Thu Aug 10 15:33:09 1995
Path: grape.epix.net!sc2c526a.ra.osd.mil!nova.sti.nasa.gov!lerc.nasa.gov!magnus.acs.ohio-state.edu!freenet.columbus.oh.us!pacific.mps.ohio-state.edu!math.ohio-state.edu!cs.utexas.edu!not-for-mail
From: [e-mail] (Muenzler, Kevin)
Newsgroups: rec.radio.amateur.homebrew
Subject: Can Schems/Diags be Posted here? *.uue??
Date: 9 Aug 1995 09:24:18 -0500
Organization: UTexas Mail-to-News Gateway
Lines: 32
Sender: [e-mail]
Message-ID: <[e-mail]>
NNTP-Posting-Host: news.cs.utexas.edu

[e-mail] (WB3U) Writes:
>
>
<snip>
>I agree, and I have occasionally posted a schematic or two here
>when e-mail indicated that a number of people were interested.
>
>Given that it doesn't occur very often, I don't think it's worth
>worrying about.
>
>73,
>
>Jack  WB3U

The problem with posting binary/UUEncoded files here is not the
fact that occasional posting "isn't worth worrying about."  The problem
is that this group as well as several others in the rec.radio.amateur.*
section of USENET are picked up by a USENET to EMail reflector
at the University of California at San Diego.  The articles are gathered
and placed into digests and sent to thousands of people via EMail.
If this was not the case and it simply showed up on a USENET reader
as a topic that could be ignored there would not be much of a problem.
If someone posts a UUEncoded file here that is 50K and it is duplicated,
say 2000 times, that is 100MB of space that is taken up by ONE post.
That is why I don't recommend posting UUEncoded files here.  If you have
one post it to one of the binary newgroups and notify us of its existence
by posting an article telling us where it is.

Thanks

Kevin Muenzler, WB5RUE
[e-mail]


From [e-mail] Thu Aug 10 15:33:10 1995
Path: grape.epix.net!news.sprintlink.net!howland.reston.ans.net!agate!!tvr
From: [e-mail] (Tovar)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Can Schems/Diags be Posted here? *.uue??
Date: 09 Aug 1995 18:10:07 GMT
Organization: CNMAT
Lines: 19
Message-ID: <[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: les.cnmat.berkeley.edu
In-reply-to: [e-mail]'s message of 9 Aug 1995 09:24:18 -0500

    If someone posts a UUEncoded file here that is 50K and it is duplicated,
    say 2000 times, that is 100MB of space that is taken up by ONE post.
    That is why I don't recommend posting UUEncoded files here.  If you have
    one post it to one of the binary newgroups and notify us of its existence
    by posting an article telling us where it is.

Or, you can put on a WWW or FTP server, and include a URL or pathname in
your posting.  If you ask nicely, there are many folks out here with WWW
pages who would be happy to include your schematics and drawings, along
with the original text.  One of the High Speed Packet pages already has
a number of schematics on it, and it is very useful.

We could also request that 'alt.binary.radio.amateur' be created, i don't
see much trouble getting that through 'alt.config'.  Now, of course, not
everyone can get 'alt.binary' as much of the material posted there is
considered (depending on the site) to either consume very excessive
amounts of disk or to be too controversial to be anything more than an
"upon request" basis...
                                -- KD6PAG


From [e-mail] Thu Aug 10 15:33:11 1995
Path: grape.epix.net!sc2c526a.ra.osd.mil!nova.sti.nasa.gov!lerc.nasa.gov!magnus.acs.ohio-state.edu!math.ohio-state.edu!cs.utexas.edu!news.sprintlink.net!nuclear.microserve.net!pinetree
From: [e-mail] (WB3U)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Can Schems/Diags be Posted here? *.uue??
Date: Wed, 09 Aug 95 22:19:18 GMT
Organization: Microserve Information Systems (800)-380-INET
Lines: 13
Distribution: world
Message-ID: <40bd1d$[e-mail]>
References: <[e-mail]> <[e-mail]>
NNTP-Posting-Host: pinetree.microserve.com
X-Newsreader: News Xpress Version 1.0 Beta #4

   [e-mail] (Tovar) wrote:
> If someone posts a UUEncoded file here that is 50K and it is
> duplicated, say 2000 times, that is 100MB of space that is taken up
> by ONE post.  That is why I don't recommend posting UUEncoded files
> here.

I don't understand this.  If someone posts a 50K UUE binary to this
group, it takes up 50K on the news server I subscribe to.  If it
also takes up 50K on other servers as well, how does that impact me?

Just asking.

Jack  WB3U


From [e-mail] Thu Aug 10 15:33:11 1995
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From: Jim Strohm <jstrohm@blazer>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Can Schems/Diags be Posted here? *.uue??
Date: 10 Aug 1995 15:24:09 GMT
Organization: UniSQL, Inc.
Lines: 26
Message-ID: <40d8ap$[e-mail]>
References: [e-mail]> <[e-mail]> <40bd1d$[e-mail]>
NNTP-Posting-Host: blazer.unisql.com
X-Newsreader: NCSA Mosaic

WB3U writes:

>    If someone posts a 50K UUE binary to this
> group, it takes up 50K on the news server I subscribe to.  If it
> also takes up 50K on other servers as well, how does that impact me?
>

Jack, it affects you the same way as if one guy drops a 2KW carrier
on 14.313, then 2,000 other hams pile onto 14.313 with 2KW carriers.

Even if you're not trying to use 14.313 at the time, it messes up the band
for anybody anywhere nearby.  The bandwidth -- the capacity for the
medium to pass information -- is overtaken by one kind of information that
is not useful to all the users, and is not available to other users for any
exchange of information.  It's called "wasted bandwidth" and it squanders a
finite resource.

It probably doesn't affect you DIRECTLY -- except that you might QSY to 40,
or turn on the TV.  But until the noise subsides, or the 2,000 copies of the
program get deleted, it takes up more space than it should, space that may
be put to a better use.

Jim N6OTQ
standard disclaimer




From [e-mail] Thu Aug 10 15:33:12 1995
Path: grape.epix.net!sc2c526a.ra.osd.mil!nova.sti.nasa.gov!lerc.nasa.gov!news.larc.nasa.gov!lll-winken.llnl.gov!uwm.edu!spool.mu.edu!howland.reston.ans.net!newsjunkie.ans.net!butch!news
From: [e-mail] (Anthony D'Ercole)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: direct digital synthesis
Date: 9 Aug 1995 13:06:24 GMT
Organization: Lockheed Aeronautical Systems Company
Lines: 11
Message-ID: <40absg$[e-mail]>
References: <3vm5kk$[e-mail]>
Reply-To: [e-mail]
NNTP-Posting-Host: rtm13.lasc.lockheed.com
Summary: TS-440 Rs232 Command Set

I would like to interface my TS-440 to my personal Computer.  Does anyone
out there have the Command/Response set.  I have the data to interface
electrically but the software interface is a mystery.  I can not find
it documented anywhere.  If you can shed some light either post here or
email me directly at:

[e-mail]






From [e-mail] Thu Aug 10 15:33:13 1995
Newsgroups: rec.radio.amateur.homebrew
Path: grape.epix.net!sc2c526a.ra.osd.mil!nova.sti.nasa.gov!lerc.nasa.gov!purdue!news.bu.edu!bloom-beacon.mit.edu!news.starnet.net!wupost!news.utdallas.edu!corpgate!bcarh189.bnr.ca!nott!cunews!freenet.carleton.ca!FreeNet.Carleton.CA!bk296
From: [e-mail] (Gordon Symonds)
Subject: FM Stereo Wireless Microphone
Message-ID: <[e-mail]>
Sender: [e-mail] (Gordon Symonds)
Reply-To: [e-mail] (Gordon Symonds)
Organization: The National Capital FreeNet
Date: Thu, 10 Aug 1995 11:29:13 GMT
Lines: 5


I would like to buy or build an FM stereo wireless mike: L+R audio inputs,
a range of about 10' and a power supply of 12 VDC or less.  Any leads
or assistance appreciated.



From [e-mail] Thu Aug 10 15:33:14 1995
Path: grape.epix.net!sc2c526a.ra.osd.mil!nova.sti.nasa.gov!lerc.nasa.gov!magnus.acs.ohio-state.edu!math.ohio-state.edu!uwm.edu!cs.utexas.edu!news.sprintlink.net!newsfeed.internetmci.com!lamarck.sura.net!news.uky.edu!chuck
From: [e-mail] (Terry Fugate)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: FM Stereo Wireless Microphone
Date: 10 Aug 1995 13:02:47 GMT
Organization: IT
Lines: 16
Message-ID: <40d01n$[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: 128.163.13.56
X-Newsreader: WinVN 0.92.6

In article <[e-mail]>, [e-mail] (Gordon Symonds) says:
>
>
>I would like to buy or build an FM stereo wireless mike: L+R audio inputs,
>a range of about 10' and a power supply of 12 VDC or less.  Any leads
>or assistance appreciated.
>
You might try your local Kmart or Walmart.  I have seen a small FM stereo
tx that they sell.  It is desinged to take your portable CD player and
"bradcast" it into you car stereo.  I suspect that you could go inside
it and add a preamp to boast a microphone level to a line level.
There might be a "pad" to reduce the level from line/earphone to
approaching microphone level.  The mini tx's were pretty cheap..
like maybe $20.00
Good luck and let us know how it works
Terry Fugate


From [e-mail] Thu Aug 10 15:33:14 1995
Newsgroups: rec.radio.amateur.homebrew
Path: grape.epix.net!sc2c526a.ra.osd.mil!nova.sti.nasa.gov!lerc.nasa.gov!magnus.acs.ohio-state.edu!freenet.columbus.oh.us!pacific.mps.ohio-state.edu!math.ohio-state.edu!howland.reston.ans.net!newsfeed.internetmci.com!uunet!in1.uu.net!fonorola!news.compulink.com!abyss!lethe!gts!westonia!ppp-1
From: [e-mail] (Joseph Cooper)
Subject: Gyrator Curcuit design
Message-ID: <[e-mail]>
Sender: [e-mail]
Nntp-Posting-Host: ppp-1.ppp.westonia.com
Organization: Westonia
X-Newsreader: News Xpress Version 1.0 Beta #3
Date: Sun, 6 Aug 1995 22:45:33 GMT
Lines: 25

I am looking for information on a method of curcuit design call the 'Gyrator'.
 What is of interest is that the design uses resistance, rather than
inductance, to create impedance.

What the basic cuircuit looks like is a group of resistors in series of the
same value with one capacitor in that series line.

For an example of a curcuit using 5 resistors, the formula for calculating
inductance would be
 L=

 R1 R3 R5
----------
 R2 1/C1

I've seen some very technical references to this in my searches, but nothing
basic enough to be able to work with.The value of this information would be
for low frequency work (160 and 80 meters).

Thanks in advance

Joe
Ve3FMQ




From [e-mail] Thu Aug 10 15:33:15 1995
Path: grape.epix.net!sc2c526a.ra.osd.mil!nova.sti.nasa.gov!lerc.nasa.gov!magnus.acs.ohio-state.edu!math.ohio-state.edu!howland.reston.ans.net!vixen.cso.uiuc.edu!sdd.hp.com!hpscit.sc.hp.com!rkarlqu
From: [e-mail] (Richard Karlquist)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Gyrator Curcuit design
Date: 8 Aug 1995 22:25:42 GMT
Organization: Hewlett-Packard
Lines: 45
Message-ID: <408o96$[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: hpscrj.scd.hp.com

In article <[e-mail]>, Joseph Cooper <[e-mail]> wrote:
>I am looking for information on a method of curcuit design call the 'Gyrator'.
> What is of interest is that the design uses resistance, rather than
>inductance, to create impedance.
>
>What the basic cuircuit looks like is a group of resistors in series of the
>same value with one capacitor in that series line.
>
>For an example of a curcuit using 5 resistors, the formula for calculating
>inductance would be
> L=
>
> R1 R3 R5
>----------
> R2 1/C1
>
>I've seen some very technical references to this in my searches, but nothing
>basic enough to be able to work with.The value of this information would be
>for low frequency work (160 and 80 meters).
>
>Thanks in advance
>
>Joe
>Ve3FMQ

There are two related gyrators that have 5 passives in series, plus
2 op amps tapped into the string at intermediate points.  They are
usually called the Bruton and Antoniou gyrators and are based on
work by Riordan.  (See references at end).  The best treatment of these
that I have seen is in Sedra and Brackett's book on active circuits.
I would warn you that you need a GBW product in the op amps on the
order of 100 times the product of Q and frequency, so that at 160
meters, you should be looking at 200 MHz op amps like the OPA620 or
even more.  Also, I have not seen any "basic" treatments of this
complicated topic in my extensive literature searches for gyrators.
Perhaps you should go back to passive inductors.

References:

Antoniou:  Proc. IEE, Nov. 69, pp 1838-1850.
Bruton:  IEEE Trans. Circuit Theory, Aug. 69, pp 406-408
Riordan:  Elec. Letters, 1967, pp 50-51.

Rick Karlquist N6RK
[e-mail]


From [e-mail] Thu Aug 10 15:33:16 1995
Path: grape.epix.net!sc2c526a.ra.osd.mil!nova.sti.nasa.gov!lerc.nasa.gov!magnus.acs.ohio-state.edu!math.ohio-state.edu!howland.reston.ans.net!cs.utexas.edu!geraldo.cc.utexas.edu!mickey.cc.utexas.edu!vcl
From: [e-mail] (Victor C. Limary)
Newsgroups: sci.electronics,rec.radio.amateur.equipment,rec.radio.amateur.homebrew
Subject: Help!  Need schematics for FM Transmitter
Date: 8 Aug 1995 18:44:02 GMT
Organization: The University of Texas at Austin, Austin, Texas
Lines: 11
Message-ID: <408b9i$[e-mail]>
NNTP-Posting-Host: mickey.cc.utexas.edu
X-Newsreader: TIN [version 1.2 PL2]
Xref: grape.epix.net sci.electronics:138825 rec.radio.amateur.equipment:15552 rec.radio.amateur.homebrew:8808

  Hi.  I was wondering if anyone had schematics for a small FM transmitter.
I need to design a wireless FM microphone for a school project.  It needs to
be capable to transmitting to at least 20 feet away, to an ordinary FM
receiver.  E-mails would be appreciated, but I will check the newsgroups.

Thanks!

--
Victor Limary                      |The University of Texas at Austin
[e-mail]             |http://ccwf.cc.utexas.edu/~vcl/
                                   |http://www.utexas.edu/students/alphachi/


From [e-mail] Thu Aug 10 15:33:17 1995
Path: grape.epix.net!news.sprintlink.net!news.interserv.net!usenet
From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: HF Amp transformer
Date: 9 Aug 1995 23:32:08 GMT
Organization: InterServ News Service
Lines: 7
Message-ID: <40bgho$[e-mail]>
NNTP-Posting-Host: 164.117.225.116
X-Newsreader: AIR News 3.X (SPRY, Inc.)

Saw a few articals on using micro-wave oven transformers for HF Amps. I am very interested if these transformers
can actually be used.  Has anyone actually used one of these in an HF amp?? If any own has any information
on this please let me now, I have access to a large qty of used micro-wave oven transformers and would be willing
to provide for the shipping price only.  If you have any infor please e-mail me at

[e-mail]



From [e-mail] Thu Aug 10 15:33:18 1995
Newsgroups: rec.radio.amateur.homebrew
Path: grape.epix.net!sc2c526a.ra.osd.mil!nova.sti.nasa.gov!lerc.nasa.gov!magnus.acs.ohio-state.edu!math.ohio-state.edu!cs.utexas.edu!swrinde!emory!cssun.mathcs.emory.edu!wa4mei!ke4zv!gary
From: [e-mail] (Gary Coffman)
Subject: Re: HF Amp transformer
Message-ID: <[e-mail]>
Reply-To: [e-mail] (Gary Coffman)
Organization: Destructive Testing Systems
References: <40bgho$[e-mail]>
Date: Thu, 10 Aug 1995 15:20:44 GMT
Lines: 19

In article <40bgho$[e-mail]> [e-mail] writes:
>Saw a few articals on using micro-wave oven transformers for HF Amps. I am very interested if these transformers
>can actually be used.  Has anyone actually used one of these in an HF amp?? If any own has any information
>on this please let me now, I have access to a large qty of used micro-wave oven transformers and would be willing
>to provide for the shipping price only.  If you have any infor please e-mail me at
>
>[e-mail]

AFAIK, microwave oven transformers are designed to saturate at the
maggie design current, acting as a crude current regulator and peak
current limiter. This probably isn't behavior you'd want from a linear
amplifier supply.

Gary
--
Gary Coffman KE4ZV          |    You make it,     | gatech!wa4mei!ke4zv!gary
Destructive Testing Systems |    we break it.     | emory!kd4nc!ke4zv!gary
534 Shannon Way             |    Guaranteed!      | [e-mail]
Lawrenceville, GA 30244     |                     |


From [e-mail] Thu Aug 10 15:33:18 1995
Path: grape.epix.net!news.sprintlink.net!howland.reston.ans.net!usc!crash!pebble!kurt.prochnow
From: [e-mail] (Kurt Prochnow)
Date: 08 Aug 95 09:41:20
Newsgroups: rec.radio.amateur.homebrew
Subject: Info. on Palomar
Message-ID: <[e-mail]>
X-FTN-To: Guy Scott
Organization: Pebble Gateway
Lines: 10

Palomar Engineers
Box 462222
Escondido, California 92046

619-747-3343
619-747-3346 (fax)

--
Any opinions expressed by this user are theirs and theirs alone.
Pebble in the Sky - Escondido, CA - 619-743-2511 - V.34+


From [e-mail] Thu Aug 10 15:33:19 1995
Path: grape.epix.net!sc2c526a.ra.osd.mil!nova.sti.nasa.gov!lerc.nasa.gov!magnus.acs.ohio-state.edu!math.ohio-state.edu!usc!howland.reston.ans.net!swrinde!sgigate.sgi.com!genmagic!bug.rahul.net!a2i!news.erinet.com!uunet!in2.uu.net!spcuna!news.columbia.edu!watsun.cc.columbia.edu!jbaltz
From: [e-mail] (Jerry B Altzman)
Newsgroups: rec.radio.amateur.homebrew
Subject: July QEX
Date: 8 Aug 1995 04:44:06 GMT
Organization: double ionizers association
Lines: 5
Message-ID: <406q2m$[e-mail]>
NNTP-Posting-Host: watsun.cc.columbia.edu

Has anyone received their July QEX yet? I'm still waiting for mine...

//jbaltz
jerry b. altzman   Entropy just isn't what it used to be      [phone]
[e-mail]   [e-mail]  KE3ML  (HEPNET) NEVIS::jbaltz


From [e-mail] Thu Aug 10 15:33:19 1995
Path: grape.epix.net!sc2c526a.ra.osd.mil!nova.sti.nasa.gov!lerc.nasa.gov!purdue!news.bu.edu!bloom-beacon.mit.edu!newsfeed.internetmci.com!news.sprintlink.net!news.azstarnet.com!usenet
From: Wes Stewart <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: July QEX
Date: 9 Aug 1995 02:06:38 GMT
Organization: Arizona Daily Star - AZSTARNET
Lines: 10
Message-ID: <40957e$[e-mail]>
References: <406q2m$[e-mail]>
NNTP-Posting-Host: sprite40.azstarnet.com
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 1.2b2 (Windows; I; 16bit)
To: [e-mail]

[e-mail] (Jerry B Altzman) wrote:
>Has anyone received their July QEX yet? I'm still waiting for mine...
>
>//jbaltz
>jerry b. altzman   Entropy just isn't what it used to be      [phone]
>[e-mail]   [e-mail]  KE3ML  (HEPNET) NEVIS::jbaltz


Nope!



From [e-mail] Thu Aug 10 15:33:20 1995
Path: grape.epix.net!sc2c526a.ra.osd.mil!nova.sti.nasa.gov!lerc.nasa.gov!purdue!haven.umd.edu!news.umbc.edu!hookup!usenet.eel.ufl.edu!newsfeed.internetmci.com!news.sprintlink.net!howland.reston.ans.net!news-e1a.megaweb.com!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail
From: [e-mail] (KE4IOF)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: July QEX
Date: 9 Aug 1995 08:36:01 -0400
Organization: America Online, Inc. (1-800-827-6364)
Lines: 3
Sender: [e-mail]
Message-ID: <40aa3h$[e-mail]>
References: <40957e$[e-mail]>
NNTP-Posting-Host: newsbf02.mail.aol.com
X-Newsreader: AOL Offline Reader

I haven't either. My June issue was late too.

Mark


From [e-mail] Thu Aug 10 15:33:21 1995
Path: grape.epix.net!sc2c526a.ra.osd.mil!nova.sti.nasa.gov!lerc.nasa.gov!magnus.acs.ohio-state.edu!math.ohio-state.edu!jussieu.fr!univ-lyon1.fr!swidir.switch.ch!scsing.switch.ch!news.belwue.de!news.dfn.de!RRZ.Uni-Koeln.DE!wmwap1.math.uni-wuppertal.de!schneide
From: [e-mail] (Robert J. Schneider)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: July QEX
Date: 9 Aug 1995 11:22:52 GMT
Organization: University of Wuppertal
Lines: 11
Message-ID: <40a5qc$[e-mail]>
References: <406q2m$[e-mail]> <40957e$[e-mail]>
NNTP-Posting-Host: wrds15.urz.uni-wuppertal.de
X-Newsreader: TIN [version 1.2 PL2]

Wes Stewart ([e-mail]) wrote:
: [e-mail] (Jerry B Altzman) wrote:
: >Has anyone received their July QEX yet? I'm still waiting for mine...
: >
: >//jbaltz
: >jerry b. altzman   Entropy just isn't what it used to be      [phone]
: >[e-mail]   [e-mail]  KE3ML  (HEPNET) NEVIS::jbaltz


: Nope!
Also not!


From [e-mail] Thu Aug 10 15:33:22 1995
Path: grape.epix.net!news.sprintlink.net!uunet!in2.uu.net!spcuna!news.columbia.edu!watsun.cc.columbia.edu!jbaltz
From: [e-mail] (Jerry B Altzman)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: July QEX
Date: 9 Aug 1995 16:30:11 GMT
Organization: double ionizers association
Lines: 14
Message-ID: <40anqj$[e-mail]>
References: <406q2m$[e-mail]>
NNTP-Posting-Host: watsun.cc.columbia.edu

In article <406q2m$[e-mail]>,
I <[e-mail]> wrote:
>Has anyone received their July QEX yet? I'm still waiting for mine...

I just called the ARRL about 3 minutes ago. They said that "the July QEX
went out *this morning*" (9 Aug 1995) to which I replied "ahh, well the July
QEX is now the August QEX, no?" and I was answered, "the August QEX will be
coming out shortly"

So there you go!

//jbaltz
jerry b. altzman   Entropy just isn't what it used to be      [phone]
[e-mail]   [e-mail]  KE3ML  (HEPNET) NEVIS::jbaltz


From [e-mail] Thu Aug 10 15:33:24 1995
Path: grape.epix.net!sc2c526a.ra.osd.mil!nova.sti.nasa.gov!lerc.nasa.gov!magnus.acs.ohio-state.edu!math.ohio-state.edu!usc!howland.reston.ans.net!agate!!tvr
From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Longwave Transmitter
Date: 08 Aug 1995 02:24:56 GMT
Organization: CNMAT
Lines: 84
Distribution: world
Message-ID: <[e-mail]>
References: <3vpd7v$[e-mail]> <3vovg7$[e-mail]>
        <[e-mail]>
NNTP-Posting-Host: boulez.cnmat.berkeley.edu
In-reply-to: [e-mail]'s message of Fri,  4 Aug 1995 00:23:00 GMT

I'm NOT an expert on the 'lowfer' band, i'm just learning about it myself.
Hopefully, an active 'lowfer' can answer these questions more authoratively.
However, i can clear a few things up.

    From the article "Ground Zero"  (Popular Electronics-Oct.'94):

    1750-Meter Experimenters' Band:
    - 160-190 kHz          - Max. power-1watt
    - Max. antenna length-50 ft. including ground lead and transmission line
    - Modulation-any
    - Out of band emissions must be supressed by 20 dB.

I have that one quoted in my WWW page simply because it contains a magazine
reference.  50 ft is approximately 15 meters, as later posters have noted.

    I don't care what THAT book said. It was either a misprint or a typo on
    your part....
    because I respectfully must imform all that the limit of the combined
    feedline and antenna
    system for transmitting can only be a maximum of 15 (fifteen) feet.

No, it is 15 meters.

    (b) The total length of the transmission line, antenna, and
    ground lead (if used) shall not exceed 15 meters.
                        [Sec. 15.217:  Operation in the band 160-190 kHz.]

    Reference:
        http://www.pls.com:8001/cgi-bin/taos_doc.pl?unix+1+cfr+187927+query+%27Sec.+15.217%27%3acite+%25BREAK%25+cfr%3a
        (or type "'Sec. 15.217':cite" at http://www.pls.com:8001/his/cfr.html )

Someone asked about IDs:

    It is also interesting that you literally can make up your own callsign/id
    on there (trying not to duplicate an existing one) If you are allready a
    ham you can use your call as it is very unlikely
    that it is allready being used on vlf! Most IDs are 3 letters in lenght in
    the entire vlf band.

I don't have the reference nearby, but i understand that the 'lowfer' folk
use their callsign suffix.  (I'm not sure what Advanced, Extra and folks
with "by 1" calls use.)

    I wouldn't use an amateur call as the transmissions are clearly
    out of any amateur band.

Exactly, and that's the reason for the callsign suffix convention.  So, if
i were to operate there, i would use PAG to identify and explain to anyone
who asked that my amateur callsign is KD6PAG for purposes of providing a
convenient mailing address and operating under Part 15.

    If you live near salt water, use it as a ground and place the x-mitter
    directly at
    the base of the antenna. The vertical portion would then be 15 feet (
    constructed with a copper ribbon/tubing or multi-wire to compensate for
    R-loss) with a large capacity hat to bring the resonance down as far as
    possible without having the outer perimeter of the capacity hat fall below
    20% of the vertical portion of the antennas' vertical mast

I'm not sure what the 15 meters means.  For example, i don't know whether
it could be something like a 14 foot ferrite-rod with a 1 foot ground rod,
both connected directly to the transmitter.  That may be a "gray area" in
the regulations.  On the other hand, if you keep things real clean and
don't annoy anyone, the question won't come up. (Of course, if you have a
horrendously large receiving antenna, which is perfectly legal, non-hams
won't know the difference, and questions might get asked.)

If you're seriously interested, here's a useful reference:

    The monthly newsletter is called "The Lowdown" and is published
    by Bill Oliver, 45 Wildflower Road, Levittown, PA 19057.  The cost is
    $15 a year.  It cover all lowfer, medfer, and other interest in the VLF
    area.  I find it to be quite interesting.  Also, there is a couple of
    different systems available for computer operated beacons.  A lot of
    activity in all areas of the country.  Some are hams and other seem to
    be engineering types. I am in the process of building a station now.
                        [[e-mail] (Dale A. Hagert),  23 Apr 1995]

Have a good time, but behave yourself.

                                -- KD6PAG  (who is still learning)

P.S.  I'm still looking for a local (S.F. Bay Area) 'lowfer' to help me
get started someday.


From [e-mail] Thu Aug 10 15:33:25 1995
Path: grape.epix.net!sc2c526a.ra.osd.mil!nova.sti.nasa.gov!lerc.nasa.gov!purdue!haven.umd.edu!news.umbc.edu!eff!news.duke.edu!zombie.ncsc.mil!simtel!noc.netcom.net!news.sprintlink.net!uunet!in1.uu.net!news.sandia.gov!tesuque.cs.sandia.gov!ferrari.mst6.lanl.gov!newshost.lanl.gov!usenet
From: Jim Devenport <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: looking for plans: CB base antenna
Date: 8 Aug 1995 23:27:26 GMT
Organization: Los Alamos National Laboratory
Lines: 58
Message-ID: <408rsu$[e-mail]>
References: <40335t$[e-mail]>
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To: [e-mail]


I built several of these for 10 meters, but they will work
equally well on 11 meters (if your kid enjoys the CB he is
twisted beyond belief, get him a Novice or Tech ham radio
license guidebook from Radio Shack):

                 |   ^
                 |   |
                 |   |
                 |   |
                 |  length: 103" CB or 99" for 10 meter ham
                 |   |
                 |   |
(aluminum tubing |   |
 or 1/2" galv.   |   |
 elect. conduit) |   |
                 |   -
                 T < insulator: block of wood or plastic
                 I   -clamp vert. element to insulator with
                 I   steel hose clamp(s)
    ___________________________
    < 4 radials ea. 103" long >
        (side view of antenna)


                    |
                    |
                    |
                    |
                    | Attach coax shield to radials
                    ^/
            -------/o\-------
                   \ /\
                    T  Attach coax center conductor to vert
                    |  element, may clamp under hose clamp
                    |
                    |
                    |

MAke the center plate of aluminum or whatever you have
handy, 6 to 12 inches square will suffice.  Attach the
4 radials to  the center plate with screws and nuts for
a good mechanical and electrical connection.  The
Center vertical element MUST be insulated from the
radials (horizontal elements).
This antenna will support itself just sitting on a flat
roof or other surface, even out in the back/front yard on
the ground.
The higher you can get it of course the better it will
perform - as with ANY antenna.

--
*********** Jim Devenport WB5AOX **************
*      PO Box 445, McIntosh NM 87032          *
*        http://nis-www.lanl.gov/~jdport/     *
***********************************************




From [e-mail] Thu Aug 10 15:33:26 1995
Path: grape.epix.net!news.sprintlink.net!howland.reston.ans.net!swrinde!elroy.jpl.nasa.gov!sdd.hp.com!svc.portal.com!shell.portal.com!jobe.shell.portal.com!jkesling
From: [e-mail] (John Darrell Kesling)
Newsgroups: rec.radio.amateur.homebrew
Subject: MDS downconverters good for parts?
Date: 9 Aug 1995 21:40:02 GMT
Organization: Portal Communications Company -- 408/973-9111 (voice) 408/973-8091 (data)
Lines: 23
Message-ID: <40b9vi$[e-mail]>
NNTP-Posting-Host: jobe.shell.portal.com
X-Newsreader: TIN [version 1.2 PL2]

I recently obtained several MDS downconverters.  I believe they had
been used by a now defunct local business to provide direct to your
home premium TV broadcasts.

They have an "N" connector input and two "F" connectors for output, one
is labled "test" the other "TV".   They are labled "INPUT MDS CHANNEL 1"
and "OUTPUT CHANNEL 3".  They are obviously designed to be mast mounted.
They appear to have a preamp built in as well as a crystal controlled
oscillator and mixer stages.

Does anyone know the frequency of MDS CHANNEL 1?

Should they be scrapped for parts, converted to another frequency,
used as-is or thrown away?  Other suggestions?

John
--
------------------------------------------------------------------------------
  John Kesling  -  [e-mail]   or   [e-mail]
------------------------------------------------------------------------------
    WA8ZGO      -  via AX.25 packet radio [e-mail]
------------------------------------------------------------------------------



From [e-mail] Thu Aug 10 15:33:27 1995
Path: grape.epix.net!sc2c526a.ra.osd.mil!nova.sti.nasa.gov!lerc.nasa.gov!magnus.acs.ohio-state.edu!math.ohio-state.edu!howland.reston.ans.net!news.sprintlink.net!nuclear.microserve.net!pinetree
From: [e-mail] (WB3U)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: MDS downconverters good for parts?
Date: Wed, 09 Aug 95 22:31:24 GMT
Organization: Microserve Information Systems (800)-380-INET
Lines: 38
Distribution: world
Message-ID: <40bdo2$[e-mail]>
References: <40b9vi$[e-mail]>
NNTP-Posting-Host: pinetree.microserve.com
X-Newsreader: News Xpress Version 1.0 Beta #4

   [e-mail] (John Darrell Kesling) wrote:

>I recently obtained several MDS downconverters.
    <snip>
>Does anyone know the frequency of MDS CHANNEL 1?
>
>Should they be scrapped for parts, converted to another frequency,
>used as-is or thrown away?  Other suggestions?

MDS1: 2150 to 2156 MHz
Visual Carrier:   2154.75
Color Subcarrier: 2151.17
Aural Carrier:    2150.25

MDS2: 2156 to 2162 MHz
Visual Carrier:   2160.75
Color Subcarrier: 2157.17
Aural Carrier:    2156.25

Note that the relationship of the carriers in both MDS channels is
inverted relative to normal TV broadcasts.

BTW, I haven't seen MDS-only downconverters in quite some time.  Most
of these were used in the mid 70's to early 80's, following which ITFS
and MMDS (2.5 - 2.7 GHz) began gaining popularity for commercial
multichannel "Wireless Cable" use.

Note that the video standard at the higher MMDS band is identical to
"normal" television broadcasts.  Later model downconverters, some of
which have dual front ends for receiving both MDS and MMDS, use a L.O.
located between the two services.  Thus, MDS is reinverted on
conversion, while MMDS is not.

Sorry, no suggestions for a good use.

73,

Jack  WB3U


From [e-mail] Thu Aug 10 15:33:28 1995
Path: grape.epix.net!news.sprintlink.net!hookup!news.mathworks.com!newsfeed.internetmci.com!tank.news.pipex.net!pipex!howland.reston.ans.net!agate!!tvr
From: [e-mail]
Newsgroups: sci.electronics,rec.radio.amateur.homebrew
Subject: Re: Modulating VCO's
Date: 08 Aug 1995 03:59:00 GMT
Organization: CNMAT
Lines: 38
Message-ID: <[e-mail]>
References: <401inl$[e-mail]>
NNTP-Posting-Host: boulez.cnmat.berkeley.edu
In-reply-to: [e-mail]'s message of Sun, 06 Aug 1995 05:06:08 GMT
Xref: grape.epix.net sci.electronics:138707 rec.radio.amateur.homebrew:8793

    I'm looking for some pointers to detailed work on modulating vco's and
    synthesizers for transmitters. I'm specificaly looking for more
    information on Dual port modulation for FSK data. Technical reports
    are fine, application notes, etc.

A recent project or two on DDS (direct digital synthesis) in either "QST"
or "73" magazine uses the HSP45102, simplist of the Harris DDS chips, along
with a video DAC as a VCO intended for HF use.  That article doesn't use
the feature, but the chip can store two frequencies.  You put your digital
input into the frequency select input of the DDS chip and load the right
data into the chip and you get instant FSK.  That datasheet is available
via their AnswerFAX service:

        http://www.semi.harris.com/datasheets/dsp/hsp45102/

You'll have to use a mixer or multipliers to get it up into a band where
it'll make much difference.  (Be careful about spectral purity if you
start from a "73" article, as i don't recall seeing very much documentation
in their articles about that and it makes me wonder about that.  If you're
operating under an amateur radio license, you can't hide behind Sec. 15.23;
e.g. it doesn't matter if you "may not possess the means to perform the
measurements for determining compliance with the regulations", you still
must comply.)

I suppose that you might be able to do something like that with one of the
Motorola synthesizer chips that uses parallel inputs,  choose parameters
very carefully and can come up suitable configuration in the feedback loop.
However, i don't think that's necessary.  Their ordinary transmitter ICs
should work just fine for what you want, you just have to figure out where
to inject the signal.  See the MC13175/176 UHF transmitter IC data sheet
for details (includes both AM and FM modulation).  These datasheets can be
obtained from the Motorola fax-back service, which is available via:

        http://motserv.indirect.com/home2/fax_rqst.html

as i don't think they have either of those devices on-line yet.

                        -- KD6PAG  (networking old-timer, RF newbie)


From [e-mail] Thu Aug 10 15:33:29 1995
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From: [e-mail] (John Lundgren)
Newsgroups: sci.electronics,rec.radio.amateur.homebrew
Subject: Re: Modulating VCO's
Followup-To: sci.electronics,rec.radio.amateur.homebrew
Date: 9 Aug 1995 07:39:32 GMT
Organization: Delta Internet Services, Anaheim, CA
Lines: 25
Message-ID: <409onk$[e-mail]>
References: <401inl$[e-mail]>
NNTP-Posting-Host: delta1.deltanet.com
X-Newsreader: TIN [version 1.2 PL2]
Xref: grape.epix.net sci.electronics:138903 rec.radio.amateur.homebrew:8819

David Bengtson ([e-mail]) penned:
: I'm looking for some pointers to detailed work on modulating vco's and
: synthesizers for transmitters. I'm specificaly looking for more
: information on Dual port modulation for FSK data. Technical reports
: are fine, application notes, etc.

: Thanks for any pointers

: David Bengtson
: Yes, these are my opinions
: Looking for Old HP-41 Calculators and Accessories

For NBFM, you can get away with switching a capacitor in and out of being
in parallel with a crystal.  That way, you can have your crystal and eat
it, too. ;-)


--
#==================================================================#
|    John Lundgren - Elec Tech - Info Tech Svcs  | jlundgre@delta1 |
|    Rancho Santiago Community College District  | .deltanet.com   |
|    17th St. at Bristol \ Santa Ana, CA 92706   | or @pop.rancho  |
|    Standard Disclaimers Apply (Blah-Blah...)   |    .cc.ca.us    |
|     "He who toys with the most dies, wins."    | Dr. Kevorkian?  |
#===========PGP=key=available=upon=request=========================#


From [e-mail] Thu Aug 10 15:33:32 1995
Path: grape.epix.net!sc2c526a.ra.osd.mil!nova.sti.nasa.gov!lerc.nasa.gov!news.larc.nasa.gov!lll-winken.llnl.gov!uwm.edu!cs.utexas.edu!news.sprintlink.net!newsfeed.internetmci.com!solaris.cc.vt.edu!mkeitz
From: [e-mail] (Mike Keitz)
Newsgroups: sci.electronics,rec.radio.amateur.homebrew
Subject: Re: Modulating VCO's
Date: Wed, 09 Aug 95 08:38:21 GMT
Organization: TSE Systems
Lines: 66
Message-ID: <409s83$[e-mail]>
References: <401inl$[e-mail]> <409onk$[e-mail]>
NNTP-Posting-Host: mkeitz.beve.blacksburg.va.us
X-Newsreader: News Xpress Version 1.0 Beta #4
Xref: grape.epix.net sci.electronics:138915 rec.radio.amateur.homebrew:8822

In article <409onk$[e-mail]>,
   [e-mail] (John Lundgren) wrote:
>David Bengtson ([e-mail]) penned:
>: I'm looking for some pointers to detailed work on modulating vco's and
>: synthesizers for transmitters. I'm specificaly looking for more
>: information on Dual port modulation for FSK data. Technical reports
>: are fine, application notes, etc.
>
>: Thanks for any pointers
>
>: David Bengtson
>: Yes, these are my opinions
>: Looking for Old HP-41 Calculators and Accessories
>
>For NBFM, you can get away with switching a capacitor in and out of being
>in parallel with a crystal.  That way, you can have your crystal and eat
>it, too. ;-)
>
>
This is however, not what David is after, as he specifically mentioned
vco's and synthesizers.  If you are using the variable crystal approach, it
 is much better to use a varactor diode in conjunction with the crystal so
continuous frequency changes can be effected.  Simply switching leads to a
lot of undesired sidebands.

The conventional "single oscillator" (my term for it) VHF FM transciever is
turning out to be quite inadequate for high-speed FSK packet, at least in
the versions supplied by the Japanese manufacturers.  The primary
limitation of this design is that the PLL must re-lock on every change from
transmit to receive and vice versa.  Thus the radio is unable to transmit
or receive for a period of 100 or more milliseconds at the beginning and
end of each transmission.  Since 9600 baud packets can be less than 25 ms
long, this is a tremendous waste of channel capacity.

Another major problem with the single oscillator set is that in order to
tune fast from TX/RX, the loop filter must have a wide bandwidth, on the
order of 100 Hz or more.  But with a wide feedback bandwidth, the PLL will
"fight" the modulation, causing a great deal of distortion of the
transmitted signal unless rather elaborate compensation is used.  The
compensation is likely to require individual adjustment for each unit.  It
may be possible to lower the bandwidth to a few Hz once lock has been
achieved, but this is likely to push out the RX->TX transition time even
more.

A much better design is a heterodyne system.  Here the PLL runs
continuously at the LO frequency.  Thus the radio is always ready to
receive.  When transmitting is required, a crystal oscillator at the IF
frequency is switched on and mixed with the LO.  The output of the mixer
has 3 main components, LO-IF, LO, and LO+IF.  This latter signal is on the
correct frequency for transmission (assuming simplex operation.  For offset
channels, either the VCO/LO can be retuned (slow) or another crystal for
each frequency split provided (expensive)).  A fairly good filter is
required to reject the spurious outputs from the mixer, before the power
amplifier.

Modulation is applied to the heterodyne oscillator using VXO techniques.
The PLL will not distort the modulation, and it also remains locked during
the transition from receive to transmit and back.  Thus very fast
changeover time can be achieved.  This type of design used to be somewhat
popular in commercial equipment.  The Santec ST-144uP 2-meter HT is one
example.  However, the cost of the extra crystal, mixer, and filter, as
well as the inherent lack of wide transmit frequency coverage (without
readjusting the filter anyway) has caused it to become extinct in today's
market.

-Mike KD4QDM


From [e-mail] Thu Aug 10 15:33:32 1995
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From: [e-mail]
Newsgroups: sci.electronics,rec.radio.amateur.homebrew
Subject: Re: Modulating VCO's
Date: 9 Aug 1995 02:23:03 GMT
Organization: McMaster University, Hamilton, Ontario, Canada (NewServer)
Lines: 6
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Xref: grape.epix.net sci.electronics:138925 rec.radio.amateur.homebrew:8824

I am not good enough to answer your question but I am wondering if you
could help me? I am trying to design a transmiter that could modulate the
entire AM band. Any hints? Specifically do you know of a chip that I
could perhaps VCO control and hence sweep the AM band.
                                                Steve S.



From [e-mail] Thu Aug 10 15:33:33 1995
Path: grape.epix.net!sc2c526a.ra.osd.mil!nova.sti.nasa.gov!lerc.nasa.gov!magnus.acs.ohio-state.edu!math.ohio-state.edu!howland.reston.ans.net!newsjunkie.ans.net!swiss.ans.net!upsnews.ups.com!brownie.iim.ups.com!iim2tlm
From: [e-mail] (Tom Mosher)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Modulating VCO's
Date: 9 Aug 1995 19:34:34 GMT
Organization: II Morrow, Inc.
Lines: 24
Message-ID: <40b2ka$[e-mail]>
References: <401inl$[e-mail]> <409onk$[e-mail]> <409s83$[e-mail]>
NNTP-Posting-Host: seal.iim.ups.com
X-Newsreader: News Xpress Version 1.0 Beta #3

In article <409s83$[e-mail]>, [e-mail] (Mike Keitz) wrote:

<snip>
> .... The primary
>limitation of this design is that the PLL must re-lock on every change from
>transmit to receive and vice versa.  Thus the radio is unable to transmit
>or receive for a period of 100 or more milliseconds at the beginning and
>end of each transmission.  Since 9600 baud packets can be less than 25 ms
>long, this is a tremendous waste of channel capacity.

Howdy,
You later point out that you're assuming simplex operating.  In a simple
design, the PLL does not need to be re-programmed from rx to tx, since it can
operate at the same frequency (if the IFs for rx and tx are the same).  A
single PLL simplex transceiver can be made to switch from rx to tx very
rapidly, but this isn't a common technique because the market for simplex-only
radios is very small.

73 de Tom - KC7AGK

++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Tom Mosher               II Morrow, Inc.           [e-mail]
My views do not represent those of II Morrow or United Parcel Service.



From [e-mail] Thu Aug 10 15:33:35 1995
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From: [e-mail] (Dana Myers)
Newsgroups: sci.electronics,rec.radio.amateur.homebrew
Subject: Re: Modulating VCO's
Date: 9 Aug 1995 22:55:05 GMT
Organization: SunSoft South, Los Angeles, CA
Lines: 101
Message-ID: <40bec9$[e-mail]>
References: <401inl$[e-mail]> <409onk$[e-mail]> <409s83$[e-mail]>
NNTP-Posting-Host: sunspot.west.sun.com
Xref: grape.epix.net sci.electronics:139023 rec.radio.amateur.homebrew:8846

In article <409s83$[e-mail]>, Mike Keitz <[e-mail]> wrote:
>In article <409onk$[e-mail]>,
>   [e-mail] (John Lundgren) wrote:
>>David Bengtson ([e-mail]) penned:
>>: I'm looking for some pointers to detailed work on modulating vco's and
>>: synthesizers for transmitters. I'm specificaly looking for more
>>: information on Dual port modulation for FSK data. Technical reports
>>: are fine, application notes, etc.
>>
>>: Thanks for any pointers
>>
>>: David Bengtson
>>: Yes, these are my opinions
>>: Looking for Old HP-41 Calculators and Accessories
>>
>>For NBFM, you can get away with switching a capacitor in and out of being
>>in parallel with a crystal.  That way, you can have your crystal and eat
>>it, too. ;-)
>>
>>
>This is however, not what David is after, as he specifically mentioned
>vco's and synthesizers.  If you are using the variable crystal approach, it
> is much better to use a varactor diode in conjunction with the crystal so
>continuous frequency changes can be effected.  Simply switching leads to a
>lot of undesired sidebands.
>
>The conventional "single oscillator" (my term for it) VHF FM transciever is
>turning out to be quite inadequate for high-speed FSK packet, at least in
>the versions supplied by the Japanese manufacturers.  The primary
>limitation of this design is that the PLL must re-lock on every change from
>transmit to receive and vice versa.  Thus the radio is unable to transmit
>or receive for a period of 100 or more milliseconds at the beginning and
>end of each transmission.  Since 9600 baud packets can be less than 25 ms
>long, this is a tremendous waste of channel capacity.

A single oscillator PLL synthesizer can lock up in considerably less
than 100mS.  I have several Motorola MCX100 transceivers that are
specified to lock up in less than 3mS.  The key is to use an adaptive
loop filter; some designs shunt diode(s) across resistors in the loop
filter to do this, but it is better to use switches like 4066 quad
to modify the loop filter in a predictable manner.

>Another major problem with the single oscillator set is that in order to
>tune fast from TX/RX, the loop filter must have a wide bandwidth, on the
>order of 100 Hz or more.  But with a wide feedback bandwidth, the PLL will
>"fight" the modulation, causing a great deal of distortion of the
>transmitted signal unless rather elaborate compensation is used.  The
>compensation is likely to require individual adjustment for each unit.  It
>may be possible to lower the bandwidth to a few Hz once lock has been
>achieved, but this is likely to push out the RX->TX transition time even
>more.

You are correct to point out the lock-up time vs. VCO modulation
trade-off.  However, keep in mind that loop bandwidth choice is
also influenced by reference noise considerations, though this is
often not a big issue.

Don't overlook the use of "two point" modulation; modulation is applied
to the VCO and also to the reference.  For example, the Motorola MCX100
I mentioned above also offers this capability.  You may be able to
retrofit the ability to modulate the reference to an existing synth,
but be very careful not to make your reference source become noisy
and drifty.

Whenever you make any changes to a PLL synth, you should always do the
math first to make sure you don't break the PLL synth in some unexpected
way (like it won't lock up at all ;-).

>A much better design is a heterodyne system.  Here the PLL runs
>continuously at the LO frequency.  Thus the radio is always ready to
>receive.  When transmitting is required, a crystal oscillator at the IF
>frequency is switched on and mixed with the LO.  The output of the mixer
>has 3 main components, LO-IF, LO, and LO+IF.  This latter signal is on the
>correct frequency for transmission (assuming simplex operation.  For offset
>channels, either the VCO/LO can be retuned (slow) or another crystal for
>each frequency split provided (expensive)).  A fairly good filter is
>required to reject the spurious outputs from the mixer, before the power
>amplifier.

>Modulation is applied to the heterodyne oscillator using VXO techniques.
>The PLL will not distort the modulation, and it also remains locked during
>the transition from receive to transmit and back.  Thus very fast
>changeover time can be achieved.  This type of design used to be somewhat
>popular in commercial equipment.  The Santec ST-144uP 2-meter HT is one
>example.  However, the cost of the extra crystal, mixer, and filter, as
>well as the inherent lack of wide transmit frequency coverage (without
>readjusting the filter anyway) has caused it to become extinct in today's
>market.

The extra complication of the VXO, mixer, and adequate mixer image
rejection are the major issues with this.  The transmit filter often
ends up being a set of helical resonators with the inherent narrow
bandwidth you mention.  A decent two point modulation design can give
you the necessary DC modulation response and TX/RX switchover time
with consideranbly less complication and also remove the possibility
of inadequate transmit image suppression.

--
 * Dana H. Myers KK6JQ, DoD#: j | Views expressed here are      *
 * [phone]               | mine and do not necessarily   *
 * [e-mail]      | reflect those of my employer  *


From [e-mail] Thu Aug 10 15:33:37 1995
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From: [e-mail] (David Bengtson)
Newsgroups: sci.electronics,rec.radio.amateur.homebrew
Subject: Re: Modulating VCO's
Date: Thu, 10 Aug 1995 03:19:04 GMT
Organization: Connection Technologies
Lines: 37
Message-ID: <40btv5$[e-mail]>
References: <401inl$[e-mail]> <409onk$[e-mail]> <409s83$[e-mail]> <40bec9$[e-mail]>
NNTP-Posting-Host: a1p07.connect.net
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Xref: grape.epix.net sci.electronics:139056 rec.radio.amateur.homebrew:8854

[e-mail] (Dana Myers) wrote:

>In article <409s83$[e-mail]>, Mike Keitz <[e-mail]> wrote:
>>In article <409onk$[e-mail]>,
>>   [e-mail] (John Lundgren) wrote:

Much Deleted, due to a nasty newsposter.


More grungy details are in order. This is going into a actual shipping
product, so things like transmit splatter, modulation accuracy, lock
time are big players. This is also to be powered off of a single AAA
cell, so total current consumption is a big issue, also. The actual
modulation scheme is a 4 level FSK, with deviation frequencies of +/-
800 Hz and +/- 2400 Hz. The frequencies must be within +/- 40 Hz for
the system to work, adding another little bit of Joy.

The current plan is to use a Dual port scheme, where the modulation is
appiled to both the reference oscillator and the VCO. My concerns with
this is that the parts count starts to go way up, along with the
circuit complexity. However, there appears to be no way around it, and
no one has suggested any other solutions.

I have perused my synthesizer books, and there appears to be no real
mention of modulation in any or them, indicating the appropriate
math/simulations to perform. I have MDS (HP's Microwave Design System)
to use for simulation,  so simulations are another possibility.
However, I haven't seen any real detailed treatments of modulation at
all, which is why I posted the base message, looking for suggestions
on references to track down.


Dave Bengtson
David Bengtson
Yes, these are my opinions
Looking for Old HP-41 Calculators and Accessories



From [e-mail] Thu Aug 10 15:33:38 1995
Newsgroups: sci.electronics,rec.radio.amateur.homebrew
Path: grape.epix.net!sc2c526a.ra.osd.mil!nova.sti.nasa.gov!lerc.nasa.gov!magnus.acs.ohio-state.edu!math.ohio-state.edu!cs.utexas.edu!swrinde!emory!cssun.mathcs.emory.edu!wa4mei!ke4zv!gary
From: [e-mail] (Gary Coffman)
Subject: Re: Modulating VCO's
Message-ID: <[e-mail]>
Reply-To: [e-mail] (Gary Coffman)
Organization: Destructive Testing Systems
References: <401inl$[e-mail]> <409onk$[e-mail]> <409s83$[e-mail]> <40bec9$[e-mail]> <40btv5$[e-mail]>
Date: Thu, 10 Aug 1995 15:27:31 GMT
Lines: 39
Xref: grape.epix.net sci.electronics:139144 rec.radio.amateur.homebrew:8864

In article <40btv5$[e-mail]> [e-mail] (David Bengtson) writes:
>
>Much Deleted, due to a nasty newsposter.
>
>More grungy details are in order. This is going into a actual shipping
>product, so things like transmit splatter, modulation accuracy, lock
>time are big players. This is also to be powered off of a single AAA
>cell, so total current consumption is a big issue, also. The actual
>modulation scheme is a 4 level FSK, with deviation frequencies of +/-
>800 Hz and +/- 2400 Hz. The frequencies must be within +/- 40 Hz for
>the system to work, adding another little bit of Joy.
>
>The current plan is to use a Dual port scheme, where the modulation is
>appiled to both the reference oscillator and the VCO. My concerns with
>this is that the parts count starts to go way up, along with the
>circuit complexity. However, there appears to be no way around it, and
>no one has suggested any other solutions.
>
>I have perused my synthesizer books, and there appears to be no real
>mention of modulation in any or them, indicating the appropriate
>math/simulations to perform. I have MDS (HP's Microwave Design System)
>to use for simulation,  so simulations are another possibility.
>However, I haven't seen any real detailed treatments of modulation at
>all, which is why I posted the base message, looking for suggestions
>on references to track down.

Perhaps you're going at this the wrong way. If you want a 4-level
modulation, then perhaps you should be considering a pair of multipliers
in phase quadrature on the output of the synthesizer instead of modulating
it directly. With the appropriate modulating waveform, you can generate
any arbitrary output you might need. The synthesizer is then just a
reference carrier and can be of conventional single loop design.

Gary
--
Gary Coffman KE4ZV          |    You make it,     | gatech!wa4mei!ke4zv!gary
Destructive Testing Systems |    we break it.     | emory!kd4nc!ke4zv!gary
534 Shannon Way             |    Guaranteed!      | [e-mail]
Lawrenceville, GA 30244     |                     |


From [e-mail] Thu Aug 10 15:33:39 1995
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From: [e-mail] (MFSCHICK)
Newsgroups: rec.radio.amateur.homebrew
Subject: Need 3-500Z specs for modifying HF amp
Date: 8 Aug 1995 17:03:25 -0400
Organization: America Online, Inc. (1-800-827-6364)
Lines: 14
Sender: [e-mail]
Message-ID: <408jet$[e-mail]>
Reply-To: [e-mail] (MFSCHICK)
NNTP-Posting-Host: newsbf02.mail.aol.com

I have an old Swan Mark I amp that I would like to modify and improve for
3-28MHz. This amp has two 3-500Z tubes in push-pull, cathode driven AB2
configuration. One of the modifications I would like to do is to install a
tuned Pi-L input filter to help cut out harmonics, etc.  I am trying to
find the characteristics for the 3-500Z tubes so I can calculate the
component values in the tuned filter, but haven't had any luck.  Does
anyone know what the input impedance, plate impedance and other parameters
of this tube are in a ground grid arrangement (plate voltage of 2.5KV) and
how to calculate the actual impedance see by the filter when two of these
tubes are in connected in parallel in the amp?  Any help on the subject
would be appreciated and thanks in advance.

Martin, KA4IWG  [e-mail]



From [e-mail] Thu Aug 10 15:33:42 1995
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From: [e-mail] (W8JI  Tom)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Need 3-500Z specs for modifying HF amp
Date: 9 Aug 1995 01:13:58 -0400
Organization: America Online, Inc. (1-800-827-6364)
Lines: 98
Sender: [e-mail]
Message-ID: <409g6m$[e-mail]>
References: <408jet$[e-mail]>
Reply-To: [e-mail] (W8JI  Tom)
NNTP-Posting-Host: newsbf02.mail.aol.com

Hi Martin,

>I have an old Swan Mark I amp that I would like to modify and improve
>for 3-28MHz.

>One of the modifications I would like to do is to install a tuned Pi-L
input
>filter to help cut out harmonics, etc.

A Pi-L input filter (or even output) will not offer much, if any,
improvement
in harmonic suppression. The layout (component placement, connection
points, and lead dress) and shielding are much more important, especially
with high order harmonics. Tuned input circuits can be strange animals as
to
their effects on harmonic levels, efficiency, and IMD performance. I have
measured IMD and efficiency deterioration when a tuned input was added,
as well as cases that showed improvement!

To be safe I recommend a low pass pi-network with a Q of 2 to 5 placed
very close to the cathodes of the tubes (minimal lead length) or using
high
capacitance (very low impedance line) if the input circuit has to be
located
some distance from the tubes. Placing a tuned input a fair distance (even
15
inches or so) from the tube can kill high end (20 meter and higher)
efficiency
unless a very low Z line is used.

>I am trying to find the characteristics for the 3-500Z tubes so I can
>calculate the component values in the tuned filter, but haven't had any
luck.
>Does anyone know what the input impedance, plate impedance and other
>parameters of this tube are in a ground grid arrangement (plate voltage
of
>2.5KV) and how to calculate the actual impedance see by the filter when
>two of these tubes are in connected in parallel in the amp?

The input Z will be around 50 ohms or slightly higher for two tubes in a
good layout. There will be some parallel capacitive reactance that becomes

important above 10 MHz, and usually some shunt L (from the filament
choke) on the low end. The best way to set up the input in this amplifier
type
is to place four 220 ohm non-inductive resistors from each filament pin to

chassis. The tubes are left in the sockets and the input is aligned with
the
power off and tubes cold with some type of low power RF impedance
measuring device like an SWR Analyzer or meter.

The plate impedance is a direct function of the plate current and voltage,
and
conduction angle of the tube. The output source impedance is the RF anode
voltage at the fundamental frequency over the available anode circuit RF
current, so it changes with voltage to current ratio and is independent of

feedback or the actual type of tube. This is the impedance that must be
conjugately matched to the load for maximum efficiency. ;-)

At full CCS power of 1200 watts output (2500 v anode, 800 mA, 200
degree conduction angle) I calculate 1600 ohms approximately. At lower
output power levels with 2500 volts fixed supply the impedance will rise,
at
higher power levels it will decrease. The output network is typically
designed for the desired Q at maximum power, and the Q is allowed to
increase if the power level is decreased. This insures sufficient harmonic

suppression and proper network operation at maximum power...where it is
most important. A range of 10 to 20 would probably be acceptable, the
lower Q resulting in less tank heating but slightly less harmonic
suppression,
and the higher Q resulting in slightly more tank heating but a little bit
better
harmonic suppression on low order harmonics. Most air variable amplifiers
with large tubes operating at high voltages must have the Q compromised to

hit both ends of the HF spectrum.

But usually there is very little change in efficiency or high order
harmonic
suppression if the Q is changed over a two to one (or larger) ratio as
long as
the components and tank layout are reasonably good, so don't be overly
concerned with extreme accuracy. Just try to meet or exceed the minimum Q
desired at full power (the Q will nearly double if you operate at half
power
with the same anode voltage anyway).

Varian will send you details on calculating the effective plate impedance
in a
book called "The Care and Feeding of Power Grid Tubes" and a 3-500 data
sheet. Call them, they have application engineers that love to be
bothered!

73 Tom



From [e-mail] Thu Aug 10 15:33:42 1995
Path: grape.epix.net!sc2c526a.ra.osd.mil!nova.sti.nasa.gov!lerc.nasa.gov!magnus.acs.ohio-state.edu!math.ohio-state.edu!howland.reston.ans.net!news.sprintlink.net!nuclear.microserve.net!pinetree
From: [e-mail] (WB3U)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Need 3-500Z specs for modifying HF amp
Date: Wed, 09 Aug 95 22:14:47 GMT
Organization: Microserve Information Systems (800)-380-INET
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X-Newsreader: News Xpress Version 1.0 Beta #4

   [e-mail] (MFSCHICK) wrote:
>I have an old Swan Mark I amp that I would like to modify and improve
>for 3-28MHz.

Rather than reinvent the wheel, why not just look in back copies of
the ARRL Handbook?  That would be a lot simpler than designing the
entire tank circuit from scratch.  At the very least, you would
also see how others have built these, and maybe get some ideas
regarding other component values, like coupling caps and plate chokes.

73 & GL,

Jack  WB3U


From [e-mail] Thu Aug 10 15:33:46 1995
Path: grape.epix.net!news.sprintlink.net!newsfeed.internetmci.com!news.dacom.co.kr!news.netins.net!news.netins.net!negaard
From: [e-mail] (David Negaard (Oberon-))
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Optoisolator cross-reference help and PAL programming information
Date: 08 Aug 1995 17:15:34 GMT
Organization: INS Info Services, Des Moines, Iowa, USA
Lines: 48
Distribution: world
Message-ID: <[e-mail]>
References: <[e-mail]>
        <[e-mail]>
NNTP-Posting-Host: draagen.graceland.edu
In-reply-to: [e-mail]'s message of Sat, 5 Aug 1995 02:26:43 GMT

>>>>> "Aaron" == Aaron Cummings <[e-mail]> writes:

>>>>> David Negaard (Oberon-) ([e-mail]) wrote:
>> [...]

Aaron> By looking at the schematic, you should be able to determine
Aaron> what you need for an optoisolator - I'm guessing that it is
Aaron> nothing too exotic, probably just a bipolar output...T.I. makes
Aaron> several, check your Digi_key catalog.

Got the optoisolator handled, I think: I've gotten several e-mail
messages indicating the manufacturer, and if I can't cross-reference
it with that info, I remember seeing one in the Mouser catalog that
looked like a functional equivalent.

>> The other part of the project that's missing is the PAL used to
>> decode the PC bus logic.  It's a 20L10 and I can get the part, but
>> I don't know how to program it.  Maybe I'm confused, but one must
>> program Programmable Array Logic, mustn't one?

Aaron> Yes, you will need to program the PAL, and it is not a trivial
Aaron> process.  Tools exist for developing PAL programs, but they
Aaron> cost $$ - Can you get away with just using logic gates???

I _think_ I _probably_ could do that, but I'm really at the outer
limits of my current understanding, now.  The text that came with the
schematics is minimal, and so I'm not absolutely sure how things are
being decoded.  Is there anyone who might be able to help me figure
out what I could do to substitute gates for the PAL?  Like I said,
I've got the schematic; all that's missing is artwork (which I can
probably do without) and the logic of the address decoder.  I even
have the source code (of course) for the driver programs for this
card, for Linux, if that would be any help at all.

>> [...]

>> Is there any help available for me out there?

So far there's been quite a bit of help for me, and with a little
more, I'll be on the home stretch for this project.

I also want to publicly thank everyone who's written or posted
already.  Everyone's been really helpful.
--
o David Negaard                   o [e-mail]
o Help Desk Technician            o http://www.graceland.edu/~negaard
o 700 College Avenue              o linux-phile
o Lamoni, IA  50140               o 73 de KB0PXK


From [e-mail] Thu Aug 10 15:33:46 1995
Newsgroups: rec.radio.amateur.homebrew
Path: grape.epix.net!sc2c526a.ra.osd.mil!nova.sti.nasa.gov!lerc.nasa.gov!magnus.acs.ohio-state.edu!freenet.columbus.oh.us!pacific.mps.ohio-state.edu!math.ohio-state.edu!news.cyberstore.ca!vanbc.wimsey.com!io.org!torfree!freenet.toronto.on.ca!ai657
From: [e-mail] (Paul Egan)
Subject: PCB & Iron-on transfer?
Message-ID: <[e-mail]>
Sender: [e-mail] (Paul Egan)
Reply-To: [e-mail] (Paul Egan)
Organization: Toronto Free-Net Inc., Toronto, Ontario, Canada
Date: Thu, 10 Aug 1995 15:10:53 GMT
Lines: 10


I have heard about this method but can't find the product.
I believe that the material is run through a photocopier
and then ironed to a copper clad board. Sounds like a quick
way of getting to the etching stage, without having to use
photo-sensitized boards and developer.
Any help would be appreciated.
Thanks.
Paul VE3GFY



From [e-mail] Thu Aug 10 15:33:47 1995
Path: grape.epix.net!sc2c526a.ra.osd.mil!nova.sti.nasa.gov!lerc.nasa.gov!magnus.acs.ohio-state.edu!math.ohio-state.edu!news.cyberstore.ca!vanbc.wimsey.com!news.rmii.com!newsjunkie.ans.net!gatech!newsfeed.internetmci.com!news.sprintlink.net!cs.utexas.edu!swrinde!ihnp4.ucsd.edu!news1.ucsd.edu!news-mail-gateway
From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: Power Supply comments
Date: 10 Aug 95 14:39:33 GMT
Organization: ucsd usenet gateway
Lines: 28
Message-ID: <[e-mail]>
NNTP-Posting-Host: ucsd.edu
Originator: [e-mail]

In article <[e-mail]>, [e-mail] says...
>
>I want to build a 13.5 Vdc 20 Amp.
[e-mail] (Martin T. Vinson) wrote
Not to dampen your creative spirit, but take it from one who has built many,
many (many) power supplies, etc.....by the time you can buy all of the parts
(including a cabinet to put it in) you can pay for a very nice Astron power
supply....have fun.  KN6UG
--------------------------------
I agree with Martin with two provisos.

If you have a VERY well stocked junk box the cost can be mitigated.  The MOST
expensive parts are the transformer, heat sink, and the case.  I have built
projects where the store bought case cost twice what the components inside cost.

The second provisio is that if you get joy from building, then a power supply
can be a rewarding project!  They can be as simple as the ones that have a zener
reference and several transistors which provide no protection to the supply or
the circuit being supplied  all the way up to fully thermal, over voltage, over
current protected supplies.  I have seen several references to ideas in all of
this range mentioned over the last couple of days.  I am in the process of
building a design (in the works for a year now) that is at the high end for a
remote packet node for TexNet.  Let me know if you still have questions.

Ray Mack
WD5IFS
[e-mail]



From [e-mail] Thu Aug 10 15:33:48 1995
Newsgroups: rec.radio.amateur.homebrew
Path: grape.epix.net!sc2c526a.ra.osd.mil!nova.sti.nasa.gov!lerc.nasa.gov!purdue!haven.umd.edu!news.umbc.edu!eff!news.duke.edu!zombie.ncsc.mil!news.gmi.edu!usenet.eel.ufl.edu!newsfeed.internetmci.com!news.sprintlink.net!howland.reston.ans.net!nntp.crl.com!pacbell.com!amdahl.com!netcomsv!uucp3.netcom.com!lafn.org!lafn.org!ak119
From: [e-mail] (Rothan Maxwell)
Subject: QRP-L list
X-Nntp-Posting-Host: lafn.org
Message-ID: <[e-mail]>
Sender: [e-mail]
Reply-To: [e-mail] (Rothan Maxwell)
Organization: The Los Angeles Free-Net
Date: Tue, 8 Aug 1995 23:04:44 GMT
Lines: 9


Hello!

I'm looking for info on subscribing to the QRP-L list.
If You have info I would appreciate it if you could
e-mail me.

Thanks 73's and 72's max (Nu6u)



From [e-mail] Thu Aug 10 15:33:48 1995
Newsgroups: rec.radio.amateur.homebrew
Path: grape.epix.net!news.sprintlink.net!howland.reston.ans.net!nntp.crl.com!pacbell.com!amdahl.com!netcomsv!uucp3.netcom.com!lafn.org!lafn.org!ak119
From: [e-mail] (Rothan Maxwell)
Subject: QRP-L Thanks!
X-Nntp-Posting-Host: lafn.org
Message-ID: <[e-mail]>
Sender: [e-mail]
Reply-To: [e-mail] (Rothan Maxwell)
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Date: Wed, 9 Aug 1995 15:23:32 GMT
Lines: 5


Thanks for the info on the QRP-L list Guys
cu on the list...Rothan (nu6u)
72's



From [e-mail] Thu Aug 10 15:33:49 1995
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From: Leon Heller <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew,rec.radio.shortwave,rec.radio.amateur.digital.misc,uk.radio.amateur,sci.electronics
Subject: Re: Rotary encoders
Date: Mon, 07 Aug 95 18:32:37 GMT
Organization: Home
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In article <4051b3$[e-mail]>
           [e-mail] "Andrew Thomason" writes:

> Do rotary encoders "go off" after a year or so? Can they be repaired? Do they
>  lose
> their magnetism or is it just dust which gets inside?
>
> I have a couple of digital radios which can be tuned by a knob, one cheap, one
> expensive. In both cases, after a year's use, the frequency started to dither
> around slightly whilst I smoothly turned the knob. I had thought this was due
> to a brain-damaged chip but now think it must be the rotary encoder.

According to my Cirkit catalogue, the Alps low-cost mechanical encoder
has a service life of 10^6 cycles. They cost #8.95 in the UK if that is
what is used in your radios.

Leon
--
Leon Heller, G1HSM                | "Do not adjust your mind, there is
E-mail [e-mail]  |  a fault in reality": on a wall
Phone: [phone]         |  many years ago in Oxford.


From [e-mail] Thu Aug 10 15:33:50 1995
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From: [e-mail] (Richard Karlquist)
Newsgroups: rec.radio.amateur.homebrew,rec.radio.shortwave,rec.radio.amateur.digital.misc,uk.radio.amateur,sci.electronics
Subject: Re: Rotary encoders
Date: 8 Aug 1995 17:43:24 GMT
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In article <[e-mail]>,
Leon Heller  <[e-mail]> wrote:
>In article <4051b3$[e-mail]>
>           [e-mail] "Andrew Thomason" writes:
>
>> Do rotary encoders "go off" after a year or so? Can they be repaired? Do they
>>  lose
>> their magnetism or is it just dust which gets inside?
>>
>> I have a couple of digital radios which can be tuned by a knob, one cheap, one
>> expensive. In both cases, after a year's use, the frequency started to dither
>> around slightly whilst I smoothly turned the knob. I had thought this was due
>> to a brain-damaged chip but now think it must be the rotary encoder.

Yes, rotary encoders are infamous for their poor reliability.  I don't
know what makes them fail, I just know I have seen them go out time and
time again.

Rick Karlquist
[e-mail]


From [e-mail] Thu Aug 10 15:33:51 1995
Path: grape.epix.net!news.sprintlink.net!howland.reston.ans.net!Germany.EU.net!Dortmund.Germany.EU.net!konech.kontron.de!sun4a!tom
From: [e-mail] (Thomas de Lellis)
Newsgroups: rec.radio.amateur.homebrew,rec.radio.shortwave,rec.radio.amateur.digital.misc,uk.radio.amateur,sci.electronics
Subject: Re: Rotary encoders
Followup-To: rec.radio.amateur.homebrew,rec.radio.shortwave,rec.radio.amateur.digital.misc,uk.radio.amateur,sci.electronics
Date: 9 Aug 1995 08:45:12 GMT
Organization: Kontron Elektronik GmbH
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Andrew Thomason ([e-mail]) wrote:
: Do rotary encoders "go off" after a year or so? Can they be repaired? Do they lose
: their magnetism or is it just dust which gets inside?

: I have a couple of digital radios which can be tuned by a knob, one cheap, one
: expensive. In both cases, after a year's use, the frequency started to dither
: around slightly whilst I smoothly turned the knob. I had thought this was due
: to a brain-damaged chip but now think it must be the rotary encoder.

: Many thanks,
: Andrew Thomason ([e-mail])

Hi there,

yes, same thing happened with my Kenwood R-5000 which used an optical rotary
encoder. After talking with a local Kenwood dealer here in Munich, that
was disinterested in taking the radio for service, I decided to have a go
at it myself and tracked the problem down to a bad photodetector in the
encoder itself. I was able to replace the detector with a detector removed
from an emitter/detector module of the write protect section of a junked
TEAC floppydrive. I was lucky it also fit mechancally in the R-5000 encoder.
My R-5000's tuning knob has worked perfectly ever since.

tom

--
________________
Thomas de Lellis
KN6EI/DL5MGZ


From [e-mail] Thu Aug 10 15:33:52 1995
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From: [e-mail] (Peter Onion)
Newsgroups: rec.radio.amateur.homebrew,rec.radio.shortwave,rec.radio.amateur.digital.misc,uk.radio.amateur,sci.electronics
Subject: Re: Rotary encoders
Date: 9 Aug 1995 14:04:21 GMT
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Thomas de Lellis ([e-mail]) wrote:
: Andrew Thomason ([e-mail]) wrote:
: : Do rotary encoders "go off" after a year or so? Can they be repaired? Do they lose
: : their magnetism or is it just dust which gets inside?

: : I have a couple of digital radios which can be tuned by a knob, one cheap, one
: : expensive. In both cases, after a year's use, the frequency started to dither
: : around slightly whilst I smoothly turned the knob. I had thought this was due
: : to a brain-damaged chip but now think it must be the rotary encoder.

: : Many thanks,
: : Andrew Thomason ([e-mail])

Hi,

I have a FT290 MkI that will only qsy HF, no matter which way you turn the knob!

So I think I too have a faulty encoder!  Anybody else had this problem?

Peter Onion. G0DZB
[e-mail]



From [e-mail] Thu Aug 10 15:33:53 1995
Path: grape.epix.net!news.sprintlink.net!newsfeed.internetmci.com!news.mid.net!crcnis3.unl.edu!unlinfo.unl.edu!mcduffie
From: [e-mail] (Gary McDuffie Sr)
Newsgroups: rec.radio.amateur.homebrew,rec.radio.shortwave,rec.radio.amateur.digital.misc,uk.radio.amateur,sci.electronics
Subject: Re: Rotary encoders
Date: 9 Aug 1995 15:23:49 GMT
Organization: University of Nebraska--Lincoln
Lines: 20
Distribution: world
Message-ID: <40aju5$[e-mail]>
References: <4051b3$[e-mail]> <[e-mail]> <4087ns$[e-mail]>
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[e-mail] (Richard Karlquist) writes in a followup:


>Yes, rotary encoders are infamous for their poor reliability.  I don't
>know what makes them fail, I just know I have seen them go out time and
>time again.

I'm assuming :) you are talking about light coupled encoders.  I would
have to say that I disagree with the statement that they are not
reliable.  Some of the most expensive equipment in the world uses
them and they work without fail as long as they are kept clean and
properly aligned.  If designed properly, they won't need alignment,
but dust gets on the encoder wheel and the source/target leds and
causes problems.  Carefully cleaning an encoder wheel will keep it
working for many many years.  Case in point, check out the FT-2400.
It is notorious for encoder wheel problems.  The one they replace it
with, I've been told, is better sealed so that dust can't get to it as
easily.

Gary - AG0N


From [e-mail] Thu Aug 10 15:33:54 1995
Path: grape.epix.net!sc2c526a.ra.osd.mil!nova.sti.nasa.gov!lerc.nasa.gov!magnus.acs.ohio-state.edu!math.ohio-state.edu!howland.reston.ans.net!newsfeed.internetmci.com!usenet.eel.ufl.edu!col.hp.com!news.dtc.hp.com!hpscit.sc.hp.com!rkarlqu
From: [e-mail] (Richard Karlquist)
Newsgroups: rec.radio.amateur.homebrew,rec.radio.shortwave,rec.radio.amateur.digital.misc,uk.radio.amateur,sci.electronics
Subject: Re: Rotary encoders
Date: 9 Aug 1995 16:41:11 GMT
Organization: Hewlett-Packard
Lines: 21
Message-ID: <40aof7$[e-mail]>
References: <4051b3$[e-mail]> <[e-mail]> <4087ns$[e-mail]> <40aju5$[e-mail]>
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In article <40aju5$[e-mail]>,
Gary McDuffie Sr <[e-mail]> wrote:
>[e-mail] (Richard Karlquist) writes in a followup:
>
>
>>Yes, rotary encoders are infamous for their poor reliability.  I don't
>>know what makes them fail, I just know I have seen them go out time and
>>time again.
>
>I'm assuming :) you are talking about light coupled encoders.  I would
>have to say that I disagree with the statement that they are not
>reliable.  Some of the most expensive equipment in the world uses
>them and they work without fail as long as they are kept clean and
>properly aligned.  If designed properly, they won't need alignment,

Speaking of expensive equipment, the $58,000 HP 8663A is a case in
point.  The rotary encoder in that instrument has a relatively high
failure rate.  I don't know if the failed ones can be rehabilitated
by cleaning out the dust.

Rick Karlquist


From [e-mail] Thu Aug 10 15:33:55 1995
Newsgroups: rec.radio.amateur.homebrew,rec.radio.shortwave,rec.radio.amateur.digital.misc,uk.radio.amateur,sci.electronics
Path: grape.epix.net!sc2c526a.ra.osd.mil!nova.sti.nasa.gov!lerc.nasa.gov!magnus.acs.ohio-state.edu!math.ohio-state.edu!howland.reston.ans.net!gatech!wa4mei!ke4zv!gary
From: [e-mail] (Gary Coffman)
Subject: Re: Rotary encoders
Message-ID: <[e-mail]>
Reply-To: [e-mail] (Gary Coffman)
Organization: Destructive Testing Systems
References: <4051b3$[e-mail]> <[e-mail]> <4087ns$[e-mail]>
Date: Wed, 9 Aug 1995 15:51:41 GMT
Lines: 34
Xref: grape.epix.net rec.radio.amateur.homebrew:8840 rec.radio.shortwave:56817 rec.radio.amateur.digital.misc:9956 sci.electronics:138983

In article <4087ns$[e-mail]> [e-mail] (Richard Karlquist) writes:
>In article <[e-mail]>,
>Leon Heller  <[e-mail]> wrote:
>>In article <4051b3$[e-mail]>
>>           [e-mail] "Andrew Thomason" writes:
>>
>>> Do rotary encoders "go off" after a year or so? Can they be repaired? Do they
>>>  lose
>>> their magnetism or is it just dust which gets inside?
>>>
>>> I have a couple of digital radios which can be tuned by a knob, one cheap, one
>>> expensive. In both cases, after a year's use, the frequency started to dither
>>> around slightly whilst I smoothly turned the knob. I had thought this was due
>>> to a brain-damaged chip but now think it must be the rotary encoder.
>
>Yes, rotary encoders are infamous for their poor reliability.  I don't
>know what makes them fail, I just know I have seen them go out time and
>time again.

Actually, optical shaft encoders are noted for their extreme reliability
and long life. About the only things that can harm them is contamination
of the optical surfaces, an electrical surge that blows the LEDs or
phototransistors, or shaft bearing failure. Now unfortunately, some of
the shaft encoders used in amateur equipment are mechanical rather than
optical, and tarnished contacts, and ordinary contact wear, take a rapid
toll.

Gary

--
Gary Coffman KE4ZV          |    You make it,     | gatech!wa4mei!ke4zv!gary
Destructive Testing Systems |    we break it.     | emory!kd4nc!ke4zv!gary
534 Shannon Way             |    Guaranteed!      | [e-mail]
Lawrenceville, GA 30244     |                     |


From [e-mail] Thu Aug 10 15:33:56 1995
Newsgroups: rec.radio.amateur.homebrew,rec.radio.shortwave,rec.radio.amateur.digital.misc,uk.radio.amateur,sci.electronics
Path: grape.epix.net!sc2c526a.ra.osd.mil!nova.sti.nasa.gov!lerc.nasa.gov!magnus.acs.ohio-state.edu!math.ohio-state.edu!howland.reston.ans.net!vixen.cso.uiuc.edu!sdd.hp.com!hppwd!hplb!hpwin055.uksr!hpqmoea!dstock
From: [e-mail] (David Stockton)
Subject: Re: Rotary encoders
Sender: [e-mail] (SQF News Admin)
Message-ID: <[e-mail]>
Date: Thu, 10 Aug 1995 07:51:37 GMT
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Richard Karlquist ([e-mail]) wrote:

: Speaking of expensive equipment, the $58,000 HP 8663A is a case in
: point.  The rotary encoder in that instrument has a relatively high
: failure rate.  I don't know if the failed ones can be rehabilitated
: by cleaning out the dust.
: Rick Karlquist

    The original RPG in that generation and earlier actually used a
filament bulb as the light source, I think it was only in the mid 80's
that things switched over to LED based rotary pulse generators. I'd
moved into prod eng for a few years around that time and had to change
everything in production at Queensferry over to the new type.

    I had a different problem with one... I wore out the shaft and bush
in a prototype instrument doing testing (Spurious hunting)  I swear one
of my fingers is worn down, too. For the gross-overkill-global-
domination class transceiver I keep building bits of, I think I may have
to make my own RPG with proper ball races...

    The mechanical switch things are definitely bad news. Incidentally,
how many people know that genuine Microsoft mice use nasty contact type
pulse generators?  I keep wearing them out playing Doom.

    Cheers
              David  GM4ZNX


From [e-mail] Thu Aug 10 15:33:57 1995
Path: grape.epix.net!sc2c526a.ra.osd.mil!nova.sti.nasa.gov!lerc.nasa.gov!purdue!haven.umd.edu!cs.umd.edu!zombie.ncsc.mil!news.gmi.edu!usenet.eel.ufl.edu!newsfeed.internetmci.com!news.sprintlink.net!howland.reston.ans.net!news-e1a.megaweb.com!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail
From: [e-mail] (MikeDom)
Newsgroups: rec.radio.amateur.antenna,rec.radio.amateur.homebrew,rec.radio.amateur.misc,rec.radio.amateur.equipment
Subject: Re: ROTOR - Channel master - old tv salvage
Date: 9 Aug 1995 00:45:08 -0400
Organization: America Online, Inc. (1-800-827-6364)
Lines: 7
Sender: [e-mail]
Message-ID: <409egk$[e-mail]>
References: <3vonnm$[e-mail]>
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Xref: grape.epix.net rec.radio.amateur.antenna:12681 rec.radio.amateur.homebrew:8816 rec.radio.amateur.misc:84560 rec.radio.amateur.equipment:15580

Hi Dan, You have an old channel master rotor, and all of the 3 wire rotors
were basically the same. A new control box will run you old motor. I
believe its something like 20 volts AC to run the thing if you want to
make your own control.
We just used one of those beasts this last field day....but we had a 12V
DC motor installed in it ( we were QRP Battery) it worked quite well.
                     73  mike


From [e-mail] Thu Aug 10 15:33:57 1995
Newsgroups: rec.radio.amateur.homebrew
Path: grape.epix.net!news.sprintlink.net!alfa02.medio.net!guysmiley.blarg.com!eskimo!novatech
From: [e-mail] (Steven Swift)
Subject: Re: Schematic Draw Program Recommendations?
X-Nntp-Posting-Host: eskimo.com
Message-ID: <[e-mail]>
Sender: [e-mail] (News User Id)
Organization: Eskimo North (206) For-Ever
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References: <3vsrso$[e-mail]> <4042u1$[e-mail]> <[e-mail]>
Date: Tue, 8 Aug 1995 14:29:10 GMT
Lines: 21

[e-mail] (Gary Coffman) writes:

>An ideal setup is Orcad as a frontend for Pcad. *Now* you're talking
>bucks, but it automates almost all of the tedium of translating an
>idea to a schematic and circuit board layout.

I use Orcad with Eagle 3.0.  This combo is excellent and very easy to
use.  It handles just about any type of board from simple to complex
surface mount. Eagle (CadSoft) also has a schematic module, but
I haven't used it.

>Gary
>--
>Gary Coffman KE4ZV          |    You make it,     | gatech!wa4mei!ke4zv!gary
>Destructive Testing Systems |    we break it.     | emory!kd4nc!ke4zv!gary
>534 Shannon Way             |    Guaranteed!      | [e-mail]
>Lawrenceville, GA 30244     |                     |
--
Steven D. Swift, P.E.           ( [e-mail] )
NOVATECH INSTRUMENTS, INC.      1530 Eastlake Avenue East, Suite 303
206.322.1562, FAX [phone]  Seattle, Washington 98102 USA


From [e-mail] Thu Aug 10 15:33:58 1995
Path: grape.epix.net!news.sprintlink.net!news.gate.net!sysop
From: [e-mail] (Larry Lewis)
Newsgroups: rec.radio.amateur.homebrew
Subject: SCR Help
Date: Tue, 08 Aug 1995 11:23:40 GMT
Lines: 6
Message-ID: <407h9e$[e-mail]>
NNTP-Posting-Host: @ftmfl-14.gate.net
X-Newsreader: Forte Free Agent 1.0.82

I  can't find the basing diagram for a C122B, TO-220 case, 8A 200V
SCR.   Any help, hint or just point me in the right direction would be
appreciated.  Larry KN6WC

E-Mail: [e-mail]



From [e-mail] Thu Aug 10 15:33:59 1995
Newsgroups: rec.radio.amateur.homebrew
Path: grape.epix.net!news.sprintlink.net!EU.net!howland.reston.ans.net!swrinde!elroy.jpl.nasa.gov!lll-winken.llnl.gov!enews.sgi.com!wdl1.wdl.loral.com!enterprise!pax!jeffa
From: [e-mail] (Jeff Albom)
Subject: Re: stainless/titanium wire source
Message-ID: <[e-mail]>
Sender: jeffa@pax (Jeff Albom)
Organization: Space Systems Loral
References: <4059su$[e-mail]> <405euj$[e-mail]>
Date: Mon, 7 Aug 1995 21:08:38 GMT
Lines: 7

Go to Orchard Supply Hardware and you can buy spools of stainless steel wire.

***************************************************************************
**What appears to be a sloppy or meaningless use of words may well be a  **
**completely correct use of words to express sloppy or meaningless ideas.**
***************************************************************************
[e-mail]


From [e-mail] Thu Aug 10 15:34:00 1995
Path: grape.epix.net!sc2c526a.ra.osd.mil!nova.sti.nasa.gov!lerc.nasa.gov!purdue!haven.umd.edu!news.umbc.edu!hookup!bloom-beacon.mit.edu!news.moneng.mei.com!news.ecn.bgu.edu!vixen.cso.uiuc.edu!howland.reston.ans.net!swrinde!ihnp4.ucsd.edu!news1.ucsd.edu!news-mail-gateway
From: [e-mail] (Duncan Cadd)
Newsgroups: rec.radio.amateur.homebrew
Subject: Titanium wire etc
Date: 9 Aug 95 09:09:36 GMT
Organization: ucsd usenet gateway
Lines: 52
Message-ID: <[e-mail]>
NNTP-Posting-Host: ucsd.edu
Originator: [e-mail]

Greetings from a warm and sunny Diepenbeek in N.E. Belgium!



Stephen Parry asked about supplies of titanium wire.  One possibility is
Aldrich Chemical Company, 1001 W. St. Paul Avenue, Milwaukee, Wisconsin 53233
tel [phone] fax [phone].


They also have stuff like tungsten, zirconium, molybdenum, nickel etc etc wire,
foil and what-have-you.  Prices will be high-ish as they are suppliers of
research grade chemicals, rather than work-a-day ironmongery, examples:

THESE PRICES ARE IN BELGIAN FRANKS!!  sorry, but that's life! (and what did you
expect from Belgium!?)

titanium wire:

cat no. 34,886-4 99.99% pure 0.5mm diam  450milligrams (50cm long) BF 1824
                                         2.7 grams     (300cm)     BF 6400

        26,790-2 99.7% pure  0.81mm diam  23grams (10 metres long) BF 1623
                                         115grams (50 metres)      BF 5544

Stuff like titanium, zirconium, tantalum and a whole pile of other metals can
be used as 'getters' (which someone asked about a few days back) in tubes.


Sorry folks, but I don't know if they will sell in small quantities to 'the
public' but you can always ask, and I'm sure they will offer advice as to
where you can try once you explain your intentions - I hope this helps.

If you are looking for general advice on vacuum systems etc, I'd suggest
"Building Scientific Apparatus - A Practical Guide to Design and Construction"
by John H. Moore, Christopher C. Davis and Michael A. Coplan, published by
Addison Wesley, the old edition which I have is 1983, ISBN 0-201-05532-5, but
there's a newer one, also in soft cover (the hardback was EXPENSIVE!  62 UK
pounds in '88 or so) - maybe the local library could get it for you.  It lists
many US suppliers, but again, it's research oriented so many will be pricey
and may not be interested in 'small' sales.  But you can always try . . .

73,

Duncan  ON9CHU  /  G0UTY   G-QRP 8117


IMO/SBG,
Afdeling Organische Scheikunde,
Gebouw D,
Limburgs Universitair Centrum,
B-3590 Diepenbeek,
Belgium


From [e-mail] Thu Aug 10 15:34:00 1995
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From: [e-mail] (Anthony D'Ercole)
Newsgroups: rec.radio.amateur.homebrew
Subject: TS-440 RS232 command set
Date: 9 Aug 1995 13:01:08 GMT
Organization: Lockheed Aeronautical Systems Company
Lines: 10
Message-ID: <40abik$[e-mail]>
Reply-To: [e-mail]
NNTP-Posting-Host: rtm13.lasc.lockheed.com

I would like to interface my personal commputer to my TS-440 RS232
serial port.  Does anyone know where I can get my hands on the Command
Set for the Radio.  The format of the commands on the responses back.
(i.e. the Software ICD)








From [e-mail] Thu Aug 10 15:34:01 1995
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From: [e-mail] (Jonathan Ho)
Newsgroups: rec.radio.amateur.homebrew
Subject: unsubscribe
Date: 7 Aug 95 20:59:48 GMT
Organization: ucsd usenet gateway
Lines: 1
Message-ID: <[e-mail]>
NNTP-Posting-Host: ucsd.edu
Originator: [e-mail]

unsubscribe


From [e-mail] Thu Aug 10 15:34:02 1995
Path: grape.epix.net!news.sprintlink.net!cs.utexas.edu!not-for-mail
From: [e-mail] (Peter Glibbery)
Newsgroups: rec.radio.amateur.antenna,rec.radio.amateur.homebrew,rec.radio.amateur.misc
Subject: US Military Field Expedient Antennas
Date: 9 Aug 1995 04:25:19 -0500
Organization: UTexas Mail-to-News Gateway
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Message-ID: <[e-mail]>
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Xref: grape.epix.net rec.radio.amateur.antenna:12685 rec.radio.amateur.homebrew:8820 rec.radio.amateur.misc:84567

I have some fairly basic questions that I would appreciate your help and
guidance  with.

I have been reading a US Army Special Forces manual which discusses various
types of improvised, field-expedient antennas such as:

Ground Plane
Horizontal
Long-wire
Half-Rhombic
Doublet

I'm writing from the UK and the references mentioned in the manual are not at
all easy to come by - I've tried.

1) In the case of some of these designs there is a need for a 'ground'. The
diagrams in the manual show one end of a wire attached to a metal stake which
is pushed into the ground, while the other end is attached to the radio set
itself. Where on the radio set is the free end of the ground wire attached ? Is
it attached to some kind of socket, or do you somehow attach it to the body of
the radio set ?

2) When using a 1/2-Rhombic the manual mentions that you feed the two 1/4 wave
antenna elements from the centre using a 'coax'. What exactly is a 'coax' and
how does it differ from the antenna wire itself ?

3) With the 1/2-Rhombic design the manual suggests that if a coax is not
available to use a 'twisted pair'. What is a twisted pair ? My guess is two
sheathed copper wires twisted together - but is this too simple a thought ?

4) With the 1/2-Rhombic one end of the antenna wire is attached to a
terminating resistor. The idea of this resistor is to give some
directionality to the radio wave (I recognise that there is a difference
between a resistor and an insulator (in the later case, the manual suggests a
piece of wood or a C-ration spoon)). Does anyone have a good idea of what would
make a good field expedient resistor ?

Thanks,

Peter




From [e-mail] Thu Aug 10 15:34:02 1995
Path: grape.epix.net!news.sprintlink.net!howland.reston.ans.net!swrinde!emory!nntp.msstate.edu!Nntp.wes.army.mil!usenet
From: [e-mail] (Butch Magee)
Newsgroups: rec.radio.amateur.antenna,rec.radio.amateur.homebrew,rec.radio.amateur.misc
Subject: Re: US Military Field Expedient Antennas
Date: 9 Aug 1995 14:02:44 GMT
Organization: USACE WES ITL
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In article <[e-mail]>, [e-mail] (Peter Glibbery) says:
>
>You'r kidding us, right Peter?  Playing a little "see who will respond"
game?  Ok!  you got one, me.

Butch


From [e-mail] Thu Aug 10 15:34:03 1995
Path: grape.epix.net!news.sprintlink.net!ionews.ionet.net!usenet
From: [e-mail] (Martin T. Vinson)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Want to build a power supply
Date: 10 Aug 1995 05:46:57 GMT
Organization: Internet Oklahoma
Lines: 24
Message-ID: <40c6gh$[e-mail]>
References: <[e-mail]>
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In article <[e-mail]>, [e-mail]
says...
>
>
>
>Hello,
>
>I want to build a 13.5 Vdc 20 Amp.
>I need someone to draw up the schematics and list of pieces,
>I know some of you will say that it would cost less to buy one
>but I already have many pieces that can probably be used,
>so if there's a genius in that field around, i'd love to hear
>from them...
>
>
>Thanks many times...
>
>Marc

Not to dampen your creative spirit, but take it from one who has built
many, many (many) power supplies, etc.....by the time you can buy all of
the parts (including a cabinet to put it in) you can pay for a very nice
Astron power supply....have fun.  KN6UG



From [e-mail] Mon Aug 14 21:09:33 1995
Newsgroups: rec.radio.amateur.homebrew
Subject: $$$ Use The Internet To M
From: [e-mail] (Clint Bradford)
Path: grape.epix.net!sc2c526a.ra.osd.mil!nova.sti.nasa.gov!lerc.nasa.gov!magnus.acs.ohio-state.edu!math.ohio-state.edu!usc!cs.utexas.edu!news.sprintlink.net!holonet!colossus.holonet.net!wwswinc!clint.bradford
Distribution: world
Message-ID: <[e-mail]>
Date: Fri, 11 Aug 95 11:56:00 -0500
Organization: WoodyWare Software, Inc. - 516-736-6662
Lines: 5

Subject: $$$ Use The Internet To Make Ca$h!! $$$

Are ALL Prodigy Users this ignorant?
---
 ■ wcECHO 4.1 ≈ AR-Net: ATTENTION to Details ■ Mira Loma, CA ■ 909-681-6221


From [e-mail] Mon Aug 14 21:09:34 1995
Path: grape.epix.net!sc2c526a.ra.osd.mil!nova.sti.nasa.gov!lerc.nasa.gov!magnus.acs.ohio-state.edu!math.ohio-state.edu!howland.reston.ans.net!newsjunkie.ans.net!swiss.ans.net!elron2.elron.net!usenet
From: [e-mail] (Tsachy Lindenbaum)
Newsgroups: rec.radio.amateur.homebrew
Subject: 432 Mhz pre-amp
Date: 13 Aug 1995 21:14:50 GMT
Organization: Your Organization
Lines: 13
Message-ID: <40lq0b$[e-mail]>
NNTP-Posting-Host: ts92p11.netvision.net.il
Mime-Version: 1.0
X-Newsreader: WinVN 0.99.4


--
Good bye from:
Hi
I'm looking for a reliable design to be mast-mounted.
It should do 0.5 DB N.F & appx 18 DB gain.
Any ideas ?
Kits are welcome too !!!
Thank you in advance & best regards
Tsachy Lindenbaum, P.O.B 21224 Tel-Aviv 62195, Israel
                   4Z4TL @ 4Z4AAA.ISR.MDLE
                   972-9-582959



From [e-mail] Mon Aug 14 21:09:34 1995
Path: grape.epix.net!news.sprintlink.net!howland.reston.ans.net!ix.netcom.com!netnews
From: [e-mail] (Koert Koelman )
Newsgroups: rec.radio.amateur.homebrew
Subject: Auction in N. Calif.
Date: 13 Aug 1995 05:39:25 GMT
Organization: Netcom
Lines: 9
Message-ID: <40k36d$[e-mail]>
NNTP-Posting-Host: ix-pa9-16.ix.netcom.com

The annual Amateur Radio Auction by the Palo Alto Amateur Radio
Association (PAARA), a non-profit orgabization, will be held in the
Ampex cafeteria at 401 Broadway, Redwood City, CA on Saturday, October
7, 1995.  Doors will open around 7:30 a.m.

Further details will follow within a week.  However, already mark this
date on your calendars so that you will not miss this exciting event.

                                      73/Koert KC6WCI


From [e-mail] Mon Aug 14 21:09:35 1995
Path: grape.epix.net!news.sprintlink.net!gatech!howland.reston.ans.net!ix.netcom.com!netnews
From: [e-mail] (Guy Scott )
Newsgroups: rec.radio.amateur.homebrew
Subject: Calibration of Freq.Counter
Date: 12 Aug 1995 11:56:28 GMT
Organization: Netcom
Lines: 9
Message-ID: <40i4tc$[e-mail]>
NNTP-Posting-Host: ix-wpb-fl1-02.ix.netcom.com


    Hi all, just had a question on calibrating a freq. counter thats
been kicking me for a while.
    Ive heard of using wwv broadcasts for calibration but was
comepletly lost to exactly how this was accomplised. Also if this
calibration can be done with a home made IE: inexpensive freq. standard
in the shack?
     All info. is welcome!
  Thanks, Henry (Ke4wbw)


From [e-mail] Mon Aug 14 21:09:36 1995
Path: grape.epix.net!news.sprintlink.net!newsfeed.internetmci.com!solaris.cc.vt.edu!mkeitz
From: [e-mail] (Mike Keitz)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Calibration of Freq.Counter
Date: Sat, 12 Aug 95 15:31:01 GMT
Organization: TSE Systems
Lines: 43
Message-ID: <40ihhd$[e-mail]>
References: <40i4tc$[e-mail]>
NNTP-Posting-Host: mkeitz.beve.blacksburg.va.us
X-Newsreader: News Xpress Version 1.0 Beta #4

In article <40i4tc$[e-mail]>,
   [e-mail] (Guy Scott ) wrote:
>
>    Hi all, just had a question on calibrating a freq. counter thats
>been kicking me for a while.
>    Ive heard of using wwv broadcasts for calibration but was
>comepletly lost to exactly how this was accomplised. Also if this
>calibration can be done with a home made IE: inexpensive freq. standard
>in the shack?

To calibrate to WWV, you zero-beat the frequency counter's reference signal
(usually 10 MHz) to the WWV carrier.  While listening to WWV on 10.000 MHz,
switch on the frequency counter and listen for the beat frequency (Let the
counter warm up for a half hour or so before adjusting though).  Most cheap
counters will leak plenty of signal out that it will couple into the
receiver antenna.  More deluxe ones usually have a "10 MHz out" or such BNC
on the back to which you could connect a piece of wire to serve as an
antenna.  It takes a bit of time to be sure you really have zero beat, when
you are close it will sound like the signal strength of WWV is rising and
falling periodically.

This works fairly well, certainly for a quick setup of a counter that isn't
going to be very stable anyway.  An advanced method I have heard of, but
not tried, is to modify a Loran-C receiver to bring out a signal
synchronized to the received signal timing.  The Loran transmitters are
controlled by accurate atomic clocks as well, and being ground wave there
is less variation due to the atmosphere.  Use a 2-channel scope to compare
the average phase drift of the oscillator you're calibrating over the Loran
pulse, or simply count the GRI frequency (usually 100-200 Hz).  A counter
which does "period average" measurements would resolve this low frequency
better.

A similar technique may exist using GPS as well.  Signals derived from TV
broadcasts, once regarded as very precise, are now only moderately precise
because the TV stations may resynchronize everything to their local crystal
oscillator.  This is still better than nothing, and can often be done with
no equipment by using a wire or loop "antenna" to pick up and count the
horizontal-rate pulses (15.734265 KHz, *not* 15.750 KHz any more) radiated
by a TV tuned to a stable broadcast signal.

-Mike KD4QDM




From [e-mail] Mon Aug 14 21:09:37 1995
Path: grape.epix.net!news.sprintlink.net!newsfeed.internetmci.com!btnet!dispatch.news.demon.net!demon!pinetree
From: [e-mail] (WB3U)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Calibration of Freq.Counter
Date: Sat, 12 Aug 95 16:38:57 GMT
Lines: 29
Message-ID: <[e-mail]>
References: <40i4tc$[e-mail]> <40ihhd$[e-mail]>
NNTP-Posting-Host: pinetree.microserve.com
X-NNTP-Posting-Host: pinetree.microserve.com
X-Newsreader: News Xpress Version 1.0 Beta #4

In article <40ihhd$[e-mail]>,
>
>A similar technique may exist using GPS as well.

In the MMDS industry, we often have a need to lock adjacent
transmitting sites that are fifty miles or less apart to a common
reference.  By locking the L.O.'s of the TV transmitters and
modulators to a common source, we can greatly reduce the visible
effects of co-channel interference.

GPS is gaining widespread popularity for this use.  When everything is
working correctly, there is no actual frequency difference between two
(or more) transmit sites, only a phase shift.

GPS receivers used for this purpose include a disciplined 10 MHz
VCXO that is updated periodically by the GPS signals.  The quality of
the disciplined oscillator ultimately has a lot to do with the
quality and stability of the 10 MHz output, because the receiver's
control pulses only serve to "fine tune" it.

If a custom GPS-locked reference was used directly to drive the
counter, it would virtually eliminate the need to ever align it.  Cost
for these units is still outside the range of the typical homebrew
workshop, but prices *are* falling.

73,

Jack  WB3U


From [e-mail] Mon Aug 14 21:09:38 1995
Path: grape.epix.net!news.sprintlink.net!howland.reston.ans.net!vixen.cso.uiuc.edu!prairienet.org!w9sz
From: [e-mail] (Zack Widup)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Calibration of Freq.Counter
Date: 12 Aug 1995 18:19:29 GMT
Organization: University of Illinois at Urbana
Lines: 23
Message-ID: <40irbh$[e-mail]>
References: <40i4tc$[e-mail]>
Reply-To: [e-mail] (Zack Widup)
NNTP-Posting-Host: firefly.prairienet.org


In a previous article, [e-mail] (Guy Scott) says:

>
>    Hi all, just had a question on calibrating a freq. counter thats
>been kicking me for a while.
>    Ive heard of using wwv broadcasts for calibration but was
>comepletly lost to exactly how this was accomplised. Also if this
>calibration can be done with a home made IE: inexpensive freq. standard
>in the shack?
>     All info. is welcome!
>  Thanks, Henry (Ke4wbw)
>

I have a freq counter that uses an oddball xtal (3.9 something-or-other MHz.)
What I have is a 10-MHz crystal-oven oscillator and a 100 MHz oscillator
phaselocked to it which will eventually be the base for a 10 GHz SSB
transverter (See Glenn Elmore N6GN articles in Ham Radio.) The 10 MHz
ocsillator is zeroed with WWV.
I use the 100 MHz output to calibrate the freq counter every once in a while.
Makes it a little more accurate than with the 10 MHz signal.

                                        73, Zack W9SZ


From [e-mail] Mon Aug 14 21:09:38 1995
Path: grape.epix.net!news.sprintlink.net!dispatch.news.demon.net!demon!pinetree
From: [e-mail] (WB3U)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Calibration of Freq.Counter
Date: Sat, 12 Aug 95 19:07:31 GMT
Lines: 14
Message-ID: <[e-mail]>
References: <40i4tc$[e-mail]> <40irbh$[e-mail]>
NNTP-Posting-Host: pinetree.microserve.com
X-NNTP-Posting-Host: pinetree.microserve.com
X-Newsreader: News Xpress Version 1.0 Beta #4

In article <40irbh$[e-mail]>,
   [e-mail] (Zack Widup) wrote:

>What I have is a 10-MHz crystal-oven oscillator and a 100 MHz
>oscillator phaselocked to it which will eventually be the base for a
>10 GHz SSB transverter (See Glenn Elmore N6GN articles in Ham Radio.)

Out of curiosity, is the 100 MHz oscillator a VCO or VCXO?  Is phase
noise a consideration in your design?

73,

Jack  WB3U


From [e-mail] Mon Aug 14 21:09:39 1995
Newsgroups: rec.radio.amateur.homebrew
Path: grape.epix.net!news.sprintlink.net!howland.reston.ans.net!swrinde!emory!cssun.mathcs.emory.edu!wa4mei!ke4zv!gary
From: [e-mail] (Gary Coffman)
Subject: Re: Calibration of Freq.Counter
Message-ID: <[e-mail]>
Reply-To: [e-mail] (Gary Coffman)
Organization: Destructive Testing Systems
References: <40i4tc$[e-mail]>
Date: Sun, 13 Aug 1995 15:28:29 GMT
Lines: 35

In article <40i4tc$[e-mail]> [e-mail] (Guy Scott ) writes:
>
>    Hi all, just had a question on calibrating a freq. counter thats
>been kicking me for a while.
>    Ive heard of using wwv broadcasts for calibration but was
>comepletly lost to exactly how this was accomplised. Also if this
>calibration can be done with a home made IE: inexpensive freq. standard
>in the shack?

There are two rather simple ways to calibrate a counter against WWV.
First, if your counter reference oscillator's fundamental or harmonic
falls on a WWV frequency, then you simply use a receiver to zero beat
the reference to WWV. For example, if your counter uses a 10 MHz reference
oscillator, you'd just filch a bit of that signal out of the counter
and inject it into your receiver along with an antenna input for WWV.
Put the receiver in AM mode, and adjust the reference oscillator for
zero beat, a scope can help when you get down to a subaudible beat,
or you can watch the S-meter's rise and fall.

If your counter's timebase isn't a fundamental or harmonic of a WWV
frequency, then you'll need a transfer oscillator. A 10 MHz crystal
oscillator will do. Just zero beat it to WWV with the receiver as
above, and while it's at zero beat, read its frequency with the
counter. Adjust the counter's reference oscillator so that the
counter displays exactly 10 MHz and you are done.

Needless to say, the counter should be warmed up and stable before
attempting this calibration.

Gary
--
Gary Coffman KE4ZV          |    You make it,     | gatech!wa4mei!ke4zv!gary
Destructive Testing Systems |    we break it.     | emory!kd4nc!ke4zv!gary
534 Shannon Way             |    Guaranteed!      | [e-mail]
Lawrenceville, GA 30244     |                     |


From [e-mail] Mon Aug 14 21:09:41 1995
Newsgroups: rec.radio.amateur.homebrew
Path: grape.epix.net!news.sprintlink.net!howland.reston.ans.net!ix.netcom.com!netcom.com!mzenier
From: [e-mail] (Mark Zenier)
Subject: Re: Can Schems/Diags be Posted here? *.uue??
Message-ID: <[e-mail]>
Organization: NETCOM On-line Communication Services (408 261-4700 guest)
References: [e-mail]> <[e-mail]> <40bd1d$[e-mail]> <40d8ap$[e-mail]> <40dkoi$[e-mail]>
Date: Fri, 11 Aug 1995 22:37:20 GMT
Lines: 41
Sender: [e-mail]

in <40dkoi$[e-mail]>, WB3U wrote:
: I understand that concept Jim, but I really think it's nit-pickin' to
: apply it to this situation.  If net-wide resources are really a
: concern, one only has to take a peek at alt.binaries.pictures.erotica
: and a.b.p.multimedia to realize that a few schematics aren't even a
: drop in the bucket.

: Schematics and other technical drawings would often be helpful and
: relevant when discussing homebrew topics.  Unless objections are based
: on something other than general resources, I say go for it!

Do not assume that the tools you use to read this apply to everyone.

Anything posted to some groups gets transfered though channels that charge
by volume.  Either through people who subscribe to the email gateway list
server and get charged for their email, or by sites that access a limited
number of newsgroups and use the UUCP batching from an upstream site.  These
recipients have no option.  They get no preview of the traffic.  They end
up paying, whether the posting is useful to them or not.

They get really upset if someone dumps a whole lot of traffic on them.
(The most recent case was someone posting a half a meg of cad package
to sci.electronics.  Flame city.)

As for a schematic group in the big 7 (now 8) hierarchies, I proposed this
for the reorganization of the sci.electronics hierarchy thats under
discussion now.  The word from the group-advice mailing list (who look
out for the interests of all usenet, and more specifically the news
administators) was that it would be considered a binaries group and
should only be a moderated group in the comp.binaries hierarchy.  Maybe
you could convince them.  I didn't want the hassle, so I took it out
of the RFD proposal.

Mark Zenier  [e-mail]  [e-mail]
"I've never been able to explain to people that the version of Seattle
they have in their heads is not the Seattle I grew up in.  I mean,
if Seattle is Oz, I guess I was one of the flying monkeys." - Lynda Barry.






From [e-mail] Mon Aug 14 21:09:41 1995
Path: grape.epix.net!news.sprintlink.net!newsfeed.internetmci.com!btnet!dispatch.news.demon.net!demon!pinetree
From: [e-mail] (WB3U)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Can Schems/Diags be Posted here? *.uue??
Date: Sat, 12 Aug 95 19:15:56 GMT
Lines: 19
Message-ID: <[e-mail]>
References: [e-mail]> <[e-mail]> <40bd1d$[e-mail]> <40d8ap$[e-mail]> <40dkoi$[e-mail]> <[e-mail]>
NNTP-Posting-Host: pinetree.microserve.com
X-NNTP-Posting-Host: pinetree.microserve.com
X-Newsreader: News Xpress Version 1.0 Beta #4

   [e-mail] (Mark Zenier) wrote:

>Anything posted to some groups gets transfered though channels that
>charge by volume.
    <snip>
>These recipients have no option.  They get no preview of the traffic.
>They end up paying, whether the posting is useful to them or not.

Now that's a valid reason.  Of course, it leads to the question of how
to distribute a useful binary.  I'm lucky enough to have a personal
anon FTP area available through my service provider, but that's not
always the case.  Also, e-mail can be a real pain if too many folks
want a copy.  Any suggestions for a work-around, other than starting a
new group?

73,

Jack  WB3U


From [e-mail] Mon Aug 14 21:09:42 1995
Path: grape.epix.net!news.sprintlink.net!cs.utexas.edu!uwm.edu!newsspool.doit.wisc.edu!koala.uwec.edu!usenet
From: dan drumm <drumm>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: cross reference semiconductors.
Date: 12 Aug 1995 17:56:03 GMT
Organization: University of Wisconsin Eau Claire
Lines: 44
Message-ID: <40ipvj$[e-mail]>
References: <40g9p6$[e-mail]> <40gn2o$[e-mail]>
NNTP-Posting-Host: lilith.uwec.edu
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 1.1N (X11; I; OSF1 V3.2 alpha)
To: [e-mail]
X-URL: news:40gn2o$[e-mail]

[e-mail] (Gary V. Deutschmann, Sr.) wrote:
>In article <40g9p6$[e-mail]>, drumm says...
>>
>>here is a general and specific question.  how do I cross reference
>>transistors, chips, etc.  I do not want to call up parts stores, because
>>I have so much salvage laying around the house, that I could build a
>>hundred projects, and still not make a dent.
>>
>>I have a NTE cross ref. program, but that only gives me NTE #'s.
>>
>>Is there anything more general I could use?
>>
>>Specifically, this time I was looking for a substitute for a TIP-120
>>I am sure it is a general purpose switching transistor, but it would
>>have been nice to find some listed as a good cross.
>>
>>thanks for the ideas.
>>
>>
>>-- Dan
>>N9vox
>>
>>BTW: Am I the only one who can not stand to see good electronics
>>thrown away?  Why buy new what will last forever and is free?
>>
>Tip-120s are very common, the NTE number is the generic number for this
>transistor, usually an ECG number would be the same number.  ECGs number is
>261.
>
>If you keep parts the way I do, I finally put every transistor in sorted
>envelopes under the ECG number for that part.  That way finding them is
>easy.
>
>Gary

OK, a very simple idea.  That's the best kind!  I guess I'll have to
sit down for an afternoon and enter part numbers.  I'll cross them
all to NTE since I have that program handy.

Thanks.

-- Danny
N9VOX



From [e-mail] Mon Aug 14 21:09:43 1995
Path: grape.epix.net!news.sprintlink.net!newsfeed.internetmci.com!news.mid.net!news.dra.com!news.starnet.net!wupost!news1.inlink.com!usenet
From: [e-mail] (Gary V. Deutschmann, Sr.)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: cross reference semiconductors.
Date: 11 Aug 1995 22:54:16 GMT
Organization: Inlink
Lines: 34
Message-ID: <40gn2o$[e-mail]>
References: <40g9p6$[e-mail]>
NNTP-Posting-Host: slip11.inlink.com
Mime-Version: 1.0
Content-Type: Text/Plain; charset=ISO-8859-1
X-Newsreader: WinVN 0.99.5

In article <40g9p6$[e-mail]>, drumm says...
>
>here is a general and specific question.  how do I cross reference
>transistors, chips, etc.  I do not want to call up parts stores, because
>I have so much salvage laying around the house, that I could build a
>hundred projects, and still not make a dent.
>
>I have a NTE cross ref. program, but that only gives me NTE #'s.
>
>Is there anything more general I could use?
>
>Specifically, this time I was looking for a substitute for a TIP-120
>I am sure it is a general purpose switching transistor, but it would
>have been nice to find some listed as a good cross.
>
>thanks for the ideas.
>
>
>-- Dan
>N9vox
>
>BTW: Am I the only one who can not stand to see good electronics
>thrown away?  Why buy new what will last forever and is free?
>
Tip-120s are very common, the NTE number is the generic number for this
transistor, usually an ECG number would be the same number.  ECGs number is
261.

If you keep parts the way I do, I finally put every transistor in sorted
envelopes under the ECG number for that part.  That way finding them is
easy.

Gary



From [e-mail] Mon Aug 14 21:09:45 1995
Path: grape.epix.net!sc2c526a.ra.osd.mil!nova.sti.nasa.gov!lerc.nasa.gov!news.larc.nasa.gov!lll-winken.llnl.gov!hookup!news.uoregon.edu!news.bc.net!felix.junction.net!usenet
From: Stewart Thompson <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew,rec.radio.amateur.misc
Subject: Re: cross reference semiconductors.
Date: 13 Aug 1995 04:50:49 GMT
Organization: Okanagan Internet Junction, Vernon, B.C., Canada
Lines: 35
Message-ID: <40k0b9$[e-mail]>
References: <40g9p6$[e-mail]>
NNTP-Posting-Host: vernon-02.junction.net
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 1.1N (Windows; I; 16bit)
Xref: grape.epix.net rec.radio.amateur.homebrew:8955 rec.radio.amateur.misc:84901

dan drumm <drumm> wrote:
>here is a general and specific question.  how do I cross reference
>transistors, chips, etc.  I do not want to call up parts stores, because
>I have so much salvage laying around the house, that I could build a
>hundred projects, and still not make a dent.
>
>I have a NTE cross ref. program, but that only gives me NTE #'s.
>
>Is there anything more general I could use?
>
>Specifically, this time I was looking for a substitute for a TIP-120
>I am sure it is a general purpose switching transistor, but it would
>have been nice to find some listed as a good cross.
>
>thanks for the ideas.

There are numerous cross reference guides. Try and get your hands on as many as you can. Other
common ones are ECG, GE, RCA, and even Radio Shack. I never throw these away, new numbers are
always being added or deleted. The way I figure out whether a part will work or not is by
crossing the number I want to say the NTE number. I look this up and find out what the
parameters are. (ie npn Ic Vbc etc.) Then I check my parts bin for likely suspects and cross
them also. Usually I can find an exact match. Sometimes you can find a functionally equivelant
part with a differnt pinout. If your stuck you can usully twist the leads around to work.
Obviously that won't work with an IC but its amazing what a little ingenuity can do. Generic
chips can often be swapped, but you have to watch the circuit in question. When it comes to
specailty chips your probably out of luck. With transistors, there are dozens of numbers which
have essentially the same characteristics. For instance a 2n2222, 2n4401, 2n3904 are common
npn transistors which are essentially the same. bear in mind that modern silicon transistors
are pretty stable. In a well designed circuit, just about any transistor that as adequate gain,
voltage and current ratings for the circuit should work just fine in 90 plus per cent of the
circuits you are likely to encounter. Well I hope this helps. Stu.....VE7BQy

                                                 [e-mail]




From [e-mail] Mon Aug 14 21:09:45 1995
Path: grape.epix.net!news.sprintlink.net!newsfeed.internetmci.com!news.mid.net!krypton.hpc.sdsmt.edu!ep68_cns.sdsmt.edu!jbeens
From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: Frequency hopping
Date: Mon, 14 Aug 1995 18:35:21 GMT
Organization: South Dakota School Of Mines and Technology
Lines: 11
Message-ID: <[e-mail]>
NNTP-Posting-Host: ep68_cns.sdsmt.edu
X-Newsreader: Trumpet for Windows [Version 1.0 Rev B final beta #4]

Hello all!
I am a senior in electrical engineering at the South Dakota School of Mines in
Rapid City, SD.  I am considering building a frequency hopping radio as my
senior desing project.  Is there a frequency band that I can legaly do this in?

Thank you,

73's
Jason Beens
KB0CDN



From [e-mail] Mon Aug 14 21:09:47 1995
Path: grape.epix.net!news.sprintlink.net!in1.uu.net!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail
From: [e-mail] (HAM R LUND)
Newsgroups: rec.radio.amateur.homebrew
Subject: FS:  Parts, manuals, accessories, misc.
Date: 13 Aug 1995 12:17:43 -0400
Organization: America Online, Inc. (1-800-827-6364)
Lines: 140
Sender: [e-mail]
Message-ID: <40l8j7$[e-mail]>
NNTP-Posting-Host: newsbf02.mail.aol.com
X-Newsreader: AOL Offline Reader

***********************************************************
***********************************************************
CONTACT: Robert Fowle [e-mail]
Ph. 517-789-6721................................................
1215 Winifred....Jackson, Mich.  49202-1946
----------->the Hammarlund guy

**********************************************************
**********************************************************

The following is a list of items that may be of interest,,,,,,to you ?
All pricing includes shipping..................

PARTS*****************************************************
Of course Hammarlund, if you need something let me know...to much to list,
NOT even Andrew wanted to take the list...  : > )))

****** air variables

have the following for sale, capacity listed where known. most have no
boxes,
all are poly-bagged.  will sell by the piece or trade all for Hammarlund
equipment, manuals, accessories, literature, ect.

If no price is listed...it is $10.00 each

qty.- part# - capacity (if known)
Hammarlund:

1/ 34604-5
1/ 34604-6
1/ 351-1059
1/ 4111-49
1/ 48A084
1/ 5003-C  C1C
1/ 9404-18-00040
2/ 9411-72-50379
2/ 9411-72-60348
1/ 11727-77
1/ A8H501
1/ APC 25      3.0-25.
4/ ASP 100 G                 $13.00 ea
1/ APC 100     5.5-100     $13.00 ea
5/ APC 140     6.7-140     $13.00 ea
1/ B-253-124-2
1/ B-7485-440-2
1/ C 67380
3/ CT 1E040     5.0-40
1/ CT 1E075     6.0-75.
1/ CT 1F040     5.0-40.
1/ CT 3C040
1/ CT 14E042-M  5.0-42
1/ CT 14E042-J   3.0-10.
1/ CT 14F010-J   3.0-10.
1/ CT 14F042-J   5.0-42
1/ CT 1316047-J  5.5-47.
2/ ES 676693-5
2/ KS-13772
3/ KS-13998L1
1/ KS 18998L14
1/ MACBF-3      1.3-3.1   N.I.B.
1/ MAC-5        N.I.B.
1/ HF-15-X       N.I.B.
1/ HF-50          N.I.B.
1/ MAC-20   2.0-21.5
2/ MABF-8   2.0-7.9
1/ MAPC-100   4.5-100.    $13.00
1/ MCD-35 MX   6.0-31.    $15.00
1/ MJ-50-5
1/ P-31800014
1/ P-7761345-15
1/ 34452-40
4/ 841690
1/ 7765659-1           $25.00


CARDWELL

2/ A-105623     25MuFD   $18.00 ea
3/ ZU-100-AS   3.0-100.   $15.00 ea


B&W

1/ CX-62-C : This is the cap used with the KW plug-in coils  $75.00  new
no
box

BUD

1/  1615  AIR GAP-300     75MMFD     $65.00   new no box

EFJ

1/ ? DUAL SECTION 14 3/4" L x 5.50" W  1/8" spacing  (approx. measurments)
$95.00
1/ 48c075  air gap .175  dual sec.,  9.75" L x 4" W             $65.00
1/  ?  5.75" L x  4" W  single sec. 1/8 " spacing                 $55.00
1/  4134MS4  edge wound  41 uh                                      $75.00

*******  BOOKS  &  MANUALS

********************** HAMMARLUND MANUAL SALE
******************************

I have a limited number of new manuals i got when i purchased the
inventory
of
Wayne Cordell.....
These are unused originals. some may have a fade area on the cover from
storage before I got them, yet others look almost as they did 35+ years
ago.
these are new unused and in unread condition.

Here's whats available:

HQ-100.........................$23.00 ea
HQ-145-A......................$23.00 ea
HXL ONE AMP..............$23.00 ea
HX 50............................$23.00 ea
HX-500..........................$23.00 ea

Get them while they last.  I have never made them available in such away
before. This is a unique oppertunity......
SUPPLIES ARE LIMITED.....FIRST COME FIRST SERVE...........

THE FOLLOWING WILL BE  'COPIES'.    Prices are shipped.

HAMMARLUND
Comet Pro    2nd Edition                          20.00
Comet Pro    manual 3  AVCModel            20.00
Four 20 xmitter & four 11 modulator           20.00
RGB  CHC 46140 / CHC 49154                 20.00
HQ - 100                                                 18.00
HQ-100A                                                 18.00
HQ-105TR / TRS                                      18.00
HQ-110                                                   18.00
HQ-110A                                                 18.00
HQ-120X                                                 18.00
HQ-129X


From [e-mail] Mon Aug 14 21:09:48 1995
Path: grape.epix.net!sc2c526a.ra.osd.mil!nova.sti.nasa.gov!lerc.nasa.gov!magnus.acs.ohio-state.edu!math.ohio-state.edu!howland.reston.ans.net!news.sprintlink.net!in2.uu.net!news.compulink.com!abyss!lethe!gts!reptiles.org!westonia!humnet.humberc.on.ca!hduff
Subject: FS: IC-551 FM board !!!
Newsgroups: rec.radio.amateur.homebrew
From: [e-mail]
Date: Fri, 11 Aug 95 17:08:12 EST
Message-ID: <[e-mail]>
Organization: HumberNet LSS
Lines: 18



FS: I have an EX-106 optional FM board for the Icom IC-551 6 meter rig.
I am aware that they as rare as hens teeth...accepting 'attractive'
offers.

Leave e-mail with offer to:  [e-mail]


---
 ■ NFX v1.3 [000]

--
---------------------------------------------------------------------
  HumberNet LSS (Learning Support System) - Humber College, Toronto
     "Tomorrow's communication and learning environment, today"
          Visit our Website at http://humnet.humberc.on.ca/



From [e-mail] Mon Aug 14 21:09:49 1995
Path: grape.epix.net!news.sprintlink.net!ralph.vnet.net!news
From: "Chris M. Bridges" <n4fan.vnet.net>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Help! Source LM359 IC.
Date: 12 Aug 1995 19:30:30 GMT
Organization: Vnet Internet Access, Charlotte, NC -  [e-mail]
Lines: 9
Message-ID: <40ivgm$[e-mail]>
References: <40eh1p$[e-mail]> <40fslf$[e-mail]>
NNTP-Posting-Host: n4fan.vnet.net
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 1.2b4 (Windows; I; 16bit)
To: [e-mail]

Are you looking for LM 358 or LM 359? you list both in you post.
I have maybe 50 LM358's on hand if that is what you need.
--

   Chris M. Bridges
   >>>>>N4FAN<<<<<<
    [e-mail]




From [e-mail] Mon Aug 14 21:09:49 1995
Path: grape.epix.net!news.sprintlink.net!dispatch.news.demon.net!demon!pinetree
From: [e-mail] (WB3U)
Newsgroups: rec.radio.amateur.homebrew
Subject: How to Space-Wind Coils?
Date: Mon, 14 Aug 95 01:03:51 GMT
Lines: 15
Message-ID: <[e-mail]>
NNTP-Posting-Host: pinetree.microserve.com
X-NNTP-Posting-Host: pinetree.microserve.com
X-Newsreader: News Xpress Version 1.0 Beta #4

The other day I was in a sporting goods store and noticed
that monofilament line starts at a diameter of about 0.005" (2 lb
test) and goes up in increments of about 0.002 or 0.003 from there.

This is close to the size of many common wire gauges and I'm wondering
if anyone has ever used fishing line to space-wind a coil?  I know the
diameter of different brands will vary, but is it reasonably
consistent throughout the same spool?  For my purpose, the exact
spacing is less critical than the need for it to be consistent from
one end of the finished coil to the other.

Thanks & 73,

Jack  WB3U


From [e-mail] Mon Aug 14 21:09:50 1995
Path: grape.epix.net!news.sprintlink.net!in1.uu.net!news.deltanet.com!usenet
From: [e-mail] (Mike)
Newsgroups: rec.radio.amateur.homebrew
Subject: HUMOR - 10 Commandments for Technicians
Date: 14 Aug 1995 09:41:52 GMT
Organization: Delta Internet Services, Anaheim, CA
Lines: 84
Message-ID: <40n5p0$[e-mail]>
NNTP-Posting-Host: delta1.deltanet.com
Mime-Version: 1.0
X-Newsreader: WinVN 0.93.11

10 COMMANDMENTS FOR TECHNICIANS
_______________________________

I. BEWARE THE LIGHTNING THAT
LURKETH IN THE UNDISCHARGED
CAPACITOR, LEST IT CAUSE THEE TO
BOUNCE UPON THY BUTTOCKS IN A
MOST UNTECHNICIAN-LIKE MANNER.

II. CAUSE THOU THE SWITCH THAT
SUPPLIETH LARGE QUANTITIES OF
JUICE TO BE ONPENED AND THUSLY
TAGGED, THAT THY DAYS IN THIS
EARTHLY VEIL OF TEARS MAY BE
LONG.

III. PROVE TO THYSELF THAT ALL
CIRCUITS THAT RADIATH AND UPON
WHICH THOU WORKETH ARE GROUNDED
AND THUSLY TAGGED LEST THEY LIFT
THEE TO RADIO FREQUENCY
POTENTIAL AND CAUSETH THEE ALSO
TO MAKE LIKE A RADIATOR.

IV. TARRY NOT AMONGST THOSE
FOOLS WHO ENGAGETH IN
INTENTIONAL SHOCKS FOR THEY ARE
SURELY NONBELIEVERS AND ARE NOT
LONG FOR THIS WORLD.

V. TAKE CARE THAT THOU USETH THE
PROPER METHOD WHEN THOU TAKEST
THE MEASURE OF A HIGH-VOLTAGE
CIRCUIT LEST THOU INCINERATE
BOTH THYSELF AND THY METER, FOR
VERILY, THOUGH THOU HAST NO
ACCOUNT NUMBER AND CAN EASILY BE
SURVEYED, THE TEST METER DOTH
HAVE ONE AND, AS A CONSEQUENCE,
BRINGETH MUCH WOE UNTO THE
SUPPLY DEPARTMENT.

VI. TAKE CARE THAT THOU
TAMPERETH NOT WITH SAFETY
DEVICES AND INTERLOCKS, FOR THIS
INCURETH THE WRATH OF THY
SUPERVISOR AND BRINGETH THE FURY
OF THY SAFTEY INSPECTOR UPON THY
HEAD AND SHOULDERS.

VII. WORK THOU NOT ON ENERGIZED
EQUIPMENT, FOR IF THOU DOST, THY
FELLOW WORKERS WILL SURELY BUY
BEERS FOR THY WIDOW AND CONSOLER
HER IN OTHER WAYS.

VIII. SERVICE THOU NOT EQUIPMENT
FOR ELECTRICAL COOKING. IT IS A
SLOTHFUL PROCESS AND THOU MIGHT
SIZZLE IN THINE OWN FAT FOR
HOURS UPON A HOT CIRCUIT BEFORE
THY MAKER SEE FIT TO END THY
MISERY.

IX. TRIFFLE THOU NOT WITH
RADIOACTIVE TUBES AND SUBSTANCES
LEST THOU COMMENCE TO GLOW IN
THE DARK LIKE A LIGHTNING BUG
AND THY WIFE HAVE NO FURTHER USE
FOR THEE EXCEPT THY WAGES.

X. THOU SHALT NOT MAKE
UNAUTHORIZED MODIFICATIONS TO
EQUIPMENT, BUT CAUSETH THOU TO
BE RECOREDED ALL FIELD CHANGES
AND AUTHORIZED MODIFICATION MADE
BY THEE, LEST THY SUCCESSOR TEAR
HIS HAIR AND GO SLOWLY MAD IN
HIS ATTEMPT TO DECIDE WHAT
MANNER OF CREATURE HATH MADE A
NEST IN THE WIRING OF SUCH
EQUIPMENT.




From [e-mail] Mon Aug 14 21:09:51 1995
Path: grape.epix.net!sc2c526a.ra.osd.mil!nova.sti.nasa.gov!lerc.nasa.gov!magnus.acs.ohio-state.edu!math.ohio-state.edu!howland.reston.ans.net!agate!ihnp4.ucsd.edu!news1.ucsd.edu!news-mail-gateway
From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: IF transformers
Date: 14 Aug 95 14:58:08 GMT
Organization: ucsd usenet gateway
Lines: 19
Message-ID: <[e-mail]>
NNTP-Posting-Host: ucsd.edu
Originator: [e-mail]

Bob (K7NWB) was looking for 1500Khz to 1600 Khz IF transformers.

Bob:
        You may have trouble  finding the exact parts. (BTW back then they wer
1500 Kc transformers :>) ).  The Heath HR 10 series of receivers used this
frequency as the IF with a very broad 2 crystal half lattice.  You could try to
contact Heath and see if they still have any repair stock left.  Another
alternative if you don't care about exactly the right parts woulfd be to find an
old NON-FUNCTIONAL BC454 or BC455 .(PLEASE, PLEASE, please don't destroy a
perfectly good working piece of history).  These radios also used an IF in that
range.  They also came with a variable BFO, a fact I learned when going through
some 1960's era CQ magazines.

Good luck with your project. It sounds like fun.

Ray Mack
WD5IFS
[e-mail]



From [e-mail] Mon Aug 14 21:09:51 1995
Path: grape.epix.net!news.sprintlink.net!howland.reston.ans.net!news.nic.surfnet.nl!news.sara.nl!news.pi.net!news
From: William Vynck <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: KENWOOD IF-10D Interface WANTED
Date: Sun, 13 Aug 95 15:25:56 EDT
Organization: Planet Internet
Lines: 9
Message-ID: <[e-mail]>
NNTP-Posting-Host: bos90.pi.net
Mime-Version: 1.0
Content-Type: TEXT/PLAIN; charset=US-ASCII
X-Newsreader: NEWTNews & Chameleon -- TCP/IP for MS Windows from NetManage


I'm looking for the schematics to build a Kenwood IF10D interface, to connect
my Kenwood TS-50S to my computer.
Also needs some good mod's for the TS-50.

E-mail

[e-mail]



From [e-mail] Mon Aug 14 21:09:52 1995
Path: grape.epix.net!news.sprintlink.net!howland.reston.ans.net!news-e1a.megaweb.com!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail
From: [e-mail] (IBM Del F)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: KENWOOD IF-10D Interface WANTED
Date: 14 Aug 1995 00:30:36 -0400
Organization: America Online, Inc. (1-800-827-6364)
Lines: 51
Sender: [e-mail]
Message-ID: <40mjhc$[e-mail]>
References: <[e-mail]>
Reply-To: [e-mail] (IBM Del F)
NNTP-Posting-Host: newsbf02.mail.aol.com

I built my own interface using just a MAX232 chip and four 10uF caps.
However, before diving into this project I had read somewhere, and
verified for myself after connecting the TS-50 to my computer, that
several of the control features found in other Kenwoods are missing from
the TS-50.  The most serious omission is the capability to write a
frequency to any of the memory channels.  Any of the Kenwood control
programs I've ever used would be crippled when used with this radio.  All
of the programs allow you to read and write frequencies to the memory
channels in Kenwoods that support this.  This would allow you to have
several "pre-load" files with frequencies to program into your radio.  For
instance, if you have 100 freqs for SWBC, just load the file and the
memories are reprogramed in seconds and you're set to go.  Have another
file for aero-traffic on the SW bands, etc.  The TS-50 does not allow you
to do this.  I was very dissappointed when I confirmed the crippled nature
of this radio.  About the only way around this may be to write a program
that provides "virtual memory channels" which you select from your
computer screen and it will write each virtual memory channel frequency
into the 'A' or 'B' VFO as you select different 'virtual memories' on the
computer screen.

A point of observation:  I have the service manual for this unit and in
the block diagram of the system, where a computer and RS232 interface
connect to the 'digital board' in the radio there is a notation: "For
factory and debug".  That just about sums up Kenwood's reason for building
it in.  It certainly wasn't included for full remote-control usage by the
owner.  I guess Kenwood just couldn't imagine anyone wanting to connect a
computer to a mobile unit.  Don't you just love how the manufacturer looks
out for you?

On an up note:  this radio is a fine piece of gear, particularly for
mobile work.  I've mounted it in the console right below the  AM/FM/Tape
factory radio and it blends well.  I do miss a notch filter such as the
one on my TS-440 though.

I have made some mods to it including restoration of full spectrum
transmit capability which for me serves two purposes:  a test signal into
a dummy load when aligning other gear including the TS-440 and for use on
the CAP bands.

If you would like a copy of the MAX232 schematic as it applies to the
TS-50, drop me a note.  Although I have drawn the schematic in .BMP
format, I cannot upload it onto the Internet from my access point so I
would have to mail the hardcopy to you.

I also have one for the TS-440 if anyone is interested.  The TLL signals
of the two radios are NOT the same so if anyone was thinking of using the
same one for both, forget it. You have to build an interface with a hex
inverter added to the MAX232.

Del, KD4B
Raleigh, NC


From [e-mail] Mon Aug 14 21:09:53 1995
Path: grape.epix.net!news.sprintlink.net!cs.utexas.edu!uwm.edu!reuter.cse.ogi.edu!news.tek.com!usenet
From: Antoon Milatz <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: keyer
Date: 14 Aug 1995 10:54:21 GMT
Organization: Tektronix, Inc, Beaverton, OR, USA
Lines: 10
Message-ID: <40na0t$[e-mail]>
NNTP-Posting-Host: 192.158.203.165
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 1.2b5 (Windows; I; 16bit)

Where can I buy the *famous* CW keyer chip ?
I believe it is mentioned in QST.

I need the address and phone/fax number of this company.

regards,

Antoon PA3bwe   (email: [e-mail])




From [e-mail] Mon Aug 14 21:09:54 1995
Path: grape.epix.net!sc2c526a.ra.osd.mil!nova.sti.nasa.gov!lerc.nasa.gov!magnus.acs.ohio-state.edu!math.ohio-state.edu!howland.reston.ans.net!news-e1a.megaweb.com!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail
From: [e-mail] (N1DDZ RJC)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Longwave Transmitter ['lowfer' band]
Date: 11 Aug 1995 23:01:55 -0400
Organization: America Online, Inc. (1-800-827-6364)
Lines: 16
Sender: [e-mail]
Message-ID: <40h5j3$[e-mail]>
References: <402nb4$[e-mail]>
Reply-To: [e-mail] (N1DDZ RJC)
NNTP-Posting-Host: newsbf02.mail.aol.com

There is a great book called the Low Frequency Radio Scrapbook by Ken
Cornell that gives the details.  Actually there are at least two editions,
the earlier being tube oriented and the latter tube plus solid state.  I
think that the Ham Radio bookstore used to sell it and probably Uncle
Wayne would have it.


[e-mail] wrote:
>>My recent poking around the Internet has let me to conclude that 1750
>meters
>>is governed by Part 15:
>>
>>Sec. 15.217 Operation in the band 160-190 kHz.
>
Bob Crowley, Staff Inventor
Input Devices, Wayland MA


From [e-mail] Mon Aug 14 21:09:55 1995
Path: grape.epix.net!news.sprintlink.net!cs.utexas.edu!swrinde!ihnp4.ucsd.edu!news1.ucsd.edu!news-mail-gateway
From: [e-mail] (JOHN DAY)
Newsgroups: rec.radio.amateur.homebrew
Subject: Modulating VCO's
Date: 12 Aug 95 00:57:15 GMT
Organization: OzEmail Pty Ltd
Lines: 55
Sender: JOHN DAY <[e-mail]>
Message-ID: <[e-mail]>
NNTP-Posting-Host: ucsd.edu
Originator: [e-mail]

It seems that the comments in relation to the original posting have
concentrated on 'other' methods of modulation, like using DSP's etc.

Generally modulation of a VCO in an FM transmitter is done in one of two ways.
But a quick bit of theory.

The PLL uses a filter which is essentially a low pass filter which removes the
high frequency noise and variations from the control voltage coming from the
phase locked loop controller. The frequencies below the cutoff frequency of
this filter are 'within the loop bandwidth'. And any frequency variations
detected by the controller wihtin this frequency range will be eliminated.

Every VCO has a 'modulation sensitivity' constant, which is usually expressed
in MHz/volt, i.e. MHz of frequency change per volt change incontrol voltage.
This value is not necessarilly constant, but can change over the frequency
range of the VCO. If a voltage is added to the loop control voltage, simply by
summing it resistively is a common practice, then this voltage will cause
changes in the VCO frequency. If the modulating signal is outside the loop
bandwidth then the mopdulation will appear at the output, if it is within the
loop bandwidth then the PLL controller will remove it form the signal and it
will NOT appear at the output.

Hence the need for 'two point' modulation schemes. The output frequency of the
PLL is directly related to the reference frequency of the loop. This is usually
provided by a crystal which is divided down to a much lower value in the IC's.
This crystal also establishes the stability and to a large extent the close in
frequency domain performance of the loop.

In order to modulate the loop at low frequencies, frequencies inside the loop
bandwidth you modulate the reference crystal as well as the loop itself! The
higher frequencies are passed to the VCO summing point and the lower
frequencies to the crystal. The trick is simply this, you need to carefully
design the filters and the level of modulation fed to each point to ensure that
their is a smooth transition from the reference modulation to the loop
modulation. This can be ab it of a trick!

But all is not necessarilly lost, the need for a single signal to modulate two
points is usually found only in high speed data radios, say for 9600bps packet
operation. Many commercial radios are two point modulated, the speech or
ordinary 1200/2400bps data is fed to the loop modulation point and the low
frequency CTCSS or whatever is fed to the reference modulation point.

Yell if you need any further help!

73 John Day VK3ZJF
[e-mail]
100236,[e-mail]










From [e-mail] Mon Aug 14 21:09:55 1995
Path: grape.epix.net!news.sprintlink.net!howland.reston.ans.net!swrinde!news.uh.edu!uuneo.neosoft.com!scooter-slip-b2.NeoSoft.com!jedent
From: [e-mail] (Joel E. Davis)
Newsgroups: rec.radio.amateur.homebrew
Subject: Motorola nicad specks??
Date: Sun, 13 Aug 1995 10:58:02 LOCAL
Organization: J.E. Davis Enterprises
Lines: 5
Message-ID: <[e-mail]>
NNTP-Posting-Host: scooter-slip-b2.neosoft.com
X-Newsreader: Trumpet for Windows [Version 1.0 Rev B final beta #4]

Could someone give me the AH cap of Motorola NTN 54488 (ALTERNATE TO NTN4825A
& NTN5448A) 10 volt NICAD? Also looking at the back of this batt there are
four(4) metal terms for charging. I need to know what they are for. I know the
left most one is + , next one unknown, next one - (neg), right most unknown.
Thanks Joel D.  K5ZCX


From [e-mail] Mon Aug 14 21:09:56 1995
Path: grape.epix.net!sc2c526a.ra.osd.mil!nova.sti.nasa.gov!lerc.nasa.gov!magnus.acs.ohio-state.edu!math.ohio-state.edu!howland.reston.ans.net!news-e1a.megaweb.com!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail
From: [e-mail] (N1DDZ RJC)
Newsgroups: rec.radio.amateur.homebrew
Subject: need dead plugin for FTV901R
Date: 11 Aug 1995 23:09:47 -0400
Organization: America Online, Inc. (1-800-827-6364)
Lines: 5
Sender: [e-mail]
Message-ID: <40h61r$[e-mail]>
Reply-To: [e-mail] (N1DDZ RJC)
NNTP-Posting-Host: newsbf02.mail.aol.com

If you happen to have a plug in for any band that goes with the FTV901R
transverter I'd like to buy it from you.  Since I want to build a 220
xverter, a blown out or otherwised damaged plug in is fine.
Bob Crowley, Staff Inventor
Input Devices, Wayland MA


From [e-mail] Mon Aug 14 21:09:57 1995
Path: grape.epix.net!news.sprintlink.net!in1.uu.net!nwfocus1.wa.com!news1.halcyon.com!coho.halcyon.com!mcraw
From: Marshall Craw <[e-mail]>
Newsgroups: rec.radio.amateur.equipment,rec.radio.amateur.homebrew,rec.radio.amateur.digital.misc
Subject: NEW HAM RADIO REMOTE CONTROL PRODUCT OFFERED
Date: Sun, 13 Aug 1995 15:51:33 -0700
Organization: Northwest Nexus Inc.
Lines: 30
Message-ID: <[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: coho.halcyon.com
Mime-Version: 1.0
Content-Type: TEXT/PLAIN; charset=US-ASCII
In-Reply-To: <[e-mail]>
Xref: grape.epix.net rec.radio.amateur.equipment:15797 rec.radio.amateur.homebrew:8939 rec.radio.amateur.digital.misc:10023


 I am pleased to announce a new product offered by Positive Time Systems
 called the RCS-I.  This is a radio controller that connects to any VHF/UHF
 transceiver and can issue x-10 commands. (X-10 is a power line standard
 for controlling devices throughout a building. Sears, Radio Shack, and
 others offer these compatible units)
  The unit also has an alarm input, a listen feature, a short voicmail box,
 and responds to all commands in a pleasant female voice. The system IDs
 with your recorded voice and call sign.  This description doesn't do the
 product justice, so please check out the new homepage at :

                 http://www.halcyon.com/pos.time.sys/top

 or you may email us with you address so that we can promptly send you
 our brochure and newsletter.

 NOTE: This product is intended for US voltages of 120 / 220 VAC.  Another
 version is offered to support other international power standards.

 FLASH! NEW FEATURE!  The RCS-I has a new feature called Secure Access
 Mode(SAM).  When enabled, the access code changes dozens of times per
 hour, making it virtually impossible to hack into.

 Thank You,

 Marshall Craw  <[e-mail]>
 Positive Time Systems
 North Bend, WA




From [e-mail] Mon Aug 14 21:09:57 1995
Path: grape.epix.net!news.sprintlink.net!news.clark.net!starport!brian.carling
Distribution: world
Newsgroups: rec.radio.amateur.homebrew
Subject: Phone Line Status Indicat
From: [e-mail] (Brian Carling)
Message-ID: <[e-mail]>
References: <40in01$[e-mail]>
Date: Sun, 13 Aug 1995 14:48:00 -0500
Organization: =ACE= ONLINE [phone]
Lines: 23

Newsgroups: rec.radio.amateur.homebrew
From: [e-mail]

Hi Kevin. I would like to make the same. If you get some info could you
let me know? (Assuming that they will EVENTUALLY repair the Internet
connection that gets us our inbound E-mail here)

E-mail has been down about 2 weeks or more now.

KW>I know this isn't Ham-related, but I figure with the tallent on this
KW>Newsgroup, I should be able to get an answer...

KW>I'm looking for a circuit that I can add to a phone/phone line to show
KW>if the line is in use. A simple LED would be just fine. The problem is
KW>that when I'm on the modem, no one in the  house knows it and may pick
KW>up the phone, bumping me off whatever I'm doing. A simple indicator
KW>would be just what I need.

KW>Thanks for the info... Kevin N1EPU
---
 ■ SLMR 2.1a ■ Why is it that the best taglines are always much too lon




From [e-mail] Mon Aug 14 21:09:58 1995
Path: grape.epix.net!news.sprintlink.net!simtel!news.kei.com!newshost.marcam.com!zip.eecs.umich.edu!caen!ranecurl
From: [e-mail] (Rane Curl)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Phone Line Status Indicat
Date: 14 Aug 1995 05:09:39 GMT
Organization: University of Michigan Engineering, Ann Arbor
Lines: 27
Sender: [e-mail]
Message-ID: <40mlqj$[e-mail]>
References: <40in01$[e-mail]> <[e-mail]>
NNTP-Posting-Host: ca.engin.umich.edu

In article <[e-mail]>,
Brian Carling <[e-mail]> wrote:
>Newsgroups: rec.radio.amateur.homebrew

>KW>I know this isn't Ham-related, but I figure with the tallent on this
>KW>Newsgroup, I should be able to get an answer...
>
>KW>I'm looking for a circuit that I can add to a phone/phone line to show
>KW>if the line is in use. A simple LED would be just fine. The problem is
>KW>that when I'm on the modem, no one in the  house knows it and may pick
>KW>up the phone, bumping me off whatever I'm doing. A simple indicator
>KW>would be just what I need.
>
>KW>Thanks for the info... Kevin N1EPU


There are simple circuits for detecting the off-hook condition. For
example, in _The Talking Telephone_ (Tab Books, 1990). Kits are
also available, often at hamfests. These use a separate 9V battery
since the phone company frowns upon users lighting their homes off
the phone battery.

I solved this problem by having another phone line installed. The
inconvenience to my net habits became much less important than the
amount of time I tied up the phone so others could not use it.

Rane Curl       N8REG


From [e-mail] Mon Aug 14 21:09:59 1995
Path: grape.epix.net!news.sprintlink.net!cs.utexas.edu!swrinde!howland.reston.ans.net!ix.netcom.com!netnews
From: [e-mail] (Kevin Webster)
Newsgroups: rec.radio.amateur.homebrew
Subject: Phone Line Status Indicator
Date: Sat, 12 Aug 1995 17:03:10 GMT
Organization: Netcom
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I know this isn't Ham-related, but I figure with the tallent on this
Newsgroup, I should be able to get an answer...

I'm looking for a circuit that I can add to a phone/phone line to show
if the line is in use. A simple LED would be just fine. The problem is
that when I'm on the modem, no one in the  house knows it and may pick
up the phone, bumping me off whatever I'm doing. A simple indicator
would be just what I need.

Thanks for the info... Kevin N1EPU




From [e-mail] Mon Aug 14 21:09:59 1995
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From: Matt Reilly <mhr>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Schematic Draw Program Recommendations?
Date: 13 Aug 1995 13:20:39 GMT
Organization: iii.net
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I can second the recommendation of PADS/PCB for DOS,
though the schematic capture isn't the nicest I've used,
just the nicest FREE stuff I've used.

Does anyone have a recommendation for a LINUX schematic
capture package?  There must be one out there.

                                matt (KB1VC)



From [e-mail] Mon Aug 14 21:10:00 1995
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From: [e-mail] (WB3U)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Schematic Draw Program Recommendations?
Date: Sun, 13 Aug 95 16:07:20 GMT
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In article <40ku7q$[e-mail]>, Matt Reilly <mhr> wrote:

>I can second the recommendation of PADS/PCB for DOS,
>though the schematic capture isn't the nicest I've used,
>just the nicest FREE stuff I've used.

I've been using an illustrator program program to draw occasional
schematics.  It's extremely tedious and time consuming.

Can you tell me where I can find the free software you mentioned?

Thanks & 73,

Jack  WB3U


From [e-mail] Mon Aug 14 21:10:00 1995
Path: grape.epix.net!usenet
From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: Transceiver "Tether"
Date: 13 Aug 1995 21:04:48 GMT
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   Sometimes... I use my cordless telephone to operate
my 2 meter transceiver. Very handy for when I need to
be in front of my computer (50' away in another room)
or when nature calls in the middle of a QSO!
   I designed the circuit about a year ago....and never
went any further with it. The guys on my favorite repeater
tell me it sounds great. (In fact they can't even tell when I'm
using it.)
  They call it the "Tether"., and they think I'm nuts for not
marketing it.  Maybe they're right.
  Is anybody interested?     Gene  K2LYU ([e-mail])


From [e-mail] Mon Aug 14 21:10:01 1995
Newsgroups: rec.radio.amateur.homebrew
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From: [e-mail] (Gale Carlisle)
Subject: TUBES  > JAN  --  EIA
X-Nntp-Posting-Host: cln.etc.bc.ca
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Originator: gcarlisl@cln
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Date: Fri, 11 Aug 1995 22:55:48 GMT
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        Would someone be able to supply me with common EIA numbers for
        these military JAN parts.

        6829
        5814A
        5687W
        5686
        417A
        6688
        6189W

        Thanks in advance      Steve Carlisle   VE7AHL


From [e-mail] Mon Aug 14 21:10:02 1995
Newsgroups: rec.radio.amateur.antenna,rec.radio.amateur.homebrew,rec.radio.amateur.misc
Path: grape.epix.net!news.sprintlink.net!in2.uu.net!vanbc.wimsey.com!io.org!torfree!aa005
From: [e-mail] (Colin McGregor)
Subject: Re: US Military Field Expedient Antennas
Message-ID: <[e-mail]>
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Organization: Toronto Free-Net
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References: <[e-mail]>
Date: Sat, 12 Aug 1995 17:06:07 GMT
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Xref: grape.epix.net rec.radio.amateur.antenna:12826 rec.radio.amateur.homebrew:8918 rec.radio.amateur.misc:84809

Peter Glibbery ([e-mail]) wrote:

[stuff deleted]

: I'm writing from the UK and the references mentioned in the manual are not at
: all easy to come by - I've tried.

: 1) In the case of some of these designs there is a need for a 'ground'. The

The word in the U.K. for 'ground' is 'earth'.

: diagrams in the manual show one end of a wire attached to a metal stake which
: is pushed into the ground, while the other end is attached to the radio set
: itself. Where on the radio set is the free end of the ground wire attached ? Is
: it attached to some kind of socket, or do you somehow attach it to the body of
: the radio set ?

Depends on make/model of radio, often a screw designed just for attaching
a grounding wire.

: 2) When using a 1/2-Rhombic the manual mentions that you feed the two 1/4 wave
: antenna elements from the centre using a 'coax'. What exactly is a 'coax' and
: how does it differ from the antenna wire itself ?

Coax is short for coaxial cable. A shielded cable (ie: conductor
surrounded by insulation, a shield (ie: a conductor), and more
insulation).

: 3) With the 1/2-Rhombic design the manual suggests that if a coax is not
: available to use a 'twisted pair'. What is a twisted pair ? My guess is two
: sheathed copper wires twisted together - but is this too simple a thought ?

Your guess is right re: twisted pair, two insulated wires twisted
together.

: 4) With the 1/2-Rhombic one end of the antenna wire is attached to a
: terminating resistor. The idea of this resistor is to give some
: directionality to the radio wave (I recognise that there is a difference
: between a resistor and an insulator (in the later case, the manual suggests a
: piece of wood or a C-ration spoon)). Does anyone have a good idea of what would
: make a good field expedient resistor ?

On this one you have got me.

Colin McGregor - VE3ZAA


From [e-mail] Mon Aug 14 21:10:03 1995
Path: grape.epix.net!news.sprintlink.net!newsfeed.internetmci.com!solaris.cc.vt.edu!mkeitz
From: [e-mail] (Mike Keitz)
Newsgroups: rec.radio.amateur.antenna,rec.radio.amateur.homebrew,rec.radio.amateur.misc
Subject: Re: US Military Field Expedient Antennas
Date: Sat, 12 Aug 95 18:20:46 GMT
Organization: TSE Systems
Lines: 27
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References: <[e-mail]> <[e-mail]>
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In article <[e-mail]>,
   [e-mail] (Colin McGregor) wrote:
>Peter Glibbery ([e-mail]) wrote:
>
>[stuff deleted]
[More stuff deleted]
[Need for resistor to load rhombic antenna]
>: piece of wood or a C-ration spoon)). Does anyone have a good idea of
what would
>: make a good field expedient resistor ?
>
>On this one you have got me.

* Carbon rod from dry-cell battery (not alkaline)  Resistance of these is
quite low (1-5 ohms)

* Pencil "lead", also likely to be too low in resistance to serve as
antenna load.

* Bare wires dipped in container of salt water.  Will not withstand DC or
much AC current flow without corrosion.  Also likely to corrode by itself,
depending on choice of materials.

* Antenna input of another receiver.

-Mike KD4QDM



From [e-mail] Mon Aug 14 21:10:03 1995
Path: grape.epix.net!news.sprintlink.net!in2.uu.net!tank.news.pipex.net!pipex!plug.news.pipex.net!pipex!dish.news.pipex.net!pipex!gwen.pcug.co.uk!kate.ibmpcug.co.uk!gbscomms!gordy
Newsgroups: rec.radio.amateur.antenna,rec.radio.amateur.homebrew,rec.radio.amateur.misc
Message-ID: <[e-mail]>
References: <[e-mail]><[e-mail]>
Reply-To: [e-mail] (Gordon B. Slater)
From: [e-mail] (Gordon B. Slater)
Date: Sun, 13 Aug 1995 14:37:45 GMT
Subject: Re: US Military Field Expedient Antennas
Lines: 13
Xref: grape.epix.net rec.radio.amateur.antenna:12853 rec.radio.amateur.homebrew:8936 rec.radio.amateur.misc:84853

>: 4) With the 1/2-Rhombic one end of the antenna wire is attached to a
>: terminating resistor. The idea of this resistor is to give some
>: directionality to the radio wave (I recognise that there is a difference
>: between a resistor and an insulator (in the later case, the manual suggests a
>: piece of wood or a C-ration spoon)). Does anyone have a good idea of what would
>: make a good field expedient resistor ?
>
>On this one you have got me.

iron wire is often used. at rf is has quite high resistance, but it varies
with wire type, condition (corrosion) etc.

Gordy

--
Caution: Keys now changed at random security intervals.
Contact for current armoured transport file.

"You are reminded that this is an insecure circuit. The use of names,
ranks and classified information is forbidden."





From [e-mail] Mon Aug 14 21:10:04 1995
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From: [e-mail] (IBM Del F)
Newsgroups: rec.radio.amateur.antenna,rec.radio.amateur.homebrew,rec.radio.amateur.misc
Subject: Re: US Military Field Expedient Antennas
Date: 14 Aug 1995 00:33:35 -0400
Organization: America Online, Inc. (1-800-827-6364)
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You can also use a standard 'lead' (graphite core) pencil.   Attach a wire
at each end where you expose the core (alligator clips?).  The amount of
resistance will vary with the graphite core length, density, diameter.
You can increase the resistance by filing through the pencil more or less
in the middle but just don't cut all the way through the core or you've
ruined it..  The deeper the cut into the graphite core, the higher the
resistance, BUT, you will lower the amount of power it can dissipate at
that point. The assumption here is that you have some means of determining
the resistance as you file into the core if you are concerned about a
specific value such as 600 Ohms.

Del, KD4B
Raleigh, NC


From [e-mail] Mon Aug 14 21:10:05 1995
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From: Jim Hendrickson <[e-mail]>
Newsgroups: rec.radio.amateur.antenna,rec.radio.amateur.homebrew,rec.radio.amateur.misc
Subject: Re: US Military Field Expedient Antennas
Date: 14 Aug 1995 01:27:38 GMT
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The terminating resistor is 600 ohms, non inductive.



From [e-mail] Mon Aug 14 21:10:05 1995
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From: [e-mail] (WB3U)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Using ZN414 to receive SSB
Date: Mon, 14 Aug 95 06:44:46 GMT
Lines: 19
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   [e-mail] (Ian Mitchell) wrote:

>The ZN414 is essentialy an RF amplifier and detector with
>built in AGC. The problem is how to resolve SSB? Generating
>a 455KHz BFO is no problem (using TTL levels), and can be
>arranged to switch on and off via uP control.
>
>I am hesitant of providing a direct BFO signal (not TTL) to
>the ZN414 for fear of overloading it.

I'm not familiar with the specifics of the ZN414, but the built in
AGC might be the most difficult problem.  If it's keyed to the
detector, you may have a difficult time keeping the BFO from
activating the AGC and reducing receiver gain.

73,

Jack  WB3U


From [e-mail] Mon Aug 14 21:10:06 1995
Path: grape.epix.net!news.sprintlink.net!simtel!harbinger.cc.monash.edu.au!newsroom.utas.edu.au!news
From: [e-mail] (Ian Mitchell)
Newsgroups: rec.radio.amateur.homebrew
Subject: Using ZN414 to receive SSB
Date: 14 Aug 1995 04:19:35 GMT
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Hi,

I'm trying to design a general coverage receiver using
the MC3362 from motorola. I'd like it to receive AM, FM
and SSB/CW signals. FM is built in, and I'd like to think
I can use the ZN414 for AM, by tapping in to the signal
at the output of the second IF filter (455KHz).

The ZN414 is essentialy an RF amplifier and detector with
built in AGC. The problem is how to resolve SSB? Generating
a 455KHz BFO is no problem (using TTL levels), and can be
arranged to switch on and off via uP control.

I am hesitant of providing a direct BFO signal (not TTL) to
the ZN414 for fear of overloading it.

I thought of using the BFO signal to switch the SSB signal on
and off at 455KHz. Another 455KHz IF filter would be used
to reduce harmonics, just before the ZN414.

The question is, would this work?

Best regards to all, Ian



From [e-mail] Mon Aug 14 21:10:07 1995
Path: grape.epix.net!news.sprintlink.net!dispatch.news.demon.net!demon!pinetree
From: [e-mail] (WB3U)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: VFO stability
Date: Sat, 12 Aug 95 19:29:33 GMT
Lines: 30
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   [e-mail] (Roy W Lewallen) wrote:

>This has been an interesting thread, and the comments seem to
>generally agree with what I've believed for some time:
    <snip>
>3. I suspect but haven't confirmed that inductor drift decreases
pretty much as Q increases. Therefore, a good-sized air-core inductor
would reasonably drift less

I've noticed that too.  I wonder if the explanation could be that a
larger conductor incurs less IR loss, and is also better able to
dissipate the minute amount of heat that's generated from this source?

Much excellent information has been published on this subject, but I
haven't seen any in quite some time.  I think many of the tried and
true principles that used to be applied have been gradually displaced
by the desire to build ever-smaller components.  The advent of
synthesizers has also had an effect on the popularity of this
material.

Some of the best information on VFO stability was published in the
60's, a time when VFO builders were still faced with the effects of
tube heat and changing operating characteristics.  The same methods
used then still hold true, and solid-state gear can take even better
advantage of them.  The trick is finding the info.

73,

Jack


From [e-mail] Mon Aug 14 21:10:08 1995
Path: grape.epix.net!news.sprintlink.net!psgrain!nntp.teleport.com!usenet
From: [e-mail] (Roy Lewallen)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: VFO stability
Date: 13 Aug 1995 04:28:12 GMT
Organization: ELNEC/EZNEC Software
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>   [e-mail] (WB3U) writes:
>     [e-mail] (Roy W Lewallen) wrote:

>  >This has been an interesting thread, and the comments seem to
>  >generally agree with what I've believed for some time:
>      <snip>
>  >3. I suspect but haven't confirmed that inductor drift decreases
>  pretty much as Q increases. Therefore, a good-sized air-core inductor
>  would reasonably drift less

>  I've noticed that too.  I wonder if the explanation could be that a
>  larger conductor incurs less IR loss, and is also better able to
>  dissipate the minute amount of heat that's generated from this source?

> . . .

This stands to reason. Everything else being equal, a higher-Q inductor
will generate less heat than a lower-Q one. But all else is seldom equal.
The effect of heating is to change the physical dimensions of the coil,
which in turn changes the inductance. I would imagine there could be
quite a difference in inductance change as a function of temperature
depending on the shape of the inductor and the expansion
characteristics of the form, if any. Also, as you mention, the amount
of temperature rise which results from the heat depends on the heat
sinking/dissipating ability of the coil.

Hmmm. . . wonder if a shape could be found such that the inductance is
constant if all dimensions change in an equal ratio. I'm sure somebody
thought of this a generation or two ago. . .

Roy Lewallen, W7EL
[e-mail]




From [e-mail] Mon Aug 14 21:10:09 1995
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From: [e-mail] (W8JI  Tom)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: VHF Coaxial Collinear Plans Wanted
Date: 12 Aug 1995 12:12:01 -0400
Organization: America Online, Inc. (1-800-827-6364)
Lines: 20
Sender: [e-mail]
Message-ID: <40ijsh$[e-mail]>
References: <1995Aug10.111431.1@noah>
Reply-To: [e-mail] (W8JI  Tom)
NNTP-Posting-Host: newsbf02.mail.aol.com

Dave,

>I need some construction advice on coaxial collinear VHF antennas (you
>know, built out of RG/8 or similar).  My references (the 1994 ARRL
>Antenna Book, the 1994 ARRL Handbook and an older ARRL Antenna
>Anthology) are mute on this subject.

The reason they are now mute is the early articles (in QST and the
Handbooks) were non-functioning antennas. The problem was the velocity of
propagation inside the cable and for the parallel radiating surface
currents were different. The phase was changed every 1/2 wl for the
transmission line currents but the radiating currents didn't change at the
correct phase intervals. So the antennas simply didn't work at all, even
though they were published and had lengthy explainations of how well they
worked.

Why not build a skirt collinear or a phased stacked dipole array?

73 Tom



From [e-mail] Mon Aug 14 21:10:09 1995
Newsgroups: rec.radio.amateur.homebrew
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From: [e-mail] (Ken Navarre)
Subject: Re: WTB: Perimeter Intrusion Alarms
Message-ID: <[e-mail]>
Organization: Public Seismic Network, San Jose, Ca.
X-Newsreader: TIN [version 1.2 PL1]
References: <[e-mail]> <[e-mail]>
Date: Fri, 11 Aug 1995 21:54:12 GMT
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Leon Heller ([e-mail]) wrote:

: I vaguely remember reading that they experimented with intrusion alarms
: using bed-bugs. When anyone was in the vicinity and presumably producing CO2
: or whatever it is that bed-bugs detect, the bugs got excited and started
: jumping up and down. The movement was detected and triggered the Tx.

I recall reading an article about that. Believe that it was the result of
a study done by Behavorial Sciences in D.C. was one of the "think tanks"
in the '70s.

Ken
--


From [e-mail] Mon Aug 14 21:10:10 1995
Path: grape.epix.net!news.sprintlink.net!newsfeed.internetmci.com!solaris.cc.vt.edu!mkeitz
From: [e-mail] (Mike Keitz)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: WTB: Perimeter Intrusion Alarms
Date: Sat, 12 Aug 95 15:37:22 GMT
Organization: TSE Systems
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In article <[e-mail]>, [e-mail] (Ken Navarre) wrote:
>Leon Heller ([e-mail]) wrote:
>
>: I vaguely remember reading that they experimented with intrusion alarms
>: using bed-bugs. When anyone was in the vicinity and presumably producing
CO2
>: or whatever it is that bed-bugs detect, the bugs got excited and started
>: jumping up and down. The movement was detected and triggered the Tx.
>
>I recall reading an article about that. Believe that it was the result of
>a study done by Behavorial Sciences in D.C. was one of the "think tanks"
>in the '70s.

Maybe not as far-fetched as attempts to chemically detect the pungent-
smelling "fish sauce" eaten by the VC (as well as most Vietnamese I
suppose) to detect when the enemy was near.  As I remember (thirdhand), the
technology did not work out.  I think I have a couple of receivers for an
Army intrusion detection system of some sort, they appear to operate on
149.6 MHz NBFM with some sort of digital code.  The transmitter part could
be excellent for foxhunting if nothing else.

-Mike KD4QDM


From [e-mail] Mon Aug 14 21:10:11 1995
Newsgroups: rec.radio.amateur.homebrew
Path: grape.epix.net!news.sprintlink.net!howland.reston.ans.net!ix.netcom.com!netcom.com!kjn
From: [e-mail] (Ken Navarre)
Subject: Re: WTB: Perimeter Intrusion Alarms
Message-ID: <[e-mail]>
Organization: Public Seismic Network, San Jose, Ca.
X-Newsreader: TIN [version 1.2 PL1]
References: <[e-mail]>
Date: Sun, 13 Aug 1995 04:59:42 GMT
Lines: 13
Sender: [e-mail]

I wrote:
: I'm looking for some of the Vietnam era military surplus seismic
: perimeter intrusion alarms.

Wanted to thank all the folks who offered suggestions for locating some
of these critters. I picked up a set of "new" condition ones at the
Foothill College Swap Meet this morning. 4 transmitters and a receiver.
Works great!

Thanks again!
73s
Ken  KC6IFF
--


From [e-mail] Mon Aug 14 21:10:11 1995
Newsgroups: rec.radio.amateur.homebrew
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From: [e-mail] (Mike Morris)
Subject: Re: WTB: Perimeter Intrusion Alarms
Message-ID: <[e-mail]>
Organization: College Park Software, Altadena, CA
Date: Sun, 13 Aug 1995 07:28:41 GMT
Lines: 29

[e-mail] (Mike Keitz) writes:

>In article <[e-mail]>, [e-mail] (Ken Navarre) wrote:
>>Leon Heller ([e-mail]) wrote:
>>
>>: I vaguely remember reading that they experimented with intrusion alarms
>>: using bed-bugs. When anyone was in the vicinity and presumably producing
>CO2
>>: or whatever it is that bed-bugs detect, the bugs got excited and started
>>: jumping up and down. The movement was detected and triggered the Tx.

I heard the story as the bedbugs began to alert their fellows with sound-
only the noise was at ultrasonic frequencies.  The detector was tuned to
a broad range of ultrasonics and triggered the TX.

>technology did not work out.  I think I have a couple of receivers for an
>Army intrusion detection system of some sort, they appear to operate on
>149.6 MHz NBFM with some sort of digital code.  The transmitter part could
>be excellent for foxhunting if nothing else.

I have one of the TX's somewhere aroudn here.  It is packeged in a very
interesting manner.

Mike Morris   WA6ILQ          | All opinions must be my own since nobody
PO Box 1130                   | pays me enough to be their mouthpiece...
Arcadia, CA. 91077            |
ICBM: 34.07.930N, 118.03.799W | Reply to: [e-mail]
--



From [e-mail] Mon Aug 14 21:10:12 1995
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From: [e-mail] (Sergei Kulyov)
Newsgroups: rec.radio.amateur.homebrew
Subject: WTB:small air vary capacitors
Date: 14 Aug 1995 01:04:21 -0400
Organization: The Greater Columbus FreeNet
Lines: 8
Message-ID: <40mlgl$[e-mail]>
NNTP-Posting-Host: acme.freenet.columbus.oh.us
X-Newsreader: TIN [version 1.2 PL2]


I'm looking for the small air vary capacitors with C max about
1000 pf. The QTY up to four (4).

Appreciate for any help.

73! Sergei AA8OT, UA3AP
Columbus, Ohio


From [e-mail] Fri Aug 18 14:56:39 1995
Path: grape.epix.net!sc2c526a.ra.osd.mil!nova.sti.nasa.gov!lerc.nasa.gov!magnus.acs.ohio-state.edu!math.ohio-state.edu!howland.reston.ans.net!ix.netcom.com!netnews
From: [e-mail]
Newsgroups: rec.antiques.radio+phono,rec.audio.marketplace,rec.radio.swap,rec.radio.amateur.homebrew
Subject: ***** FS Tubes, Tubes, Tubes ******
Date: Wed, 16 Aug 1995 20:34:55 GMT
Organization: Netcom
Lines: 24
Message-ID: <40tga6$[e-mail]>
NNTP-Posting-Host: ix-den12-12.ix.netcom.com
X-Newsreader: Forte Agent .99.82
Xref: grape.epix.net rec.audio.marketplace:18846 rec.radio.swap:41608 rec.radio.amateur.homebrew:8989

     We have tens of thousands of tubes For Sale.  The old 4-5-6 & 7
pin tubes, octales, 7 & 9 pin minature tubes.  For radios TVs,
industrial equinment, & test equipment.

     We have both NEW and USED/SURPLUS tubes that have been tested and
are guaranteed.

     Send us a e-mail note with what you need...and we will reply with
price (our low price) and availability.

     In a hurry?

     Call us at 303-274-7545
     FAX us at 303-274-2317

     e-mail   [e-mail]

     visa & mastercard welcome

     no minimum order

     ***** WE SHIP WORLD WIDE *****




From [e-mail] Fri Aug 18 14:56:40 1995
Newsgroups: rec.radio.amateur.homebrew
Path: grape.epix.net!sc2c526a.ra.osd.mil!nova.sti.nasa.gov!lerc.nasa.gov!magnus.acs.ohio-state.edu!math.ohio-state.edu!howland.reston.ans.net!tank.news.pipex.net!pipex!sunsite.doc.ic.ac.uk!yama.mcc.ac.uk!thor.cf.ac.uk!thor!spx3atw
From: Andrew Webb <[e-mail]>
Subject: 48 MHz circuit. please take a look
Sender: [e-mail] (USENET News System)
Message-ID: <Pine.OSF.3.91.950816162859.7470B-100000@thor>
X-Sender: spx3atw@thor
Date: Wed, 16 Aug 1995 15:37:49 GMT
X-Nntp-Posting-Host: thor
Content-Type: TEXT/PLAIN; charset=US-ASCII
Mime-Version: 1.0
Organization: Cardiff University of Wales
Lines: 24

A circuit for a 48 MHz TX unit has been uploaded to
http://www.cf.ac.uk/uwcc/suon/radio/badger.gif

PLease could you take a look, and tell me what you think?
The circuit is a 12 MHz crystal osc. followed by a tuned buffer stage,
two doubler stages and a driver stage. Output is from the wire that
disappears off the right hand side of the screen.

The values of the inductors is not included on the diagram. they have
been calculated to be resonant at 12, 24, and 48 mhz as
appropriate.
The inductor in the driver stage is made up of three white Toko S18 air
cored coils in series


Thanks in advance

Andrew Webb, GERME

----------------------------------------------------------
Remember, Be yourself, cos if you're not you, WHO ARE YOU?
----------------------------------------------------------




From [e-mail] Fri Aug 18 14:56:40 1995
Path: grape.epix.net!sc2c526a.ra.osd.mil!nova.sti.nasa.gov!lerc.nasa.gov!magnus.acs.ohio-state.edu!math.ohio-state.edu!howland.reston.ans.net!news.sprintlink.net!in2.uu.net!psinntp!psinntp!psinntp!psinntp!bah.com!user
From: [e-mail] (Roberto Bacca)
Newsgroups: rec.radio.amateur.homebrew
Subject: A place to download schemtics/fun electronics projects
Date: Tue, 15 Aug 1995 20:07:52 -0600
Organization: Booz Allen & Hamilton
Lines: 10
Distribution: world
Message-ID: <AC56AF18966862286@128.229.243.2>
NNTP-Posting-Host: 128.229.243.20

Does anyone know of an FTP site wherei can download Schematics/Electoincs
projects.

If you do please E-Mail me at:

    [e-mail]






From [e-mail] Fri Aug 18 14:56:41 1995
Path: grape.epix.net!news.sprintlink.net!sunic!sunic.sunet.se!newsfeed.tip.net!news.algonet.se!usenet
From: [e-mail] (Christer Johansson)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: A place to download schemtics/fun electronics projects
Date: Wed, 16 Aug 1995 20:48:19 GMT
Organization: HTH
Lines: 17
Message-ID: <40tlmc$[e-mail]>
References: <AC56AF18966862286@128.229.243.2>
Reply-To: [e-mail]
NNTP-Posting-Host: sophocles.algonet.se
X-Newsreader: Forte Free Agent 1.0.82

[e-mail] (Roberto Bacca) wrote:

>Does anyone know of an FTP site wherei can download Schematics/Electoincs
>projects.

Try ftp.ee.ualberta.ca in the /pub/cookbook directory.

/Christer


-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
 * High Tech Horizon - Christer Johansson - * email: [e-mail] *
-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
 * Vi saljer Parallax, Inc. BASIC Stamp's produkter i Skandinavien *
    >> World Wide Web - http://www.algonet.se/~cj/catalog.html <<
-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-



From [e-mail] Fri Aug 18 14:56:42 1995
Path: grape.epix.net!sc2c526a.ra.osd.mil!nova.sti.nasa.gov!lerc.nasa.gov!magnus.acs.ohio-state.edu!freenet.columbus.oh.us!pacific.mps.ohio-state.edu!math.ohio-state.edu!howland.reston.ans.net!news.sprintlink.net!news.chattanooga.net!usenet
From: [e-mail] (Brian Wagner)
Newsgroups: rec.radio.amateur.homebrew
Subject: August QST Rock Bender Receiver
Date: 16 Aug 1995 20:07:25 GMT
Organization: Chattanooga Online
Lines: 5
Message-ID: <40tj5t$[e-mail]>
NNTP-Posting-Host: portb03.chattanooga.net
Mime-Version: 1.0
X-Newsreader: WinVN 0.93.11

I am trying to build this thing and I cannot get hold of Y1 (a 7Mhz
crystal supposily sold by Ocean State Electronics).  The phone number in
QST is wrong.  Also where do you get a Mini-Circuits SBL-1 Mixer?  Any
help would be greatly appreciated.



From [e-mail] Fri Aug 18 14:56:43 1995
Path: grape.epix.net!sc2c526a.ra.osd.mil!nova.sti.nasa.gov!lerc.nasa.gov!usenet.ins.cwru.edu!gatech!howland.reston.ans.net!news.sprintlink.net!in1.uu.net!news.sandia.gov!tesuque.cs.sandia.gov!news.zynet.com!ez0!pagesat.net!a3bsrv.nai.net!mgate.arrl.org!mgate.arrl.org!not-for-mail
From: [e-mail] (Mike Tracy)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: August QST Rock Bender Receiver
Date: 17 Aug 1995 08:33:14 -0400
Organization: American Radio Relay League
Lines: 15
Message-ID: <40vcua$[e-mail]>
References: <40tj5t$[e-mail]>
NNTP-Posting-Host: mgate.arrl.org
X-Newsreader: TIN [version 1.2 PL2]

Brian Wagner ([e-mail]) wrote:
: I am trying to build this thing and I cannot get hold of Y1 (a 7Mhz
: crystal supposily sold by Ocean State Electronics).  The phone number in
: QST is wrong.  Also where do you get a Mini-Circuits SBL-1 Mixer?  Any
: help would be greatly appreciated.

Brian,
        The phone number in QST is off by one digit - the area code should
be 401, rather than 400 (ie., 401-596-3080).

Note to folks trying to reach Ocean State - their 800 number is no longer in
service. Also note that they are swamped with orders whenever their number
is published, so if you can't get through (busy or no answer), keep trying.

73 de Michael, KC1SX, ARRL Technical Information Services


From [e-mail] Fri Aug 18 14:56:43 1995
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From: [e-mail] (Roland B. Burgan)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Calibration of Freq.Counter
Date: 17 Aug 1995 15:07:42 GMT
Organization: The Greater Detroit Free-Net
Lines: 11
Message-ID: <40vlvu$[e-mail]>
NNTP-Posting-Host: detroit.freenet.org


One other method that works well is to build a simple 10 Mhz
oscillator with a buffer stage. Use a T coax adaptor on the
output to drive a piece of wire for the WWV rcvr, and a direct
connection to the counter.  Zero beat the oscillator, easier
brecause of the stronger signal, and adjust the counter when
audio beat is no longer flucuating (watch S-Meter on rcvr.)
This method will allow you to input a signal directly to the
counter on any range input, and adjust even the divide by
256 prescalers (3.90425 Mhz crystals).
--


From [e-mail] Fri Aug 18 14:56:44 1995
Path: grape.epix.net!news.sprintlink.net!in2.uu.net!psinntp!psinntp!psinntp!psinntp!bah.com!user
From: [e-mail] (Roberto Bacca)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Can Schems/Diags be Posted here? *.uue??
Date: Thu, 17 Aug 1995 01:52:32 -0600
Organization: Booz Allen & Hamilton
Lines: 36
Distribution: world
Message-ID: <AC58516096682DAC5@128.229.243.2>
References: [e-mail]> <[e-mail]> <40bd1d$[e-mail]> <40d8ap$[e-mail]> <40dkoi$[e-mail]> <[e-mail]> <[e-mail]>
NNTP-Posting-Host: 128.229.243.20

In article <[e-mail]>,
[e-mail] (WB3U) wrote:

>   [e-mail] (Mark Zenier) wrote:
>
>>Anything posted to some groups gets transfered though channels that
>>charge by volume.
>    <snip>
>>These recipients have no option.  They get no preview of the traffic.
>>They end up paying, whether the posting is useful to them or not.
>
>Now that's a valid reason.  Of course, it leads to the question of how
>to distribute a useful binary.  I'm lucky enough to have a personal
>anon FTP area available through my service provider, but that's not
>always the case.  Also, e-mail can be a real pain if too many folks
>want a copy.  Any suggestions for a work-around, other than starting a
>new group?
>
>73,
>
>Jack  WB3U




With the quantity  of knowledge and the buying power of this group, we
should send a letter to a company like Motorola, Radio Shack MCM
electronics etc., and ask them if they would found a web server to store,
post, schematics, they could also advertise their parts, new products etc.
after all they already have an Internet connection (I╒m assuming) they
would only need a server. Any Ideas

[e-mail]





From [e-mail] Fri Aug 18 14:56:46 1995
Newsgroups: rec.radio.amateur.homebrew
Path: grape.epix.net!sc2c526a.ra.osd.mil!nova.sti.nasa.gov!lerc.nasa.gov!magnus.acs.ohio-state.edu!math.ohio-state.edu!howland.reston.ans.net!europa.chnt.gtegsc.com!news.umbc.edu!cs.umd.edu!news.coop.net!news.den.mmc.com!NewsWatcher!user
From: [e-mail] (Booth, Thomas G)
Subject: Re: cross reference semiconductors.
Message-ID: <thomas.g.booth-160895173608@160.205.101.24>
Followup-To: rec.radio.amateur.homebrew
Sender: [e-mail] (News Admin)
Nntp-Posting-Host: 160.205.101.24
Organization: A Turbulent One
References: <40g9p6$[e-mail]> <40gn2o$[e-mail]> <40ipvj$[e-mail]>
Distribution: usa
Date: Thu, 17 Aug 1995 01:02:28 GMT
Lines: 53

In article <40ipvj$[e-mail]>, dan drumm <drumm> wrote:
>
> [e-mail] (Gary V. Deutschmann, Sr.) wrote:

(snip)

> >Tip-120s are very common, the NTE number is the generic number for this
> >transistor, usually an ECG number would be the same number.  ECGs number is
> >261.
> >
> >If you keep parts the way I do, I finally put every transistor in sorted
> >envelopes under the ECG number for that part.  That way finding them is
> >easy.
>
> OK, a very simple idea.  That's the best kind!  I guess I'll have to
> sit down for an afternoon and enter part numbers.  I'll cross them
> all to NTE since I have that program handy.
>

Doing this is indeed an excellent idea.  However, one needs to remember
that oftentimes the NTE part may have significantly higher ratings than the
original part.  For example, the 1N4001 through 1N4005 diodes crosslist to
the same NTE part (NTE 116), which w/ its 600 V PIV rating can be used as a
single substitute for these JEDEC parts.  Having a bunch of 1N4001 through
1N4005 parts in a bin marked "NTE 116" is OK, but mindlessly grabbing a
1N4001 out of the bin for use in a circuit where a 400 V PIV rated device
is called for could result in a failed circuit.  My point is, be aware of
reduced component ratings if you mix together a bunch of different parts in
a bin.  You could try segregation of parts within your bins (through
bagging or other means) to help prevent putting a "runt" part in a circuit.

As another poster suggested in this thread, there are other crosslisting
resources available.  I've used NTE, ECG & SK cross reference guides for
years, and I've also used the old Raytheon REN and Motorola HEP guides as
well.  Sams has published transistor substitution books in the past, and
I'd recommend getting your hands on one.  There's a shareware tool for IBM
PCs called SCRL (can't remember the exact name corresponding to the acronym
@ the moment); I believe you can find it on the SimTel mirrors or on other
ftp sites - look for a file named scrl50.zip.  Sometimes, old
manufacturers' databooks can be useful - for instance, the mid '60s
Motorola databooks had a fairly complete listing of 1N & 2N parts (for that
time), the minimum characteristics of each JEDEC part, & some Motorola
recommended substitutes for a given part.  Some databooks (such as
Siliconix and old Sprague books) give good clues to devices which share a
common fabrication process, and could be an alternate cross reference
source.  You might also consider getting your hands on some Japanese
transistor specification books, such as the ones MCM Electronics has sold
periodically; such books may be the only way to get device ratings for a
2Sx part if you can't find it listed in the usual cross reference guides.

TGB

\\ The opinions expressed herein are my own. //


From [e-mail] Fri Aug 18 14:56:46 1995
Path: grape.epix.net!sc2c526a.ra.osd.mil!nova.sti.nasa.gov!lerc.nasa.gov!magnus.acs.ohio-state.edu!math.ohio-state.edu!howland.reston.ans.net!vixen.cso.uiuc.edu!news.uoregon.edu!newsadmin
From: Gary Davis <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Divide by ten front end for frequency counter
Date: 16 Aug 1995 02:33:53 GMT
Organization: University of Oregon
Lines: 7
Message-ID: <40rleh$[e-mail]>
NNTP-Posting-Host: cisco-ts5-line24.uoregon.edu

My frequency counter tops out at 30Mhz.  I would like to build a
divide by ten front end to increase the range to 300Mhz. Can anyone
refer me to a schematic that would serve this purpose? Any and all replies
will be most appreciated.

Regards,
Gary Davis


From [e-mail] Fri Aug 18 14:56:47 1995
Path: grape.epix.net!news.sprintlink.net!howland.reston.ans.net!torn!nott!nrcnet0.nrc.ca!ratilal
From: [e-mail] (Peter Orban)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Divide by ten front end for frequency counter
Date: 16 Aug 1995 13:53:34 GMT
Organization: National Research Council of Canada
Lines: 19
Distribution: world
Message-ID: <40st8u$[e-mail]>
References: <40rleh$[e-mail]>
NNTP-Posting-Host: nrcamt.ime.nrc.ca
X-News-Reader: VMS NEWS 1.13
In-Reply-To: Gary's message of 16 Aug 1995 02:33:53 GMT

In <40rleh$[e-mail]> Gary writes:

> My frequency counter tops out at 30Mhz.  I would like to build a
> divide by ten front end to increase the range to 300Mhz. Can anyone
> refer me to a schematic that would serve this purpose? Any and all replies
> will be most appreciated.
>

Those circuits usually use a 11C90 which is an ECL circuit with TTL interface,
if I am correct.
Does anyone know who sells that chip in small quantities as well as the Harris
(Intersil) ICM7216 series chips?

Thanks, Peter
--
Peter Orban
National Research Council of Canada
Internet: [e-mail]



From [e-mail] Fri Aug 18 14:56:47 1995
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From: [e-mail] (David Hutchinson)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Divide by ten front end for frequency counter
Date: 17 Aug 1995 13:21:40 GMT
Organization: CSE2, DRA Malvern, England, UK
Lines: 6
Distribution: world
Message-ID: <[e-mail]>
References: <40rleh$[e-mail]> <40st8u$[e-mail]>
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Mime-Version: 1.0
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In-reply-to: [e-mail]'s message of 16 Aug 1995 13:53:34 GMT


ARRL 1991 handbook has a nice counter front-end, with a MMIC amplifier before
the divider. I'm using this, except I use two MAV-3 amps, as they were to hand.
I get about 10-20 mV rms upto 550 MHz.

--David G8SQH


From [e-mail] Fri Aug 18 14:56:48 1995
Path: grape.epix.net!sc2c526a.ra.osd.mil!nova.sti.nasa.gov!lerc.nasa.gov!news.larc.nasa.gov!news.msfc.nasa.gov!europa.chnt.gtegsc.com!ulowell.uml.edu!vtc.tacom.army.mil!news1.oakland.edu!detroit.freenet.org!detroit.freenet.org!rburgan
From: [e-mail] (Roland B. Burgan)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Divide by ten front end for frequency counter
Date: 17 Aug 1995 15:14:53 GMT
Organization: The Greater Detroit Free-Net
Lines: 8
Message-ID: <40vmdd$[e-mail]>
NNTP-Posting-Host: detroit.freenet.org


I have been informed by a number of sources that the 11C90 is no
longer available.  I have not seen any divide by 10 (or 100)
IC's available for some time, now. Check with some surplus
equipment dealers for used counter converters, such as
Tucker Electronics  (ask for the test equipment catalog)
(they also have a general electronics,communications catalog).
--


From [e-mail] Fri Aug 18 14:56:48 1995
Path: grape.epix.net!sc2c526a.ra.osd.mil!nova.sti.nasa.gov!lerc.nasa.gov!magnus.acs.ohio-state.edu!math.ohio-state.edu!howland.reston.ans.net!newsfeed.internetmci.com!usenet.eel.ufl.edu!col.hp.com!canyon.sr.hp.com!donrm
From: [e-mail] (Don Montgomery)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Divide by ten front end for frequency counter
Date: 17 Aug 1995 20:17:38 GMT
Organization: Hewlett Packard Sonoma County
Lines: 10
Message-ID: <410852$[e-mail]>
References: <40rleh$[e-mail]>
NNTP-Posting-Host: mtleng02.sr.hp.com
X-Newsreader: TIN [version 1.2 PL2]

Gary Davis ([e-mail]) wrote:
> My frequency counter tops out at 30Mhz.  I would like to build a

Try the Motorola MC12080; a 1.1GHz prescaler that will divide by
10,20,40 or 80.  Runs off 5 volts, consumes 3.7 mA, in a 8 pin
plastic DIP or SOIC.  Operating window looks like it might make it
down to 2 meters.

Don Montgomery, K6LTS
[e-mail]


From [e-mail] Fri Aug 18 14:56:49 1995
Path: grape.epix.net!sc2c526a.ra.osd.mil!nova.sti.nasa.gov!lerc.nasa.gov!magnus.acs.ohio-state.edu!freenet.columbus.oh.us!pacific.mps.ohio-state.edu!math.ohio-state.edu!howland.reston.ans.net!EU.net!news.sprintlink.net!in1.uu.net!news.ultranet.com!amber1.ultranet.com!user
From: [e-mail] (Jon Goguen)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Divide by ten front end for frequency counter
Date: 18 Aug 1995 03:06:08 GMT
Organization: UltraNet Communications, Inc.
Lines: 31
Message-ID: <[e-mail]>
References: <40vmdd$[e-mail]>
NNTP-Posting-Host: amber1.ultranet.com
X-Newsreader: Value-Added NewsWatcher 2.0b22.0+

In article <40vmdd$[e-mail]>, [e-mail]
(Roland B. Burgan) wrote:

> I have been informed by a number of sources that the 11C90 is no
> longer available.  I have not seen any divide by 10 (or 100)
> IC's available for some time, now. Check with some surplus
> equipment dealers for used counter converters, such as
> Tucker Electronics  (ask for the test equipment catalog)
> (they also have a general electronics,communications catalog).
> --

Motorola makes an ECL part called a universal hexadecimal counter
(MC10H136P, $12.54 in single quanity according to a recent Newark
catalog).  As I understand it, this counter can be used as a programmable
divider with the divisor having any desired value between 1 and 256,
including 10. This is done by presetting the counter with a (binary
equivalent) value of 256-(desired divisor), and then counting the carry
output.  Each time the counter rolls over, it resets to the preset value,
and counts from there to 256. It would be easy to make a switchable divide
by 10--divide by 100 counter by switching the preset between 246 and 156.
This counter works up to 550 MHz if I remember the spec. correctly.

Good luck!

Jon

--
Jon Goguen

"Nothing worth knowing can be understood by the human mind."



From [e-mail] Fri Aug 18 14:56:50 1995
Path: grape.epix.net!sc2c526a.ra.osd.mil!nova.sti.nasa.gov!lerc.nasa.gov!magnus.acs.ohio-state.edu!math.ohio-state.edu!howland.reston.ans.net!agate!news.mindlink.net!news
From: [e-mail] (jim pestell)
Newsgroups: rec.radio.amateur.homebrew
Subject: Drake TR7
Date: Thu, 17 Aug 1995 02:27:53 GMT
Organization: MIND LINK! - British Columbia, Canada
Lines: 5
Message-ID: <40u9gs$[e-mail]>
NNTP-Posting-Host: line156.nwm.mindlink.net
X-Newsreader: Forte Free Agent 1.0.82

I have a Drake tr7 and wish to put it on the new 17 and 12 meter
bands, some one heard that it is just a simple matter of cutting out 2
diods, any one know about this??




From [e-mail] Fri Aug 18 14:56:50 1995
Path: grape.epix.net!sc2c526a.ra.osd.mil!nova.sti.nasa.gov!lerc.nasa.gov!magnus.acs.ohio-state.edu!math.ohio-state.edu!cs.utexas.edu!news.sprintlink.net!news.azstarnet.com!usenet
From: Wes Stewart <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Drake TR7
Date: 17 Aug 1995 03:27:14 GMT
Organization: Arizona Daily Star - AZSTARNET
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Message-ID: <40ucui$[e-mail]>
References: <40u9gs$[e-mail]>
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[e-mail] (jim pestell) wrote:
>I have a Drake tr7 and wish to put it on the new 17 and 12 meter
>bands, some one heard that it is just a simple matter of cutting out 2
>diods, any one know about this??
>
It's even simplier than that.  As I recall I did it by opening one circuit trace on the bottom
of the motherboard.  Off hand, I don't remember which one, but I'll dig out the manual (it's
in my storage room) when I get over my cold.  If you don't get another answer, email me to jog
my memory, cuz this newsreader trashes things sometimes.

73, Wes -- [e-mail]
        or [e-mail]



From [e-mail] Fri Aug 18 14:56:51 1995
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From: [e-mail] (DCG Mktg Docmnt (Ivrea))
Newsgroups: rec.radio.amateur.equipment,rec.radio.amateur.misc,rec.radio.amateur.homebrew
Subject: Drake TR7 help
Date: 17 Aug 1995 17:22:07 GMT
Organization: Olivetti ATC; Sunnyvale, CA USA
Lines: 15
Message-ID: <40vtrv$[e-mail]>
NNTP-Posting-Host: flash.atc.olivetti.com
Xref: grape.epix.net rec.radio.amateur.equipment:15977 rec.radio.amateur.misc:85100 rec.radio.amateur.homebrew:9013


I have the problem with the receiver part of the transceiver Drake TR7
serial number 6052.  The audio reproduction is not clear compared with
the other trtx connected to the same antenna and tuned to the same signal.
I don't know if it is a fault of the my rtx , or the rtx produced at a certain
period, and if successive versions have eliminated the problem, and how.
Is anybody able to help me?

Tanks in advance

My e-mail address is:   [e-mail]






From [e-mail] Fri Aug 18 14:56:52 1995
Newsgroups: rec.radio.amateur.equipment,rec.radio.amateur.misc,rec.radio.amateur.homebrew
Path: grape.epix.net!news.sprintlink.net!howland.reston.ans.net!swrinde!emory!cssun.mathcs.emory.edu!wa4mei!ke4zv!gary
From: [e-mail] (Gary Coffman)
Subject: Re: Drake TR7 help
Message-ID: <[e-mail]>
Reply-To: [e-mail] (Gary Coffman)
Organization: Destructive Testing Systems
References: <40vtrv$[e-mail]>
Date: Fri, 18 Aug 1995 14:55:11 GMT
Lines: 20
Xref: grape.epix.net rec.radio.amateur.equipment:16009 rec.radio.amateur.misc:85161 rec.radio.amateur.homebrew:9040

In article <40vtrv$[e-mail]> [e-mail] (DCG Mktg Docmnt (Ivrea)) writes:
>I have the problem with the receiver part of the transceiver Drake TR7
>serial number 6052.  The audio reproduction is not clear compared with
>the other trtx connected to the same antenna and tuned to the same signal.
>I don't know if it is a fault of the my rtx , or the rtx produced at a certain
>period, and if successive versions have eliminated the problem, and how.
>Is anybody able to help me?

What do you mean, "is not clear"? Do you mean the frequency response is
not flat across the bandwidth of the filter in use, or do you mean that
the audio is distorted, or do you mean that the signal is weak and noisy,
etc? More information please. Detail the symptoms, and the conditions under
which they appear, and we'll try to help.

Gary
--
Gary Coffman KE4ZV          |    You make it,     | gatech!wa4mei!ke4zv!gary
Destructive Testing Systems |    we break it.     | emory!kd4nc!ke4zv!gary
534 Shannon Way             |    Guaranteed!      | [e-mail]
Lawrenceville, GA 30244     |                     |


From [e-mail] Fri Aug 18 14:56:53 1995
Newsgroups: rec.radio.amateur.homebrew
Path: grape.epix.net!sc2c526a.ra.osd.mil!nova.sti.nasa.gov!lerc.nasa.gov!magnus.acs.ohio-state.edu!math.ohio-state.edu!howland.reston.ans.net!news.sprintlink.net!alfa02.medio.net!guysmiley.blarg.com!eskimo!news
From: [e-mail] (Bill Turner)
Subject: Re: EIMAC 4CX1500A Valve
X-Nntp-Posting-Host: tia1.eskimo.com
Message-ID: <[e-mail]>
Sender: [e-mail] (News User Id)
Organization: None
X-Newsreader: WinVN 0.93.14
References: <[e-mail]>
Mime-Version: 1.0
Date: Wed, 16 Aug 1995 05:08:55 GMT
Lines: 19

In article <[e-mail]>, [e-mail]
says...
>
>Hello All
>
>A friend of mine has an EIMAC 4CX1500A with only 6500 hours running life
>so far.
-snip-

>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
ONLY 6500 hours??  How long are these things supposed to last?  I'm building
a 4CX1000A amp right now (slightly different tube, but similar construction)
and I'd be quite pleased to learn that 6500 hours is not much.... is it?

73, Bill W7LZP
[e-mail]





From [e-mail] Fri Aug 18 14:56:53 1995
Path: grape.epix.net!sc2c526a.ra.osd.mil!nova.sti.nasa.gov!lerc.nasa.gov!magnus.acs.ohio-state.edu!math.ohio-state.edu!howland.reston.ans.net!newsfeed.internetmci.com!usenet.eel.ufl.edu!news.ultranet.com!zombie.ncsc.mil!news.duke.edu!usenet
From: [e-mail] (james P. Meyer)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Got patent approved - but need antenna help.
Date: Tue, 15 Aug 1995 23:32:45 GMT
Organization: Duke University, Durham, NC, USA
Lines: 29
Message-ID: <40rfik$[e-mail]>
References: <40pdeo$[e-mail]>
NNTP-Posting-Host: async55.async.duke.edu
X-Newsreader: Forte Free Agent 1.0.82

[e-mail] wrote:

> I need to transmit at 220 MHz between two fixed,
>line-of-sight points.  I can use directional antennas at both ends,
>but my transmitter can put out only
>10 mW.  What's the best general antenna design
>and how far can I expect to detect an FM signal
>that has a deviation of only 300 Hz?
>If anyone is interested in helping with this project - let me know.

        The *best* antenna would be a dish the size of a radio astronomy
telescope.  You could expect to put the transmitter on the *moon* and
still be able to hear it from the earth.

        I expect though, that that is out of the question.  There are many
variables to be considered.  Give me a personal E-mail message and
I'll try to help you sort them out.

Jim "With an FCC licence." Meyer     <[e-mail]>

P.S.  It would make reading your messages easier if you could find out
      how to make each line average out to about 70 characters in
      length.








From [e-mail] Fri Aug 18 14:56:54 1995
Path: grape.epix.net!sc2c526a.ra.osd.mil!nova.sti.nasa.gov!lerc.nasa.gov!magnus.acs.ohio-state.edu!math.ohio-state.edu!howland.reston.ans.net!tank.news.pipex.net!pipex!in2.uu.net!INbe.net!iphome11
From: [e-mail] (franky b.)
Newsgroups: rec.radio.amateur.homebrew
Subject: high-speed packet modem
Date: Thu, 17 Aug 95 16:44:08 GMT
Organization: Globe Internetworking bvba
Lines: 11
Distribution: world
Message-ID: <40vhhu$[e-mail]>
NNTP-Posting-Host: iphome11.glo.be
X-Newsreader: News Xpress Version 1.0 Beta #2.1

Hello and thanks for reading my article

I'm a belgian Ham who's looking for drawings (shematics)
of high-speed (example: G3RUH) modems for packet usage.
Or an FTP-site where I can FTP the files of the drawings.

Thanks in advance
[e-mail]
ON1BP   JO11RB




From [e-mail] Fri Aug 18 14:56:55 1995
Newsgroups: rec.radio.amateur.homebrew
Path: grape.epix.net!sc2c526a.ra.osd.mil!nova.sti.nasa.gov!lerc.nasa.gov!magnus.acs.ohio-state.edu!math.ohio-state.edu!howland.reston.ans.net!newsfeed.internetmci.com!news.uoregon.edu!news.u.washington.edu!uw-beaver!cornellcs!rochester!rit!sunsrvr6!jdc
From: [e-mail] (James D. Cronin)
Subject: Re: How to Space-Wind Coils?
Message-ID: <[e-mail]>
Sender: [e-mail] (Operator)
Organization: Northern Telecom, Network Application Systems
References: <[e-mail]>
Date: Tue, 15 Aug 1995 16:59:52 GMT
Lines: 24

In article <[e-mail]>,
WB3U <[e-mail]> wrote:
>The other day I was in a sporting goods store and noticed
>that monofilament line starts at a diameter of about 0.005" (2 lb
>test) and goes up in increments of about 0.002 or 0.003 from there.
>
>This is close to the size of many common wire gauges and I'm wondering
>if anyone has ever used fishing line to space-wind a coil?  I know the
>diameter of different brands will vary, but is it reasonably
>consistent throughout the same spool?  For my purpose, the exact
>spacing is less critical than the need for it to be consistent from
>one end of the finished coil to the other.
>
>Thanks & 73,
>
>Jack  WB3U

How about winding on the threads of a bolt or machine screw?  It works
great.  Thanks to Ten-Tec for this tip, from their 6-meter transverter
kit instructions.

73...Jim  N2VNO




From [e-mail] Fri Aug 18 14:56:55 1995
Path: grape.epix.net!sc2c526a.ra.osd.mil!nova.sti.nasa.gov!lerc.nasa.gov!magnus.acs.ohio-state.edu!math.ohio-state.edu!howland.reston.ans.net!europa.chnt.gtegsc.com!usenet.eel.ufl.edu!news.gmi.edu!msunews!localhost!root
From: [e-mail] (Phil Storm)
Newsgroups: rec.radio.amateur.homebrew
Subject: Inductor coil
Date: 16 Aug 1995 04:48:13 GMT
Organization: Interdictor
Lines: 11
Message-ID: <40rtad$[e-mail]>
NNTP-Posting-Host: via-annex2-16.cl.msu.edu
X-Newsreader: TIN [version 1.2 PL2]


        Hey...I'm building this Radio and I chipped about 20% off of the
inductor coil that screws into this metal silver box. The RF signal quality
is pretty bad, and I'm associating it with the chipped coil. I've reordered
a new one, but it seems odd to me that it still works with the chipped coil.
should there be much improvement with the whole coil intact? I don't really
know much about how this thing works (all I know is that it tunes the freq.)
and I don't know what quality signal to expect.  If someone could explain
this inductor coil for me...
thanks



From [e-mail] Fri Aug 18 14:56:56 1995
Path: grape.epix.net!news.sprintlink.net!cs.utexas.edu!swrinde!ihnp4.ucsd.edu!news1.ucsd.edu!news-mail-gateway
From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: Longwave Transmitter
Date: 17 Aug 95 19:59:10 GMT
Organization: ucsd usenet gateway
Lines: 33
Message-ID: <[e-mail]>
NNTP-Posting-Host: ucsd.edu
Originator: [e-mail]

Having operated a "LowFER" station for several years, I might make a comment or
two on 'interpretations' of the part 15 rules.

The rules actually limit the antenna length to 50 feet ( I can't recall if
it's given in feet, or as a metric length, but that's close enough...)

The was this is interpreted by most LowFERs is a 35 foot mast, with a 15 foot
radius tophat, or something along those lines.

With the "typical good" Lowfer transmitter station, the radiated power (with
1 watt "input to the PA" (which can translate to about 960 milliwatts or so
with a WB7CAK-type transmitter...) will likely be in the 1 milliwatt region,
although 'CAK *did* acheive an efficiency of approximately 1% - but after doing things like having a heavier-guage Litz-wire lo
ading coil, auto-antenna tuner, etc.)

Officially, the FCC "frowns" on using amateur calls on non-amateur frequencies, but I don't think that it is necessarily illega
l.  Use of them in leiu of the
appropriate call for that frequency/service would be illegal, of course.  Many LowFERs use some portion of their ham call as th
eir LowFER call (i.e. 9HDQ, or
8LXJ) such that one could logically determine the operator.

As for receiving LowFER stations, I have just used my Drake TR-7 along with
both an Active whip, and a loaded random-wire (an HF-antenna with a TV-horizontal
oscillator coil in series, tuned for resonance) and from a previous QTH
(Flagstaff, AZ) I have heard a number of California LowFERs, as well as 9HDQ
and 8LXJ in Indiana and Ohio, respectively.  I could reliably hear the better-
equipped California LowFERs almost any night the static wasn't too terrible...

<Clint>

[e-mail]
[e-mail]



From [e-mail] Fri Aug 18 14:56:57 1995
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From: [e-mail] (Elendir)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Modulating VCO's
Date: 16 Aug 1995 20:23:28 GMT
Organization: ENST - Telecom Paris
Lines: 10
Message-ID: <40tk40$[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: julia.enst.fr
X-Newsreader: TIN [version 1.2 PL2]

Well -
I may be horribly wrong on this, but why not use an Armstrong FM modulator ?
I have a very fuzzy remembering of this type of modulator, but I faintly
remember that it involves a phase shifter and no PLL, other than the one
needed to generate the unmodulated carrier.
With this scheme, you avoid completly the lock up time.

Without any type of warranty !

Vincent, f5rcs


From [e-mail] Fri Aug 18 14:56:58 1995
Path: grape.epix.net!sc2c526a.ra.osd.mil!nova.sti.nasa.gov!lerc.nasa.gov!magnus.acs.ohio-state.edu!math.ohio-state.edu!howland.reston.ans.net!news.sprintlink.net!in1.uu.net!news1.digital.com!nntp-hub2.barrnet.net!venus.sun.com!male.EBay.Sun.COM!newsworthy.West.Sun.COM!abyss.West.Sun.COM!myers
From: [e-mail] (Dana Myers)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Modulating VCO's
Date: 16 Aug 1995 22:05:47 GMT
Organization: SunSoft South, Los Angeles, CA
Lines: 23
Message-ID: <40tq3r$[e-mail]>
References: <[e-mail]> <40tk40$[e-mail]>
NNTP-Posting-Host: sunspot.west.sun.com

In article <40tk40$[e-mail]>, Elendir <[e-mail]> wrote:
>Well -
>I may be horribly wrong on this, but why not use an Armstrong FM modulator ?
>I have a very fuzzy remembering of this type of modulator, but I faintly
>remember that it involves a phase shifter and no PLL, other than the one
>needed to generate the unmodulated carrier.
>With this scheme, you avoid completly the lock up time.
>
>Without any type of warranty !
>
>Vincent, f5rcs

Any kind of phase modulation (versus frequency modulation) is
going to have inherent pre-emphasis and very poor low frequency
response.  For sending baseband data (such as 9600 baud GMSK),
these are both disadvantages.  For sending voice or audio
modulated data (such as 1200 baud Bell 202), this is fine.


--
 * Dana H. Myers KK6JQ, DoD#: j | Views expressed here are      *
 * [phone]               | mine and do not necessarily   *
 * [e-mail]      | reflect those of my employer  *


From [e-mail] Fri Aug 18 14:56:58 1995
From: [e-mail] (Bob Liesenfeld)
Path: grape.epix.net!sc2c526a.ra.osd.mil!nova.sti.nasa.gov!lerc.nasa.gov!magnus.acs.ohio-state.edu!math.ohio-state.edu!cs.utexas.edu!news.sprintlink.net!in1.uu.net!rosevax!hamlink!fredmail
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Pcb & iron-on transfer
Message-ID: <[e-mail]>
Date: Thu, 17 Aug 1995 00:09:35 -0100
X-FTN-To: [e-mail].
Lines: 32

AA>From: [e-mail] (Paul Egan)
AA>Newsgroups: rec.radio.amateur.homebrew
AA>Subject: PCB & Iron-on transfer?
AA>Organization: Toronto Free-Net Inc., Toronto, Ontario, Canada
AA>Reply-To: [e-mail] (Paul Egan)
AA>Message-ID: <[e-mail]>
AA>Date: Thu, 10 Aug 1995 15:10:53 GMT
AA>
AA>
AA>I have heard about this method but can't find the product.
AA>I believe that the material is run through a photocopier
AA>and then ironed to a copper clad board. Sounds like a quick
AA>way of getting to the etching stage, without having to use
AA>photo-sensitized boards and developer.
AA>Any help would be appreciated.
AA>Thanks.
AA>Paul VE3GFY
AA>
AA>
AA>---
AA> * Origin: HamLink RBBS - 612/HAM-0000 v.34 St. Paul, MN
AA>(1:282/100.0)Hi Paul,
 For what its worth I have tryed this product and was very disapointed.
Lots of trouble with traces comming up. Maybe I did something wrong, but
don't think so. It is available from Digi-Key in Thief River Falls MN.
I can get you the address if you need it.
 Good luck.
72  Bob   WB0POQ

   Technology is OUT of control.....




From [e-mail] Fri Aug 18 14:56:59 1995
Newsgroups: rec.radio.amateur.homebrew
Path: grape.epix.net!news.sprintlink.net!in1.uu.net!gatech!wa4mei!ke4zv!gary
From: [e-mail] (Gary Coffman)
Subject: Re: Pcb & iron-on transfer
Message-ID: <[e-mail]>
Reply-To: [e-mail] (Gary Coffman)
Organization: Destructive Testing Systems
References: <[e-mail]>
Date: Thu, 17 Aug 1995 16:37:14 GMT
Lines: 16

In article <[e-mail]> [e-mail] (Bob Liesenfeld) writes:
> For what its worth I have tryed this product and was very disapointed.
>Lots of trouble with traces comming up. Maybe I did something wrong, but
>don't think so. It is available from Digi-Key in Thief River Falls MN.
>I can get you the address if you need it.

The copper has to be *clean*, I mean *really* clean, and the iron
has to be at the right temperature (cotton high, and use a cover
cloth and a lot of pressure).

Gary
--
Gary Coffman KE4ZV          |    You make it,     | gatech!wa4mei!ke4zv!gary
Destructive Testing Systems |    we break it.     | emory!kd4nc!ke4zv!gary
534 Shannon Way             |    Guaranteed!      | [e-mail]
Lawrenceville, GA 30244     |                     |


From [e-mail] Fri Aug 18 14:57:00 1995
Path: grape.epix.net!mango.epix.net!gmfoster
From: Garry Foster <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Pcb & iron-on transfer
Date: Thu, 17 Aug 1995 16:56:07 -0400
Organization: epix.net
Lines: 12
Message-ID: <[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: mango.epix.net
Mime-Version: 1.0
Content-Type: TEXT/PLAIN; charset=US-ASCII
X-Sender: [e-mail]
In-Reply-To: <[e-mail]>

There is a very complete article on this in this months issue of "Nuts
and Volts". The author is sold on it but has went to some expense in
setting up. There have been some good discussions on this is
sci.electronics over the past few months. Many swear by it and some swear
at it. I have no experance but from what I have read would give it a try
if I had a laser printer.

                                                Garry

PS
I've found many reluctent to allow anyon eto stick strange stuff in thier
printers/copiers.


From [e-mail] Fri Aug 18 14:57:01 1995
Newsgroups: rec.radio.amateur.homebrew
Path: grape.epix.net!news.sprintlink.net!in1.uu.net!psinntp!psinntp!psinntp!psinntp!sunsrvr6!jdc
From: [e-mail] (James D. Cronin)
Subject: Re: PCB & Iron-on transfer?
Message-ID: <[e-mail]>
Sender: [e-mail] (Operator)
Organization: Northern Telecom, Network Application Systems
References: <[e-mail]> <40dj8e$[e-mail]> <[e-mail]>
Date: Thu, 17 Aug 1995 15:43:59 GMT
Lines: 22

In article <[e-mail]>,
Jay Wicklund  <[e-mail]> wrote:
>
>I haven't had much luck with it either.  I seem to end up with
>uneven density of toner on the traces and other copper areas.  I've
>tried it both with my HP laserjet, and with a standard office
>copier.  The other problem that I had  was patches (both small and
>large) that didn't attach to the copper clad when I transferred the
>pattern.  I sure would like to see an easy way to get the resist
>pattern onto the board.
>
>Jay (KI7RH)

We got a laser printer for home use a year or two ago.  I got "demo"
pages from several brands at the local computer stores, took them home,
and tried ironing them to a PC board.

There was a wide variation in how well the toner sticks.  The cheaper
Brother laserprinter was best.

73...Jim  N2VNO



From [e-mail] Fri Aug 18 14:57:01 1995
Path: grape.epix.net!news.sprintlink.net!in1.uu.net!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail
From: [e-mail] (BCdlr)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Phone Line Status Indicat
Date: 17 Aug 1995 17:18:36 -0400
Organization: America Online, Inc. (1-800-827-6364)
Lines: 6
Sender: [e-mail]
Message-ID: <410bnc$[e-mail]>
References: <[e-mail]>
Reply-To: [e-mail] (BCdlr)
NNTP-Posting-Host: newsbf02.mail.aol.com

I have a several schematics laying around to do this.  If you want one,
email me, and we can talk about which one you would like.  Just bought
several volumes of the encyclopedia of electronic circuits, by Graf.
There are several in there.....
Dan Reynolds, [e-mail], KB9JLO
Dan Reynolds, [e-mail], KB9JLO


From [e-mail] Fri Aug 18 14:57:02 1995
Path: grape.epix.net!news.sprintlink.net!newsfeed.internetmci.com!solaris.cc.vt.edu!homer.alpha.net!earth.execpc.com!not-for-mail
From: [e-mail] (Terry Hubbard)
Newsgroups: rec.radio.amateur.homebrew
Subject: Pin Diodes
Date: 16 Aug 1995 12:23:39 -0500
Organization: Exec-PC
Lines: 3
Distribution: usa
Message-ID: <40t9ir$[e-mail]>
NNTP-Posting-Host: earth.execpc.com

Is it possible to distinguish a pin diode from any other switching type diode
found on a hf receiver board? Any ifno appreciated.



From [e-mail] Fri Aug 18 14:57:02 1995
Path: grape.epix.net!sc2c526a.ra.osd.mil!nova.sti.nasa.gov!lerc.nasa.gov!news.larc.nasa.gov!news.msfc.nasa.gov!europa.chnt.gtegsc.com!usenet.eel.ufl.edu!col.hp.com!news.dtc.hp.com!hpscit.sc.hp.com!rkarlqu
From: [e-mail] (Richard Karlquist)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Pin Diodes
Date: 16 Aug 1995 20:04:40 GMT
Organization: Hewlett-Packard
Lines: 16
Distribution: usa
Message-ID: <40tj0o$[e-mail]>
References: <40t9ir$[e-mail]>
NNTP-Posting-Host: hpscrj.scd.hp.com

In article <40t9ir$[e-mail]>,
Terry Hubbard <[e-mail]> wrote:
>Is it possible to distinguish a pin diode from any other switching type diode
>found on a hf receiver board? Any ifno appreciated.


You can unsolder it and connect it to a signal generator and excite
it at 10 MHz.  A regular diode (assuming it's not a power rectifier
type) should have little trouble recovering in the 50 nSec. available.
A PIN diode will have a very long recovery time and be unable to
rectify the 10 MHz.  Compare to a known reference like a 1N4148
switching diode.

Rick Karlquist N6RK
[e-mail]



From [e-mail] Fri Aug 18 14:57:03 1995
Path: grape.epix.net!mango.epix.net!gmfoster
From: Garry Foster <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Pin Diodes
Date: Thu, 17 Aug 1995 16:48:54 -0400
Organization: epix.net
Lines: 31
Message-ID: <[e-mail]>
References: <40t9ir$[e-mail]> <40tj0o$[e-mail]>
NNTP-Posting-Host: mango.epix.net
Mime-Version: 1.0
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On 16 Aug 1995, Richard Karlquist wrote:

:> In article <40t9ir$[e-mail]>,
:> Terry Hubbard <[e-mail]> wrote:
:> >Is it possible to distinguish a pin diode from any other switching
:type diode > >found on a hf receiver board? Any ifno appreciated.
:>
:>
:> You can unsolder it and connect it to a signal generator and excite
:> it at 10 MHz.  A regular diode (assuming it's not a power rectifier
:> type) should have little trouble recovering in the 50 nSec. available.
:> A PIN diode will have a very long recovery time and be unable to
:> rectify the 10 MHz.  Compare to a known reference like a 1N4148
:> switching diode.
:>
:> Rick Karlquist N6RK
:> [e-mail]
">
:>
:>


Could you post a little more information on this. Do we need to load it
with a resistor? Can we just hook it up to a multimeter and see if the RF
is detected and varries as we move the signal gen level up and down? It
sounds too easy....We all want to make it diffucult.

                                                Garry
                                                wb0nno


From [e-mail] Fri Aug 18 14:57:04 1995
Newsgroups: rec.radio.amateur.homebrew
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From: "Al Koblinski  (W7XA)" <[e-mail]>
Subject: Re: Pin Diodes
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Really, you can only tell by part number.  It is unlikely that any but
the most recent receivers would have PIN diodes.  They are a bit more
expensive.




From [e-mail] Fri Aug 18 14:57:04 1995
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From: Grant Youngman <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Pin Diodes
Date: 17 Aug 1995 21:12:23 GMT
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[e-mail] (Terry Hubbard) wrote:
>Is it possible to distinguish a pin diode from any other switching type diode
>found on a hf receiver board? Any ifno appreciated.
>

Not visually, I'm afraid.  Check the schematic and match part nos.

Grant/NQ5T



From [e-mail] Fri Aug 18 14:57:05 1995
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From: [e-mail] (Yauwah Benjamin Sam)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Pin Diodes
Date: 17 Aug 1995 22:33:32 GMT
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In article <40t9ir$[e-mail]>, [e-mail] (Terry Hubbard) writes:
|> Is it possible to distinguish a pin diode from any other switching type diode
|> found on a hf receiver board? Any ifno appreciated.
|

My experience was PIN diodes have about 1 volt forward drop, while regular
silicon signal diodes have 0.6 volt, while Germanium and Schottky Diodes
have about 0.3 volt.


Regards,

Benjamin Sam
KC7FGP
>


From [e-mail] Fri Aug 18 14:57:06 1995
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From: [e-mail] (wayne wicks)
Newsgroups: rec.radio.amateur.homebrew
Subject: RCA BT-1
Date: Fri, 18 Aug 1995 05:24:04 GMT
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I am looking for some of the great RCA engineers or folks who used to
work on the old BT-1 AM transmitters.  I specifically am looking for a
source of the inductor clips that were used on the inductors.  They
sort of slipped in and locked onto the inductor that was about 3/8".
I build verticles and have a number of the inductors and am trying to
locate those magic clips.

Wayne  /  wa2kec
[e-mail]



From [e-mail] Fri Aug 18 14:57:06 1995
Newsgroups: rec.radio.amateur.homebrew
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From: [e-mail] (Andrew T. Webb Esq.)
Subject: Request for info on Toko S18 coils. URGENT
Sender: [e-mail] (USENET News System)
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 am looking for infomation on the following Tomo S18 coils:-
Ferrite cored white
ferite cored Violet
ferrite cored yellow

air cored orange
air cored yellow
air cored blue

Mainly I need the inductances for these coils, and the name of a
supplier in Europe to get them from.

Also I am looking for the formulae relating the inductance of a coil  to
the wire diameter, the coil diameter and the number of turns.

Thanks in advance.

Andrew Webb,

[e-mail]


From [e-mail] Fri Aug 18 14:57:07 1995
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From: Leon Heller <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Request for info on Toko S18 coils. URGENT
Date: Wed, 16 Aug 95 19:52:41 GMT
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In article <[e-mail]> [e-mail] "Andrew T. Webb Esq." writes:

>  am looking for infomation on the following Tomo S18 coils:-
> Ferrite cored white
> ferite cored Violet
> ferrite cored yellow
>
> air cored orange
> air cored yellow
> air cored blue
>
> Mainly I need the inductances for these coils, and the name of a
> supplier in Europe to get them from.
>
> Also I am looking for the formulae relating the inductance of a coil  to
> the wire diameter, the coil diameter and the number of turns.

Go to your local branch of WH Smith and buy a copy of the Cirkit catalogue.
Cirkit stock most of the Toko range, and you'll find the S18 parts in
the catalogue. If you have problems, phone Cirkit on [phone].

Leon
--
Leon Heller, G1HSM                | "Do not adjust your mind, there is
E-mail [e-mail]  |  a fault in reality": on a wall
Phone: [phone]         |  many years ago in Oxford.


From [e-mail] Fri Aug 18 14:57:08 1995
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From: [e-mail] (Phil Storm)
Newsgroups: rec.radio.amateur.homebrew
Subject: RF amplifier
Date: 16 Aug 1995 04:54:59 GMT
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        Does anyone know how to make a cheap RF amplifier? I got this schem
out of radio shack, but haven't tried it yet. It says it will increase the
signal by 2x.
        its:

                |
                | 9v battery +
                =
                =  1k resistor
                |--------------------------> signal + out
            -----
    1uf cap| D
 ------|---|      2N3819 transistor.
 + in      | S
           ------
-----------------|--------------------------> signal - out
 - in           9v battery -

        Sorry for the crappy schematic, but will this work?



From [e-mail] Fri Aug 18 14:57:09 1995
Newsgroups: rec.radio.amateur.homebrew
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From: "Al Koblinski  (W7XA)" <[e-mail]>
Subject: Re: RF amplifier
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Not likethat it won't.  you will need a resistor from gate to ground,
maybe a few hundred k ohm and a parallel capacitor/resistor from the
source to ground (or - battery) of a few k ohm and few thousand
picofarad.
You would be better to use one of the little broadband amps from
Mini-Circuits that sells for a few bucks unless you are somewhat
familiar with FET designs.
Regards, Al




From [e-mail] Fri Aug 18 14:57:10 1995
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From: [e-mail] (Robert Tetrault)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: RF amplifier
Date: Wed, 16 Aug 1995 22:48:40 -0700
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In article <40rtn3$[e-mail]>, [e-mail] (Phil
Storm) wrote:

>         Does anyone know how to make a cheap RF amplifier? I got this schem
> out of radio shack, but haven't tried it yet. It says it will increase the
> signal by 2x.
>         its:
>
>                 |
>                 | 9v battery +
>                 =
>                 =  1k resistor
>                 |--------------------------> signal + out
>             -----
>     1uf cap| D
>  ------|---|      2N3819 transistor.
>  + in      | S
>            ------
> -----------------|--------------------------> signal - out
>  - in           9v battery -
>
>         Sorry for the crappy schematic, but will this work?



It will work even better if you replace the 1k resistor with an
inductor/capacitor tuned to the frequency of interest, or just an inductor
if you can't find one of those cute little variable caps that look like
jelly beans.  Depending on your frequency of interest, you might start at
an inductor value with a reactance of 1kOhms at that frequency.  For
example, at 10 MHz, the required inductor value would be about 20
microHenries.  The C to resonate at that frequency would be about 20
picoFarads.  IF you stay at 1k Ohms, you can scale to other frequencies.

You will also need to run a high value resistor to 9V minus from the gate
of the FET for it to work; about 100K or more Ohms (very uncritical).

Furthermore, the 9V minus supply is not strictly necessary if you make
that ground instead of minus.  The extra 9V gives you more range for large
input voltages without distortion, but is unnecessary if you are only
interested in milliVolts or less.


From [e-mail] Fri Aug 18 14:57:10 1995
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From: [e-mail] (Brad Mitchel)
Newsgroups: rec.radio.amateur.homebrew
Subject: RF TRANSISTORS??
Date: 17 Aug 1995 17:08:36 GMT
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Where can I get RF transistors besides RF Parts. They seem a little pricy?
73

---
 -----------------
|  ___  ________  |    Bradley S. Mitchell Senior Project Development Engineer
| |  / /        | |    Eastman Kodak Company
| | / /         | |    KEMD Electronic Products
| |< < K O D A K| |    Circuit Board Assembly Dept. 606 Test Engineering
| | \ \         | |    901 Elmgrove Road Rochester, N.Y. 14653-5211
| |__\ \________| |    [phone], FAX [phone]
|                 |    INTERNET:   [e-mail]
 -----------------     Amateur Radio Callsign WB8YGG




From [e-mail] Fri Aug 18 14:57:11 1995
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From: Matt Reilly <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Schematic Draw Program Recommendations?
Date: 17 Aug 1995 02:09:16 GMT
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[e-mail] (WB3U) wrote:
>
>I've been using an illustrator program program to draw occasional
>schematics.  It's extremely tedious and time consuming.
>
>Can you tell me where I can find the free software you mentioned?

I looked in the comp.lsi.cad faq (on the web and at rtfm.mit.edu)
and found

url:  ftp://wuarchive.wustl.edu/systems/ibmpc/simtel/cad/pads*.zip

the archive was busy when I checked, but a LYCOS search for PADS and PCB
together should yield a hit or two...

                                        matt (kb1vc)



From [e-mail] Fri Aug 18 14:57:11 1995
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From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: terminal node controler
Date: Wed, 16 Aug 95 20:34:12 -0500
Organization: Delphi ([e-mail] email, 800-695-4005 voice)
Lines: 2
Message-ID: <[e-mail]>
NNTP-Posting-Host: bos1e.delphi.com

if anyone could give the plans to build a terminal node controller that work useing a baycomsin
using the baycom soft ware if possable the circuit using the am7910 chip     thanx


From [e-mail] Fri Aug 18 14:57:12 1995
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From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: TNC plans needed
Date: Wed, 16 Aug 95 21:57:25 -0500
Organization: Delphi ([e-mail] email, 800-695-4005 voice)
Lines: 6
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NNTP-Posting-Host: bos1b.delphi.com

if there is someone that has plans to build a tnc or some kind
of a modem that would work with the baycom software please send
it to me.

        [e-mail]
                  thanx


From [e-mail] Fri Aug 18 14:57:23 1995
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From: [e-mail] ()
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: TNC plans needed
Date: 17 Aug 1995 14:29:53 GMT
Organization: Comp.Center (RUS), U of Stuttgart, FRG
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In article <[e-mail]>,  <[e-mail]> wrote:
>if there is someone that has plans to build a tnc or some kind
>of a modem that would work with the baycom software please send
>it to me.
>
>        [e-mail]
>                  thanx

From [e-mail] Thu Apr 13 09:05:53 MST 1995
Article: 8818 of rec.radio.amateur.digital.misc
Newsgroups: rec.radio.amateur.digital.misc
From: [e-mail] (Barbara Fehner)
Subject: Re: Looking for baycom SCHEMA - btnc.gif (1/1)
Reply-To: [e-mail]
Organization: CTS Network Services (CTSNET), San Diego, CA
Date: Tue, 11 Apr 1995 22:37:53 GMT
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5]AWG<U[G=Y[G>][G?Q[HL3D"```[
`
end




From [e-mail] Fri Aug 18 14:57:24 1995
Path: grape.epix.net!sc2c526a.ra.osd.mil!nova.sti.nasa.gov!lerc.nasa.gov!magnus.acs.ohio-state.edu!math.ohio-state.edu!howland.reston.ans.net!tank.news.pipex.net!pipex!in2.uu.net!news.compuserve.com!news.production.compuserve.com!news
From: Old Man <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew,rec.radio.swap
Subject: TRADE: ICOM IC-r1 receiver
Date: 17 Aug 1995 03:51:15 GMT
Organization: CompuServe, Inc. (1-800-689-0736)
Lines: 6
Message-ID: <40uebj$vq$[e-mail]>
Xref: grape.epix.net rec.radio.amateur.homebrew:9001 rec.radio.swap:41640

Trade?
ICOM IC-R1 receiver, with Hi-capacity NiCad battery, fast charge adapter for internal battery,
ICOM drop-in charger, service manual..all excellent.  This is the unblocked model.
Will consider trade for BRAND new unused SONY SW-100S receiver (Model with hard carrying
case, active antenna, power supply accessories) Shipping/insurance prepaid.
Sandy Blaize Internet: [e-mail]


From [e-mail] Fri Aug 18 14:57:24 1995
Path: grape.epix.net!news.sprintlink.net!europa.chnt.gtegsc.com!uhog.mit.edu!bloom-beacon.mit.edu!news.moneng.mei.com!uwm.edu!bfs.uwm.edu!pff
From: [e-mail] (Paul Fischer)
Newsgroups: rec.radio.amateur.homebrew
Subject: Trouble with MRF141G - 300 watt amp
Date: Thu, 17 Aug 1995 08:37:03 UNDEFINED
Organization: Business & Financial Services
Lines: 18
Message-ID: <[e-mail]>
NNTP-Posting-Host: 129.89.26.237
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I am having trouble with an amplifier I have built per motorola application
note AR313. The trouble is the MOSFET conducts (drain to source) when no gate
voltage is applied. This is not supposed to happen. This happens regardless of
the configuration the gate is in. By this I mean the gate is not supposed to
float or be left open at any time. I ground the gate and the devive still
conducts! I have checked and rechecked the circuit and all components two
dozen times. I have compleletly disassembled the amp and put it back together
a piece at a time testing the circuit at each step of the process. It still
conducts. The device is not completely turned on as it draws about 700ma.
Several other strange things are occuring. When I turn the power off my amp
meter still shows the device drawing about 5ma? Stranger yet is that this 5ma
draw seems to change with respect to the amount of sunlight hitting the
device? When shaded the current draw drops to around 2ma. This is a very
simple design and should be easy to build. I have had nothing but trouble. The
only thing I can think of is that I am going about testing and setting the
idle current all wrong. Does the device need to have input and output loading
on it when setting idle current? Or in any testing? Any help would be greatly
appreciated.


From [e-mail] Fri Aug 18 14:57:25 1995
Path: grape.epix.net!sc2c526a.ra.osd.mil!nova.sti.nasa.gov!lerc.nasa.gov!magnus.acs.ohio-state.edu!math.ohio-state.edu!cs.utexas.edu!news.sprintlink.net!in2.uu.net!newsflash.concordia.ca!nstn.ns.ca!coranto.ucs.mun.ca!noah!dbeach
From: [e-mail] (David Beach, NorFam, Memorial University)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: VHF Coaxial Collinear Plans Wanted
Date: 16 Aug 95 09:01:02 -0330 NST
Organization: Memorial University. St.John's Nfld, Canada
Lines: 27
Message-ID: <1995Aug16.090102.1@noah>
References: <1995Aug10.111431.1@noah> <40ijsh$[e-mail]>
NNTP-Posting-Host: noah.ucs.mun.ca


>>I need some construction advice on coaxial collinear VHF antennas (you
>>know, built out of RG/8 or similar).
>
> The reason they are now mute is the early articles (in QST and the
> Handbooks) were non-functioning antennas.
>
> Why not build a skirt collinear or a phased stacked dipole array?
>
> 73 Tom
>
The reason I am interested in the coax version is I have a surplus
150Mhz whip
 that I think is a coax collinear inside (I x-rayed it!)
Before I start hacking it apart to get is to work on 146 Mhz
I thought I would try to get some info on the theory.
I could, of course, just hammer-and-tongs the project by starting
at it with a saw but...

Anyway, that's why I wasn't considering some of the other types
of antennas as they would not fit inside the hollow mast.

I have a very noisy line today - sorry if there are garbage
characters!!

David Beach VO2BD



From [e-mail] Fri Aug 18 14:57:26 1995
Path: grape.epix.net!sc2c526a.ra.osd.mil!nova.sti.nasa.gov!lerc.nasa.gov!magnus.acs.ohio-state.edu!math.ohio-state.edu!uwm.edu!cs.utexas.edu!howland.reston.ans.net!ix.netcom.com!netnews
From: [e-mail] (Einstein )
Newsgroups: rec.radio.amateur.homebrew
Subject: Where can I find plans for a spark gap transmitter?
Date: 17 Aug 1995 19:36:48 GMT
Organization: Netcom
Lines: 9
Message-ID: <4105og$[e-mail]>
NNTP-Posting-Host: ix-eug-or2-06.ix.netcom.com

I looking for old plans for a spark gap transmitter.  If you have any
I'd be happy to pay for copying them.

PLEASE no flames!  I know that they are illegal to use.  This is for a
science project and will not be used on amateur or commerical bands.

George N7BUI




From [e-mail] Fri Aug 18 14:57:27 1995
Newsgroups: rec.radio.amateur.homebrew
Path: grape.epix.net!news.sprintlink.net!howland.reston.ans.net!ix.netcom.com!netcom.com!n1ist
From: [e-mail] (Michael L. Ardai)
Subject: Re: Where can I find plans for a spark gap transmitter?
Message-ID: <[e-mail]>
Organization: Utopia Planetia Shipyards - Mars
References: <4105og$[e-mail]>
Date: Thu, 17 Aug 1995 20:38:39 GMT
Lines: 16
Sender: [e-mail]

In article <4105og$[e-mail]> [e-mail] (Einstein ) writes:
-I looking for old plans for a spark gap transmitter.
-PLEASE no flames!  I know that they are illegal to use.  This is for a
-science project and will not be used on amateur or commerical bands.

?! It sure will be on the amateur and commercial bands, all at once!
We had someone demoing a spark-gap transmitter at the Hoss Traders flea
a few years back.  Ruined quite a few sales before they announced it on
the PA.  All HF rigs were braaping the same CW message, no matter where
they were tuned :-)

/mike
--
\|/     Michael L. Ardai     N1IST             Teradyne ATB, Boston MA
-*- -------------------------------------------------------------------------
/|\     [e-mail]          [e-mail]


From [e-mail] Fri Aug 18 14:57:27 1995
Path: grape.epix.net!usenet
From: Garry Foster <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Where can I find plans for a spark gap transmitter?
Date: 17 Aug 1995 21:47:16 GMT
Organization: epix.net
Lines: 13
Message-ID: <410dd4$[e-mail]>
References: <4105og$[e-mail]>
NNTP-Posting-Host: mango.epix.net
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 1.2b4 (Windows; I; 16bit)

[e-mail] (Einstein ) wrote:
:I looking for old plans for a spark gap transmitter.  If you have any
:I'd be happy to pay for copying them.
:
:PLEASE no flames!  I know that they are illegal to use.  This is for a
:science project and will not be used on amateur or commerical bands.
:
:>George N7BUI
:
Just exactly what bands are left?<G> Military/ avation/
And isn't one reason they are illegal is that they cover a large piece of
spectrum..



From [e-mail] Fri Aug 18 14:57:28 1995
Path: grape.epix.net!news.sprintlink.net!news.azstarnet.com!usenet
From: Wes Stewart <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Where can I find plans for a spark gap transmitter?
Date: 17 Aug 1995 22:05:37 GMT
Organization: Arizona Daily Star - AZSTARNET
Lines: 18
Message-ID: <410efh$[e-mail]>
References: <4105og$[e-mail]>
NNTP-Posting-Host: sprite43.azstarnet.com
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 1.2b2 (Windows; I; 16bit)

[e-mail] (Einstein ) wrote:
>I looking for old plans for a spark gap transmitter.  If you have any
>I'd be happy to pay for copying them.
>
>PLEASE no flames!  I know that they are illegal to use.  This is for a
>science project and will not be used on amateur or commerical bands.
>
>George N7BUI
>
If you are aware of the illegality of their use, why do you still want to build one.
These were outlawed many years ago for good reason. The reasons are even "gooder" today.

Please consider the unintended consquences of using one of these and find another project.

Maybe you could explain "your" theory. <g>

Sincerely, Wes -- N7WS



From [e-mail] Fri Aug 18 14:57:28 1995
Newsgroups: rec.radio.amateur.homebrew
Path: grape.epix.net!sc2c526a.ra.osd.mil!nova.sti.nasa.gov!lerc.nasa.gov!news.larc.nasa.gov!news.msfc.nasa.gov!pendragon.jsc.nasa.gov!ames!news.hawaii.edu!news
From: [e-mail]
Subject: Re: Where can I find plans for a spark gap transmitter?
X-Nntp-Posting-Host: math.hawaii.edu
Message-ID: <[e-mail]>
Sender: [e-mail]
Organization: University of Hawaii
References: <4105og$[e-mail]> <410dd4$[e-mail]>
Date: Thu, 17 Aug 1995 19:58:25 GMT
Lines: 23

Garry Foster <[e-mail]> writes:
>[e-mail] (Einstein ) wrote:

>:I looking for old plans for a spark gap transmitter.  If you have any
>:I'd be happy to pay for copying them.
>:PLEASE no flames!  I know that they are illegal to use.  This is for a
>:science project and will not be used on amateur or commerical bands.
>:>George N7BUI

>Just exactly what bands are left?<G> Military/ avation/
>And isn't one reason they are illegal is that they cover a large piece of
>spectrum..

If it's a low wattage unit and not connected to an antenna then it's
not illegal to operate. Various vintage radio groups will fire up
their sparkers occassionally to make recordings to send to members and
such. The California Wireless Society made such tapes `off-the-air'.

George: The best place to start would be to check a college library.
Here at UH we have a wealth of info about the history of radio,
with many books written by the famous pioneers themselves.

Jeff NH6IL


From [e-mail] Fri Aug 18 14:57:29 1995
Path: grape.epix.net!sc2c526a.ra.osd.mil!nova.sti.nasa.gov!lerc.nasa.gov!magnus.acs.ohio-state.edu!math.ohio-state.edu!howland.reston.ans.net!nntp.crl.com!pacbell.com!nntp-hub2.barrnet.net!venus.sun.com!male.EBay.Sun.COM!newsworthy.West.Sun.COM!abyss.West.Sun.COM!myers
From: [e-mail] (Dana Myers)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Where can I find plans for a spark gap transmitter?
Date: 18 Aug 1995 01:11:00 GMT
Organization: SunSoft South, Los Angeles, CA
Lines: 31
Message-ID: <410pb4$[e-mail]>
References: <4105og$[e-mail]> <410dd4$[e-mail]> <[e-mail]>
NNTP-Posting-Host: sunspot.west.sun.com

In article <[e-mail]>,  <[e-mail]> wrote:
>Garry Foster <[e-mail]> writes:
>>[e-mail] (Einstein ) wrote:
>
>>:I looking for old plans for a spark gap transmitter.  If you have any
>>:I'd be happy to pay for copying them.
>>:PLEASE no flames!  I know that they are illegal to use.  This is for a
>>:science project and will not be used on amateur or commerical bands.
>>:>George N7BUI
>
>>Just exactly what bands are left?<G> Military/ avation/
>>And isn't one reason they are illegal is that they cover a large piece of
>>spectrum..
>
>If it's a low wattage unit and not connected to an antenna then it's
>not illegal to operate. Various vintage radio groups will fire up
>their sparkers occassionally to make recordings to send to members and
>such. The California Wireless Society made such tapes `off-the-air'.

Umm, Jeff, maybe you ought to have a look at 47 CFR Part 15 regarding
permissible levels of unintended radiation before you make a
blanket declaration of the legality of operating a spark gap
transmitter.  I'd guess all but the wimpiest SG transmitter
violates some of the limits.

Of course, you can operate anything you want in a Faraday cage...

--
 * Dana H. Myers KK6JQ, DoD#: j | Views expressed here are      *
 * [phone]               | mine and do not necessarily   *
 * [e-mail]      | reflect those of my employer  *


From [e-mail] Fri Aug 18 14:57:30 1995
Path: grape.epix.net!sc2c526a.ra.osd.mil!nova.sti.nasa.gov!lerc.nasa.gov!magnus.acs.ohio-state.edu!math.ohio-state.edu!howland.reston.ans.net!news.sprintlink.net!in2.uu.net!newshost.marcam.com!zip.eecs.umich.edu!caen!ranecurl
From: [e-mail] (Rane Curl)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Where can I find plans for a spark gap transmitter?
Date: 18 Aug 1995 02:12:51 GMT
Organization: University of Michigan Engineering, Ann Arbor
Lines: 30
Sender: [e-mail]
Message-ID: <410sv3$[e-mail]>
References: <4105og$[e-mail]> <410dd4$[e-mail]> <[e-mail]>
NNTP-Posting-Host: [e-mail]

In article <[e-mail]>,  <[e-mail]> wrote:
>Garry Foster <[e-mail]> writes:
>>[e-mail] (Einstein ) wrote:
>
>>:I looking for old plans for a spark gap transmitter.  If you have any
>>:I'd be happy to pay for copying them.
>>:PLEASE no flames!  I know that they are illegal to use.  This is for a
>>:science project and will not be used on amateur or commerical bands.
>>:>George N7BUI
>
>George: The best place to start would be to check a college library.
>Here at UH we have a wealth of info about the history of radio,
>with many books written by the famous pioneers themselves.
>
>Jeff NH6IL

One interesting reference is _Wireless Telegraphy and Telephony Simply
Explained_ by Alfred P. Morgan (Norman W. Henley Publishing Co., 1915).
It shows many circuit diagrams - with the components drawn as pictures -
for both untuned and tuned spark transmitters, and also *spark telephony
transmitters*. Antenna systems are shown in some detail. There are
many photographs of the components (crystal and electrolytic detectors,
close coupled helixes, complete station and portable (military)
equipment...and photos of Jack Irwin and Fesenden. (The description
of the operation of the "Audion" - which was used then only as a
detector - is of course not entirely correct.)

Rane Curl       N8REG




From [e-mail] Fri Aug 18 14:57:31 1995
Path: grape.epix.net!sc2c526a.ra.osd.mil!nova.sti.nasa.gov!lerc.nasa.gov!magnus.acs.ohio-state.edu!math.ohio-state.edu!howland.reston.ans.net!gatech!psinntp!psinntp!psinntp!psinntp!interramp.com!usenet
From: Grant H Youngman <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Where can I find plans for a spark gap transmitter?
Date: 18 Aug 1995 02:30:49 GMT
Organization: PSI Public Usenet Link
Lines: 24
Message-ID: <410u0p$[e-mail]>
References: <4105og$[e-mail]> <410efh$[e-mail]>
NNTP-Posting-Host: ip138.ft.worth.tx.interramp.com
Mime-Version: 1.0
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Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 1.2b5 (Windows; I; 16bit)

Wes Stewart <[e-mail]> wrote:
>[e-mail] (Einstein ) wrote:
>>I looking for old plans for a spark gap transmitter.  If you have any
>>I'd be happy to pay for copying them.
>>
>>PLEASE no flames!  I know that they are illegal to use.  This is for a


>Please consider the unintended consquences of using one of these and find another project.
>
>Maybe you could explain "your" theory. <g>
>

>

GOOD GRIEF GUYS!!! Is everyone on USenet a JERK??  If you don't have the
plans he has been asking for then just shut up, hit the frigging delete
key and move on to the next message.

This is totally uncalled for, boorish, and JUST PLAIN RUDE.

Grant/NQ5T




From [e-mail] Fri Aug 18 14:57:31 1995
Newsgroups: rec.radio.amateur.homebrew
Path: grape.epix.net!news.sprintlink.net!gatech!howland.reston.ans.net!torn!nott!cunews!freenet.carleton.ca!FreeNet.Carleton.CA!bk296
From: [e-mail] (Gordon Symonds)
Subject: Re: Where can I find plans for a spark gap transmitter?
Message-ID: <[e-mail]>
Sender: [e-mail] (Gordon Symonds)
Reply-To: [e-mail] (Gordon Symonds)
Organization: The National Capital FreeNet
Date: Fri, 18 Aug 1995 11:31:21 GMT
Lines: 10

I, for one, think that building a spark gap transmitter is a great idea.
After all, I have just rounded up the parts and designed a transmitter
using PP 10s to go with my 2-tube regenerative ham band receiver.

I shall scan my library and send this intrepid enthusiast whatever
I have.  We builders, after all, must stick together!

Gordon Symonds
Newsletter Editor, Ottawa Vintage Radio Club
(and ham-to-be with my 1926 rig)


From [e-mail] Fri Aug 18 14:57:32 1995
Path: grape.epix.net!news.sprintlink.net!in1.uu.net!panix!news.columbia.edu!konichiwa.cc.columbia.edu!jbaltz
From: [e-mail] (Jerry B Altzman)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Where can I find plans for a spark gap transmitter?
Date: 18 Aug 1995 13:44:55 GMT
Organization: double ionizers association
Lines: 22
Message-ID: <4125gn$[e-mail]>
References: <4105og$[e-mail]>
NNTP-Posting-Host: konichiwa.cc.columbia.edu

In article <4105og$[e-mail]>,
Einstein  <[e-mail]> wrote:
>I looking for old plans for a spark gap transmitter.  If you have any
>I'd be happy to pay for copying them.

Years ago, when I had one of those Radio Shack 100-in-1-run-wires-to-springs
electronics kits, one of the projects they had was a "spark gap generator",
which they said you could test by "looking for interference on your TV"
whenever you turned it on.

Try one of those.

>PLEASE no flames!  I know that they are illegal to use.  This is for a
>science project and will not be used on amateur or commerical bands.

It will be on *all* the bands, unless you are in a Faraday cage...

>George N7BUI

//jbaltz
jerry b. altzman   Entropy just isn't what it used to be      [phone]
[e-mail]   [e-mail]  KE3ML  (HEPNET) NEVIS::jbaltz


From [e-mail] Fri Aug 18 14:57:33 1995
Path: grape.epix.net!sc2c526a.ra.osd.mil!nova.sti.nasa.gov!lerc.nasa.gov!magnus.acs.ohio-state.edu!math.ohio-state.edu!howland.reston.ans.net!tank.news.pipex.net!pipex!news.sprintlink.net!sunic!sunic.sunet.se!newsfeed.tip.net!venere.inet.it!interland!cesare.lavazza
From: [e-mail] (Cesare Lavazza)
Date: 16 Aug 95 18:05:56
Newsgroups: rec.radio.amateur.homebrew
Subject: Where to ftp schematics
Message-ID: <[e-mail]>
Organization: InterLand +39-331 67.72.72 Busto Arsizio VA ITALY
Lines: 7

Hello All!

Does anyone know where to ftp schematics, especially about radio circuits
(preamplifiers, transmitters, receivers)?

-----------------------------------
E-mail: [e-mail]


From [e-mail] Fri Aug 18 14:57:33 1995
Path: grape.epix.net!sc2c526a.ra.osd.mil!nova.sti.nasa.gov!lerc.nasa.gov!magnus.acs.ohio-state.edu!cis.ohio-state.edu!nntp.sei.cmu.edu!news.psc.edu!hudson.lm.com!news.math.psu.edu!news.cac.psu.edu!newsserver.jvnc.net!newsserver2.jvnc.net!howland.reston.ans.net!vixen.cso.uiuc.edu!news.uoregon.edu!news.bc.net!unixg.ubc.ca!van-bc!news.wimsey.com!news.rmii.com!nexus.interealm.com!root
From: [e-mail] (wayne wicks)
Newsgroups: rec.radio.amateur.homebrew
Subject: WTB: Eimac 8874
Date: Fri, 18 Aug 1995 05:29:26 GMT
Organization: ICG/MagNET [phone]
Lines: 4
Message-ID: <41188c$[e-mail]>
Reply-To: [e-mail]
NNTP-Posting-Host: ppp207.interealm.com
X-Newsreader: Forte Free Agent 1.0.82

Looking for a new Eimac 8874

wayne  / wa2kec



From [e-mail] Mon Aug 21 18:13:01 1995
Path: grape.epix.net!news.sprintlink.net!in1.uu.net!news1.digital.com!nntp-hub2.barrnet.net!venus.sun.com!news2me.EBay.Sun.COM!centralnews1.Central.Sun.COM!newsworthy.West.Sun.COM!abyss.West.Sun.COM!myers
From: [e-mail] (Dana Myers)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: A 1915 spark gap transmitter
Date: 19 Aug 1995 06:03:09 GMT
Organization: SunSoft South, Los Angeles, CA
Lines: 57
Message-ID: <413uqt$[e-mail]>
References: <410dd4$[e-mail]> <[e-mail]> <410pb4$[e-mail]> <[e-mail]>
NNTP-Posting-Host: sunspot.west.sun.com

In article <[e-mail]>, Jeff NH6IL <[e-mail]> wrote:
>[e-mail] (Dana Myers) writes:
>><[e-mail]> wrote:
>
>>>If it's a low wattage unit and not connected to an antenna then it's
>>>not illegal to operate. Various vintage radio groups will fire up
>>>their sparkers occassionally to make recordings to send to members and
>>>such. The California Wireless Society made such tapes `off-the-air'.
>
>>Umm, Jeff, maybe you ought to have a look at 47 CFR Part 15 regarding
>>permissible levels of unintended radiation before you make a
>>blanket declaration of the legality of operating a spark gap
>>transmitter.  I'd guess all but the wimpiest SG transmitter
>>violates some of the limits.
>
>Umm, Dana, if we restrict the power lever to that required to fire
>the spark plugs on your motorcycle, then we'll satisfy Part 15. (Have
>you checked your bike for Part 15 compliance? ;)

Given that all three of my remaining motorcycles have resistor spark
plugs (which lengthen the time the spark takes place and significantly
reduces the RFI issue) and happen to contain the spark gaps inside very
small chambers (especially small on the YSR50), they don't create much
interference.  I suspect they'll do just fine from a Part 15 perspective.

>My `blanket declaration' mentioned low wattage with no aerial. A
>potentiometer in series with the primary coil will allow the operator
>to find the minimal voltage needed to fire a spark across the
>electrodes' gap, and we'll want to keep that gap very small. Field
>measurements can then be taken to insure compliance with Part 15,
>while increasing the voltage across the primary coil.

That's not what you originally wrote, but I'm delighted to see that you
can benefit from Internet participation and learn something ;-).

>The previous poster made it sound *completely* illegal to operate
>such an apparatus.
>
>When are you going to get your distemper shot?    |-O

Oh, I don't know; my kids think I'm pretty nice, and my office mate
sometimes accuses me of being a wuss (though I think he's projecting).

When are you going to spend some time learning radio theory and upgrade
that embarrassing General class license? ;-) ;-) ;-)

I know, I still owe you a book publish in the 1980's; I'll hit Jun's and
get the latest Solid State Design for you, though some of the parts in
it are already obsolete, it will be better than a 1915 book....

;-)


--
 * Dana H. Myers KK6JQ, DoD#: j | Views expressed here are      *
 * [phone]               | mine and do not necessarily   *
 * [e-mail]      | reflect those of my employer  *


From [e-mail] Mon Aug 21 18:13:02 1995
Path: grape.epix.net!news.sprintlink.net!in2.uu.net!news.compuserve.com!news.production.compuserve.com!news
From: Jay Craswell <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: A place to download schemtics/fun electronics projects
Date: 20 Aug 1995 15:11:14 GMT
Organization: Dover Research Corp.
Lines: 10
Message-ID: <417jai$hip$[e-mail]>

What format shcematic are you looking for?  I have a slug of stuff I've done in
Circad format.  Course I can output ACAD, Tango, Protel, OrCAD and more with
Circad.  What do you want and in what format?  <grin>  Lots of my stuff is
in the HAMNET area of Compuserve right now if you have access.  Go to LIB 6 and
search Circad or WB0VNE.
73


--
73, Jay WB0VNE - AAV5TH


From [e-mail] Mon Aug 21 18:13:03 1995
Path: grape.epix.net!news.sprintlink.net!howland.reston.ans.net!math.ohio-state.edu!jussieu.fr!univ-lyon1.fr!elendir
From: [e-mail] (Elendir)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: An image rejection filter
Date: 21 Aug 1995 15:16:00 GMT
Organization: ENST - Telecom Paris
Lines: 16
Message-ID: <41a7vg$[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: julia.enst.fr
X-Newsreader: TIN [version 1.2 PL2]

Muenzler, Kevin ([e-mail]) wrote:

: It would be much simpler to build one using the 27.185 crystal and use
: the 26.730 for receive.  You can cannibalize an old broadcast band receiver
: for the 455kHz IF.  Be careful if you bring it to the US, homebrew CB is
: illegal here.

Well, I don't intend to use it as an emitter, just for RX. So I guess
that even American law does not prhibit channel 19 receivers !
Ok for buying a 27.185 MHz XTAL. I guess it's the only cheap and
reliable solution.

Vincent
--
F5RCS - Worldwide Friendship through Amateur Radio
ENST, Ecole Nationale Superieure des Telecommunications, Paris


From [e-mail] Mon Aug 21 18:13:03 1995
Path: grape.epix.net!news.sprintlink.net!newsfeed.internetmci.com!news.compuserve.com!news.production.compuserve.com!news
From: Jay Craswell <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: August QST CMOS Keyer 3
Date: 20 Aug 1995 15:17:42 GMT
Organization: Dover Research Corp.
Lines: 10
Message-ID: <417jmm$hip$[e-mail]>

There are people (like myself) that make a living selling electronic gadgets.
In my Article "Weekend DigiVFO" I included the full source code to the project.
However, depending on the project I think it is up to the author if he or she
wants to spill the beans totaly on a project.  The buyers have to decide if
they want to buy something that way.  If it's ment to be a learning article
complete (and understandable) details are important.  If it's 2 part Microprocessor
Project that took 3 years to code then......  As long as money is involved you
have to expect some of that.  This is America <grin> not a collective.
--
73, Jay WB0VNE - AAV5TH


From [e-mail] Mon Aug 21 18:13:04 1995
Path: grape.epix.net!news.sprintlink.net!newsfeed.internetmci.com!usenet.eel.ufl.edu!usenet.cis.ufl.edu!usenet.ufl.edu!ppp-25-ts1.nerdc.ufl.edu!user
From: [e-mail] (Gary M. Belcaster)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: August QST CMOS Keyer 3
Date: Sun, 20 Aug 1995 16:02:37 -0500
Organization: University of Florida
Lines: 21
Message-ID: <[e-mail]>
References: <417jmm$hip$[e-mail]>
NNTP-Posting-Host: ppp-25-ts1.nerdc.ufl.edu

In article <417jmm$hip$[e-mail]>, Jay Craswell
<[e-mail]> wrote:

> There are people (like myself) that make a living selling electronic gadgets.
> In my Article "Weekend DigiVFO" I included the full source code to the
project.
> However, depending on the project I think it is up to the author if he or she
> wants to spill the beans totaly on a project.  The buyers have to decide if
> they want to buy something that way.  If it's ment to be a learning article
> complete (and understandable) details are important.  If it's 2 part
Microprocessor
> Project that took 3 years to code then......  As long as money is involved you
> have to expect some of that.  This is America <grin> not a collective.
> --
> 73, Jay WB0VNE - AAV5TH

Agreed.  Just don't feature it as a construction article which was clearly
done (see the cover.)

Gary
KA9RAO


From [e-mail] Mon Aug 21 18:13:05 1995
Path: grape.epix.net!news.sprintlink.net!in1.uu.net!news.micron.net!news
From: [e-mail] (Brian Case)
Newsgroups: rec.radio.amateur.homebrew
Subject: Delcom Tranciever
Date: Sat, 19 Aug 1995 17:04:58 GMT
Organization: Micron Internet Services
Lines: 13
Message-ID: <4151q9$[e-mail]>
Reply-To: [e-mail]
NNTP-Posting-Host: cs003p10.nam.micron.net
X-Newsreader: Forte Free Agent 1.0.82

I have a Delcom 960Air Aviation Tranciever that need repaired. Does
anyone know where I can find a schematic for this radio, or where to
send it to have it repaired.

Thanks
Brian

Please email responses to [e-mail]

------------------------------------------------------------
Brian      [e-mail]
------------------------------------------------------------



From [e-mail] Mon Aug 21 18:13:06 1995
Path: grape.epix.net!news.sprintlink.net!in1.uu.net!bud.shadow.net!news
From: Eliot Fenton <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Divide by ten front end for frequency counter
Date: 19 Aug 1995 20:17:17 GMT
Organization: Shadow Information Services, Inc.
Lines: 7
Message-ID: <415gsd$[e-mail]>
References: <40rleh$[e-mail]> <40st8u$[e-mail]> <[e-mail]>
NNTP-Posting-Host: 204.198.46.40
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 1.2b5 (Windows; I; 16bit)

Motorola has a MECL divide by 10 with TTL outputs that's good to 550 MHz;
MC12013.  In addition, Newark, Hammond, etc. have enhanced 7216 series
counter chips that provide period measurement, etc.  It should not be too
difficult to build a 3 GHz unit using a divide by four, xtal reference,
"mar" front end and a handful of support chips.




From [e-mail] Mon Aug 21 18:13:06 1995
Path: grape.epix.net!news.sprintlink.net!in1.uu.net!news.compuserve.com!news.production.compuserve.com!news
From: Jay Craswell <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Drake TR7
Date: 20 Aug 1995 15:23:07 GMT
Organization: Dover Research Corp.
Lines: 6
Message-ID: <417k0r$hip$[e-mail]>

I have one as well.  If I remember right it's just one cut to open up the radio
to full 1.8 to 30MHz.  Now as to how to do it?  I might have a print someplace.
Give me a call on the phone [phone] I have it somewhere.  OH just call
Drake they are still in Biz!
--
73, Jay WB0VNE - AAV5TH


From [e-mail] Mon Aug 21 18:13:07 1995
Path: grape.epix.net!news.sprintlink.net!bga.com!ftp.unisql.com!unisql.unisql.com!news
From: Jim Strohm <jstrohm@blazer>
Newsgroups: rec.radio.amateur.homebrew
Subject: Follow-up: Power Good line on PC PS
Date: 21 Aug 1995 15:36:58 GMT
Organization: UniSQL, Inc.
Lines: 23
Message-ID: <41a96q$[e-mail]>
NNTP-Posting-Host: blazer.unisql.com
X-Newsreader: NCSA Mosaic

Hi all

Thanks for the help with the PC power supply.  I followed the advice of the
first responder, who suggested loading the supply to make it work.

I paralleled two 10-ohm, 2-watt resistors and plugged these into the 5-volt
rail, and all was well.  So if you can use a PC power supply for another
project, This makes for a really simple go/no go tester.

Filtering the hash from the supply won't be necessary for my application,
but should be trivial.  And providing decent shielding for the power supply
should be do-able with aluminum window screen.

When/if I have more updates I'll share them.  By the way, junked power
supplies are an excellent source of muffin fans, and some power supplies
have usable high-voltage filter caps suitable for voltage multiplier
HV supplies. The trick lies in getting the kitchen can opener to work on
the supply case.

Jim N6OTQ
standard disclaimer




From [e-mail] Mon Aug 21 18:13:08 1995
Path: grape.epix.net!news.sprintlink.net!cs.utexas.edu!swrinde!sgigate.sgi.com!enews.sgi.com!lll-winken.llnl.gov!fnnews.fnal.gov!nntp-server.caltech.edu!almach.caltech.edu!shoppa
From: [e-mail] (Timothy D. Shoppa)
Newsgroups: rec.radio.amateur.homebrew,rec.crafts.metalworking
Subject: Re: How to Space-Wind Coils?
Date: 21 Aug 1995 11:24 PST
Organization: California Institute of Technology
Lines: 27
Distribution: world
Message-ID: <[e-mail]>
References: <[e-mail]> <[e-mail]> <[e-mail]>
NNTP-Posting-Host: almach.krl.caltech.edu
News-Software: VAX/VMS VNEWS 1.41
Xref: grape.epix.net rec.radio.amateur.homebrew:9092 rec.crafts.metalworking:15339

In article <[e-mail]>, [e-mail] (Alan M. Horowitz) writes...

>>How about winding on the threads of a bolt or machine screw?  It works
>>great.  Thanks to Ten-Tec for this tip, from their 6-meter transverter
>>kit instructions.
>
>    Sounds good. What are the tolerances of garden-variety bolts, with respect
>    to threads-per-inch and linearity thereof?

The worst piece of new 1/4"-20 threaded rod I've ever run across was off by
about half a thread over a length of one foot.  That would be 1/40th
of an inch out of 12 inches, or about 1 part in 500.  At the time
I did the measurement, I thought this was pretty good for ordinary
hardware-store threaded rod; I would
expect bolts to be much more precise.

In my experience with winding coils, 1 part in 500 in the spacing
is *not* something to worry about!  When you remove the
coil from the bolt, the spacing is likely to change much more
than this.

The diameter of a bolt (or
the depth of the threads) is likely to vary much more than the
thread spacing, but still probably wouldn't be all that important
compared to the distortion that will happen after the bolt is removed.

Tim. ([e-mail])


From [e-mail] Mon Aug 21 18:13:08 1995
Path: grape.epix.net!news.sprintlink.net!in2.uu.net!psinntp!psinntp!psinntp!psinntp!main03!landisj
From: [e-mail] (Joe Landis - Systems & Network Mgr)
Newsgroups: rec.radio.amateur.homebrew,rec.radio.swap
Subject: Info on X band TWT???
Message-ID: <[e-mail]>
Date: 18 Aug 95 23:02:33 EST
Distribution: world
Organization: North American Drager - Telford, PA
Lines: 10
Xref: grape.epix.net rec.radio.amateur.homebrew:9055 rec.radio.swap:41793

Hi,
I came across a Teledyne/MEC M5842-A TWT. Based on the WR90 output flange, it
looks like it may be usable on 10Ghz. Anybody have any info on it, data sheet,
or a contact to the mfr?

Thanks,
Joe - AA3GN
--
Joe Landis - Systems and Network Manager - North American Drager - Telford, PA
[e-mail]                        ..speaking only for mysel


From [e-mail] Mon Aug 21 18:13:10 1995
Path: grape.epix.net!news.sprintlink.net!in1.uu.net!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail
From: [e-mail] (HAM R LUND)
Newsgroups: rec.radio.amateur.homebrew
Subject: Items forsale
Date: 20 Aug 1995 17:33:12 -0400
Organization: America Online, Inc. (1-800-827-6364)
Lines: 139
Sender: [e-mail]
Message-ID: <4189mo$[e-mail]>
NNTP-Posting-Host: newsbf02.mail.aol.com
X-Newsreader: AOL Offline Reader

*********************************************************
*********************************************************
CONTACT: Robert [e-mail]
Ph.517-789-6721...............................................
1215 Winifred....Jackson, Mich.  49202-1946
      |   |
   ---|---|--->   the Hammarlund guy
      |   |
*********************************************************
*********************************************************
the following is a list of items for sale
All pricing includes shipping..................
                                          REVISED: 8-4-95-PM
PARTS*****************************************************
Of course Hammarlund, if you need something let me know...to much to list,
NOT even Andrew wanted to take the list...  : > )))

****** air variables

have the following for sale, capacity listed where known. most have no
boxes,
all are poly-bagged.  will sell by the piece or trade all for Hammarlund
equipment, manuals, accessories, literature, ect.

If no price is listed...it is $10.00 each

qty.- part# - capacity (if known)
Hammarlund:

1/ 34604-5
1/ 34604-6
1/ 351-1059
1/ 4111-49
1/ 48A084
1/ 5003-C  C1C
1/ 9404-18-00040
2/ 9411-72-50379
2/ 9411-72-60348
1/ 11727-77
1/ A8H501
1/ APC 25      3.0-25.
4/ ASP 100 G                 $13.00 ea
1/ APC 100     5.5-100     $13.00 ea
5/ APC 140     6.7-140     $13.00 ea
1/ B-253-124-2
1/ B-7485-440-2
1/ C 67380
3/ CT 1E040     5.0-40
1/ CT 1E075     6.0-75.
1/ CT 1F040     5.0-40.
1/ CT 3C040
1/ CT 14E042-M  5.0-42
1/ CT 14E042-J   3.0-10.
1/ CT 14F010-J   3.0-10.
1/ CT 14F042-J   5.0-42
1/ CT 1316047-J  5.5-47.
2/ ES 676693-5
2/ KS-13772
3/ KS-13998L1
1/ KS 18998L14
1/ MACBF-3      1.3-3.1   N.I.B.
1/ MAC-5        N.I.B.
1/ HF-15-X       N.I.B.
1/ HF-50          N.I.B.
1/ MAC-20   2.0-21.5
2/ MABF-8   2.0-7.9
1/ MAPC-100   4.5-100.    $13.00
1/ MCD-35 MX   6.0-31.    $15.00
1/ MJ-50-5
1/ P-31800014
1/ P-7761345-15
1/ 34452-40
4/ 841690
1/ 7765659-1           $25.00


CARDWELL

2/ A-105623     25MuFD   $18.00 ea
3/ ZU-100-AS   3.0-100.   $15.00 ea


B&W

1/ CX-62-C : This is the cap used with the KW plug-in coils  $75.00  new
no
box

BUD

1/  1615  AIR GAP-300     75MMFD     $65.00   new no box

EFJ

1/ ? DUAL SECTION 14 3/4" L x 5.50" W  1/8" spacing  (approx. measurments)
$95.00
1/ 48c075  air gap .175  dual sec.,  9.75" L x 4" W             $65.00
1/  ?  5.75" L x  4" W  single sec. 1/8 " spacing                 $55.00
1/  4134MS4  edge wound  41 uh                                      $75.00

*******  BOOKS  &  MANUALS

********************** HAMMARLUND MANUAL SALE
******************************

I have a limited number of new manuals i got when i purchased the
inventory
of
Wayne Cordell.....
These are unused originals. some may have a fade area on the cover from
storage before I got them, yet others look almost as they did 35+ years
ago.
these are new unused and in unread condition.

Here's whats available:

HQ-100.........................$23.00 ea
HQ-145-A......................$23.00 ea
HXL ONE AMP..............$23.00 ea
HX 50............................$23.00 ea
HX-500..........................$23.00 ea

Get them while they last.  I have never made them available in such away
before. This is a unique oppertunity......
SUPPLIES ARE LIMITED.....FIRST COME FIRST SERVE...........

THE FOLLOWING WILL BE  'COPIES'.    Prices are shipped.

HAMMARLUND
Comet Pro    2nd Edition                          20.00
Comet Pro    manual 3  AVCModel            20.00
Four 20 xmitter & four 11 modulator           20.00
RGB  CHC 46140 / CHC 49154 (120X)       20.00
HQ-100                                                   18.00
HQ-100A                                                 18.00
HQ-105TR / TRS                                      18.00
HQ-110                                                   18.00
HQ-110A                                                 18.00
HQ-120X                                                 18.


From [e-mail] Mon Aug 21 18:13:10 1995
From: [e-mail] (Bob Tournoux)
Subject: Re: July QEX
Date: 20 Aug 95 18:49:14 -0700
References: <406q2m$[e-mail]> <40957e$[e-mail]>
Message-ID: <[e-mail]>
Path: grape.epix.net!news.sprintlink.net!news.msn.com!msn.com
Newsgroups: rec.radio.amateur.homebrew
Organization: The Microsoft Network (MSN)
Lines: 5

Got mine... but its now August 20, 1995 -- so hope you got yours too!

Bob

73 KF8QU


From [e-mail] Mon Aug 21 18:13:11 1995
Path: grape.epix.net!news.sprintlink.net!cs.utexas.edu!not-for-mail
From: [e-mail] (Muenzler, Kevin)
Newsgroups: rec.radio.amateur.antenna,rec.radio.amateur.equipment,rec.radio.amateur.homebrew,rec.radio.amateur.policy,rec.radio.amateur.space
Subject: Mail Failure - Apology
Date: 18 Aug 1995 15:25:35 -0500
Organization: UTexas Mail-to-News Gateway
Lines: 5
Sender: [e-mail]
Message-ID: <[e-mail]>
NNTP-Posting-Host: news.cs.utexas.edu
Xref: grape.epix.net rec.radio.amateur.antenna:13097 rec.radio.amateur.equipment:16026 rec.radio.amateur.homebrew:9052 rec.radio.amateur.policy:29041 rec.radio.amateur.space:4627

My apologies to the list(s).  We had a system failure on our end.
It has been corrected.

Kevin, WB5RUE
[e-mail]


From [e-mail] Mon Aug 21 18:13:11 1995
Path: grape.epix.net!news.sprintlink.net!howland.reston.ans.net!ix.netcom.com!netnews
From: [e-mail] (Andrew Glass)
Newsgroups: rec.radio.amateur.homebrew
Subject: Need B-Scan Scope Tube
Date: Sat, 19 Aug 1995 01:30:52 GMT
Organization: Netcom
Lines: 4
Distribution: world
Message-ID: <413b7t$[e-mail]>
NNTP-Posting-Host: ix-tf1-22.ix.netcom.com
X-Newsreader: Forte Agent .99.82

I am looking for a source for a B-Scan S159P1 Scope tube.  It is 3"
round and goes in an old O.A.R. direction finding unit.  Any leads you
could give me would be appreciated...     73  Andy WD4MYL



From [e-mail] Mon Aug 21 18:13:12 1995
Path: grape.epix.net!news.sprintlink.net!simtel!swidir.switch.ch!scsing.switch.ch!news.belwue.de!news.uni-stuttgart.de!moritz
From: [e-mail] ()
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Need help modifying older handheld for 2M
Date: 21 Aug 1995 09:59:45 GMT
Organization: Comp.Center (RUS), U of Stuttgart, FRG
Lines: 20
Message-ID: <419leh$[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: ipers1.e-technik.uni-stuttgart.de

In article <[e-mail]>,
Kendel McCarley  <[e-mail]> wrote:
>Changing the crystals seems rather trivial, but I don't know what I need
>to do to tune the rest of the radio for two meter use.  I don't have any
>schematics for these radios.

Kendel,

*changing* the crystals might be trivial, but nowdays you might find
it difficult to obtain the needed crystals at a price substantially
less than a s/h 2m HT. If you can find the frequencies of the crystals
employed you may be able to work out the frequency for your desired
channels. the rest is fairly easy, even without schematics: Locate
the TX and RX multiplier chains, tweak them up with a diode RF probe
(You may have to check if you are on the right overtone)
tweak the RX input and PA, and off you go.


73, Moritz DL5UH



From [e-mail] Mon Aug 21 18:13:13 1995
Path: grape.epix.net!news.sprintlink.net!gatech!ncar!noao!CS.Arizona.EDU!news.Arizona.EDU!usenet
From: Kendel McCarley <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Need help modifying older handheld for 2M
Date: Fri, 18 Aug 1995 18:44:51 -0700 (MST)
Organization: The University of Arizona
Lines: 22
Message-ID: <[e-mail]>
NNTP-Posting-Host: stat.nursing.arizona.edu
Mime-Version: 1.0
Content-Type: TEXT/PLAIN; charset=US-ASCII

I picked up a box of older, crystal-controlled 150 MHz band FM
transceivers that were headed for the trash can after the owner denuded
them of antennaes.  They will all operate on two channels and have seperate
crystals for send and receive.  The two models that I have several of
seem to have remarkable similar circuitry (same Motorola parts, similar
layout, etc.).   Yes, they all seem to work for their current frequencies.

Changing the crystals seems rather trivial, but I don't know what I need
to do to tune the rest of the radio for two meter use.  I don't have any
schematics for these radios.  Does somebody have any pointers to
schematics or (better yet) advice on how to use these on two meters.
I've had my license for over a year and, being a poor grad student, would
just love to finally get on the air for the cost of a little time.

The radios are:  Regency UC102 and Fujitsu Ten Limited FTP15-292L

Thanks,


Kendel McCarley                                   [e-mail]
KC7FRS                            http://www.nursing.arizona.edu/~kendelm



From [e-mail] Mon Aug 21 18:13:14 1995
Path: grape.epix.net!news.sprintlink.net!nwfocus1.wa.com!news1.halcyon.com!coho.halcyon.com!mcraw
From: Marshall Craw <[e-mail]>
Newsgroups: rec.radio.swap,rec.radio.amateur.equipment,rec.radio.amateur.homebrew,rec.radio.amateur.digital.misc
Subject: NEW HAM RADIO REMOTE CONTROL PRODUCT OFFERED
Date: Fri, 18 Aug 1995 22:19:38 -0700
Organization: Northwest Nexus Inc.
Lines: 29
Message-ID: <[e-mail]>
References: <[e-mail]> <[e-mail]>
NNTP-Posting-Host: coho.halcyon.com
Mime-Version: 1.0
Content-Type: TEXT/PLAIN; charset=US-ASCII
In-Reply-To: <[e-mail]>
Xref: grape.epix.net rec.radio.swap:41907 rec.radio.amateur.equipment:16084 rec.radio.amateur.homebrew:9093 rec.radio.amateur.digital.misc:10135


  I am pleased to announce a new product offered by Positive Time Systems
  called the RCS-I.  This is a radio controller that connects to any VHF/UHF
  transceiver and can issue x-10 commands. (X-10 is a power line standard
  for controlling devices throughout a building. Sears, Radio Shack, and
  others offer these compatible units)
   The unit also has an alarm input, a listen feature, a short voicmail box,
  and responds to all commands in a pleasant female voice. The system IDs
  with your recorded voice and call sign.  This description doesn't do the
  product justice, so please check out the new homepage at :

                  http://www.halcyon.com/pos.time.sys/top

  or you may email us with you address so that we can promptly send you
  our brochure and newsletter.

  NOTE: This product is intended for US voltages of 120 / 220 VAC.  Another
  version is offered to support other international power standards.

  FLASH! NEW FEATURE!  The RCS-I has a new feature called Secure Access
  Mode(SAM).  When enabled, the access code changes dozens of times per
  hour, making it virtually impossible to hack into.

  Thank You,

  Marshall Craw  <[e-mail]>
  Positive Time Systems
  North Bend, WA



From [e-mail] Mon Aug 21 18:13:15 1995
Newsgroups: rec.radio.amateur.homebrew
Path: grape.epix.net!news.sprintlink.net!mv!wd1v.mv.com!user
From: [e-mail] (John Seney)
Subject: New Mac Ham Radio Test Simulators
Message-ID: <[e-mail]>
Nntp-Posting-Host: wd1v.mv.com
Sender: [e-mail] (System Administrator)
Organization: MV Communications, Inc.
Date: Mon, 21 Aug 1995 10:32:42 GMT
Lines: 62

       The new Macintosh Ham Test Simulators are HERE!

              Novice Ham Test 5.0 SA.sea
              Technician Ham Test 5.0 SA.sea
              General Ham Test 5.0 SA.sea
              Advanced Ham Test 5.0 SA.sea
              Extra Ham Test 5.0 SA.sea

The latest versions feature:

    HyperCard 2.3 as a stand-alone application (SA) eliminating
    the need to have HyperCard. All you need is a Mac with 4
    Meg of memory and version System 7 or greater.

    Each version 5 Ham Test Simulator has the latest questions
    as prepared by the Question Pool Committee.

    Each Ham Test Simulator is FREE OF CHARGE and work the
    same way as the originals written by Diana, KC1SP.

You may obtain a Ham Test Simulator by mailing me a *FORMATTED
disk (1 per test) and include a Self Addressed and Stamped disk
mailer for the return.

Each Ham Test Simulator is also bundled with a shareware CW
program called MacMorse 1.4 written by Doug, WB0EON.

Also included are a collection of text files that relate an
interesting variety of ideas about the best way to study CW and
prepare for tests.

or warm your phone line and get just the tests:

America On Line - Macintosh Ham Radio Section

ftp://oak.oakland.edu//pub3/hamradio/mac/theory-and-morse/AdvancedHamTest1.sea.bin
ftp://oak.oakland.edu//pub3/hamradio/mac/theory-and-morse/ExtraHamTest.sea.bin
ftp://oak.oakland.edu//pub3/hamradio/mac/theory-and-morse/GeneralHamTest.sea.bin
ftp://oak.oakland.edu//pub3/hamradio/mac/theory-and-morse/NoviceHamTest.sea.bin
ftp://oak.oakland.edu//pub3/hamradio/mac/theory-and-morse/TechnicianHamTest.sea.bin

Your comments and suggestions for future versions are always
welcome. Stay in touch and good luck with your next test!

73,


\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/
John D. Seney, WD1V                Internet:      [e-mail]
144 Pepperidge Drive        America On Line:        [e-mail]
Manchester, NH 03103-6150         AX.25 Pkt: [e-mail]
(H) 603-668-1096                   Ampernet:    [e-mail]
\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/
LeCroy Sales Engineering -  Maine, New Hampshire, and Northeastern
                            Massachusetts
(O) 800-553-2769      (F) 603-627-1623    (P) 800-SKYPAGE #5956779

   All opinions are my own, including Digital Storage Scope.FAQ

 To obtain the latest copy automatically, simply send me an EMAIL
       with "subscribe scope.faq" in the subject field.
\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/


From [e-mail] Mon Aug 21 18:13:16 1995
Newsgroups: rec.radio.amateur.misc,rec.radio.amateur.homebrew
Path: grape.epix.net!news.sprintlink.net!in2.uu.net!iglou!dp013
From: [e-mail] (Chris Sakkas)
Subject: New Web site for Amateur Radio
X-Nntp-Posting-Host: dp013.ppp.iglou.com
Message-ID: <[e-mail]>
Sender: [e-mail] (News Administrator)
Organization: IgLou Internet Services
X-Newsreader: News Xpress Version 1.0 Beta #4
Date: Fri, 18 Aug 1995 14:25:28 GMT
Lines: 24
Xref: grape.epix.net rec.radio.amateur.misc:85181 rec.radio.amateur.homebrew:9049

We've recently added an Amateur Radio page to our web site!

Our web address is:
http://www.iglou.com/ITU

and our anonymous ftp address is:
ftp://iglou.com/members/ITU

We also have some files on PC-interfacing and general electronics-related material
available on our ftp site.

We would appreciate any comments and suggestions, especially additions or
corrections to links on our page.  Please keep in mind that we have just added
this page and will continue to make updates!

Thanks!

Chris

----------------------------------------------------------------------
Chris B. Sakkas ([e-mail])  http://www.iglou.com/ITU
ITU Technologies ([e-mail])    ftp://iglou.com/members/ITU
Complete PIC programming packages starting at only $29!
See our web page or e-mail us today for more info!


From [e-mail] Mon Aug 21 18:13:17 1995
Path: grape.epix.net!news.sprintlink.net!howland.reston.ans.net!tank.news.pipex.net!pipex!in1.uu.net!tadpole.com!tivoli.tivoli.com!usenet
From: Tim Deagan <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: OScope for VHF/UHF VSWR?
Date: 18 Aug 1995 18:19:33 GMT
Organization: thInk AgAIn services
Lines: 26
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I just got my tech class ticket and am starting to put my
shack together.  I don't have much radio gear (yet ;-)
but I do have a lot of electronics gear.

I have OScopes at 35MHz, 50MHz and 75MHz.  I would love to put
these to use in my shack.  Can someone point me at articles
that would help me in getting the most out of these for use in
HAM activity (I'm a digital guy, I've only used them for
monitoring trigger conditions, etc.)?

I would specifically like to put off purchasing a VSWR meter
for a little while (until my the cost of a new HT wears off :-)

Advice in mail or news is also appreciated!

73
--Tim, KC5QFG

--
 ,----,                 <> ReVTiM <>                   .----.
{ <> /-------------------\ KC5QFG /---------------------\ <> }
 `--(   [e-mail]  http://www.fc.net/~tdeagan   )--'
     `--------------------------------------------------'




From [e-mail] Mon Aug 21 18:13:17 1995
Path: grape.epix.net!news.sprintlink.net!howland.reston.ans.net!Germany.EU.net!news.dfn.de!news.belwue.de!news.uni-stuttgart.de!moritz
From: [e-mail] ()
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: OScope for VHF/UHF VSWR?
Date: 21 Aug 1995 09:50:51 GMT
Organization: Comp.Center (RUS), U of Stuttgart, FRG
Lines: 13
Message-ID: <419ktr$[e-mail]>
References: <412ljl$[e-mail]>
NNTP-Posting-Host: ipers1.e-technik.uni-stuttgart.de

In article <412ljl$[e-mail]>,
Tim Deagan  <[e-mail]> wrote:
>I would specifically like to put off purchasing a VSWR meter
>for a little while (until my the cost of a new HT wears off :-)

Hi Tim,

Sorry to say so, but oscilloscopes are about as usefull for measuring
swr as are CD players. If cash is an issue, consider building a SWR
meter, or sell your hand held to buy some decent equipment.

73, Moritz DL5UH



From [e-mail] Mon Aug 21 18:13:18 1995
Newsgroups: rec.radio.amateur.homebrew
Path: grape.epix.net!news.sprintlink.net!in2.uu.net!iglou!dp072
From: [e-mail] (Chris Sakkas)
Subject: Re: Pcb & iron-on transfer
X-Nntp-Posting-Host: dp072.ppp.iglou.com
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In article <[e-mail]>,
   Garry Foster <[e-mail]> wrote:
>There is a very complete article on this in this months issue of "Nuts
>and Volts". The author is sold on it but has went to some expense in
>setting up. There have been some good discussions on this is
>sci.electronics over the past few months. Many swear by it and some swear
>at it. I have no experance but from what I have read would give it a try
>if I had a laser printer.
>
>                                               Garry
>
>PS
>I've found many reluctent to allow anyon eto stick strange stuff in thier
>printers/copiers.

I've had _very_ good results using Techniks' Press-n-Peel Blue sheets.  Some
experimentation is required to find the appropriate ironing temperature, and you must
allow the board to cool completely before removing the sheet.  I've made many single
and double sided prototypes this way with great results!  I'm using a laserjet 4P
printer, if that makes any difference.

Good luck,

Chris

----------------------------------------------------------------------
Chris B. Sakkas ([e-mail])  http://www.iglou.com/ITU
ITU Technologies ([e-mail])    ftp://iglou.com/members/ITU
Complete PIC programming packages starting at only $29!
See our web page or e-mail us today for more info!


From [e-mail] Mon Aug 21 18:13:19 1995
Path: grape.epix.net!news.sprintlink.net!europa.chnt.gtegsc.com!howland.reston.ans.net!nntp.crl.com!crl14.crl.com!not-for-mail
From: [e-mail] (Stephen Dunifer)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Pcb & iron-on transfer
Date: 20 Aug 1995 15:12:08 -0700
Organization: CRL Dialup Internet Access        [phone]  [Login: guest]
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I am not sure why everyone is stuck on the iron-on transfers.  I have
tried this with limited results.  Instead, we just have the circuit board
house we work with laminate the positive working film they use to a blank
panel.  Then in a dark room, I just cut off the size needed for a
prototype.  Just run your pattern on overhead film for the positive and
expose the board with a UV rich light source (sun lamp).  Develop in
sodium carbonate (one cup per 15 gallons of H2O), rinse and then etch.
This is far cheaper than what is charged for the film and produces much
better and consistent results.  Most areas have circuit board shops that
will probably be willing to do this.  It seems someone could really do
the home shop market a service by just buying a laminator and supplying
via mail order panels already to go.  We are busy enough but a retired
amateur could certainly augment his or her income in this manner.

Stephen Dunifer



From [e-mail] Mon Aug 21 18:13:20 1995
Path:   grape.epix.net!news.sprintlink.net!news.primenet.com!news.primenet.com!ip160.msp.primenet.com!user
From: [e-mail] (David Donaldson)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Pcb & iron-on transfer
Date: Mon, 21 Aug 1995 09:54:45 -0600
Organization: Primenet
Lines: 6
Message-ID: <[e-mail]>
References: <[e-mail]> <[e-mail]> <[e-mail]> <418bvo$[e-mail]>
NNTP-Posting-Host: ip160.msp.primenet.com

I have found overhead transparencies and a copy machine work well.  The
toner is consistant and the lines are crisp.  I could never get the paper
method to work.  Could not get the pressure proper.  Be carefull with the
transparencies though,  they will melt to heated to hot.

Dave, WB7dru


From [e-mail] Mon Aug 21 18:13:20 1995
Newsgroups: rec.radio.amateur.homebrew
Subject: Phone Line Status Indicat
From: [e-mail] (Clint Bradford)
Path: grape.epix.net!news.sprintlink.net!holonet!colossus.holonet.net!wwswinc!clint.bradford
Distribution: world
Message-ID: <[e-mail]>
Date: Wed, 16 Aug 95 23:56:00 -0500
Organization: WoodyWare Software, Inc. - 516-736-6662
Lines: 10

Subject: Phone Line Status Indicator

>>I'm looking for a circuit that I can add to a phone/phone line to show
>>if the line is in use.

Radio Shack carries such an item. . .uses a 9-Volt battery - which lasts
over a year. I installed mine on the kitchen phone, so my family would
know if I was on the modem in the office....
---
 ■ wcECHO 4.1 ≈ AR-Net: ATTENTION to Details ■ Mira Loma, CA ■ 909-681-6221


From [e-mail] Mon Aug 21 18:13:21 1995
Path: grape.epix.net!news.sprintlink.net!howland.reston.ans.net!news-e1a.megaweb.com!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail
From: [e-mail] (W8JI  Tom)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Pin Diodes
Date: 19 Aug 1995 03:59:41 -0400
Organization: America Online, Inc. (1-800-827-6364)
Lines: 18
Sender: [e-mail]
Message-ID: <4145ld$[e-mail]>
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>>Try building a half wave rectifier with it.  A PIN diode won't
>>rectify very well.

>>N6RK

Add to that....at higher frequencies. They work fine at low frequencies
and depending on doping they have about the same forward drop as a
conventional rectifier at dc.

The best way to tell is to look up the number in a listing or contact the
manufacturer. Any test would have to be exhaustive and involve testing at
the operating frequency range of the diodes. Some PIN diodes work as PIN's
at fairly low frequencies (like 1.8 or 3.5 MHz), but most do not behave
like PIN diodes until mid HF, upper HF, or VHF is reached. The voltage
drop is no way to tell, and neither is LF or any dc parameters.

73 Tom


From [e-mail] Mon Aug 21 18:13:21 1995
Path: grape.epix.net!news.sprintlink.net!newsfeed.internetmci.com!news.uoregon.edu!sanjuan.amtsgi.bc.ca!salmon!clinton.peebles
From: [e-mail] (Clinton Peebles)
Newsgroups: rec.radio.amateur.homebrew
Subject: Ramsey LPA-1 amp.
Date: Sun, 20 Aug 1995 13:59:42 GMT
Message-ID: <[e-mail]>
Organization: Salmon Siding Saloon BBS 604-357-9942
Distribution: world
Lines: 6

Does anyone have the schematics for Ramsey's PA-1 2 meter amp?  If so
can I please have a copy? E-mail me and I'll e-mail my fax number if
you wish, or my snail mail address, or if you have a scanner, e-mail
me a GIF.  My E-Mail address is [e-mail]

Thanks.  Clinton VE7KNL


From [e-mail] Mon Aug 21 18:13:22 1995
Newsgroups: rec.radio.amateur.homebrew
Path: grape.epix.net!news.sprintlink.net!in2.uu.net!pipeline!psinntp!psinntp!psinntp!voder!nsc!news
From: "Al Koblinski  (W7XA)" <[e-mail]>
Subject: Re: RF TRANSISTORS??
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Several places.  Richardson Electronics, Penstock, Allied Radio, Newark
Electronics, etc.
They all use the same price lists and for small quantities they will all
be about the same price.
Ham or electronic Flea markets or surplus dealers are another
possibility but may not have what you want and may be more trouble than
the money you save.
Unfortunately there are not many manufacturers and thus not much
competition, especially in very small quantities.




From [e-mail] Mon Aug 21 18:13:23 1995
Newsgroups: rec.radio.amateur.homebrew
Path: grape.epix.net!news.sprintlink.net!newsfeed.internetmci.com!usenet.eel.ufl.edu!col.hp.com!news.dtc.hp.com!hpscit.sc.hp.com!icon!greg
From: [e-mail] (Greg Dolkas)
Subject: Re: TNC plans needed
Sender: [e-mail] (News Administrator)
Message-ID: <[e-mail]>
Date: Fri, 18 Aug 1995 23:03:22 GMT
References: <40vjp1$[e-mail]>
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 ([e-mail]) wrote:
: begin 644 btnc.gif
: M1TE&.#=AZ`/N`K,``/___P``````_^#@__\```#_`/___P```/___P``````
: M_^#@__\```#_`/___P```"P`````Z`/N`@`$_Q#(2:N]..O-N_]@*(YD:9YH

Neat schematic...  Where does one get the TCM3105 chip?  Software?

Greg  KO6TH


From [e-mail] Mon Aug 21 18:13:23 1995
Path: grape.epix.net!news.sprintlink.net!newsfeed.internetmci.com!solaris.cc.vt.edu!mkeitz
From: [e-mail] (Mike Keitz)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: TNC plans needed
Date: Sat, 19 Aug 95 00:02:19 GMT
Organization: TSE Systems
Lines: 30
Message-ID: <4139oe$[e-mail]>
References: <40vjp1$[e-mail]> <[e-mail]>
NNTP-Posting-Host: mkeitz.beve.blacksburg.va.us
X-Newsreader: News Xpress Version 1.0 Beta #4

In article <[e-mail]>,
   [e-mail] (Greg Dolkas) wrote:
> ([e-mail]) wrote:
>: begin 644 btnc.gif
>: M1TE&.#=AZ`/N`K,``/___P``````_^#@__\```#_`/___P```/___P``````
>: M_^#@__\```#_`/___P```"P`````Z`/N`@`$_Q#(2:N]..O-N_]@*(YD:9YH
>
>Neat schematic...  Where does one get the TCM3105 chip?  Software?
>
>Greg  KO6TH

TCM3105's are still made, probably solely for the ham market.  Newark, JDR,
and Jameco would be good US places to check, as well as any full-line TI
distributor.  I don't think anyone other than Texas Instruments made them.

I didn't look at the schematic, make sure there is a provision for
adjusting the bias level on Pin 7 as this is critical for good reception.
Sometimes the design is cheapened by using 2 fixed resistors rather than a
pot there and this may not work well with some 3105's.

As for software, download Baycom 1.5 from your choice of a large number of
ftp archives.  This is good entry-level end-user AX.25 terminal software.
Various other software drivers for other applications are also available.
The Baycom group also maintains a Web page at http://www.baycom.de.

-Mike KD4QDM






From [e-mail] Mon Aug 21 18:13:24 1995
Newsgroups: rec.radio.amateur.homebrew
Path: grape.epix.net!news.sprintlink.net!gatech!psinntp!psinntp!psinntp!psinntp!voder!nsc!news
From: "Al Koblinski  (W7XA)" <[e-mail]>
Subject: Re: Trouble with MRF141G - 300 watt amp
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Sounds like the gate has somehow been shorted to the drain.  The device
has thousands of gates (and transistors) in parallel and if a few of the
gates get shorted to the drain due to ESD, the condition you see will
exist.  You could (carefully) check with an ohmmeter between gate to
drain or source and if there is any resistance value less than infinite,
you may have killed the part.  Despite the fact it is a 'power
transistor', MOSFETS are ESD sensitive and can be all too easily
damaged.
If you cannot measure any reisistance less than infinity on the highest
range, try a putting a few (<5) volts negative on the gate and see if
the current will diminish. It's very rare but sometimes a contamination
can shift the threshold down.
I think the device is woulded.  Sorry.
73, Al




From [e-mail] Mon Aug 21 18:13:25 1995
Path: grape.epix.net!news.sprintlink.net!tank.news.pipex.net!pipex!oleane!jussieu.fr!univ-lyon1.fr!elendir
From: [e-mail] (Elendir)
Newsgroups: rec.radio.amateur.homebrew
Subject: VCO noise, again - with a PLL
Date: 20 Aug 1995 10:18:30 GMT
Organization: ENST - Telecom Paris
Lines: 16
Message-ID: <41725m$[e-mail]>
NNTP-Posting-Host: julia.enst.fr
X-Newsreader: TIN [version 1.2 PL2]

Hi everybody,
I'm back with that VCO noise problem.

This time, however, I'd like to know how much can a PLL with, let's say a
reference of F Hz, reduce a VCO noise under F.
Does anybody have any clue ?
And then, is there a special way to design the loop filter in order to
improve the noise figure while keeping all other parameters (lock time,
sideband suppression) acceptable ?

Thanks,
Vince

--
F5RCS - Worldwide Friendship through Amateur Radio
ENST, Ecole Nationale Superieure des Telecommunications, Paris


From [e-mail] Mon Aug 21 18:13:26 1995
Path: grape.epix.net!news.sprintlink.net!in1.uu.net!bud.shadow.net!news
From: Eliot Fenton <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: VCO noise, again - with a PLL
Date: 21 Aug 1995 14:16:02 GMT
Organization: ICS Inc.
Lines: 41
Message-ID: <41a4f2$[e-mail]>
References: <41725m$[e-mail]>
NNTP-Posting-Host: 204.198.46.30
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To: [e-mail]

Vince..............
I came into your discussion late, however it appears you are asking
about phase noise with regards to VCO's and loop filters.  In a nutshell:

Phase noise is related to reference noise, vco noise, divider noise, VCC
noise, etc..  The output noise of the VCO within the 3 db bandwidth of
the loop filter is approximately (and I use that term "very loosely)
equal to 20logN times the phase noise of the reference oscillator, where
N is the division ratio.  For example, if your reference oscillator is 1
MHz with a phase noise of -150 dBc at 10 KHz, and your 300 MHz VCO is
phase locked to it, then your 300 MHz phase noise at 10 KHz offset would
be 20log(300MHz/1MHz) + (-150 dBc) = -100.5 dBc.  Essentially, the phase
noise of the reference is "multiplied up" by the division ratio.

The Phase noise limit for CMOS dividers is approx. -150 dBc; for ECL
approx. -130 dbc.  This should give you an idea of the ultimate phase
noise floor you will achieve with various components.

As far as your question regarding sideband suppression and noise, these
are all tradeoffs which the designer has to contend with.  When designing
low noise units, it's customary to use different phase detectors for
different applications.  A sample and hold is good for low noise, but
not for acquisition or switching speed.  Conversely, the tri-state
detector is good for speed and acquistion, but only mediocre as far as
noise is concerned.

Obviously, there is a great deal of information that you will have to
digest to understand the subject completely, certainly much more than I
can explain here.  I suggest starting with a book by Floyd Gardner, PLL
techniques (I think that's the name, but don't quote me) which is a
classic in the industry.  Keep me posted on your progress.

Incidentally, my company specializes in VCO and synthesizer design, so if
you run into any problems, one of our engineers is sure to have an
answer, or at the very least steer you in the right direction.

Best Regards,

Eliot Fenton
ICS



From [e-mail] Mon Aug 21 18:13:26 1995
Path: grape.epix.net!news.sprintlink.net!howland.reston.ans.net!newsjunkie.ans.net!esol.intermedia.com!news
From: [e-mail]
Newsgroups: rec.radio.amateur.misc,rec.radio.amateur.homebrew,rec.radio.amateur.antenna
Subject: Wanted: Old Test Equip. Catalogs
Date: Mon, 21 Aug 95 08:43:09 PDT
Organization: (None)
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Xref: grape.epix.net rec.radio.amateur.misc:85271 rec.radio.amateur.homebrew:9087 rec.radio.amateur.antenna:13168


I would like to purchase old test catalogs for my library.  I am interested in
catalogs and data sheets from the 50's through the mid 70's.  If you have any
H.P., Tektronix, General Radio, Wavetek, Boonton Radio, or similar catalogs
please contact George Carlson at Email [e-mail] or telephone
office-[phone], home-[phone]



From [e-mail] Mon Aug 21 18:13:27 1995
Newsgroups: rec.radio.amateur.homebrew
Path: grape.epix.net!news.sprintlink.net!gatech!wa4mei!ke4zv!gary
From: [e-mail] (Gary Coffman)
Subject: Re: Where can I find plans for a spark gap transmitter?
Message-ID: <[e-mail]>
Reply-To: [e-mail] (Gary Coffman)
Organization: Destructive Testing Systems
References: <4105og$[e-mail]> <410efh$[e-mail]> <410u0p$[e-mail]>
Date: Sat, 19 Aug 1995 14:37:30 GMT
Lines: 17

In article <410u0p$[e-mail]> Grant H Youngman <[e-mail]> writes:
>GOOD GRIEF GUYS!!! Is everyone on USenet a JERK??  If you don't have the
>plans he has been asking for then just shut up, hit the frigging delete
>key and move on to the next message.
>
>This is totally uncalled for, boorish, and JUST PLAIN RUDE.
>
>Grant/NQ5T

Yes, you are.

Gary
--
Gary Coffman KE4ZV          |    You make it,     | gatech!wa4mei!ke4zv!gary
Destructive Testing Systems |    we break it.     | emory!kd4nc!ke4zv!gary
534 Shannon Way             |    Guaranteed!      | [e-mail]
Lawrenceville, GA 30244     |                     |


From [e-mail] Mon Aug 21 18:13:28 1995
Path: grape.epix.net!news.sprintlink.net!news.azstarnet.com!usenet
From: Wes Stewart <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Where can I find plans for a spark gap transmitter?
Date: 18 Aug 1995 22:15:09 GMT
Organization: Arizona Daily Star - AZSTARNET
Lines: 31
Message-ID: <4133dd$[e-mail]>
References: <4105og$[e-mail]> <410efh$[e-mail]> <410u0p$[e-mail]>
NNTP-Posting-Host: sprite126.azstarnet.com
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Grant H Youngman <[e-mail]> wrote:
>Wes Stewart <[e-mail]> wrote:
>>[e-mail] (Einstein ) wrote:
[snip]

>GOOD GRIEF GUYS!!! Is everyone on USenet a JERK??

No, just some of you:)

> If you don't have the
>plans he has been asking for then just shut up, hit the frigging delete
>key and move on to the next message.
>
>This is totally uncalled for, boorish, and JUST PLAIN RUDE.

In your not so humble redundant opinion. (Are you a lawyer BTW?)

Perhaps this medium isn't the best way to offer what was intended to be constructive advice.
The point most of us (I think) were trying to make is that careless operation of this thing
could be a problem.  I obviously don't know George and HE certainly hasn't given me reason to
be insulting. If you read this group often, you will note many questions which are coming from
inexperienced individuals (not I said inexperienced, not stupid) who are attempting to do
something inappropriate.  Perhaps it's my "Elmer" nature of wanting to help, getting me in
trouble with you.  Frankly, it doesn't matter.

I really doubt that the intention was to use four foot diameter coils and operate in a Faraday
cage. When the man says "I know it's illegal but... I want to do it anyway", what does it say
to you? I was and am trying to dissuade George from radiating a signal with this device.

SK



From [e-mail] Mon Aug 21 18:13:29 1995
Path: grape.epix.net!news.sprintlink.net!news.bluesky.net!solaris.cc.vt.edu!mkeitz
From: [e-mail] (Mike Keitz)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Where can I find plans for a spark gap transmitter?
Date: Fri, 18 Aug 95 23:54:06 GMT
Organization: TSE Systems
Lines: 41
Message-ID: <413990$[e-mail]>
References: <4105og$[e-mail]>
NNTP-Posting-Host: mkeitz.beve.blacksburg.va.us
X-Newsreader: News Xpress Version 1.0 Beta #4

In article <4105og$[e-mail]>,
   [e-mail] (Einstein ) wrote:
>I looking for old plans for a spark gap transmitter.  If you have any
>I'd be happy to pay for copying them.
>
>PLEASE no flames!  I know that they are illegal to use.  This is for a
>science project and will not be used on amateur or commerical bands.
>
>George N7BUI
>
and then the readers of rec.radio.amateur.homebrew (with a few exceptions)
responded with a barrage of flames.  On first glance, three things about
the post suggest it is worthy of flaming:

* Use of a handle ("Einstein") rather than a real name.  However, on closer
inspection, a real (first) name and ham callsign are given.  N7BUI has been
issued to an Oregon resident named George.  It is of course hard to prove
that he is the actual writer of the post.

* Explanation that the intention was a "science project".  Many times this
is used to conceal actual intentions.  However, I would consider a spark
gap transmitter (unlike a "K3Wl BoMb") an interesting piece of scientific
history that would make a good science project.  Many sets of plans for the
various types of spark gap transmitters are likely to be old and of
historical interest as well.

* "I know they are illegal to use," but...  Come on guys, it is obvious
they are illegal to use.  It would most likely only be used for a brief
short-range (limited power, no antenna) demonstration, if at all.  If one
is even built.  A study of the various designs and an interpretive
presentation of the advances in this technology would be a credible science
project, without actually building a working transmitter.  If he wanted a
practical radio transmitter or jamming device, one using more modern
technology would be much more suitable.

Since I'm not familiar with spark transmitter technology (although I'm now
at least a little informed after reading Tom's and some of the other
responses), I can't directly answer George's request.  But I did want to
comment on the knee-jerk negative reactions I saw from many.

-Mike KD4QDM


From [e-mail] Mon Aug 21 18:13:30 1995
Path: grape.epix.net!news.sprintlink.net!gatech!newsfeed.pitt.edu!dbisna.com!psinntp!psinntp!psinntp!psinntp!interramp.com!usenet
From: Grant H Youngman <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Where can I find plans for a spark gap transmitter?
Date: 20 Aug 1995 14:18:54 GMT
Organization: PSI Public Usenet Link
Lines: 24
Message-ID: <417g8e$[e-mail]>
References: <4105og$[e-mail]> <410efh$[e-mail]> <410u0p$[e-mail]> <[e-mail]>
NNTP-Posting-Host: ip11.ft.worth.tx.interramp.com
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 1.2b5 (Windows; I; 16bit)
To: [e-mail]

[e-mail] (Gary Coffman) wrote:
>In article <410u0p$[e-mail]> Grant H Youngman <[e-mail]> writes:
>>GOOD GRIEF GUYS!!! Is everyone on USenet a JERK??  If you don't have the
>>plans he has been asking for then just shut up, hit the frigging delete
>>key and move on to the next message.
>>
>>This is totally uncalled for, boorish, and JUST PLAIN RUDE.
>>
>>Grant/NQ5T
>
>Yes, you are.
>
>

I'm just doing my gol' darndest to keep up with everyone else around
here......  It someone else can be rude, well, I'll show 'em -- I can be
as rude as the next guy.



Grant/NQ5T

Enough, already



From [e-mail] Mon Aug 21 18:13:30 1995
Path: grape.epix.net!news.sprintlink.net!in1.uu.net!psinntp!psinntp!psinntp!psinntp!interramp.com!usenet
From: Grant H Youngman <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Where can I find plans for a spark gap transmitter?
Date: 20 Aug 1995 14:10:04 GMT
Organization: PSI Public Usenet Link
Lines: 49
Message-ID: <417fns$[e-mail]>
References: <4105og$[e-mail]> <410efh$[e-mail]> <410u0p$[e-mail]> <4133dd$[e-mail]>
NNTP-Posting-Host: ip11.ft.worth.tx.interramp.com
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 1.2b5 (Windows; I; 16bit)
To: [e-mail]

Wes Stewart <[e-mail]> wrote:
>
>No, just some of you:)
>
>> If you don't have the
>>plans he has been asking for then just shut up, hit the frigging delete
>>key and move on to the next message.
>>
>>This is totally uncalled for, boorish, and JUST PLAIN RUDE.
>
>In your not so humble redundant opinion. (Are you a lawyer BTW?)
>


Actually, I DO read the groups quite often.  My inflamatory response was
directed at ALL of the "gee you sure are stupid for asking that kind of
question" responses, not just the poor sole that finally drove me over
the edge of inFLAMity :-)  So it wasn't personal though I'm sure it
seemed that way.

I see a fellow ask a perfectly innocent question, and the first 10
responses imply he needs a new science project.  These responses all have
the flavor of the parent chiding the uneducated child for being about to
stick his finger in the flaming gas burner.

No one seems to make the presumption that the gentleman knows what he is
doing, understands the law, and then proceeds to answer his question or
at least enter in to an interesting discussion on building spark
transmitters.

This kind of behaviour is common here on the newsgroups.  But my original
statement prevails -- it IS RUDE.  And its unnecessary.  One could
certainly say the same thing about my post -- but, this was the third
thread I had read today which consisted of the same kind of responses and
I quite simply lost my cool.  Which is no excuse, but some explanation.

I personally get tired of reading the stuff -- since it costs me money
to access these newsgroups.  The net has become overcrowded with folks
who seem to take great delight in pointing out the flaws in what someone
has said.  Fortunately, one occasionally finds something of value amongst
the chaff - and there have even been some posts on spark gap references.

Peace ....

Grant/NQ5T






From [e-mail] Mon Aug 21 18:13:31 1995
Path: grape.epix.net!news.sprintlink.net!howland.reston.ans.net!tank.news.pipex.net!pipex!dispatch.news.demon.net!demon!pinetree
From: [e-mail] (WB3U)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Where can I find plans for a spark gap transmitter?
Date: Mon, 21 Aug 95 07:32:22 GMT
Lines: 9
Message-ID: <[e-mail]>
References: <4105og$[e-mail]> <410efh$[e-mail]> <410u0p$[e-mail]> <[e-mail]> <417g8e$[e-mail]>
NNTP-Posting-Host: pinetree.microserve.com
X-NNTP-Posting-Host: pinetree.microserve.com
X-Newsreader: News Xpress Version 1.0 Beta #4

Sheesh.  One question about a science project and everyone thinks
they're his mother.

Good thing he wasn't asking how to build an electric chair.

73,

Jack  WB3U


From [e-mail] Mon Aug 21 18:13:32 1995
Path: grape.epix.net!news.sprintlink.net!howland.reston.ans.net!ix.netcom.com!netnews
From: [e-mail] (Einstein )
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Where can I find plans for a spark gap transmitter? Good Grief!
Date: 21 Aug 1995 05:37:02 GMT
Organization: Netcom
Lines: 11
Distribution: world
Message-ID: <41961u$[e-mail]>
References: <4105og$[e-mail]> <410efh$[e-mail]> <410u0p$[e-mail]> <4133dd$[e-mail]> <417fns$[e-mail]>
NNTP-Posting-Host: ix-eug-or1-24.ix.netcom.com

This was seriously not intended for flame bait.  The device was going
to used into a dummy load of some type AND be low power!
An all band reciever would demonstrate the width of a spark signal.

My thanks to the many who responded!  Flamers, what can I say but
surely you must have better things to do with your time.

George Worthington
N7BUI (Eugene, OR)




From [e-mail] Mon Aug 21 18:13:32 1995
Path: grape.epix.net!news.sprintlink.net!howland.reston.ans.net!newsjunkie.ans.net!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail
From: [e-mail] (PTracy)
Newsgroups: rec.radio.amateur.homebrew
Subject: Who had problem with MRF141G?
Date: 20 Aug 1995 13:22:54 -0400
Organization: America Online, Inc. (1-800-827-6364)
Lines: 3
Sender: [e-mail]
Message-ID: <417r1e$[e-mail]>
References: <40vcua$[e-mail]>
NNTP-Posting-Host: newsbf02.mail.aol.com
X-Newsreader: AOL Offline Reader

Are you still here?  I possibly have some hints that could be helpful.

Pat, KE1C


From [e-mail] Mon Aug 21 18:13:33 1995
Path: grape.epix.net!news.sprintlink.net!in2.uu.net!prodigy.com!usenet
From: [e-mail] (James Cullen iv)
Newsgroups: rec.radio.amateur.homebrew
Subject: World Record Attempt, High Power Rockets
Date: 19 Aug 1995 23:44:40 GMT
Organization: Prodigy Services Company  1-800-PRODIGY
Lines: 42
Distribution: world
Message-ID: <415t18$[e-mail]>
NNTP-Posting-Host: inugap4.news.prodigy.com
X-Newsreader: Version 1.2

Help!

The Las Vegas chapter of Tripoli -- the national association of high
power rocket enthusiasts -- is preparing to challange the world altitude
record for high power rockets -- currently about 37,000 feet.  We need
help locating plans or a schematic for a tracking transmitter, antenna
and receiver for the record attempt.  Here's what we need:

The transmitter must be able to fit into a tube that is 1-1/2" in
diameter and no longer than 12 inches.  It must operate for a minimum of
one hour on batteries and be as light as possible.  The operating
frequency is not important as long as it is in the amateur bands.  We
need a minimum range of about 15 miles line of sight.  The body of the
rocket is constructed from phenolic-impregnated Kraft paper overwrapped
with fiberglass.  An antenna can be glued to the outside of the rocket
body -- perhaps copper foil tape or some similar method.  Radiation
pattern from the transmitter should be omnidirectional, because we have
no idea as to the position in which the rocket will land.

The receiver can be just about anything that we can carry, as long as it
is battery operated.  The receiving antenna should be highly directional
and hand held.

If you have any suggestions on how I can obtain or construct a
transmitter/receiver combination that will accomplish this task, please e-
mail me at

UYFA59A@ Prodigy.Com

If you have any interest in being a part of this, let me know also.  The
attempt will be made in about 6 months, most likely in the Black Rock
Desert of northern Nevada -- about 80 miles NNE of Reno.

Thanks very much for your assistance.

Jim Cullen, KA7RAF
9456 Mast Drive
Las Vegas, NV  89117-0286
[phone]





From [e-mail] Sun Aug 27 17:28:36 1995
Path: grape.epix.net!news.sprintlink.net!howland.reston.ans.net!newsjunkie.ans.net!Rezonet.net!altitude!usenet
From: ROMAR <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: (+) Plans/schemes for radio -- where to be found ?
Date: 24 Aug 1995 23:33:25 GMT
Organization: Communications Accessibles Montreal, Quebec Canada
Lines: 5
Message-ID: <41j285$[e-mail]>
References: <41j1r4$[e-mail]>
NNTP-Posting-Host: romar.hip.cam.org
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 1.1N (Windows; I; 16bit)

BTW, I forgot: reply me throug E-mail, please, at
[e-mail] (I'll leave cam.org)

Thanks.



From [e-mail] Sun Aug 27 17:28:37 1995
Path: grape.epix.net!news.sprintlink.net!newsfeed.internetmci.com!news.msfc.nasa.gov!pendragon.jsc.nasa.gov!ames!titan.ksc.nasa.gov!kscdl1.cad.ksc.nasa.gov!k4dii.ksc.nasa.gov!user
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: 20M/40M mobile antenna problem/question
Message-ID: <[e-mail]>
From: [e-mail] (Fred McKenzie)
Date: Fri, 25 Aug 1995 14:26:41 -0400
References: <41d6pj$[e-mail]>
Organization: NASA, Kennedy Space Center, Florida
Nntp-Posting-Host: k4dii.ksc.nasa.gov
Lines: 21

In article <41d6pj$[e-mail]>, Jeff Krul <[e-mail]> wrote:
> I have a 20M/40Meter mobile vertical which was GIVEN to me by
> the owner of the HF rig I purchased. (450sat).  I constructed
> a 'mobile' stand for the antenna out of plywood for DX
> expeditions away from home.  The base of the mobile antenna
> sits about 10feet off the ground when on the stand.

Jeff-

The obvious trouble is that you only put up half of the antenna!
Normally, the vehicle is part of a mobile antenna system, even though it
may be small compared to the wavelength involved.  You can't get along
without it, or some equivalent ground plane.

It is also possible to mount a pair of HF mobile antennas on a bracket, to
form a shortened dipole.  This won't work as well as a full size antenna,
but is relatively portable.  I purchased such a bracket from the company
that sells the "Hamstick" mobile antennas.  They had a table set up at one
of the local hamfests.  I haven't had a chance to try it yet.

73, Fred, K4DII


From [e-mail] Sun Aug 27 17:28:38 1995
Path: grape.epix.net!news.sprintlink.net!malgudi.oar.net!news.erinet.com!bug.rahul.net!a2i!kaiwan.kaiwan.com!ledge!bob.albert
From: [e-mail] (BOB ALBERT)
Newsgroups: rec.radio.amateur.homebrew
Subject: Amp. parts for sale
Message-ID: <[e-mail]>
Date: Sat, 26 Aug 95 16:21:00 -0800
Distribution: world
Organization: The Ledge PCBoard: Lake View Terrace, CA: USA: 818-896-2007
Reply-To: [e-mail] (BOB ALBERT)
X-Newsreader: PCBoard Version 15.21
X-Mailer: PCBoard/UUOUT Version 1.10
Lines: 11

I have parts to build some HF kilowatt amplifiers.  Tubes, transformers,
etc.  And a couple of working amplifiers.  Not asking a lot, but would
prefer pickup in the Los Angeles area.

I also have an oscilloscope, Tektronix 535 for sale or parts.  And an
old Dumont 401-R oscilloscope for parts.

All this stuff works but I think I'll just part them out and probably
get the same amount of money either way.

Call me at 818-894-2887 after 10AM Pacific time.  73 DE K6DDX


From [e-mail] Sun Aug 27 17:28:38 1995
Path: grape.epix.net!news.sprintlink.net!howland.reston.ans.net!news-e1a.megaweb.com!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail
From: [e-mail] (JCHol)
Newsgroups: rec.radio.amateur.homebrew
Subject: Building amplifier - need load capacitor
Date: 24 Aug 1995 20:38:24 -0400
Organization: America Online, Inc. (1-800-827-6364)
Lines: 5
Sender: [e-mail]
Message-ID: <41j620$[e-mail]>
Reply-To: [e-mail] (JCHol)
NNTP-Posting-Host: newsbf02.mail.aol.com

Please let me know if you have a 1.5kv air variable capacitor in the range
of about 1000 picofarads.  Possibly I could use a smaller one.  It is for
the plate tank circuit for an amplifier with two 3-500z tubes.

Thanks for reading.  73 de John, WA5TWL....


From [e-mail] Sun Aug 27 17:28:39 1995
Path: grape.epix.net!news.sprintlink.net!newsfeed.internetmci.com!usenet.eel.ufl.edu!col.hp.com!jms
From: [e-mail] (Mike Stansberry)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Building amplifier - need load capacitor
Date: 25 Aug 1995 12:40:27 GMT
Organization: HP Colorado Springs Division
Lines: 9
Message-ID: <41kgbr$[e-mail]>
References: <41j620$[e-mail]>
NNTP-Posting-Host: mssjms.col.hp.com
X-Newsreader: TIN [version 1.2 PL2]

JCHol ([e-mail]) wrote:
: Please let me know if you have a 1.5kv air variable capacitor in the range
: of about 1000 picofarads.  Possibly I could use a smaller one.  It is for
: the plate tank circuit for an amplifier with two 3-500z tubes.

Yes, you could use a smaller one.  Try around 200-250 pF.

Mike, K0TER



From [e-mail] Sun Aug 27 17:28:40 1995
Path: grape.epix.net!news.sprintlink.net!newsfeed.internetmci.com!howland.reston.ans.net!news-e1a.megaweb.com!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail
From: [e-mail] (W8JI  Tom)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Building amplifier - need load capacitor
Date: 25 Aug 1995 10:23:41 -0400
Organization: America Online, Inc. (1-800-827-6364)
Lines: 19
Sender: [e-mail]
Message-ID: <41kmdd$[e-mail]>
References: <41kgbr$[e-mail]>
Reply-To: [e-mail] (W8JI  Tom)
NNTP-Posting-Host: newsbf02.mail.aol.com

: Please let me know if you have a 1.5kv air variable capacitor in the
range
: of about 1000 picofarads.  Possibly I could use a smaller one.  It is
for
: the plate tank circuit for an amplifier with two 3-500z tubes.

>Yes, you could use a smaller one.  Try around 200-250 pF.

What? Only if he wants to stay on six meters or have a mess off switched
padders. The 1000 won't even hit 160. I can't run the numbers but if uses
the 3-500Z's at anywhere near rating the 1000 won't even hit 80 without a
padder.

Try to contact the manufacturers of amps to buy a cap. Ameritron, Ten-tec,
etc.
They buy them in bulk, and replacement parts are usually cheaper than
surplus sales. I also have a ton of caps like that if you get stuck.

73 Tom


From [e-mail] Sun Aug 27 17:28:40 1995
Path: grape.epix.net!news.sprintlink.net!howland.reston.ans.net!newsjunkie.ans.net!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail
From: [e-mail] (W8JI  Tom)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Building amplifier - need load capacitor
Date: 26 Aug 1995 11:08:32 -0400
Organization: America Online, Inc. (1-800-827-6364)
Lines: 6
Sender: [e-mail]
Message-ID: <41nddg$[e-mail]>
References: <41kmdd$[e-mail]>
Reply-To: [e-mail] (W8JI  Tom)
NNTP-Posting-Host: newsbf02.mail.aol.com

Ohhh, wait a minute. I see why he said 250 pF (although that still won't
hit 160).
I think you post wasn't clear as to where you wereusing the cap. I assumed
it was the load control, because of the low voltage and high capacitance
you specified. I bet the other guy assumed it was the plate tuning cap! 73
Tom


From [e-mail] Sun Aug 27 17:28:41 1995
Path: grape.epix.net!news.sprintlink.net!newsfeed.internetmci.com!howland.reston.ans.net!newsjunkie.ans.net!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail
From: [e-mail] (JCHol)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Building amplifier - need load capacitor
Date: 26 Aug 1995 17:39:12 -0400
Organization: America Online, Inc. (1-800-827-6364)
Lines: 2
Sender: [e-mail]
Message-ID: <41o4a0$[e-mail]>
References: <41nddg$[e-mail]>
Reply-To: [e-mail] (JCHol)
NNTP-Posting-Host: newsbf02.mail.aol.com

I agree with you, Tom.  He must have figured it was the tune capacitor.  I
am planning on switching in some doorknobs to make up the difference.


From [e-mail] Sun Aug 27 17:28:42 1995
Path: grape.epix.net!news.sprintlink.net!parsifal.nando.net!usenet
From: [e-mail] (Doug Hall)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Computer Interferance using RTTY
Date: Fri, 25 Aug 1995 02:13:56 GMT
Organization: JPS Communications, Inc.
Lines: 28
Message-ID: <41jbja$[e-mail]>
References: <41iuut$[e-mail]>
Reply-To: [e-mail]
NNTP-Posting-Host: vyger804.nando.net
X-Newsreader: Forte Free Agent v0.46

[e-mail] (Jon Knutson) wrote:

>This message isn't truly related  to homebrewing but I thought you guys
>might have the best idea as to what I should try here.


>I have been trying to get into RTTY lately but am having a heck of a time
>with my computer locking up when using 20 or 40 meters.  It's ok on 10
>and 15.  I have the cpu unit grounded have coils on the cables going into
>the CPU but it really hasn't even made a differance.  Any help on what to
>try next would be greatly appreciated.

>Thanks, KA0JZX
>Jon Knutson

Jon,

You say you have coils on the cables - I assume you're talking about
the serial cable from the RTTY unit and the audio lines. But what
about the keyboard cable on your computer? My experience has been that
keyboards vary in their susceptability to RF - some are immune to it
and others roll over and die when you crank up the power. If you can
borrow another keyboard to try, do it. You might find the problem
there.
73,
Doug, KF4KL




From [e-mail] Sun Aug 27 17:28:42 1995
Newsgroups: rec.radio.amateur.homebrew
Path: grape.epix.net!news.sprintlink.net!howland.reston.ans.net!agate!darkstar.UCSC.EDU!news.scruz.net!cruzio!davew
From: [e-mail]
Subject: Re: Computer Interferance using RTTY
Reply-To: [e-mail]
Organization: Cruzio Community Networking System, Santa Cruz, CA
Date: Sat, 26 Aug 1995 23:25:36 GMT
Message-ID: <[e-mail]>
References: <41iuut$[e-mail]> <41jbja$[e-mail]>
Sender: [e-mail] (David Wells)
Lines: 25

In article <41jbja$[e-mail]>, [e-mail] (Doug Hall) writes:
> [e-mail] (Jon Knutson) wrote:
>
> >I have been trying to get into RTTY lately but am having a heck of a time
> >with my computer locking up when using 20 or 40 meters.  It's ok on 10
> >and 15.  I have the cpu unit grounded have coils on the cables going into
> >the CPU but it really hasn't even made a differance.  Any help on what to
> >try next would be greatly appreciated.
>
> >Thanks, KA0JZX
> >Jon Knutson
>
Jon,
You may also want to ground the keyboard with a seperate ground braid. I
opened mine and attached a braid made from the shield off a piece of RG58 to
the ground plane in the keyboard, then ran it back to the PC case and then to
the station ground. I run 1kw on all bands with no problem.
Dave KD6TO
.

--
Dave Wells KD6TO; INTERNET: [e-mail]
Packet:KD6TO@K6LY.#CENCAL.CA.USA.NOAM;  COMPUSERVE:74067,1755
(WA4UQQ Worldwide Amateur Radio Directory III KD6TO)
.


From [e-mail] Sun Aug 27 17:28:43 1995
Path: grape.epix.net!news.sprintlink.net!in1.uu.net!tank.news.pipex.net!pipex!dispatch.news.demon.net!demon!mail2news.demon.co.uk!lfheller.demon.co.uk!Leon
From: Leon Heller <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Divide by ten front end for frequency counter
Date: Thu, 24 Aug 95 17:46:42 GMT
Organization: Home
Lines: 28
Message-ID: <[e-mail]>
References: <40rleh$[e-mail]> <40st8u$[e-mail]> <[e-mail]> <415gsd$[e-mail]> <[e-mail]> <[e-mail]> <[e-mail]>
Reply-To: [e-mail]
X-NNTP-Posting-Host: lfheller.demon.co.uk
X-Newsreader: Demon Internet Simple News v1.29

In article <[e-mail]>
           [e-mail] "Jon Goguen" writes:

> In article <[e-mail]>, [e-mail] wrote:>
>
> > GEC-Plessey make 3 GHz dividers. I've got their catalogue somewhere if
> > you want more details.
> >
> Leon:
>
> Do you know of any source for these dividers in small quantities?

They are rather specialised, so you might have problems in the US. The
GEC Plessey N. American national sales office phone number is (408)
438-2900. They should be able to give you details of your nearest
distributor. Pioneer Standard and Insight stock GPS products, and seem
to have offices in most states.

A typical component is the SP8904B that goes up to 7000 MHz! They make
slower devices like the 3500 MHz SP8835B. 8-) These are both divide by
4s.

Leon
--
Leon Heller, G1HSM                | "Do not adjust your mind, there is
E-mail [e-mail]  |  a fault in reality": on a wall
Phone: [phone]         |  many years ago in Oxford.


From [e-mail] Sun Aug 27 17:28:44 1995
Path: grape.epix.net!news.sprintlink.net!newsfeed.internetmci.com!news.msfc.nasa.gov!pendragon.jsc.nasa.gov!ames!titan.ksc.nasa.gov!kscdl1.cad.ksc.nasa.gov!k4dii.ksc.nasa.gov!user
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Divide by ten front end for frequency counter
Message-ID: <[e-mail]>
From: [e-mail] (Fred McKenzie)
Date: Fri, 25 Aug 1995 14:41:43 -0400
References: <40rleh$[e-mail]> <40st8u$[e-mail]>
 <[e-mail]> <415gsd$[e-mail]> <[e-mail]>
Organization: NASA, Kennedy Space Center, Florida
Nntp-Posting-Host: k4dii.ksc.nasa.gov
Lines: 20

In article <[e-mail]>, [e-mail]
(Jon Goguen) wrote:
> How do you make the divide by four that operates to 3 GHz?  I was under
> the impression that some sort of frequency conversion scheme was used to
> bring high frequencies down prior to the dividers and counters, but direct
> division would certainly be a lot easier.

Jon-

Division is easier, but requires longer to measure to the same accuracy.
If you measure to one Hz with a one second time base and divide by 10,
your new measurement will only be to ten Hz.

Some counters, such as the Optoelectronics, use divide by 2 and divide by
4 prescalers for higher frequency measurements.  Their circuitry
automatically lengthens the timebase to match, so you end up with the same
resolution at 2 or 4 times the original timebase, without having to do any
math yourself.

73, Fred, K4DII


From [e-mail] Sun Aug 27 17:28:45 1995
Path: grape.epix.net!news.sprintlink.net!ddi2.digital.net!usenet
From: [e-mail] (Russ Leblanc)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Drake R7  VCO hosed: stuck at 51.950 MHz
Date: 25 Aug 1995 10:10:53 GMT
Organization: Hurricane DX Club
Lines: 18
Message-ID: <41k7jd$[e-mail]>
References: <41e6pq$[e-mail]>
NNTP-Posting-Host: @204.215.242.151
X-Newsreader: WinVN 0.90.4

In article <41e6pq$[e-mail]>, russ ([e-mail]) says:
>
>I have an R7 with the digital readout installed that worked and then
>froze on the above frequency on the display.  I think I've narrowed
>it down to the VCO board, probably the MC14046 PLL or one the the
>following UA739 opamps stuck on the positive rail, which might account
>for the failure mode.
>


Never mind, found the problem.

Still, I welcome other comments from R7 users on fixes, mods, etc.

Especially on how to change the #53 bulb on the tuning window without
destroying the front panel <g>.

Russ


From [e-mail] Sun Aug 27 17:28:46 1995
Path: grape.epix.net!news.sprintlink.net!nntpgate.primenet.com!nntpdist.primenet.com!usenet
From: Phil Diaz <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: gizmachi antenna
Date: 25 Aug 1995 08:03:34 GMT
Organization: Primenet
Lines: 3
Message-ID: <41k04m$[e-mail]>
NNTP-Posting-Host: ip198.prc.primenet.com
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 1.1N (Windows; I; 16bit)
To: radio.amateur.homebrew

can anyone tell me how to build one? has anyone ever heard of a gizmachi
antenna? i saw one very unique antenna and works very well...i'm told.



From [e-mail] Sun Aug 27 17:28:46 1995
Path: grape.epix.net!news.sprintlink.net!nntpgate.primenet.com!nntpdist.primenet.com!usenet
From: Phil Diaz <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: gizmachi antenna
Date: 25 Aug 1995 08:04:21 GMT
Organization: Primenet
Lines: 3
Message-ID: <41k065$[e-mail]>
NNTP-Posting-Host: ip198.prc.primenet.com
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 1.1N (Windows; I; 16bit)
To: [e-mail]

can anyone tell me how to build one? has anyone ever heard of a gizmachi
antenna? i saw one very unique antenna and works very well...i'm told.



From [e-mail] Sun Aug 27 17:28:47 1995
Path: grape.epix.net!news.sprintlink.net!ddi2.digital.net!usenet
From: "Davd L. Frey" <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Help: Looking for info on Cascade Electronics
Date: 26 Aug 1995 03:50:21 GMT
Organization: FLORIDA ONLINE, Florida's Premier Internet Provider
Lines: 8
Message-ID: <41m5lt$[e-mail]>
NNTP-Posting-Host: @pm4_14.digital.net

I need the telephone number and address of a company called Cascade Electronics.
They supply hardware for the electronic industry.

Thank you,

Dave Frey
email: [e-mail]



From [e-mail] Sun Aug 27 17:28:47 1995
Path: grape.epix.net!news.sprintlink.net!in2.uu.net!cadvision.com!usenet
From: John Fallows <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: HF Propagation Software
Date: 26 Aug 1995 22:09:38 GMT
Organization: CADVision
Lines: 5
Message-ID: <41o632$[e-mail]>
NNTP-Posting-Host: cad148.cadvision.com

I am interested in communicating with anyone who experiments
with or uses HF propagation evaluation software and theory.
In particular, I am looking for some theory or algorithms
on using A/K indices to adjust MUF calculations during
ionospheric storms, etc.


From [e-mail] Sun Aug 27 17:28:48 1995
Path: grape.epix.net!news.sprintlink.net!tank.news.pipex.net!pipex!swrinde!gatech!ncar!noao!math.arizona.edu!news.Arizona.EDU!usenet
From: Kendel McCarley <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: How do I make thru-plated holes?
Date: Thu, 24 Aug 1995 10:12:17 -0700 (MST)
Organization: The University of Arizona
Lines: 27
Message-ID: <[e-mail]>
References: <[e-mail]>  <41gk0d$[e-mail]> <[e-mail]>
NNTP-Posting-Host: stat.nursing.arizona.edu
Mime-Version: 1.0
Content-Type: TEXT/PLAIN; charset=US-ASCII
In-Reply-To: <[e-mail]>


>
> > >I need to make a double layer board.  I've done it before with rather
> > >cheesy connections between the layers, but need to do a better job this
> > >time or I won't be able to get to my solder connections.
> >
> > >Anyhow, I've looked at tining kits, but still don't have a clue as to how
> > >I make a thru plated hole.
> >
> >     It can be done.  But you would be way ahead of the game if you simply
> > paid the 2 or 3 hundred dollars necessary to get a commercial outfit
> > to make a board for you.
> >
>
I've never been able to get this cheap for boards I've had made for work
related projects.  I'm paying a little over two-hundred dollars in setup
charges alone on a current project (photoplots, etc.) and I have shopped
around.

Anyhow, I'd still like to know how to make thru-plated holes.  I can't
justify several hundred dollars for a single, hobby-related board;
especially when I could go out and buy a commercial product for about
that much to do what I'm homebrewing.

Kendel McCarley                                   [e-mail]
KC7FRS                            http://www.nursing.arizona.edu/~kendelm



From [e-mail] Sun Aug 27 17:28:49 1995
Path: grape.epix.net!news.sprintlink.net!itsmail1.hamilton.edu!NewsWatcher!user
From: [e-mail] (Brian Collett)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: How do I make thru-plated holes?
Date: Thu, 24 Aug 1995 16:44:02 -0500
Organization: Hamilton College - Clinton, NY 13323 (USA)
Lines: 21
Message-ID: <bcollett-2408951644020001@150.209.16.9>
References: <[e-mail]> <41gk0d$[e-mail]> <[e-mail]>  <41i50r$[e-mail]> <[e-mail]>
NNTP-Posting-Host: 150.209.16.9

In article <[e-mail]>,
[e-mail] wrote:

> In Article<41i50r$[e-mail]>, <[e-mail]> write:
> > Path:
esol.intermedia.com!newsjunkie.ans.net!howland.reston.ans.net!plug.news.pipex.net!pipex!tank.news.pipex.net!pipex!news.sprintlink.net!news.azstarnet.com!u
<deleted>
> > >I belive thay have a
> > >website, www.apcircuits.com/htmls/apc/apdel2.html
> > >
> > >
> > I couldn't connect to this site:-(
> >
> > Wes -- N7WS
> >
> A little typo on the website
> it should be www.apcircuits.com/htmls/apc/apdef2.html

I tried that and couldn't get the doc so I searched and found it at
http://www.cadvision.com/htmls/apc/apdef2.html
.


From [e-mail] Sun Aug 27 17:28:51 1995
Path: grape.epix.net!news.sprintlink.net!newsfeed.internetmci.com!news.msfc.nasa.gov!bcm!convex!cnn.exu.ericsson.se!news
From: [e-mail] (Mike Groves)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: How do I make thru-plated holes?
Date: Fri, 25 Aug 1995 14:55:10 GMT
Organization: Ericsson North America, Inc.
Lines: 72
Message-ID: <41ko2m$[e-mail]>
References: <[e-mail]>  <41gk0d$[e-mail]> <[e-mail]> <[e-mail]>
NNTP-Posting-Host: pc125011.exu.ericsson.se
X-Newsreader: Forte Free Agent 1.0.82

Kendel McCarley <[e-mail]> wrote:


>> >    It can be done.  But you would be way ahead of the game if you simply
>> > paid the 2 or 3 hundred dollars necessary to get a commercial outfit
>> > to make a board for you.
>> >
>>
>I've never been able to get this cheap for boards I've had made for work
>related projects.  I'm paying a little over two-hundred dollars in setup
>charges alone on a current project (photoplots, etc.) and I have shopped
>around.

>Anyhow, I'd still like to know how to make thru-plated holes.  I can't
>justify several hundred dollars for a single, hobby-related board;
>especially when I could go out and buy a commercial product for about
>that much to do what I'm homebrewing.

And right you are.  Some of the postings have been a little silly for
a "HOMEBREW" newsgroup.

Kendal, I design RF transistors and so as a rule I HAVE to make
breadboard PCB's *fast* to test new designs.  No time for outside
services.  I use one of those engraving machines to "etch" the PC
board, but I'm still left with no through holes which makes for very
poor RF grounding.  Here are a few things I do:

1. Copper or brass shim.  You can get it in real thin sheets (around
003"-.008" thick is best), and sometimes in rolls for bigger jobs.
Cut a thin strip (1/16" works fine) to about a .25" length and feed it
through either a pre-drilled hole, or a slit made through the board
with an exacto knife.  I use a small hole for FR-4 (your most common
PCB material), and a slit for the more expensive (and softer)
Teflon-Fiberglass material used in microwave applications.  Now bend
the "tabs" sticking out down flat on the board and solder both sides.
They can be bent down in either a "Z" shape, or fold the top tab back
over in the direction of the bottom tab to make a "U" shape.  If
you're clever, you can even make a 90 degree bend by folding it as it
comes up through the hole.  You can connect traces top and bottom by
using combinations of the above.

2. Brass eyeletts.  A little harder to find, but work great.  You buy
them according to the thickness of your PCB.  They come a little
longer than the board is thick.  You put several at a time into
pre-drilled holes, and place the PCB on a hard, flat surface.  (At
this point you are supposed to use a special tool, but the following
technique work fine.)  Hit the top of the eyelett lightly with a
center punch to flair it out, then flatten it down to the PCB with a
small hammer.  A little solder top and bottom and you're all set.

3. A REAL inexpensive way is to use solid copper wire as a "plug" for
a hole.  Drill a hole exactly the same diameter as the wire you are
using.  Now you can feed a short length through the hole.  Place your
PCB on a hard surface and trim the wire using good "flush cutting"
wire cutters a little bit above the PCB surface.  You'll have to
experiment with the length.  Then hit the top of the wire with a small
hammer.  It will mushroom out slightly pinning it in the hole.  Solder
it in place and you're done.

There are easier methods, but one of the criteria I have to use is the
bottom surface of my PCB end up as flat as possible to mount it flat
on a heat sink.  Otherwise you could simply run a wire from top to
bottom through a hole and be done with it.  Whatever works for your
application.

I use the above methods to build prototype RF boards that perform well
past 2 GHz.  These ideas are NOT mine, I just use them.  Good luck
with your project!  Other helpful comments by hams are encouraged
here.

Mike Groves (KD6PKJ)



From [e-mail] Sun Aug 27 17:28:52 1995
Path: grape.epix.net!news.sprintlink.net!tank.news.pipex.net!pipex!newsfeed.internetmci.com!news.msfc.nasa.gov!bcm!convex!cnn.exu.ericsson.se!news
From: [e-mail] (Frank Scaraglino)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: How do I make thru-plated holes?
Date: 25 Aug 1995 16:20:40 GMT
Organization: Ericsson North America Inc.
Lines: 8
Message-ID: <41kt8o$[e-mail]>
References: <41gk0d$[e-mail]>
Reply-To: [e-mail]
NNTP-Posting-Host: opus.rtp.ericsson.se

you can make "plated thru holes" by using eyelets! there is a kit called a TRACK REPAIR Kit made by PACE I think TECHNITOOL sells it. It comes with eyelet
Have fun

---
_______________________________________________________________________
Frank Scaraglino           [e-mail]       KA2FWC




From [e-mail] Sun Aug 27 17:28:52 1995
Path: grape.epix.net!news.sprintlink.net!in1.uu.net!bud.shadow.net!news
From: Eliot Fenton <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: How do I make thru-plated holes?
Date: 27 Aug 1995 00:56:38 GMT
Organization: ICS Inc.
Lines: 17
Message-ID: <41ofs6$[e-mail]>
References: <41gk0d$[e-mail]> <41kt8o$[e-mail]>
NNTP-Posting-Host: ppp-ftl2-23.shadow.net
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 1.2b6 (Windows; I; 16bit)

You can get eyelets from the following company:

International Eyelets Inc.
1240 Keystone Way
Vista CA 92083
Tel [phone]
Fax [phone]

I've been using eyelets with a center punch successfully in ckts. up to 4
GHz.  Eyelets will usually perform better than wires due to their lower
inductance.

--
Eliot Fenton
[e-mail]




From [e-mail] Sun Aug 27 17:28:53 1995
Path: grape.epix.net!news.sprintlink.net!newsfeed.internetmci.com!news.west.net!news.west.net!not-for-mail
From: [e-mail] (Edward Haas)
Newsgroups: rec.radio.amateur.homebrew,rec.crafts.metalworking
Subject: Re: How to Space-Wind Coils?
Followup-To: rec.radio.amateur.homebrew,rec.crafts.metalworking
Date: 24 Aug 1995 22:21:20 -0700
Organization: West.Net Communications
Lines: 14
Message-ID: <41jmkg$[e-mail]>
References: <[e-mail]> <[e-mail]> <[e-mail]>
NNTP-Posting-Host: acme.sb.west.net
X-Newsreader: TIN [version 1.2 PL2]
Xref: grape.epix.net rec.radio.amateur.homebrew:9152 rec.crafts.metalworking:15451


        I believe one technique of doing this is referred to as "bifilar
winding" and had to do with increasing the cross-sectional area of the
coil by winding, simultaneously, two wires, which needn't be of the same
diameter, one would suppose. I did just this, when I needed to wrap some
wire around a tubular structure that was too tight a bend for a  larger
cross-section wire. You might try something like this, just making sure
that the spacer-wire doesn't contact the wire that's carrying the current...
--
        "Steamboat Ed" Haas     :       Four a good time,
        phone:  [phone]  :       finger steamer|more
        FAX:    [phone]  :
                ---Decks a-wash in a sea of words---



From [e-mail] Sun Aug 27 17:28:53 1995
Path: grape.epix.net!news.sprintlink.net!tank.news.pipex.net!pipex!swrinde!ihnp4.ucsd.edu!news1.ucsd.edu!news-mail-gateway
From: [e-mail] (Joe Davis)
Newsgroups: rec.radio.amateur.homebrew
Subject: I want to subscribe to your mailing list
Date: 26 Aug 95 06:48:23 GMT
Organization: ucsd usenet gateway
Lines: 7
Message-ID: <[e-mail]>
NNTP-Posting-Host: ucsd.edu
Originator: [e-mail]

I would like to subscribe to your mailing list.  It is my goal to start buiildingg my own stuff.
Thank You

Joe W. Davis  N4EJF/7
 mail to [e-mail]




From [e-mail] Sun Aug 27 17:28:54 1995
Path: grape.epix.net!news.sprintlink.net!sunic!sunic.sunet.se!mn6.swip.net!seunet!mn3.swip.net!lertsbbs!sm7dlz
From: [e-mail] (Sm7dlz)
Newsgroups: rec.radio.amateur.homebrew
Subject: Info DX mailgroup
Date: Fri, 25 Aug 1995 09:10:00 GMT
Message-ID: <[e-mail]>
Organization: SpaceNet Online Sweden [phone]
Distribution: world
Lines: 10


Hi all!

Please help me with the right adress to the DX mailgroup. Have tried
several but I always get the msg "failed" in return.

73 de Hans  SM7DLZ

---
 * QMPro 1.51 * Chernobyl used Microsoft Windows.


From [e-mail] Sun Aug 27 17:28:55 1995
Path: grape.epix.net!news.sprintlink.net!europa.chnt.gtegsc.com!newsfeed.internetmci.com!btnet!dispatch.news.demon.net!demon!mail2news.demon.co.uk!lfheller.demon.co.uk!Leon
From: Leon Heller <[e-mail]>
Newsgroups: rec.radio.amateur.antenna,rec.radio.amateur.homebrew
Subject: Re: Jamming LW Radio
Date: Fri, 25 Aug 95 17:25:16 GMT
Organization: Home
Lines: 17
Message-ID: <[e-mail]>
References: <41kn0p$phu$[e-mail]>
Reply-To: [e-mail]
X-NNTP-Posting-Host: lfheller.demon.co.uk
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Xref: grape.epix.net rec.radio.amateur.antenna:13292 rec.radio.amateur.homebrew:9162

In article <41kn0p$phu$[e-mail]>
           [e-mail] "David Lees" writes:

> Anyone any idea how I could Jam a radio Long Wave radio station
> (Atlantic 252 to be accurate)............
>
> Please help if you can!

To start with, you'll need a big garden for the antenna! Plus lots of money
for the electricity bill. 8-)

Leon
--
Leon Heller, G1HSM                | "Do not adjust your mind, there is
E-mail [e-mail]  |  a fault in reality": on a wall
Phone: [phone]         |  many years ago in Oxford.


From [e-mail] Sun Aug 27 17:28:55 1995
Path: grape.epix.net!news.sprintlink.net!newsfeed.internetmci.com!news.compuserve.com!news.production.compuserve.com!news
From: David Lees <[e-mail]>
Newsgroups: rec.radio.amateur.antenna,rec.radio.amateur.homebrew
Subject: Jamming LW Radio
Date: 25 Aug 1995 14:34:01 GMT
Organization: none
Lines: 4
Message-ID: <41kn0p$phu$[e-mail]>
Xref: grape.epix.net rec.radio.amateur.antenna:13309 rec.radio.amateur.homebrew:9167

Anyone any idea how I could Jam a radio Long Wave radio station
(Atlantic 252 to be accurate)............

Please help if you can!


From [e-mail] Sun Aug 27 17:28:56 1995
Path: grape.epix.net!news.sprintlink.net!howland.reston.ans.net!vixen.cso.uiuc.edu!news.ksu.ksu.edu!hptemp1.cc.umr.edu!dstuart
From: [e-mail] (Dave Stuart ([e-mail]))
Newsgroups: rec.radio.amateur.antenna,rec.radio.amateur.homebrew
Subject: Re: Jamming LW Radio
Followup-To: rec.radio.amateur.antenna,rec.radio.amateur.homebrew
Date: 25 Aug 1995 20:11:59 GMT
Organization: UMR Missouri's Technological University
Lines: 16
Message-ID: <41laqf$[e-mail]>
References: <41kn0p$phu$[e-mail]>
NNTP-Posting-Host: rocket.cc.umr.edu
X-Newsreader: TIN [version 1.2 PL2]
Xref: grape.epix.net rec.radio.amateur.antenna:13321 rec.radio.amateur.homebrew:9176

David Lees ([e-mail]) wrote:
: Anyone any idea how I could Jam a radio Long Wave radio station
: (Atlantic 252 to be accurate)............

: Please help if you can!

Isn't that kind of un amatureish?


--
-- Dave Stuart
[e-mail]
University of Missouri -- Rolla

KB0SLY



From [e-mail] Sun Aug 27 17:28:56 1995
Path: grape.epix.net!news.sprintlink.net!newsfeed.internetmci.com!howland.reston.ans.net!torn!newshost.uwo.ca!irus.rri.uwo.ca!ppicot
From: [e-mail] (Paul Picot)
Newsgroups: rec.radio.amateur.antenna,rec.radio.amateur.homebrew
Subject: Re: Jamming LW Radio
Date: 25 Aug 1995 20:46:52 GMT
Organization: U.N.C.L.E.
Lines: 14
Message-ID: <41lcrs$[e-mail]>
References: <41kn0p$phu$[e-mail]>
NNTP-Posting-Host: oort.irus.rri.uwo.ca
Xref: grape.epix.net rec.radio.amateur.antenna:13322 rec.radio.amateur.homebrew:9177

In article <41kn0p$phu$[e-mail]> David Lees <[e-mail]> writes:
>Anyone any idea how I could Jam a radio Long Wave radio station
>(Atlantic 252 to be accurate)............

How about an air drop?  I was always quite fond of black currant myself.
It should stain the building nicely, but you'll need a 45-gallon drum
of it... :-)

But seriously: why would you want to interfere with a LW station?  It
is a navigation aid, isn't it?  The penalties for doing such a thing
should dissuade you.

But to give an answer: the most effective way to interfere with its
transmissions would be to drive a large truck into the transmitter


From [e-mail] Sun Aug 27 17:28:57 1995
Path: grape.epix.net!news.sprintlink.net!in2.uu.net!tcsi.tcs.com!agate!news.mindlink.net!news
From: [e-mail] (Andrew Taylor)
Newsgroups: rec.radio.amateur.homebrew
Subject: K Beep!
Date: 27 Aug 1995 00:17:14 GMT
Organization: MIND LINK! - British Columbia, Canada
Lines: 8
Message-ID: <41odia$[e-mail]>
NNTP-Posting-Host: line012.nwm.mindlink.net
Mime-Version: 1.0
Content-Type: Text/Plain; charset=ISO-8859-1
X-Newsreader: WinVN 0.99.5

Hello, Id like to build an "roger beep"....can't seem to find
any schematics anyplace.

Id appreciate it if you can help me out!
thanks
Andrew T
[e-mail]



From [e-mail] Sun Aug 27 17:28:58 1995
Newsgroups: rec.radio.amateur.homebrew
Path: grape.epix.net!news.sprintlink.net!howland.reston.ans.net!spool.mu.edu!torn!nott!cunews!freenet.carleton.ca!FreeNet.Carleton.CA!ao974
From: [e-mail] (Dave Scobie)
Subject: Re: Laser printer --> Panel, how?
Message-ID: <[e-mail]>
Sender: [e-mail] (Dave Scobie)
Reply-To: [e-mail] (Dave Scobie)
Organization: The National Capital FreeN
References:  <41d6o1$[e-mail]>
Date: Fri, 25 Aug 1995 05:44:50 GMT
Lines: 18


Snip ..... Toner is usually a composite of styrene and carbon perhaps with
some tint. Normally sepia,cyan, magenta, yellow and black. There are other
combinations ...... The styrene is melts or dissolved, applied to the
copy(transfer) and fixed by heat, pressure or evaporation.The liquid
toners often lack viscosity. In order to create the amount of solid fill
necessary to create a decent transfer, you need powder.

The lacquer merely melts a layer of toner off the transfer and causes it to
stick to the destination material, When the solvent evaporates, it is set.
Try not to smear it.
Good luck
73 de VA3AE


--
Across time and culture, few have had the exquisite pleasure of a
fresh piece of paper and a new box of crayolas.


From [e-mail] Sun Aug 27 17:28:59 1995
Path: grape.epix.net!news.sprintlink.net!sunic!sunic.sunet.se!seunet!news2.swip.net!news.algonet.se!usenet
From: [e-mail] (Christer Johansson)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Laser printer --> Panel, how?
Date: Fri, 25 Aug 1995 19:08:20 GMT
Organization: HTH
Lines: 28
Message-ID: <41l773$[e-mail]>
References: <41d6o1$[e-mail]> <41dcct$[e-mail]>
Reply-To: [e-mail]
NNTP-Posting-Host: sophocles.algonet.se
X-Newsreader: Forte Free Agent 1.0.82

[e-mail] (Greg Brush) wrote:

>: Maybe this is old news and I just didn't get the word, but I'm
>: wondering how I can transfer laser-printed artwork onto a panel.  Is
>: there something equivalent to dry-transfer lettering for printers?
>: Thanks for any info.

>I wish I had the name of the company off hand, but one of the toner
>transfer PCB products I've used, touted their product for producing panel
>graphics as well. In brief, you print on their release paper, spray the
>printed side of the paper with clear lacquer and let dry. Then, cut the
>area out you want to use as a transfer, soak in water for a few minutes
>and it slips off the release paper just like a decal (for those that have
>built styrene models). They say it should work on other types of printers
>too (probably won't work on inkjets that use water soluble inks, IMO).

If my memory serves me the name of the company is "Dyna Art Designs"
in US, or am I wrong ?

/Christer

-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
 * High Tech Horizon - Christer Johansson - * email: [e-mail] *
-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
 * Vi saljer Parallax, Inc. BASIC Stamp's produkter i Skandinavien *
    >> World Wide Web - http://www.algonet.se/~cj/catalog.html <<
-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-



From [e-mail] Sun Aug 27 17:28:59 1995
Path: grape.epix.net!news.sprintlink.net!howland.reston.ans.net!news-e1a.megaweb.com!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail
From: [e-mail] (SHACK 9529)
Newsgroups: rec.radio.amateur.homebrew
Subject: NEED HELP MAKING TV OSCILLATOR/JAMMER, SHORT RANGE
Date: 26 Aug 1995 00:28:38 -0400
Organization: America Online, Inc. (1-800-827-6364)
Lines: 5
Sender: [e-mail]
Message-ID: <41m7tm$[e-mail]>
Reply-To: [e-mail] (SHACK 9529)
NNTP-Posting-Host: newsbf02.mail.aol.com

DOES ANYONE KNOW HOW TO MAKE AN OSCILLATION CIRCUIT THAT WILL INTERFERE
WITH TV. MY PURPOSE IS TO USE IT AS A JOKE DURING FOOTBALL GAMES AT A
FRIENDS HOUSE.

PLEASE HELP!   THANKS


From [e-mail] Sun Aug 27 17:29:00 1995
Path: grape.epix.net!news.sprintlink.net!howland.reston.ans.net!newsjunkie.ans.net!esol.intermedia.com!news
From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: NEED HELP MAKING TV OSCILLATOR/JAMMER, SHORT RANGE
Date: Sat, 26 Aug 95 07:06:20 PDT
Organization: (None)
Lines: 12
Message-ID: <[e-mail]>
References: <41m7tm$[e-mail]>
NNTP-Posting-Host: 204.149.224.22
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X-Newsreader: NEWTNews & Chameleon -- TCP/IP for MS Windows from NetManage


In Article<41m7tm$[e-mail]>, <[e-mail]> writes:
>
> DOES ANYONE KNOW HOW TO MAKE AN OSCILLATION CIRCUIT THAT WILL INTERFERE
> WITH TV. MY PURPOSE IS TO USE IT AS A JOKE DURING FOOTBALL GAMES AT A
> FRIENDS HOUSE.
>
> PLEASE HELP!   THANKS

Beg, borrow, or steal a grid dip meter or its modern equivalent.  Don't forget
to wear a kevlar vest.



From [e-mail] Sun Aug 27 17:29:01 1995
Path: grape.epix.net!news.sprintlink.net!in2.uu.net!news.sandia.gov!tesuque.cs.sandia.gov!SantaFe!usenet
From: Jim Potter <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: NEED HELP MAKING TV OSCILLATOR/JAMMER, SHORT RANGE
Date: 27 Aug 1995 13:04:51 GMT
Organization: JP Accelerator Works, Inc.
Lines: 23
Message-ID: <41pqhj$[e-mail]>
References: <41m7tm$[e-mail]>
NNTP-Posting-Host: dial130.roadrunner.com
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
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To: [e-mail]

A possible approach is to get a TV tuner, the kind that has has a voltage controlled
oscillator and covers tha cable channels.  I built a sweep generator using one and
it covered from 50 MHz to 950 MHz in about 4 ranges each covering approxiamtely a 2
to 1 frequency range.  You'll need the wiring information to know where to apply
power and how to switch the frequency range.  And, then you have to figure out where
to couple out some of the rf.  That's not too hard since ther is a frequency divider
in there for the phase lock circuitry and you can probably steal from its input
without messing things up too much.  Radio Shack used to have one in a blister pack.
And, there have been articles in Ham Magazines about using TV tuners as the local
oscillator in a spectrum analyzer.  Someone was even selling a kit at one time.

Of course, the grid dip oscillator approach is quick since you don't have to build
anything.

--
===================================================================

James M. Potter, President      Internet: [e-mail]
JP Accelerator Works, Inc.      AOL: [e-mail]
2245 47th Street                Voice: 505-662-5804
Los Alamos, NM 87544-1604       FAX: [phone]




From [e-mail] Sun Aug 27 17:29:01 1995
Path: grape.epix.net!news.sprintlink.net!newsfeed.internetmci.com!news.uoregon.edu!vixen.cso.uiuc.edu!uwm.edu!math.ohio-state.edu!pacific.mps.ohio-state.edu!freenet.columbus.oh.us!not-for-mail
From: [e-mail] (Sergei Kulyov)
Newsgroups: rec.radio.amateur.homebrew
Subject: Need help with Super super Dentron tuner
Date: 27 Aug 1995 13:44:15 -0400
Organization: The Greater Columbus FreeNet
Lines: 8
Message-ID: <41qatf$[e-mail]>
NNTP-Posting-Host: acme.freenet.columbus.oh.us
X-Newsreader: TIN [version 1.2 PL2]


Hi gang. I have a Super super Dentron antenna tuner with one
missed part inside. There are one air vary capacitor, balun,
and couple air core coils.
Does anybody could help with schematic or suggestion about the
missed part?
Thanks,
73! Sergei AA8OT, UA3AP


From [e-mail] Sun Aug 27 17:29:02 1995
Path: grape.epix.net!news.sprintlink.net!howland.reston.ans.net!news-e1a.megaweb.com!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail
From: [e-mail] (LynnGol)
Newsgroups: rec.radio.amateur.homebrew
Subject: Need source of custom CERAMIC Filters for 240kHz
Date: 25 Aug 1995 23:09:48 -0400
Organization: America Online, Inc. (1-800-827-6364)
Lines: 7
Sender: [e-mail]
Message-ID: <41m39s$[e-mail]>
Reply-To: [e-mail] (LynnGol)
NNTP-Posting-Host: newsbf02.mail.aol.com

I am looking for a company that can build custom Ceramic Filters for 240
kHz.
All the places I found just sell off-the-shelf units.  Quantity needs are
in
the low 1000's per year.

Mark  KH6HPQ


From [e-mail] Sun Aug 27 17:29:03 1995
Newsgroups: rec.radio.amateur.homebrew
Path: grape.epix.net!news.sprintlink.net!in2.uu.net!panix!bloom-beacon.mit.edu!news.kei.com!ub!galileo.cc.rochester.edu!alfalfa.pas.rochester.edu!bill
From: [e-mail] (Bill VanRemmen)
Subject: Re: Need source of custom CERAMIC Filters for 240kHz
Message-ID: <[e-mail]>
Sender: [e-mail]
Nntp-Posting-Host: alfalfa.pas.rochester.edu
Organization: University of Rochester Computing Center
X-Newsreader: TIN [version 1.2 PL0]
References: <41m39s$[e-mail]>
Date: Sun, 27 Aug 95 02:28:46 GMT
Lines: 9

LynnGol ([e-mail]) wrote:
: I am looking for a company that can build custom Ceramic Filters for 240
: kHz.

Don't know if they do custom filters, but have you tried muRata/Erie?
404-436-1300

                                -Bill, KA2WFJ



From [e-mail] Sun Aug 27 17:29:03 1995
Path: grape.epix.net!news.sprintlink.net!howland.reston.ans.net!usc!math.ohio-state.edu!pacific.mps.ohio-state.edu!freenet.columbus.oh.us!not-for-mail
From: [e-mail] (Sergei Kulyov)
Newsgroups: rec.radio.amateur.homebrew
Subject: Need: MFJ-8621 schematic
Date: 27 Aug 1995 13:54:04 -0400
Organization: The Greater Columbus FreeNet
Lines: 5
Message-ID: <41qbfs$[e-mail]>
NNTP-Posting-Host: acme.freenet.columbus.oh.us
X-Newsreader: TIN [version 1.2 PL2]


Hi gang. I'm looking for the schematic of Data radio MFJ-621.
Will appreciate for any help.

73! Sergei AA8OT, UA3AP


From [e-mail] Sun Aug 27 17:29:05 1995
Path: grape.epix.net!news.sprintlink.net!nwfocus1.wa.com!news1.halcyon.com!chinook.halcyon.com!mcraw
From: Marshall Craw <[e-mail]>
Newsgroups: rec.radio.swap,rec.radio.scanner,rec.radio.amateur.homebrew,rec.radio.amateur.digital.misc
Subject: NEW HAM RADIO REMOTE CONTROL PRODUCT OFFERED
Date: Thu, 24 Aug 1995 18:37:01 -0700
Organization: Northwest Nexus Inc.
Lines: 35
Message-ID: <[e-mail]>
References: <[e-mail]> <[e-mail]> <[e-mail]>
NNTP-Posting-Host: chinook.halcyon.com
Mime-Version: 1.0
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In-Reply-To: <[e-mail]>
Xref: grape.epix.net rec.radio.swap:42064 rec.radio.scanner:31130 rec.radio.amateur.homebrew:9149 rec.radio.amateur.digital.misc:10180



   I am pleased to announce a new product offered by Positive Time Systems
   called the RCS-I.  This is a radio controller that connects to any VHF/UHF
   transceiver and can issue x-10 commands. (X-10 is a power line standard
   for controlling devices throughout a building. Sears, Radio Shack, and
   others offer these compatible units)
    The unit also has an alarm input, a listen feature, a short voicmail box,
   and responds to all commands in a pleasant female voice. The system IDs
   with your recorded voice and call sign.  This description doesn't do the
   product justice, so please check out the new homepage at :

                   http://www.halcyon.com/pos.time.sys/top

   or you may email us with you address so that we can promptly send you
   our brochure and newsletter.

   NOTE: This product is intended for US voltages of 120 / 220 VAC.  Another
   version is offered to support other international power standards.

   FLASH! NEW FEATURE!  The RCS-I has a new feature called Secure Access
   Mode(SAM).  When enabled, the access code changes dozens of times per
   hour, making it virtually impossible to hack into.

   This Product will work on other radio services like GMRS. Marine and
   Business bands!

   Thank You,


Marshall Craw   <[e-mail]>
Positive Time Systems [phone]
470 E North Bend Way, Suite 115
North Bend, WA  98045



From [e-mail] Sun Aug 27 17:29:05 1995
Path: grape.epix.net!news.sprintlink.net!news.zeitgeist.net!punchdown.zocalo.com!usenet
From: Jeffrey Pawlan <[e-mail]>
Newsgroups: rec.radio.swap,rec.radio.scanner,rec.radio.amateur.homebrew,rec.radio.amateur.digital.misc
Subject: Re: NEW HAM RADIO REMOTE CONTROL PRODUCT OFFERED
Date: 25 Aug 1995 19:12:17 GMT
Organization: Zocalo Engineering - Berkeley, California, USA
Lines: 3
Message-ID: <41l7ah$[e-mail]>
References: <[e-mail]> <[e-mail]> <[e-mail]> <[e-mail]>
NNTP-Posting-Host: 192.135.76.232
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Xref: grape.epix.net rec.radio.swap:42144 rec.radio.scanner:31174 rec.radio.amateur.homebrew:9174 rec.radio.amateur.digital.misc:10204

So you, too, can flush your toilet by remote control while sitting in rush-hour
traffic!



From [e-mail] Sun Aug 27 17:29:06 1995
Path: grape.epix.net!news.sprintlink.net!news.azstarnet.com!usenet
From: Wes Stewart <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Noise Figure Circles
Date: 25 Aug 1995 01:08:54 GMT
Organization: Arizona Daily Star - AZSTARNET
Lines: 31
Message-ID: <41j7r6$[e-mail]>
References: <41ikb0$[e-mail]>
NNTP-Posting-Host: sprite213.azstarnet.com
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Super-User <root> wrote:
>I am trying to plot noise figure circles for a preamplifier at 400 MHz. Anybody
>know a good way to do that?
>
>or:
>
>If I have a 50 ohm source and I want to continuously transform it from some low
>impedance (around 2-5 ohms) to something like 100 or 1000 ohms how can I do
>that? This is for plotting circles of constant noise figure on the resistance
>axis of the Smith Chart.
>
>I am thinking about coupling the 50 ohm noise source into a big resonator and
>then using a variable output coupling to get my impedance transform. Will that
>work?
>
Steve:


I believe what you are wanting to do is make the noise source look like a
source impedance which varies over some area of the Smith chart.
You can't plot circles ON the resistance axis tho ;-)

You might try using a double or triple-stub tuner,
but understand that you almost need a network analyzer to
measure looking back into the tuner/noise source to determine
the actual source impedance. Also, the tuner losses directly
subtract from the ENR of the noise source,
so you must determine them as well if you want accurate noise figure numbers.

HTH, Regards, Wes -- N7WS



From [e-mail] Sun Aug 27 17:29:09 1995
Path: grape.epix.net!news.sprintlink.net!gatech!newsfeed.pitt.edu!godot.cc.duq.edu!news.duke.edu!usenet
From: Super-User <root>
Newsgroups: rec.radio.amateur.homebrew
Subject: Noise Figure Circles
Date: 24 Aug 1995 19:36:00 GMT
Organization: Duke University, Durham, NC, USA
Lines: 18
Message-ID: <41ikb0$[e-mail]>
NNTP-Posting-Host: shadow.mc.duke.edu
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I am trying to plot noise figure circles for a preamplifier at 400 MHz. Anybody
know a good way to do that?

or:

If I have a 50 ohm source and I want to continuously transform it from some low
impedance (around 2-5 ohms) to something like 100 or 1000 ohms how can I do
that? This is for plotting circles of constant noise figure on the resistance
axis of the Smith Chart.

I am thinking about coupling the 50 ohm noise source into a big resonator and
then using a variable output coupling to get my impedance transform. Will that
work?

[e-mail]

steve



From [e-mail] Sun Aug 27 17:29:10 1995
Newsgroups: rec.radio.amateur.homebrew
Path: grape.epix.net!news.sprintlink.net!simtel!lll-winken.llnl.gov!enews.sgi.com!wdl1.wdl.loral.com!enterprise!pax!jeffa
From: [e-mail] (Jeff Albom)
Subject: Re: Noise Figure Circles
Message-ID: <[e-mail]>
Sender: jeffa@pax (Jeff Albom)
Organization: Space Systems Loral
References:  <41ikb0$[e-mail]>
Date: Fri, 25 Aug 1995 15:48:49 GMT
Lines: 32

It is not essential to plot noise figure circles for most circuits. As long as
the circuit is "nicely behaved" (most amps and low Q circuits, forthat matter,
are), you can take measurements at a set of match conditions and use these match
points to generate iso-noise match curves (which are usually similar to circles).
The same technique applies to load-pull measurements. Of course, you need to know
the match that you are providing to the amplifier. This usually means measuring
the matching circuit/tuner w/ a vector network analyzer or phase meter. At 400MHZ,
you could use a very fast scope to compare amp/phase of the direct and coupled
ports of a coupler in-line with your tuner, but then you have to calibrate out the
coupler effects (there is loss and phase between direct and coupled ports on a
well isolated coupler of, say, broadwall or stripline/microstrip variety).

Another option is to use a tuner or known VSWR match and put a variable delay
line between it and a coupler and the amp. As normal, put detectors on the
direct and coupled ports of the coupler. Twiddle the delay line through a full
cycle of coupler readings. If you can determine a single point on the tuner curve
(via phase meter or VNA), you essentially referenced that point to the associated
noise figure and all other points since the other points describe a circle locus
w/ the Smith chart center as center of the locus. Of course, you still need to
measure the noise figure at points along the phase rotation locus of matches.
It's just that now, you don't have to determine the match for n arbitrary loads.
Even better if you hook a VNA to the coupler and calibrate the measurement system.
With this, the match shows up on the VNA and all you have to do is take noise
figure measurements at points along the locus.

It all boils down to what equipment you have available.

*************************************************************************
What appears to be a sloppy or meaningless use of words may well be a
completely correct use of words to express sloppy or meaningless ideas.
*************************************************************************
[e-mail]


From [e-mail] Sun Aug 27 17:29:10 1995
Path: grape.epix.net!news.sprintlink.net!newsfeed.internetmci.com!usenet.eel.ufl.edu!col.hp.com!simtel!harbinger.cc.monash.edu.au!yoyo.aarnet.edu.au!fang.dsto.defence.gov.au!dstos3.dsto.defence.gov.au!cusick
From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: PCB & Iron-on transfer
Date: 21 Aug 95 08:28:41 +1030
Organization: Defence Science and Technology Organisation
Lines: 12
Message-ID: <[e-mail]>
NNTP-Posting-Host: dstos3.dsto.gov.au

For those who are interested, I have used ordinary photocopy paper, and
transfered the image onto the PCB using the usual hot iron trick.

To remove the paper, soak the board and paper in a strong (50%) blend
of household bleach and water. After a few minutes, the paper will dissolve
leaving the toner behind. By carefully using your finger, you
can remove the fur left behind.

Greg
VK3BRQ




From [e-mail] Sun Aug 27 17:29:12 1995
Path: grape.epix.net!news.sprintlink.net!ddi2.digital.net!usenet
From: [e-mail] (Russ Leblanc)
Newsgroups: rec.radio.amateur.antenna,rec.radio.amateur.homebrew
Subject: Re: phased array receiving antennas
Date: 26 Aug 1995 02:34:42 GMT
Organization: Hurricane DX Club
Lines: 41
Message-ID: <41m182$[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: @204.215.242.151
X-Newsreader: WinVN 0.90.4
Xref: grape.epix.net rec.radio.amateur.antenna:13324 rec.radio.amateur.homebrew:9178

In article <[e-mail]>, [e-mail] (Steve Byan) says:


>My next problem is designing a high-input-impedance, high-dynamic-range
>differential RF amp for the output of the phase shift network.

And don't forget low noise, Steve ;-)  I work on such ...

>I've noticed the new JPS antenna noise canceling unit (which is a
>phased-array receiving antenna, intended to null locally-generated RFI

I wouldn't quite call it a phased array.  You simply either pickup
(radio) or synthesize the offending signal, flip the phase 180
degrees, sum the signals, and voila!  Noise reduction.  An old dog
learning new tricks...<g>

>noise) must use some kind of wideband phase-shift network, since it covers
>at least 3 to 30 MHz with only a two-position bandswitch: low band and
>high band. Has anyone opened one of these up? What does the phasing
>network look like? Is it a polyphase network? What does JPS use for an
>amplifier?

According to info leaked out, its a hybrid combiner, and accounts for
some loss of the desired receive signal.  My guess is that it's
transformer based, the noise signal being fed 180 out from the main
antenna.  The phase shift network compensates for phase error due
to parasitics in the network which might cause the noise channel to
deviate from desired 180 degrees as a function of frequency.

I'm guessing here, but WILL find the eventual answer.

I've played with one at a local ham store, and on first trial it did
eradicate some local power line noise.  My original desire was for
a wideband antenna phaser for far-field null-steering apps as well
as diversity reception.

Russ






From [e-mail] Sun Aug 27 17:29:12 1995
Path: grape.epix.net!news.sprintlink.net!malgudi.oar.net!news.erinet.com!bug.rahul.net!a2i!sierra.net!brockway-d229.sierra.net!user
From: [e-mail] (Robert Tetrault)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Plans/schemes for radio -- where to be found ?
Date: Thu, 24 Aug 1995 21:45:38 -0700
Organization: Engineered Solutions
Lines: 5
Message-ID: <[e-mail]>
References: <41j1r4$[e-mail]>
NNTP-Posting-Host: 204.94.234.229

Suggest you get a current copy of the Handbook from the Radio Society of
Great britain.  They seem to have a lively activity of receiver builders,
of a very high order.  Prepare for a technically demanding project.
>
> Thanks.


From [e-mail] Sun Aug 27 17:29:14 1995
Path: grape.epix.net!news.sprintlink.net!metro.atlanta.com!nntp.atlanta.com!news
From: [e-mail] (kb8rjy)
Newsgroups: rec.radio.amateur.antenna,rec.radio.amateur.digital.misc,rec.radio.amateur.equipment,rec.radio.amateur.homebrew,rec.radio.amateur.misc,rec.radio.amateur.policy,rec.radio.amateur.space
Subject: QSL cards
Date: Sat, 26 Aug 1995 20:28:49 GMT
Organization: Marquette Senior High School
Lines: 77
Message-ID: <41ntdp$[e-mail]>
Reply-To: [e-mail]
NNTP-Posting-Host: pm039-04.dialip.mich.net
X-Newsreader: Forte Free Agent 1.0.82
Xref: grape.epix.net rec.radio.amateur.antenna:13334 rec.radio.amateur.digital.misc:10215 rec.radio.amateur.equipment:16238 rec.radio.amateur.homebrew:9186 rec.radio.amateur.misc:85542 rec.radio.amateur.policy:29118 rec.radio.amateur.space:4671

Check this out - QSL cards!



With your own custom graphics, and text...



only $5.95 for 50!...



Custom design your cards with up to 80 Characters of text, and Your
own scanned
graphic / or antenna graphic.



Just fill out the following form, and send with total (check or money
order) to:
Shaun Qualheim, KB8RJY

QSL cards

Dept. BBS

224 Cherry Creek Road

Marquette, MI 49855



(Print, and cut here:)

________________________________________________________________________________
Order Form: QSL Cards

________________________________________________________________________________
Front Text:
____________________________________________________________________
________________________________________________________________________________
(up to 80 characters on front) - back will have standard QSL reply
fields.
Is a graphic/photo to be scanned included? (yes/no) ____

Do you wish to have the antenna included on your qsl card instead?
(yes/no) ____
Number of sets: (50 in a set, $5.95 a set)     ____ times $5.95 = ____

Plus Shipping and handling: ($1.50 per set)    ____ times $5.95 = ____

Plus Scanning fee ($1.00)                                         ____



                                TOTAL (sets + s & h + scan fee)
=____

________________________________________________________________________________
(cut here)





Thank You

Shaun Qualheim, kb8rjy

Internet: [e-mail]









From [e-mail] Sun Aug 27 17:29:15 1995
Path: grape.epix.net!news.sprintlink.net!metro.atlanta.com!nntp.atlanta.com!news
From: [e-mail] (kb8rjy)
Newsgroups: rec.radio.amateur.antenna,rec.radio.amateur.digital.misc,rec.radio.amateur.equipment,rec.radio.amateur.homebrew,rec.radio.amateur.misc,rec.radio.amateur.policy,rec.radio.amateur.space
Subject: QSL cards - qslad.txt (1/1)
Date: Sat, 26 Aug 1995 19:25:06 GMT
Organization: Internet Atlanta
Lines: 75
Message-ID: <41npm9$[e-mail]>
NNTP-Posting-Host: pm039-04.dialip.mich.net
X-Newsreader: Forte Free Agent 1.0.82
Xref: grape.epix.net rec.radio.amateur.antenna:13333 rec.radio.amateur.digital.misc:10214 rec.radio.amateur.equipment:16235 rec.radio.amateur.homebrew:9185 rec.radio.amateur.misc:85538 rec.radio.amateur.policy:29116 rec.radio.amateur.space:4668

begin 644 qslad.txt
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M("`@("`@("`@("`@("`@("`@("`@("`@("`@("`@("`@("`@("`@("`@("`@
M("`@("`@("`@("`@("`@("`-"D1E<'0N($)"4R`@("`@("`@("`@("`@("`@
M("`@("`@("`@("`@("`@("`@("`@("`@("`@("`@("`@("`@("`@("`@("`@
M("`@("`@(`T*,C(T($-H97)R>2!#<F5E:R!2;V%D("`@("`@("`@("`@("`@
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M("`@("`@("`@("`@("`@("`@("`@(`T**%!R:6YT+"!A;F0@8W5T(&AE<F4Z
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M("`@("`@("`@("`@#0I?7U]?7U]?7U]?7U]?7U]?7U]?7U]?7U]?7U]?7U]?
M7U]?7U]?7U]?7U]?7U]?7U]?7U]?7U]?7U]?7U]?7U]?7U]?7U]?7U]?7U]?
M7U]?7PT*3W)D97(@1F]R;3H@45-,($-A<F1S("`@("`@("`@("`@("`@("`@
M("`@("`@("`@("`@("`@("`@("`@("`@("`@("`@("`@("`@("`@#0I?7U]?
M7U]?7U]?7U]?7U]?7U]?7U]?7U]?7U]?7U]?7U]?7U]?7U]?7U]?7U]?7U]?
M7U]?7U]?7U]?7U]?7U]?7U]?7U]?7U]?7U]?7U]?7PT*1G)O;G0@5&5X=#H@
M7U]?7U]?7U]?7U]?7U]?7U]?7U]?7U]?7U]?7U]?7U]?7U]?7U]?7U]?7U]?
M7U]?7U]?7U]?7U]?7U]?7U]?7U]?7U\-"E]?7U]?7U]?7U]?7U]?7U]?7U]?
M7U]?7U]?7U]?7U]?7U]?7U]?7U]?7U]?7U]?7U]?7U]?7U]?7U]?7U]?7U]?
M7U]?7U]?7U]?7U]?7U]?#0HH=7`@=&\@.#`@8VAA<F%C=&5R<R!O;B!F<F]N
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M("`@("`@("`@("`@("`@("`@("`@("`@("`@("`@("`@("`@(`T*("`@("`@
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M("`@("`@("`@("`@("`@("`-"E]?7U]?7U]?7U]?7U]?7U]?7U]?7U]?7U]?
M7U]?7U]?7U]?7U]?7U]?7U]?7U]?7U]?7U]?7U]?7U]?7U]?7U]?7U]?7U]?
M7U]?7U]?7U]?#0HH8W5T(&AE<F4I("`@("`@("`@("`@("`@("`@("`@("`@
M("`@("`@("`@("`@("`@("`@("`@("`@("`@("`@("`@("`@("`@("`@("`-
M"B`@("`@("`@("`@("`@("`@("`@("`@("`@("`@("`@("`@("`@("`@("`@
M("`@("`@("`@("`@("`@("`@("`@("`@("`@("`@("`@(`T*("`@("`@("`@
M("`@("`@("`@("`@("`@("`@("`@("`@("`@("`@("`@("`@("`@("`@("`@
M("`@("`@("`@("`@("`@("`@("`@("`@#0I4:&%N:R!9;W4@("`@("`@("`@
M("`@("`@("`@("`@("`@("`@("`@("`@("`@("`@("`@("`@("`@("`@("`@
M("`@("`@("`@("`@("`-"E-H875N(%%U86QH96EM+"!K8CAR:GD@("`@("`@
M("`@("`@("`@("`@("`@("`@("`@("`@("`@("`@("`@("`@("`@("`@("`@
M("`@(`T*26YT97)N970Z(&MB.')J>4!M+6YE="YA<F)O<FYE="YO<F<@("`@
M("`@("`@("`@("`@("`@("`@("`@("`@("`@("`@("`@("`@("`@#0H@("`@
M("`@("`@("`@("`@("`@("`@("`@("`@("`@("`@("`@("`@("`@("`@("`@
M("`@("`@("`@("`@("`@("`@("`@("`@("`@("`-"B`@("`@("`@("`@("`@
M("`@("`@("`@("`@("`@("`@("`@("`@("`@("`@("`@("`@("`@("`@("`@
6("`@("`@("`@("`@("`@("`@(`T*&O__
`
end


From [e-mail] Sun Aug 27 17:29:16 1995
Path: grape.epix.net!news.sprintlink.net!in1.uu.net!bud.shadow.net!news
From: Eliot Fenton <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: RF design
Date: 27 Aug 1995 01:00:55 GMT
Organization: ICS Inc.
Lines: 16
Message-ID: <41og47$[e-mail]>
References: <41htin$[e-mail]>
NNTP-Posting-Host: ppp-ftl2-23.shadow.net
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 1.2b6 (Windows; I; 16bit)
To: [e-mail]

[e-mail] (Workshop) wrote:
>Is there anyone out there who can tell me if there are any sites on the internet where I can find out about RF design.
>For example designing impedance matching circuits etc.
>Pls email me at the above address
>thanx
>Robin

You might check Motorola's site (I don't have the address off hand, but
it's fairly easy to find with Yahoo, Lycos, etc.); they have app notes
galore and you can request data books with all pertinet information.

--
Eliot Fenton
[e-mail]




From [e-mail] Sun Aug 27 17:29:16 1995
Path: grape.epix.net!news.sprintlink.net!howland.reston.ans.net!news.cac.psu.edu!news.math.psu.edu!hudson.lm.com!godot.cc.duq.edu!news.duke.edu!usenet
From: [e-mail] (james P. Meyer)
Newsgroups: rec.radio.amateur.homebrew
Subject: Schematics from Radio Shack
Date: Sat, 26 Aug 1995 12:49:09 GMT
Organization: Duke University, Durham, NC, USA
Lines: 15
Message-ID: <41na2e$[e-mail]>
NNTP-Posting-Host: async119.async.duke.edu
X-Newsreader: Forte Free Agent 1.0.82


        Before I spend money on something that may not be what I need, I'll
ask for some advise.

        I've got a used R-S DX-440 that seems to be a bit low in sensitivity
on almost all the AM bands including all the SW bands.  I could test
and probably fix whatever's wrong if I could get decent schematics.
Is whatever service manual I might be able to get from R-S going to be
halfway decent as far as showing me a full schematic with parts
values?  If so, what's the R-S part number for the manual?

Jim "no sig" Meyer





From [e-mail] Sun Aug 27 17:29:17 1995
Path: grape.epix.net!news.sprintlink.net!ddi2.digital.net!usenet
From: [e-mail] (Russ Leblanc)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Schematics from Radio Shack
Date: 27 Aug 1995 18:44:34 GMT
Organization: Hurricane DX Club
Lines: 26
Message-ID: <41qeei$[e-mail]>
References: <41na2e$[e-mail]>
NNTP-Posting-Host: @204.215.242.151
X-Newsreader: WinVN 0.90.4

In article <41na2e$[e-mail]>, [e-mail] (james P. Meyer) says:
>
>
>        Before I spend money on something that may not be what I need, I'll
>ask for some advise.
>
>        I've got a used R-S DX-440 that seems to be a bit low in sensitivity
>on almost all the AM bands including all the SW bands.  I could test
>and probably fix whatever's wrong if I could get decent schematics.
>Is whatever service manual I might be able to get from R-S going to be
>halfway decent as far as showing me a full schematic with parts
>values?  If so, what's the R-S part number for the manual?

They can get it for you from their service department.  Make sure you ask for
THE SERVICE MANUAL, NOT THE OWNER'S MANUAL or else the bonehead will screw up
and send you the wrong one (like they did to me for a DX390).

Your 440 is probably suffering from a weakened or blown 1st RF amp due to
static pickup or nearby lightning strikes, and is typical on shortwave
portables that lack a protective diode network in the antenna input circuit
ahead of the RF amp.  You could try tracing the circuit from the whip/ant
jack to find the transistor, and replace it.  You might also try asking
on the rec.radio.shortwave newsgroup or the Fidonet shortwave conference,
where this has been discussed in the past.

Russ


From [e-mail] Sun Aug 27 17:29:18 1995
Newsgroups: rec.radio.amateur.homebrew
Path: grape.epix.net!news.sprintlink.net!newsfeed.internetmci.com!EU.net!CERN.ch!sp065!bohl
From: [e-mail] (Thomas Bohl)
Subject: Search spare part for Mini Circuits wideband amplifier
X-Nntp-Posting-Host: sp065.cern.ch
Message-ID: <bohl.809360786@rscernix>
Sender: [e-mail] (USENET News System)
Organization: CERN European Lab for Particle Physics
X-Newsreader: NN version 6.5.0 #7 (NOV)
Date: Fri, 25 Aug 1995 14:26:26 GMT
Lines: 10


   Dear colleagues,

   does anybody know what type of transistor is used in the final
   stage of the Mini Circuits wideband amplifier ZHL-1042-J ?

   73 de Thomas, F5SWE
   [e-mail]




From [e-mail] Sun Aug 27 17:29:18 1995
Path: grape.epix.net!news.sprintlink.net!bga.com!ftp.unisql.com!unisql.unisql.com!news
From: Jim Strohm <jstrohm@blazer>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Search spare part for Mini Circuits wideband amplifier
Date: 25 Aug 1995 15:58:16 GMT
Organization: UniSQL, Inc.
Lines: 14
Message-ID: <41kruo$[e-mail]>
References: <bohl.809360786@rscernix>
NNTP-Posting-Host: blazer.unisql.com
X-Newsreader: NCSA Mosaic

Thomas Bohl writes:
>
>    does anybody know what type of transistor is used in the final
>    stage of the Mini Circuits wideband amplifier ZHL-1042-J ?
>

Mini-Circuits
P.O. Box 350166
Brooklyn NY 11235-0003 USA
718-934-4500
718-332-4661 fax

Those people should know.



From [e-mail] Sun Aug 27 17:29:19 1995
Path: grape.epix.net!news.sprintlink.net!in2.uu.net!solaris.cc.vt.edu!mkeitz
From: [e-mail] (Mike Keitz)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Search spare part for Mini Circuits wideband amplifier
Date: Fri, 25 Aug 95 18:21:46 GMT
Organization: TSE Systems
Lines: 25
Message-ID: <41l4ag$[e-mail]>
References: <bohl.809360786@rscernix> <41kruo$[e-mail]>
NNTP-Posting-Host: mkeitz.beve.blacksburg.va.us
X-Newsreader: News Xpress Version 1.0 Beta #4

In article <41kruo$[e-mail]>,
   Jim Strohm <jstrohm@blazer> wrote:
>Thomas Bohl writes:
>>
>>    does anybody know what type of transistor is used in the final
>>    stage of the Mini Circuits wideband amplifier ZHL-1042-J ?
>>
>
>Mini-Circuits
>P.O. Box 350166
>Brooklyn NY 11235-0003 USA
>718-934-4500
>718-332-4661 fax

I think it is an Avantek GaAS FET of some type.  We had one of those
amplifiers blow out (several stages bad, burned resistors, etc) a few years
ago, and sent it back to Mini-Circuits.  As they judged it "beyond repair",
they they traded it for a new one for about half the price of a new one
(still expensive!).  I don't know if they still do that or not.

-Mike KD4QDM






From [e-mail] Sun Aug 27 17:29:20 1995
Newsgroups: rec.radio.amateur.homebrew
Path: grape.epix.net!news.sprintlink.net!newsfeed.internetmci.com!tank.news.pipex.net!pipex!swrinde!sgigate.sgi.com!sdd.hp.com!hp-pcd!hpcvsnz!tomb
From: [e-mail] (Tom Bruhns)
Subject: Re: spark tx and VLF etc
Sender: [e-mail] (News )
Message-ID: <[e-mail]>
Date: Thu, 24 Aug 1995 18:48:40 GMT
References: <[e-mail]>
Nntp-Posting-Host: hplsnb.lsid.hp.com
Organization: Hewlett-Packard
X-Newsreader: TIN [version 1.1 PL9.4]
Lines: 49

Duncan Cadd ([e-mail]) wrote:
: Greetings, all, from a warm and sunny Diepenbeek in N.E. Belgium !



: " The really big VLF transmitters weren't sparks.  They were AC generators
: that worked at RF frequencies (or with mag amp frequency multipliers).
: Or were hydrogen arc transmitters that were negative resistance oscillators
: much like a multikilowatt neon lamp.  Both of which output CW, as opposed
: to the damped wave from a spark transmitter.

: I sure wouldn't want to hang around the keying relays when one of those
: things was sending.

: Mark Zenier  [e-mail]  [e-mail] "

: If I recall correctly, the AC generators went by a name like Amundsen
: Alternator, or something similar.  They had several hundred pole pieces,
: rotated at high rpm and had an output of the order of 20-30kc/s.  Two remain
: in existence in the world, one in Scandinavia, I think Sweden, which is
: occasionally wound up to show visiting statesmen (not hams who might understand
: it !) and the other is on the Eastern seabord of the USA somewhere, I think -
: and is fully operational, only closed down in the 1960s.  There was an issue
: of "Morsum Magnificat" a couple of years ago which carried an article on
: these old wonders.


: Hydrogen arcs I confess ignorance of !  If someone would enlighten me, I'd
: like to be less ignorant !

For folk who might have a casual interest in early transmitter (and
receiver) technology, look for issues of "Electronics World + Wireless
World" magazine from the UK.  Three articles I found that were interesting:

"Marconi's 200kW Transatlantic Transmitter,"  Jan. 1994, Pg. 29.
This was a CW SPARK (not alternator) transmitter.  There were amplitude
ripples, but apparently not a huge percentage.

"The Spark That Gave Radio to the World," Nov. 1993, Pg. 937.  This article
mentions spark transmitters up to 300kW, and possible efficiencies up to
60%.

"Germany's Imperial Wireless System," May 1993.  From this article, "Before
the evolution of high power transmitter valves, there were three ways to
generate high power CW:  Poulsen's quenched arc, Marconi's timed spark, and
radio frequency alternators."

73, K7ITM



From [e-mail] Sun Aug 27 17:29:20 1995
Path: grape.epix.net!news.sprintlink.net!nntpgate.primenet.com!news.asu.edu!aztec.asu.edu!jphipps
From: [e-mail] (JOHN PHIPPS)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: spark tx and VLF etc
Date: 26 Aug 1995 02:03:58 GMT
Organization: Arizona State University
Lines: 6
Message-ID: <41lvee$[e-mail]>
NNTP-Posting-Host: aztec.asu.edu


If memory serves me, the lo-frequency alternators were Fendessen,
not Amundsen. Amundsen was first at the South Pole - he did it on
dog sleds and did not take an alternator with him.

John, K7BTA


From [e-mail] Sun Aug 27 17:29:21 1995
Path: grape.epix.net!news.sprintlink.net!cs.utexas.edu!convex!news.duke.edu!usenet
From: [e-mail] (james P. Meyer)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: spark tx and VLF etc
Date: Sat, 26 Aug 1995 13:01:38 GMT
Organization: Duke University, Durham, NC, USA
Lines: 17
Message-ID: <41napq$[e-mail]>
References: <41lvee$[e-mail]>
NNTP-Posting-Host: async119.async.duke.edu
X-Newsreader: Forte Free Agent 1.0.82

[e-mail] (JOHN PHIPPS) wrote:


>If memory serves me, the lo-frequency alternators were Fendessen,
>not Amundsen. Amundsen was first at the South Pole - he did it on
>dog sleds and did not take an alternator with him.

        There *was* one guy that went with him to the south pole that *may*
have been an "alternator".  History just records his first name
though, Bruce.

        Then again, perhaps he was just a flashy dresser.

Jim "no sig" Meyer





From [e-mail] Sun Aug 27 17:29:22 1995
Path: grape.epix.net!news.sprintlink.net!howland.reston.ans.net!vixen.cso.uiuc.edu!prairienet.org!w9sz
From: [e-mail] (Zack Widup)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: spark tx and VLF etc
Date: 26 Aug 1995 22:39:08 GMT
Organization: University of Illinois at Urbana
Lines: 23
Message-ID: <41o7qc$[e-mail]>
References: <41lvee$[e-mail]>
Reply-To: [e-mail] (Zack Widup)
NNTP-Posting-Host: firefly.prairienet.org


In a previous article, [e-mail] (JOHN PHIPPS) says:

>
>If memory serves me, the lo-frequency alternators were Fendessen,
>not Amundsen. Amundsen was first at the South Pole - he did it on
>dog sleds and did not take an alternator with him.
>
>John, K7BTA
>

Rogger! Reginald Aubrey Fessenden used the low-frequency alternators.
From the book OPERATOR'S WIRELESS TELEGRAPH AND TELEPHONE HAND-BOOK by
Victor H. Laughter, 1909 (discussing Fessenden's station - with photos
and schematics!):

"The alternator which is used at the present day runs at a frequency of
80,000 to 100,000 per second, and the disagreeable noise at the receiving
end has been entirely eliminated. Such an alternator when run at a
frequency of 81,700 per second, gives a voltage of 150 volts open
circuit and a field current of 5 amperes."

                                73, Zack W9SZ


From [e-mail] Sun Aug 27 17:29:22 1995
Path: grape.epix.net!news.sprintlink.net!sunic!sunic.sunet.se!seunet!news2.swip.net!news.algonet.se!usenet
From: [e-mail] (Lars Andersson)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: spark tx and VLF etc
Date: 26 Aug 1995 16:45:03 GMT
Organization: AlgoNet Public Access Node, Stockholm
Lines: 13
Message-ID: <41nj2f$[e-mail]>
References: <41lvee$[e-mail]>
NNTP-Posting-Host: sophocles.algonet.se
X-Newsreader: WinVN 0.93.14

[e-mail] says...
>
>
>If memory serves me, the lo-frequency alternators were Fendessen,
>not Amundsen. Amundsen was first at the South Pole - he did it on
>dog sleds and did not take an alternator with him.
>
>John, K7BTA

Or maybe Alexanderson ?

Lars, SM0FOE



From [e-mail] Sun Aug 27 17:29:23 1995
Path: grape.epix.net!news.sprintlink.net!hookup!news.kei.com!simtel!news1.oakland.edu!jobone!ukma!asuvax!news.asu.edu!aztec.asu.edu!jphipps
From: [e-mail] (JOHN PHIPPS)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: spark tx and VLF etc
Date: 27 Aug 1995 06:06:28 GMT
Organization: Arizona State University
Lines: 3
Message-ID: <41p214$[e-mail]>
NNTP-Posting-Host: aztec.asu.edu


Alexanderson?? Maybe.......... Why does that  name ring a very
faint bell??


From [e-mail] Sun Aug 27 17:29:24 1995
Newsgroups: rec.radio.amateur.homebrew
Path: grape.epix.net!news.sprintlink.net!newsfeed.internetmci.com!usenet.eel.ufl.edu!interlog.com!news1.fonorola.net!geac!lethe!gts!westonia!ppp-1
From: [e-mail] (Joseph Cooper)
Subject: Re: spark tx and VLF etc
Message-ID: <[e-mail]>
Sender: [e-mail]
Nntp-Posting-Host: ppp-1.ppp.westonia.com
Organization: Westonia
X-Newsreader: News Xpress Version 1.0 Beta #3
References: <[e-mail]> <[e-mail]>
Date: Sun, 27 Aug 1995 14:26:46 GMT
Lines: 58

In article <[e-mail]>, [e-mail] (Tom Bruhns) wrote:
>Duncan Cadd ([e-mail]) wrote:

(Interesting info on VLF Xmiters sniped for space)

>: it !) and the other is on the Eastern seabord of the USA somewhere, I think
-
>: and is fully operational, only closed down in the 1960s.  There was an
issue
>: of "Morsum Magnificat" a couple of years ago which carried an article on
>: these old wonders.

I have been doing some research on these old VLF transmitters in the U.S., and
would be interested to know if someone may have more detailed information on
this, and others of its type.

In particular I would like to know if anyone knows of archival or book
material with pictures of the antenna systems for these stations. I have come
across some interesting references to huge systems with antena lengths of
nearly one mile and multiple tower with hights of over 600'.

At this time the only station that may fit the discription outlined in the
original email would be the Navy station NAA at Annapolis. I've seen it and it
is impressive.

There were stations at Newbrunswick, NJ. Rock Point, N.Y. Sayville N.Y.,
Marion, Mass. Tuckerton, N.J. that operated into the 1960's.

The Newnbrunswick operation was originally a Marconi spark station that was
taken over by RCA after WWI.

There was also stations at Arlington V.A., Pear Harbor and Challas Heights (a
suburb of San Diego) that had a 100kw, 200kw, and 200kw spark transmitters
respectivly.

Any ideas on these ?

There is also a very good book out (who's name I have forgotten) that has a
pictorial history of Marconi's huge spark xmitter in England. To give an idea
of the scale. First, check out your old ham manuals from the early 1920's and
see the diagrams for a spark xmiter. Then upscale it to 100kw. The(as in
one)capacitor used was housed in an open two story building. It was composed
of metal sheets hung from the ceiling and streached from one wall to the
other. There was about 6 feet between each sheet, so a person could walk
between them.

The rotary spark was kept in a special containment room, and from the pictures
shown, 100kw makes a very impressive show.

I'll look it up if there is interest.

Thanks in advance.


* Joseph Cooper:-VE3FMQ-QTH-East York-near Toronto Ontario Canada *
* Interests are:- BCB and VLF Radio-Woodworking-Steam Railroads - *
* -Nikola Tesla-Antique Radios-Crystal Radios-Travel-Burmese Cats *
* FAX [phone]:00pm to 5:00pm EDST Monday To Friday Only *


From [e-mail] Thu Aug 31 17:09:39 1995
Path: grape.epix.net!news.sprintlink.net!howland.reston.ans.net!math.ohio-state.edu!news.cyberstore.ca!skypoint.com!news3.mr.net!mr.net!news.mr.net!usenet
From: MRITUNJAY BANSAL <[e-mail]>
Newsgroups: soc.culture.russian,rec.radio.amateur.misc,rec.radio.amateur.homebrew,rec.radio.amateur.equipment,rec.radio.amateur.antenna,rec.ham-radio,ott.jobs,ott.forsale.other,ott.forsale.computing,ont.jobs,newbridge.rec,newbridge.notice,newbridge.forsale,misc.invest.technical,misc.invest.stocks,misc.invest.canada,bc.jobs,alt.current-events.russia,ab.jobs
Subject: Re: $1,800 WEEKLY! MAILING OUR CIRCULARS
Date: 28 Aug 1995 21:23:45 GMT
Organization: General Mills, Inc.
Lines: 8
Message-ID: <41tc51$[e-mail]>
References: <41ii92$[e-mail]> <[e-mail]> <41t2vt$[e-mail]>
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To: [e-mail]
Xref: grape.epix.net rec.radio.amateur.misc:85677 rec.radio.amateur.homebrew:9220 rec.radio.amateur.equipment:16350 rec.radio.amateur.antenna:13412 misc.invest.technical:16112 misc.invest.stocks:68042 misc.invest.canada:14674 alt.current-events.russia:10975

This is just the kind of disgusting commercial crap that we can do
without. In a high-tech world it seems, the anarchists could get away
with it!!!!!

Oh well, anxiety and pleasure I guess do go together.

Mritunjay



From [e-mail] Thu Aug 31 17:09:41 1995
Path: grape.epix.net!news.sprintlink.net!usenet.kornet.nm.kr!news.kreonet.re.kr!news.dacom.co.kr!newsfeed.internetmci.com!tank.news.pipex.net!pipex!howland.reston.ans.net!math.ohio-state.edu!news.cyberstore.ca!skypoint.com!news3.mr.net!mr.net!news.mr.net!timbuk.cray.com!equalizer!ihnp4.ucsd.edu!news1.ucsd.edu!news-mail-gateway
From: [e-mail] (ILSI)
Newsgroups: rec.radio.amateur.homebrew
Subject: (no subject)
Date: 30 Aug 95 03:55:06 GMT
Organization: Internet List Services Inc.
Lines: 21
Message-ID: <[e-mail]>
NNTP-Posting-Host: ucsd.edu
Originator: [e-mail]

     We would like to ask you to place a link from your site to our
homepage.  Please check out our homepage and let us know what you think.

     We have created a database to assist people that want to advertise on
the internet.  Using this database, people with homepages will now be able
to easily find appropriate sites for links to their homepage.

     We are Internet List Services Inc. and we would appreciate your help.
 Please visit us at:  http://www.ilsi.com/ilsi5.html



     Thank you,

     Gene








From [e-mail] Thu Aug 31 17:09:41 1995
Path: grape.epix.net!news.sprintlink.net!howland.reston.ans.net!torn!nott!dgbt!netfs.dnd.ca!nouvelles.e33.dreo.dnd.ca!usenet
From: [e-mail] (Norm Reed)
Newsgroups: rec.radio.amateur.homebrew
Subject: 220 MHz BANDPASS FILTER
Date: 29 Aug 1995 17:00:05 GMT
Organization: DREO
Lines: 11
Message-ID: <41vh2l$[e-mail]>
Reply-To: [e-mail]
NNTP-Posting-Host: 131.136.36.25
X-Newsreader: WinVN 0.92.3

Does anyone know of a good design of a 220 MHz bandpass filter with a 3dB
bandwith of around 5 Mhz or better.  I want to use it for a 220 low power
transmitter that I am building for high speed packet.  I am using a
wire over ground design for a 433 MHz bpf and it works great but 220 seems
to be more of a problem.

Thanks,


Norm
VE3AJI/VE7ALW


From [e-mail] Thu Aug 31 17:09:42 1995
Path: grape.epix.net!news.sprintlink.net!newsfeed.internetmci.com!tank.news.pipex.net!pipex!in1.uu.net!emi.com!esol.intermedia.com!news
From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: 220 MHz BANDPASS FILTER
Date: Tue, 29 Aug 95 12:56:30 PDT
Organization: (None)
Lines: 16
Message-ID: <[e-mail]>
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In Article<41vh2l$[e-mail]>,
<[e-mail]> writes:
> Does anyone know of a good design of a 220 MHz bandpass filter with a 3dB
> bandwith of around 5 Mhz or better.  I want to use it for a 220 low power
> transmitter that I am building for high speed packet.  I am using a
> wire over ground design for a 433 MHz bpf and it works great but 220 seems
> to be more of a problem.

Use a helical filter from Toko. I have used Toko #271MT-1166A and have great
results with the part.  Digi-Key has them ( part # TK3601-ND ). They can be
retuned a small amount, but be sure you have a sweep generator or network
analyzer, they are very sensitive.
George Carlson, Geotek Design Services




From [e-mail] Thu Aug 31 17:09:43 1995
Path: grape.epix.net!news.sprintlink.net!howland.reston.ans.net!spool.mu.edu!news.nd.edu!news1.oakland.edu!detroit.freenet.org!detroit.freenet.org!am024
From: [e-mail] (Robert Thomas Jackson)
Newsgroups: rec.radio.amateur.homebrew
Subject: 40 meter TXmitter plans/schem wanted.
Date: 30 Aug 1995 18:46:44 GMT
Organization: The Greater Detroit Free-Net
Lines: 7
Message-ID: <422bmk$[e-mail]>
NNTP-Posting-Host: detroit.freenet.org


Hi, I'm building the "Rock-Bending Reciever for 7 MHz" that was
featured in QST.  I want to build a 5 watt companion for the
piece.  Where can I find/buy plans/schematics for such a beast?
I want at least 5 watts out.  A kit would be nice! Where can I
find such a kit? Who makes them? Anyways, TNX in advance es 73 de
KB8UFP Bob.


From [e-mail] Thu Aug 31 17:09:44 1995
Path: grape.epix.net!news.sprintlink.net!in2.uu.net!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail
From: [e-mail] (W8JI  Tom)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: 4CX1500B push-pull amplifer.
Date: 31 Aug 1995 12:29:01 -0400
Organization: America Online, Inc. (1-800-827-6364)
Lines: 11
Sender: [e-mail]
Message-ID: <424o0d$[e-mail]>
References: <424ds7$[e-mail]>
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X-Newsreader: AOL Offline Reader

In article <424ds7$[e-mail]>, [e-mail] (J. Fred Riley)
writes:

>
>Push pull operation sounds like a way to start a diathermy machine.
>But not an amplifier.
>
>Fred

WA8America Jikabo Nickabo swoooosh swoooosh swoooooosh. Hey Fred you even
get QRMed on the net Tom


From [e-mail] Thu Aug 31 17:09:45 1995
Newsgroups: rec.radio.amateur.homebrew
Path: grape.epix.net!news.sprintlink.net!news3.insinc.net!newsfeed.direct.ca!newsfeed.internetmci.com!tank.news.pipex.net!pipex!uknet!bcc.ac.uk!news
From: [e-mail] (Dave Kirkby)
Subject: 4CX1500B push-pull amplifer.
Sender: [e-mail] (Usenet News System)
Message-ID: <[e-mail]>
Date: Wed, 30 Aug 1995 14:38:16 GMT
Reply-To: [e-mail]
Organization: UCL Dept of Medical Physics
Lines: 13


I've seen a mention in the VHF/UHF DX book that one can run a pair of 4CX1500B's in
a push-pull configuration, like the W1SL design (which is a well known 2m amp, using
a pair of 4CX250B's in push-pull, grounded cathode, grids driven). There is however no reference to a design doing this. Has anyone seen one, or no of som
done this?

Anyone ever got a pair of 4CX1000A's running on 2m ?? Ever tried and like me not done
too well?

dave kirkby G8WRB.





From [e-mail] Thu Aug 31 17:09:46 1995
Newsgroups: rec.radio.amateur.homebrew
Path: grape.epix.net!news.sprintlink.net!alfa02.medio.net!guysmiley.blarg.com!eskimo!news
From: [e-mail] (Doug Brooks)
Subject: Beldon Wire Specs
X-Nntp-Posting-Host: tia1.eskimo.com
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Date: Tue, 29 Aug 1995 04:35:00 GMT
Lines: 7

Does Beldon Have an internet site where they post the specs for the
various cables they offer? I want to use some Beldon Ethernet
Thinnet for antenna cable and want to compare its specs with other
more common beldon cables.
Thanks for your help




From [e-mail] Thu Aug 31 17:09:47 1995
Path: grape.epix.net!news.sprintlink.net!tank.news.pipex.net!pipex!in1.uu.net!newsflash.concordia.ca!canopus.cc.umanitoba.ca!access.mbnet.mb.ca!slmusr03
From: VE4KLM <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: building basic SWR meter with coax strip, diode, etc ?
Date: Wed, 30 Aug 1995 13:23:07 -0500
Organization: The University of Manitoba
Lines: 21
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Can some one give me a basic schematic or details on how to make
a basic SWR meter that I can use for 2 meters and 30 meters ?

The one I am looking for is made using a strip of coax, diodes, and
a few other miscellaneous parts. I heard about this on a local net,
but the details were not given, and no one seems to know who brought
it up in the first place.

Any help would be appreciated. Email me direct at [e-mail]
if you can.

Regards,

VE4KLM

 ---------------------
|  SLM Software Inc.  |
| [e-mail] |
 ---------------------



From [e-mail] Thu Aug 31 17:09:47 1995
Path: grape.epix.net!news.sprintlink.net!bga.com!news
From: [e-mail] (x)
Newsgroups: rec.radio.amateur.homebrew
Subject: designs for tube recordingstudio-grade mic preamp
Date: 29 Aug 1995 16:41:02 GMT
Organization: Your Organization
Lines: 8
Message-ID: <41vfuu$[e-mail]>
Reply-To: [e-mail]
NNTP-Posting-Host: jake-5o.aip.realtime.net
X-Newsreader: WinVN 0.92.6+

Any one know a souce for designs of audio pre amps . I want to try my hand a building some mic preamps
for recording applications. Old manuals or sourches of schematics would be
perfect.
Thanks
Ed Guinn
kb5ruf
[e-mail]



From [e-mail] Thu Aug 31 17:09:48 1995
Path: grape.epix.net!news.sprintlink.net!in1.uu.net!prodigy.com!usenet
From: [e-mail] (Arkon Kalashki)
Newsgroups: rec.radio.amateur.homebrew
Subject: Digital Voice Changer Info - need help
Date: 31 Aug 1995 05:42:21 GMT
Organization: Prodigy Services Company  1-800-PRODIGY
Lines: 8
Distribution: world
Message-ID: <423i3t$[e-mail]>
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X-Newsreader: Version 1.2

Would appreciate it if someone could direct me to plans & specs for a
good, high-quality digital voice changer.

I had plans for same in a magazine, but have lost it.  Would appreciate
any help.

Mudcat



From [e-mail] Thu Aug 31 17:09:49 1995
Path: grape.epix.net!news.sprintlink.net!newsfeed.internetmci.com!howland.reston.ans.net!Germany.EU.net!netmbx.de!uriela.in-berlin.de!newsun.netmbx.de!netmbx.netmbx.de!gerhard
From: [e-mail] (Gerhard Hoffmann)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Divide by ten front end for frequency counter
Date: 29 Aug 1995 19:49:20 GMT
Organization: netmbx GbR, Berlin, Germany
Lines: 28
Message-ID: <41vr00$[e-mail]>
References: <40rleh$[e-mail]> <[e-mail]> <415gsd$[e-mail]> <[e-mail]>
NNTP-Posting-Host: netmbx2.netmbx.de

In article <[e-mail]>,
Jon Goguen <[e-mail]> wrote:
>
>How do you make the divide by four that operates to 3 GHz?  I was under
>the impression that some sort of frequency conversion scheme was used to
>bring high frequencies down prior to the dividers and counters, but direct
>division would certainly be a lot easier.
>
Sony has the CXB1109Q quad ecl flipflop that works until 3.1 GHz typ.
and CXB1104 dual FF until 3.2 GHz.

The Motorola 10EL33 / 100EL33 is a %4 divider that works until 3800 MHz.
It is second sourced by Synergy Semiconductor.

Plessey has, among others the SP4908  2.5 GHz  %8 prescaler.

Most satellite receivers have PLL chips with built-in prescalers
that go to 2.6 GHz.


Gerhard


--
#  Gerhard Hoffmann            #     phone: [phone]     #
#  Gleditschstr. 79            #     fax:   [phone]     #
#  D10823 Berlin               #     on the air:  dk4xp            #
#  Germany                     #     in the air:  d-1441, d-kick   #


From [e-mail] Thu Aug 31 17:09:50 1995
Newsgroups: rec.radio.amateur.homebrew
Path: grape.epix.net!news.sprintlink.net!news.magicnet.net!news.supernet.net!news.cais.net!newsfeed.internetmci.com!howland.reston.ans.net!tank.news.pipex.net!pipex!uknet!bcc.ac.uk!news
From: [e-mail] (Dave Kirkby)
Subject: DOD006 valve - know of it???
Sender: [e-mail] (Usenet News System)
Message-ID: <[e-mail]>
Date: Wed, 30 Aug 1995 15:11:36 GMT
Reply-To: [e-mail]
Organization: UCL Dept of Medical Physics
Lines: 10

Many people are aware that there has been a lot of the above tubes flaoting around
cheaply. Deos anyone have a data sheet, or can tell me who made em? I've been
told thay are like the RCA/Burle 7213/7214, but *not* exactly the same. The data
sheet on the 7213 suggest these tubes would work fine on 70cm and perhaps (at a push)
on 23cm, but I gather this is not true. Above 2m is tricky, but a 1500W tube at 2m
is not to be sneesed at.

dave Kirkby G8WRB.




From [e-mail] Thu Aug 31 17:09:51 1995
Path: grape.epix.net!news.sprintlink.net!news.bluesky.net!gatech!howland.reston.ans.net!math.ohio-state.edu!jussieu.fr!univ-lyon1.fr!swidir.switch.ch!scsing.switch.ch!elna.ethz.ch!usenet
From: Essam Badreddin <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Drake R7- NB -filter
Date: 30 Aug 1995 09:34:37 GMT
Organization: Swiss Federal Inst. of Technology
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I would like to place the NB-filter of my R7 after the 2.IF ampli. chain
( just ahead of the 3.Mixer) to limit the broad-band noise.
Who knows the termination impedance of this filter?
I could estimate it to about 4500 Ohm using the capacitor-transformation
ratio of the tuned circuit ahead and behind the filter. What is the
exact value?




From [e-mail] Thu Aug 31 17:09:54 1995
Path: grape.epix.net!news.sprintlink.net!howland.reston.ans.net!vixen.cso.uiuc.edu!uicsl.csl.uiuc.edu!eagle.csl.uiuc.edu!gene
From: [e-mail] (Gene Gardner)
Newsgroups: rec.radio.amateur.homebrew
Subject: EASY CB-to-10M SSB
Date: 29 Aug 95 23:36:11 GMT
Organization: Coordinated Science Laboratory, University of Illinois at Urbana-Champaign
Lines: 92
Message-ID: <[e-mail]>
NNTP-Posting-Host: 128.174.58.11
Summary: Describes how to convert CB to 10M SSB
Keywords: CB to 10M SSB Conversion



CB-band to 10M band....I was pleasantly surprised at how simple it can be.
  I was especially interested in SSB for 10M since my son just got his
Tech-Plus license and can operate on 28.300 MHz to 28.500 MHz SSB (apparently
AM is illegal). His "wife's budget" only permitted something "cheap".
 I bought a couple of "working" SSB CB's for $20 each at a recent Hamfest...
 Midland model 79-892, and a Cobra 138.  The Midland uses a PLL-02A phase-
locked loop synthesizer to control the 40 channels, and the older Cobra uses
10 quartz crystal oscillators to control its 23 channels.
  I suspect there are dozens of other brands that have almost identical design.
I remember converting a 23-chan Kraco (AM) many years ago which used a PLL.
  I was fortunate enough to get service-info (SAMS PHOTOFACTS) thru our local
library....CB-180 (April 78) for the Midland, and CB-57 (Sept 74) for the
Cobra.It's a good feeling in our throw-away society, to be able to re-cycle some
of this great equipment of yester-year.
   Converting the Midland is quite simple..its PLL has nine control lines
capable of divide-by-n (1 to 512). The Midland only needs to divide by 255 thru
211 for Chan-1 thru Chan-40 respectively, so that the 256 line (pin 7) is
disabled permanently (grounded). Since a division of at least 211 is needed,
the 128 and 64 lines are always enabled (tied to +5), and the remaining six
lines (pins 10 thru 15) are switched by the Channel Selector dial to progress-
ively lower the count from 255 thru 211.
  These values may only apply to this model, or perhaps other Midland models....
they depend on choice of VFO and I.F. frequencies, and the down-shifted fre-
quencie offered to the PLL, which always divides-by-n to reach 10 KHz which
provides phase-locked-loop control, to force the VFO to move in 10 KHz steps.
  In this particular model for example, on Chan-30 the VFO runs at 38.000 MHz
mixed with an I.F. frequency of 10.695 MHz to provide the Chan 30 frequency of
27.305 MHz. (This is a good example because for converting to the Novice band,
we will want to start at exactly 1 MHz higher...at 28.305 MHz). In addition,
to down-shift the VFO for manageable frequencies for the PLL, it mixes it with
a fixed 40.210 MHz for a difference of 2.210 MHz (on chan 30). Dividing this
down to 10 KHz requires a divide-by-n of 221....of which div-by-192 is perm-
anently wired as described above (pin 7 LO, pins 8 & 9 HI), so that only an
additional div-by-29 is needed and the Channel selector knob supplys this (on
chan 30) by grounding pins 10 and 14, and enabling (to +5) pins 11, 12,13 and
15. Pins 7 thru 15 represent div-by: 256, 128, 64, 32, 16, 8, 4, 2 and 1, res-
pectively.
   As a side note, many people do not realize that below Chan 20, there are
five places that adjacent Channels actually jump 20 KHz, instead of 10KHz:
...i.e. between 3 & 4,  7 & 8,  11 & 12,  15 & 16,  19 & 20 ....all are separ-
ated by 20 kHz.  The remaining channels thru Chan 40 all have 10KHz separation.
   I hope all this expanded theory will be helpful in analyzing some of the
various models on the market.
  GETTING BACK TO HOW SIMPLE IT WAS TO MODIFY MY Midland 79-892, all I had to
do  was cut the PC-board foil to pin 8, then connect pin 8 to pin 7 (which was
already grounded). Then tweak the slug on the VFO counter-clockwise to raise
its frequency to 39.000MHz which raises the operating frequency to 28.305 MHz
as mentioned above....but if you are expecting to receive or transmit on
28.305 MHz, the Chan selector needs to be on Chan-6. The VFO can is the largest
shielded-can about 5/8" x 1 1/8"...much larger than any others...with the
ferrite slug on top.  Operation will not "pop in" until you tweak the VFO near
enough for the dc control voltage to capture contol of the VFO. Until then,
an out-of-lock signal will disable the system.  You can measure the dc control
voltage coming out of the PLL (IC-1, pin 5), and tweak the VFO until this
control-voltage centers at about 3.5v on Chan-12 (about the middle of the
Novice band) although it's not critical.  If you plan to operate higher than
28.500 MHz, you might want to center it on a higher channel.
   To summarize the theory of this example on the low end of the Novice band:
 VFO is at 39.000 MHz (1 MHz above CB-chan 30) and mixes with I.F. freq. of
10.695 MHz for a difference of 28.305.  For phase control, the 39.000 is also
mixed with a 40.210 MHz reference for a difference of 1.210 MHz which requires
a div-by-121 to reach 10 KHz. We had to ground pin 8 to avoid a minimum count
of 128 (we need 121 or less). We still have fixed divisor of 64 (pin 9 tied
HI), so the selector channel needs to supply an additional 57 which it does in
Chan-6 position by switching pins 10, 11, 12, 15 HI, and grounding 13 & 14.
    After these two simple changes, the radio came to life immediately. However
since I had the SAMS book with all the pictures to identify components, I went
thru and tweaked up the circuits that now operate at higher frequencies. It did
as you would expect improve considerably.  Those without documentation will
need to proceed carefully.  The inductors near the RF Power out and its driver
should be easy to identify without docs.
     Finally, I also mentioned an older 23-Chan Cobra model 135.  I have not
changed it over yet, but in analyzing the documentation, I feel certain it
would be easy to convert by simply replacing quartz crystal X10 (8.409 MHz)
with one 9.5 to 9.67 MHz ...a single crystal would provide four operating
frequencies. Each new crystal in that range would offer four more operating
frequencies.   In this model, the sum of two crytals (one from each group)
combined with the 7.8 MHz I.F. yields the operating frequency.
   Both models have the "clarifier" function in Receive, which shifts operating
frequency plus or minus....perhaps filling in most of the gaps in the channels
separated by only 10 KHz. If desired, it should be an easy task to modify this
same circuit to include shifting the Xmit frequency also.

I FORGOT TO MENTION that on the Midland modification, Chan-21 on the selector
yields the High end of the Novice band at 28.495 MHz. The dial limits should
be marked clearly, or perhaps a physical-stop on the older dials if only the
Novice band is intended.
--

Internet, BITNET: [e-mail]


From [e-mail] Thu Aug 31 17:09:55 1995
Path: grape.epix.net!news.sprintlink.net!in1.uu.net!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail
From: [e-mail] (W8JI  Tom)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Neon lamp question
Date: 29 Aug 1995 13:48:51 -0400
Organization: America Online, Inc. (1-800-827-6364)
Lines: 27
Sender: [e-mail]
Message-ID: <41vju3$[e-mail]>
References: <41v2ko$[e-mail]>
NNTP-Posting-Host: newsbf02.mail.aol.com
X-Newsreader: AOL Offline Reader

In article <41v2ko$[e-mail]>, [e-mail] (Jeff
Anderson) writes:

>   My questions are:
>
>        1.  Do all neon lamps have this same "ON" voltage?  If
>            not, are there standard "ON" voltages?
>
>        2.  Where can I find information on the "ON" voltage?
>            (I've looked in my Allied Electronics catalog, but
>            it was no help).
>
>Thanks,
>
>- Jeff, WA6AHL
>
>

Jeff,

No, they do not all have the same on voltage and yes there are some common
voltage lamps. You will have to look at the data from the lamp
manufacturer to get the on voltage, measure it, or find someone with the
data. My neon lamp catalogs are probably long gone now, but I will look
over the next day. Do you know the bulb number (like NE-2 or NE-1-- Etc?)

73 Tom


From [e-mail] Thu Aug 31 17:09:55 1995
Path: grape.epix.net!news.sprintlink.net!in2.uu.net!news.iii.net!iii1.iii.net!not-for-mail
From: [e-mail] (Thomas C Sefranek)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Neon lamp question
Date: 31 Aug 1995 13:12:20 -0400
Organization: iii.net
Lines: 14
Message-ID: <424qi7$[e-mail]>
References: <41v2ko$[e-mail]>
NNTP-Posting-Host: iii1.iii.net

Neon lamps are normally ignited by about 83 volts.
However several external/internal sources can cause them to ionize with
lower voltages.  Incident light, rf fields, radiation...
Some lamps have a micro radiation souce embeded in the lamp to
stabilize the ignition voltage.  These are almost all lower than the 83 volt
level.  The military lamps with an internal source often have/had warnings
about their disposal.

Perhaps this will help your problem in some way.

Tom

--
Thomas C. J. Sefranek  WA1RHP  Work: 508-425-2200


From [e-mail] Thu Aug 31 17:09:57 1995
Newsgroups: rec.radio.amateur.homebrew
Path: grape.epix.net!news.sprintlink.net!howland.reston.ans.net!ix.netcom.com!netcom.com!mzenier
From: [e-mail] (Mark Zenier)
Subject: Re: spark tx and VLF etc
Message-ID: <[e-mail]>
Organization: NETCOM On-line Communication Services (408 261-4700 guest)
References: <[e-mail]> <[e-mail]> <[e-mail]>
Date: Mon, 28 Aug 1995 19:58:26 GMT
Lines: 29
Sender: [e-mail]

in <[e-mail]>, Joseph Cooper wrote:
: I have been doing some research on these old VLF transmitters in the U.S., and
: would be interested to know if someone may have more detailed information on
: this, and others of its type.

: At this time the only station that may fit the discription outlined in the
: original email would be the Navy station NAA at Annapolis. I've seen it and it
: is impressive.

I dug out an old book I've got (circa 1928) and it says that NAA was a
500 kW arc transmitter, and the US Navy had a 1,000 kW arc transmitter at
Bourdeaux, France.  No more details than that, though.

As far as sending morse with an arc, it seems like there were more ways to
do it than there were parts in the transmitter.  Back Shunt keying used a
seperate non raditating tuned circuit and keying switched the arc voltage
between the antenna circuit and the back shunt circuit.  Ignition keying
used additional electrodes in the arc chamber to turn the arc on and off.
Compensation keying varied the inductance of the antenna circuit which
caused a frequency shift.  And Chopper keying used a motor driven
chopper-commutator in addition to the key to either cause a frequency or
amplitude modulation at an audio rate.

Keeping one of these things operating must have been a chore.  Making
sure the gap in the arc chamber was ok, the alcohol drip, the water cooling,
the antenna loading, ...   At least the radio room would have been warm.

Mark Zenier  [e-mail]  [e-mail]



From [e-mail] Thu Aug 31 17:09:58 1995
Path: grape.epix.net!news.sprintlink.net!in1.uu.net!bloom-beacon.mit.edu!news5.ner.bbnplanet.net!news3.near.net!bigboote.WPI.EDU!duck.WPI.EDU!jmhill
From: [e-mail] (Jonathan M Hill)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: spark tx and VLF etc
Date: 29 Aug 1995 16:25:58 GMT
Organization: Worcester Polytechnic Institute
Lines: 21
Distribution: world
Message-ID: <41vf2m$[e-mail]>
References: <41p214$[e-mail]> <41rj74$[e-mail]>
NNTP-Posting-Host: duck.wpi.edu

A few yeas back I visited Acadia National Park on Mount Desert Island in
Maine, USA.  In the park visitor's center I purchased a small booklet that
described a radio station that was operated by the Navy in 1911, on top of
Otter Cliffs, which is not too far from Bar Harbor.  The station call sign
was NBD.  I recall from my reading that the station used a quenched spark
gap, essentially alcohol was dripped right into the spark gap.....

Oh by the way, Worcester Polytechnic Institute (WPI) became active with a ham
radio club in 1909.  The club was licensed in 1913 as ``1YK,'' today we are
W1YK, so if you come accross either call sign in your literature, thats us.
I think that MIT and a small number of other schools also were active at that
time, maybe Rensellaer?  One story goes that back in those days the electrical engineering department at WPI had a working trolley car.  The ham radio clu
which was in the same building, connected their transmitter directly to the feedline used by the trolley car.  I am not the club historian, so sorry I am
not up on all the history.  Things at WPI are quite different today than they
were back then!

Lastly, I recall hearing about a wireless and steam engine museum in
Rhode Island.  If I manage to find the brochure, I'll make a posting.

                                                       73s,
                                                         Jonathan Hill/N1QOL


From [e-mail] Thu Aug 31 17:10:00 1995
Path: grape.epix.net!news.sprintlink.net!howland.reston.ans.net!vixen.cso.uiuc.edu!uicsl.csl.uiuc.edu!eagle.csl.uiuc.edu!gene
From: [e-mail] (Gene Gardner)
Newsgroups: rec.radio.amateur.homebrew
Subject: EASY CB-to-10M SSB
Date: 29 Aug 95 23:36:11 GMT
Organization: Coordinated Science Laboratory, University of Illinois at Urbana-Champaign
Lines: 92
Message-ID: <[e-mail]>
NNTP-Posting-Host: 128.174.58.11
Summary: Describes how to convert CB to 10M SSB
Keywords: CB to 10M SSB Conversion



CB-band to 10M band....I was pleasantly surprised at how simple it can be.
  I was especially interested in SSB for 10M since my son just got his
Tech-Plus license and can operate on 28.300 MHz to 28.500 MHz SSB (apparently
AM is illegal). His "wife's budget" only permitted something "cheap".
 I bought a couple of "working" SSB CB's for $20 each at a recent Hamfest...
 Midland model 79-892, and a Cobra 138.  The Midland uses a PLL-02A phase-
locked loop synthesizer to control the 40 channels, and the older Cobra uses
10 quartz crystal oscillators to control its 23 channels.
  I suspect there are dozens of other brands that have almost identical design.
I remember converting a 23-chan Kraco (AM) many years ago which used a PLL.
  I was fortunate enough to get service-info (SAMS PHOTOFACTS) thru our local
library....CB-180 (April 78) for the Midland, and CB-57 (Sept 74) for the
Cobra.It's a good feeling in our throw-away society, to be able to re-cycle some
of this great equipment of yester-year.
   Converting the Midland is quite simple..its PLL has nine control lines
capable of divide-by-n (1 to 512). The Midland only needs to divide by 255 thru
211 for Chan-1 thru Chan-40 respectively, so that the 256 line (pin 7) is
disabled permanently (grounded). Since a division of at least 211 is needed,
the 128 and 64 lines are always enabled (tied to +5), and the remaining six
lines (pins 10 thru 15) are switched by the Channel Selector dial to progress-
ively lower the count from 255 thru 211.
  These values may only apply to this model, or perhaps other Midland models....
they depend on choice of VFO and I.F. frequencies, and the down-shifted fre-
quencie offered to the PLL, which always divides-by-n to reach 10 KHz which
provides phase-locked-loop control, to force the VFO to move in 10 KHz steps.
  In this particular model for example, on Chan-30 the VFO runs at 38.000 MHz
mixed with an I.F. frequency of 10.695 MHz to provide the Chan 30 frequency of
27.305 MHz. (This is a good example because for converting to the Novice band,
we will want to start at exactly 1 MHz higher...at 28.305 MHz). In addition,
to down-shift the VFO for manageable frequencies for the PLL, it mixes it with
a fixed 40.210 MHz for a difference of 2.210 MHz (on chan 30). Dividing this
down to 10 KHz requires a divide-by-n of 221....of which div-by-192 is perm-
anently wired as described above (pin 7 LO, pins 8 & 9 HI), so that only an
additional div-by-29 is needed and the Channel selector knob supplys this (on
chan 30) by grounding pins 10 and 14, and enabling (to +5) pins 11, 12,13 and
15. Pins 7 thru 15 represent div-by: 256, 128, 64, 32, 16, 8, 4, 2 and 1, res-
pectively.
   As a side note, many people do not realize that below Chan 20, there are
five places that adjacent Channels actually jump 20 KHz, instead of 10KHz:
...i.e. between 3 & 4,  7 & 8,  11 & 12,  15 & 16,  19 & 20 ....all are separ-
ated by 20 kHz.  The remaining channels thru Chan 40 all have 10KHz separation.
   I hope all this expanded theory will be helpful in analyzing some of the
various models on the market.
  GETTING BACK TO HOW SIMPLE IT WAS TO MODIFY MY Midland 79-892, all I had to
do  was cut the PC-board foil to pin 8, then connect pin 8 to pin 7 (which was
already grounded). Then tweak the slug on the VFO counter-clockwise to raise
its frequency to 39.000MHz which raises the operating frequency to 28.305 MHz
as mentioned above....but if you are expecting to receive or transmit on
28.305 MHz, the Chan selector needs to be on Chan-6. The VFO can is the largest
shielded-can about 5/8" x 1 1/8"...much larger than any others...with the
ferrite slug on top.  Operation will not "pop in" until you tweak the VFO near
enough for the dc control voltage to capture contol of the VFO. Until then,
an out-of-lock signal will disable the system.  You can measure the dc control
voltage coming out of the PLL (IC-1, pin 5), and tweak the VFO until this
control-voltage centers at about 3.5v on Chan-12 (about the middle of the
Novice band) although it's not critical.  If you plan to operate higher than
28.500 MHz, you might want to center it on a higher channel.
   To summarize the theory of this example on the low end of the Novice band:
 VFO is at 39.000 MHz (1 MHz above CB-chan 30) and mixes with I.F. freq. of
10.695 MHz for a difference of 28.305.  For phase control, the 39.000 is also
mixed with a 40.210 MHz reference for a difference of 1.210 MHz which requires
a div-by-121 to reach 10 KHz. We had to ground pin 8 to avoid a minimum count
of 128 (we need 121 or less). We still have fixed divisor of 64 (pin 9 tied
HI), so the selector channel needs to supply an additional 57 which it does in
Chan-6 position by switching pins 10, 11, 12, 15 HI, and grounding 13 & 14.
    After these two simple changes, the radio came to life immediately. However
since I had the SAMS book with all the pictures to identify components, I went
thru and tweaked up the circuits that now operate at higher frequencies. It did
as you would expect improve considerably.  Those without documentation will
need to proceed carefully.  The inductors near the RF Power out and its driver
should be easy to identify without docs.
     Finally, I also mentioned an older 23-Chan Cobra model 135.  I have not
changed it over yet, but in analyzing the documentation, I feel certain it
would be easy to convert by simply replacing quartz crystal X10 (8.409 MHz)
with one 9.5 to 9.67 MHz ...a single crystal would provide four operating
frequencies. Each new crystal in that range would offer four more operating
frequencies.   In this model, the sum of two crytals (one from each group)
combined with the 7.8 MHz I.F. yields the operating frequency.
   Both models have the "clarifier" function in Receive, which shifts operating
frequency plus or minus....perhaps filling in most of the gaps in the channels
separated by only 10 KHz. If desired, it should be an easy task to modify this
same circuit to include shifting the Xmit frequency also.

I FORGOT TO MENTION that on the Midland modification, Chan-21 on the selector
yields the High end of the Novice band at 28.495 MHz. The dial limits should
be marked clearly, or perhaps a physical-stop on the older dials if only the
Novice band is intended.
--

Internet, BITNET: [e-mail]


From [e-mail] Thu Aug 31 17:10:01 1995
Path: grape.epix.net!news.sprintlink.net!howland.reston.ans.net!Germany.EU.net!netmbx.de!newsun.netmbx.de!netmbx.netmbx.de!gerhard
From: [e-mail] (Gerhard Hoffmann)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: wanted : fast, cheap 200 Mhz PLL
Date: 29 Aug 1995 19:21:10 GMT
Organization: netmbx GbR, Berlin, Germany
Lines: 16
Message-ID: <41vpb6$[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: netmbx2.netmbx.de

In article <[e-mail]>,
 <[e-mail]> wrote:

>        I need a fast, cheap, phase locked loop. One that can do 200 Mhz or so.
>One that is easy to get also. Can anyone recommend one? :-)

Try  Analog Devices AD9901.

Gerhard


--
#  Gerhard Hoffmann            #     phone: [phone]     #
#  Gleditschstr. 79            #     fax:   [phone]     #
#  D10823 Berlin               #     on the air:  dk4xp            #
#  Germany                     #     in the air:  d-1441, d-kick   #


From [e-mail] Thu Aug 31 17:10:02 1995
Path: grape.epix.net!news.sprintlink.net!howland.reston.ans.net!newsfeed.internetmci.com!solaris.cc.vt.edu!mkeitz
From: [e-mail] (Mike Keitz)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: How to make fox hunt target?
Date: Tue, 29 Aug 95 19:48:44 GMT
Organization: TSE Systems
Lines: 75
Message-ID: <41vqq0$[e-mail]>
References: <41vcos$[e-mail]>
NNTP-Posting-Host: mkeitz.beve.blacksburg.va.us
Keywords: fox, hunt, foxhunt, transmitter, controller
X-Newsreader: News Xpress Version 1.0 Beta #4

In article <41vcos$[e-mail]>,
   [e-mail] (Jonathan M Hill) wrote:
>Hi all;
>
>     I am at the very start of the planning of a fox-hunt transmitter
>system.  I would like to be able to put together in an inexspensive way,
>a transmitter for a fox hunt.  The transmitter may or may not be attended.
>I take it that since the transmitter is acting as a kind of beacon, most
>likely in say the 2 meter band, unattended operation should be legal.
>Does anyone know for sure?

If you classify the transmitter as a "propagation beacon", which seems
to me to be the most correct definition of its purpose, 97.203 says it is
legal to use under automatic control from 144.275 to 144.300 MHz, as long
as the power is less than 100 W, and you aren't in the 'snoop zone' near
Green Bank WV.


>     I have been considering using an old Icom handy-talkie for the
>transmitter, does anyone know of any control circuits that could be used
>to make an ordinary handy-talkie perform as a fox transmitter?
>I have been considering using a Motorolla 68HC11 microcontroller
>evaluation board as a fox controller.  If anyone has used this or any
>other microcontroller, I'd like to hear about it.

I believe there is a commercial unit to do just that.  On the other hand,
it is an excellent introductory microcontroller project.  The 68HC11 board
will easily handle the tasks of timing the duration of the transmission,
generating an ID sequence (in CW internally, or use one of those
voice-store chips), and keying the transmitter.  The simplest arrangement I
can think of, allowing on-off control and FM-MCW modulation would be:

            2.2K
PORT --------R1-----*--------------------ICOM Micorphone (Tip)
                    |
                   ---
                   ---  0.1 uF
          2.2K      |
PORT------R2--------*
                    |
                    R3 10 ohm
                    |
GND-----------------*--------------------ICOM Microphone (Ring)


Here, the first PORT, when driven low, will pull current thru R1, turning
the transmitter on. (If the microphone jack puts out more than 5V,
additional circuitry will be required).  The second PORT, driven with an
audio frequency square wave, allows tones to be transmitted.  The ratio of
R2 and R3 sets the level and may need to be adjusted.

Another way to do it would be to use a the beacon function of a TNC, this
serves the ID and timer functions well, but probably won't transmit long
enough to allow anyone to find it.  A simple circuit to stretch out the PTT
 so it transmits a period of dead air after the packet burst may be
feasible though.

>
>     If anyone knows of a simple two meter transmitter circuit that I
could
>use as an actual transmitter, that would be appreciated.  With such a
circuit,
>it would not be necessary to use an actual handy-talkie.  Remember that
this
>is just a fox transmitter and will be limited to CW mode on a single
>frequency.  Receiver too?

Building your own transmitter probably isn't justified unless (1) you would
like to, or (2) you consider the possibility of an expensive HT being lost
or stolen while left unattended high enough to justify it, or of course (3)
you don't have an extra HT.

Foxhunting receivers and antennas are another subject altogether.

-Mike KD4QDM


From [e-mail] Thu Aug 31 17:10:03 1995
Path: grape.epix.net!news.sprintlink.net!gatech!swrinde!sdd.hp.com!hp-pcd!news.vcd.hp.com!news
From: Don Huff <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: NEED HELP MAKING TV OSCILLATOR/JAMMER, SHORT RANGE
Date: 29 Aug 1995 19:45:50 GMT
Organization: Hewlett-Packard
Lines: 5
Message-ID: <41vqpe$[e-mail]>
References: <41m7tm$[e-mail]> <[e-mail]>
NNTP-Posting-Host: hpvcldu.vcd.hp.com
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 1.1N (X11; I; HP-UX A.09.05 9000/720)
X-URL: news:[e-mail]

A PROVEN SOLUTION IS A GRID-DIP METER.  I TOO HAVE PUT IT TO GOOD USE IN
MY APARTMENT-DWELLING DAYS.  MUTES THAT FM SOUND INSTANTLY.  BUT, WITH CABLE,
IT MAY NOT BE ENUFF SIGNAL TO DO THE JOB.  HOWEVER, IF THE CABLE SYSTEM (AND
/OR THE TV ITSELF) IS AS LEAKY AS MANY I HAVE SEEN, IT WILL WORK FINE!



From [e-mail] Thu Aug 31 17:10:06 1995
Path: grape.epix.net!news.sprintlink.net!howland.reston.ans.net!gatech!udel!rochester!cornellcs!travelers.mail.cornell.edu!news.kei.com!world!news.mtholyoke.edu!news.umass.edu!hamp!aswNS
From: [e-mail] (Albert S Woodhull)
Newsgroups: rec.radio.amateur.homebrew
Subject: TRW MX12-3 UHF amp info?
Date: 30 Aug 1995 00:35:08 GMT
Organization: Hampshire College, Amherst MA
Lines: 13
Message-ID: <420bns$[e-mail]>
NNTP-Posting-Host: newhamp.hampshire.edu
X-Newsreader: TIN [version 1.2 PL2]

AT a hamfest recntly I got what I hope will turn out to be a good deal
on a little amplifier for 440Mhz, which contains a "brick" marked TRW
MX12-3 440-470 Mhz. Can anyone send me specs on this circuit?

I also need advice on T/R switching for it. (next post)

73, Al N1AW

--
Albert S. Woodhull, Hampshire College, Amherst, MA
[e-mail]
[e-mail]
413-549-2962


From [e-mail] Thu Aug 31 17:10:07 1995
Path: grape.epix.net!news.sprintlink.net!in1.uu.net!usenet.eel.ufl.edu!col.hp.com!sdd.hp.com!nobody
From: [e-mail] (Mike Hoggatt)
Newsgroups: rec.radio.amateur.homebrew
Subject: Plans for solid state HF Linear
Date: 29 Aug 1995 23:14:56 GMT
Organization: Hewlett-Packard, San Diego Division
Lines: 5
Distribution: world
Message-ID: <42071g$[e-mail]>
NNTP-Posting-Host: hpsdlei5.sdd.hp.com

Anybody know a source or have plans for solid state HF Linear amp
(10M thru 80M) in the 600 watt range?

tnx
Mike, KN6IP


From [e-mail] Thu Aug 31 17:10:08 1995
Path: grape.epix.net!news.sprintlink.net!malgudi.oar.net!news.erinet.com!bug.rahul.net!a2i!sierra.net!brockway-d222.sierra.net!user
From: [e-mail] (Robert Tetrault)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Plans for solid state HF Linear
Date: Tue, 29 Aug 1995 21:47:48 -0700
Organization: Engineered Solutions
Lines: 17
Distribution: world
Message-ID: <[e-mail]>
References: <42071g$[e-mail]>
NNTP-Posting-Host: 204.94.234.222

In article <42071g$[e-mail]>, [e-mail] (Mike Hoggatt) wrote:

> Anybody know a source or have plans for solid state HF Linear amp
> (10M thru 80M) in the 600 watt range?
>
> tnx
> Mike, KN6IP

Write to Communications Concepts for catalog of the Motorola solid state
amp projects.  One of which is in that power range.  Comm Concepts will
sell kits and the original Motorola application note.

513 426 8600 vox
513 429 3811 fax

Good luck
RST


From [e-mail] Thu Aug 31 17:10:08 1995
Path: grape.epix.net!news.sprintlink.net!howland.reston.ans.net!vixen.cso.uiuc.edu!prairienet.org!w9sz
From: [e-mail] (Zack Widup)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Plans for solid state HF Linear
Date: 30 Aug 1995 13:38:32 GMT
Organization: University of Illinois at Urbana
Lines: 26
Message-ID: <421pko$[e-mail]>
References: <[e-mail]> <42071g$[e-mail]>
Reply-To: [e-mail] (Zack Widup)
NNTP-Posting-Host: firefly.prairienet.org


>
>> Anybody know a source or have plans for solid state HF Linear amp
>> (10M thru 80M) in the 600 watt range?
>>
>> tnx
>> Mike, KN6IP
>
>Write to Communications Concepts for catalog of the Motorola solid state
>amp projects.  One of which is in that power range.  Comm Concepts will
>sell kits and the original Motorola application note.
>
>513 426 8600 vox
>513 429 3811 fax
>
>Good luck
>RST
>
Also, get a copy of MOTOROLA RF DEVICES MANUAL (2 volumes now.) Many of
the application notes deal with solid state amps and combiners to get
larger powers out.

I'm not sure if CCI has them, but I know RF Parts in San Marcos, CA does.
Their phone # is 1-800-737-2787.

                                        Zack W9SZ


From [e-mail] Thu Aug 31 17:10:10 1995
Path: grape.epix.net!news.sprintlink.net!in2.uu.net!world!news.mtholyoke.edu!news.umass.edu!hamp!aswNS
From: [e-mail] (Albert S Woodhull)
Newsgroups: rec.radio.amateur.homebrew
Subject: T/R switching 440Mhz brick
Date: 30 Aug 1995 00:50:00 GMT
Organization: Hampshire College, Amherst MA
Lines: 33
Message-ID: <420cjo$[e-mail]>
NNTP-Posting-Host: newhamp.hampshire.edu
X-Newsreader: TIN [version 1.2 PL2]

I have a little 440 Mhz amplifier that uses an integrated "brick"
amplifier that was removed from some kind of equipment (so said the
OAOAseller). I need a T/R switch to make it really usable.

I had a Heathkit 2 meter amp that did T/R switching using 1/4 wave
lines connected across input and output and connected together and to
some diodes at the other end:

   in o-O===================-------====================O-o out
        |                    |   |                       |
        v                   ---  V                       v
amplifier input              ^  ---               amplifier output
                             |   |
                            ___ ___
                            /// ///

The idea is that the diodes effectively short the middle to ground
when r.f. is present and the 1/4 wave sections are isolated, but it is
just a 1/2 wave when receiving.

I would like to do something like this at 440 Mhz, but I don't know
exactly what design considerations I need to consider or how to test
it's really working right. I don't  want to blow up my amplifier.

Suggestions would be appreciated.

73, Al N1AW

--
Albert S. Woodhull, Hampshire College, Amherst, MA
[e-mail]
[e-mail]
413-549-2962


From [e-mail] Thu Aug 31 17:10:11 1995
Path: grape.epix.net!news.sprintlink.net!newsfeed.internetmci.com!news.uoregon.edu!newsadmin
From: Gary Davis <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Home-made low Ohm resistors
Date: 30 Aug 1995 00:35:38 GMT
Organization: University of Oregon
Lines: 16
Message-ID: <420boq$[e-mail]>
NNTP-Posting-Host: cisco-ts5-line32.uoregon.edu

I am building a high-amp, variable voltage power supply.  The heart
of the circuit is a LM317T voltage regulator, followed by several
series pass transistors (2N3055). The output of each transistor should
be followed by a .05 Ohm, 2 watt resistor.  Such resistors are not
readily available at Radio Shack.

Can anyone give me advice on how to custom build such resistors?
I have many high ohm, high watt resistors, but need to know how
many wraps of wire around the resistors are needed for .05 ohms?

Your help will be appreciated.

Thanks,

Gary Davis



From [e-mail] Thu Aug 31 17:10:11 1995
Path: grape.epix.net!news.sprintlink.net!howland.reston.ans.net!news-e1a.megaweb.com!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail
From: [e-mail] (W8JI  Tom)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Home-made low Ohm resistors
Date: 30 Aug 1995 02:23:14 -0400
Organization: America Online, Inc. (1-800-827-6364)
Lines: 24
Sender: [e-mail]
Message-ID: <42104i$[e-mail]>
References: <420boq$[e-mail]>
NNTP-Posting-Host: newsbf02.mail.aol.com
X-Newsreader: AOL Offline Reader

In article <420boq$[e-mail]>, Gary Davis
<[e-mail]> writes:

>
>Can anyone give me advice on how to custom build such resistors?
>I have many high ohm, high watt resistors, but need to know how
>many wraps of wire around the resistors are needed for .05 ohms?
>
>Your help will be appreciated.
>
>Thanks,
>
>Gary Davis

Gary,

In a power supply I designed commercially, I used long foil traces to
generate the resistance required. Perhaps you could use long emitter
hookup wires. 50 milliohms is not that hard to get either way. Another
nice thing is if a transistor hogs current, the resistance of the
conductor in it's emitter goes up a bit. That helps keep the current more
even. Sometimes temperature instability in a component can be a blessing.

73 Tom


From [e-mail] Thu Aug 31 17:10:12 1995
Path: grape.epix.net!news.sprintlink.net!dispatch.news.demon.net!demon!pinetree
From: [e-mail] (WB3U)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Home-made low Ohm resistors
Date: Thu, 31 Aug 95 05:45:46 GMT
Lines: 20
Message-ID: <[e-mail]>
References: <420boq$[e-mail]>
NNTP-Posting-Host: pinetree.microserve.com
X-NNTP-Posting-Host: pinetree.microserve.com
X-Newsreader: News Xpress Version 1.0 Beta #4

   Gary Davis <[e-mail]> wrote:

>The output of each transistor should be followed by a .05 Ohm, 2 watt
>resistor.  Such resistors are not readily available at Radio Shack.

Rather than building these, why not use emitter resistors, commonly
sold for use in high-power audio amplifiers?

These resistors are usually available in values down to 0.1 ohm, and
power levels of 1 watt and up.  Two of these in parallel would provide
the value you're looking for.

One supplier to check is MCM Electronics in Centerville, OH.  Their
number is [phone], or for product questions, [phone].
They also offer a free catalog.

73,

Jack  WB3U


From [e-mail] Thu Aug 31 17:10:13 1995
Path: grape.epix.net!news.sprintlink.net!howland.reston.ans.net!swrinde!sdd.hp.com!night.primate.wisc.edu!newsspool.doit.wisc.edu!news.doit.wisc.edu!runcible.macc.wisc.edu!rsmith
From: [e-mail] (Rusty Smith)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Home-made low Ohm resistors
Date: 31 Aug 1995 17:34:29 GMT
Organization: DoIT
Lines: 20
Distribution: world
Message-ID: <424rr5$[e-mail]>
References: <420boq$[e-mail]>
NNTP-Posting-Host: runcible.macc.wisc.edu
X-Newsreader: TIN [version 1.2 PL2]

Gary Davis ([e-mail]) wrote:
: I am building a high-amp, variable voltage power supply.  The heart
: of the circuit is a LM317T voltage regulator, followed by several
: series pass transistors (2N3055). The output of each transistor should
: be followed by a .05 Ohm, 2 watt resistor.  Such resistors are not
: readily available at Radio Shack.

: Can anyone give me advice on how to custom build such resistors?
: I have many high ohm, high watt resistors, but need to know how
: many wraps of wire around the resistors are needed for .05 ohms?

There is an excellent article on just this subject in this
month's Monitoring Times.

-

Rusty Smith                            Division of Information Technology
[e-mail]                   Network Engineering Group
rsmith@wiscmacc                        1210 W. Dayton St. Rm 3221
University of Wisconsin at Madison     Madison WI 53706 [phone]


From [e-mail] Thu Aug 31 17:10:15 1995
Newsgroups: rec.radio.amateur.homebrew
Path: grape.epix.net!news.sprintlink.net!news.bluesky.net!gatech!howland.reston.ans.net!newsfeed.internetmci.com!btnet!dispatch.news.demon.net!demon!uknet!bcc.ac.uk!news
From: [e-mail] (Dave Kirkby)
Subject: High power VHF/UHF amps - references
Sender: [e-mail] (Usenet News System)
Message-ID: <[e-mail]>
Date: Wed, 30 Aug 1995 14:26:30 GMT
Reply-To: [e-mail]
Organization: UCL Dept of Medical Physics
Lines: 105

Some time ago someone requested some references on highish power VHF amps. When I
started a project, I found a number of references that were useful. Anyone is
welcome to the following. By the way, if anyone is aware of any designs for
push-pull tetrode amplifers with grounded screens, please please let me know. Any
valve, any frequency (even audio)!

                                References.

1) 'Modern Circuit Design For VHF Transmitters', Barber et al, Part 1; CQ
November 1965, pages 30 - 34; Part 2 December 1965, pages 40 - 92.

2) 'A 2-KW PEP Amplifier for 144MHz.' Parts 1 and 2, E.L. Meade Jr.,
QST December 1973, pp 34 - 38 and Janurary 1974 pages 26-33.

3) 'High-Power Grounded-Grid  Amplifier for 144MHz.' VHF-UHF
Manual, G.R. Jessop, 4th edition, Chapter 5, pages 87 to 94. Radio Society
of Great Britain.

4) 'Design data for a Two-Kilowatt VHF linear', R.I.Sutherland, Ham
Radio, March 1969, pp6.

5) 'Design an amplifier around the 3CX1200A7', W.J.Byron, Ham Radio
December 1987, pages 33 - 42.

6) 'A high power 2m Amplifier Using the new 3CX800A7' D.D.Meacham,
QST April 1984, pp 11 to 15. Also see ARRL handbook 1991, chapter 31,
pages 46 to 50.

7) 'A 144-MHz Amplifier Using the 8874' R.F.Rinaudo, QST January
1972, pp24 to 29.

8) 'A Grounded-Grid Kilowatt Amplifier for 432 MHz', S.J. Powlishen,
QST October 1979, pp 11 - 14.

9) 'Improving the K1F0 8874 432MHz Amplifier', S. Powlishen, QST,
July 1987, pp20 - 23.

10) 'A 432-MHz, 1500-watt amplifier', F.J.Merry, Ham Radio, July 1985,
pp40 - 46.

11) 'New Ideas for the 2-meter Kilowatt', T.F. McMullen et al, QST
February 1971,  pages 24 to 30.

12) 'A high-Efficiency 2-Meter Kilowatt', QST February 1960, pp 30 - 33.
13) 'Top-Efficiency at 144Mc. With 4X250Bs' L.D. Breyfogle, QST
December 1961, pp 44 - 48.

14) 'High-power amplifier for 144MHz', VHF-UHF Manual, 4th Edition,
edited by G.R.Jessop,  Radio Society of Great Britain, chapter 5, pages 94
to 96.

15) 'Kilowatt Amplifiers for 50 amd 144Mc.' E.P. Tilton, QST February
1964 pp 11 - 142.

16) 'A practical Kiowatt Amplifier for 432MHz' A.T.Margot, QST August
1964, pp 47 - 50.

17) 'The W1QWJ 432-MC. Kilowatt Amplifer' QST February 1966, pp
11-144.

18) 'Some Hints on Push-Pull 432-MHz Power Amplifiers', Tilton, QST
February 1970, pp 44-45.

19) 'A Strip-Line Kilowatt Amplifier for 432MHz' R.T Knadle, Part 1,
QST April 1972, pages 49 to 55; Part 2, QST May 1972, pages 59 to 79.
See also 'Feedback' QST, July 1972, page 47.

20) 'A Coaxial-Tank Amplifier for 220 and 420Mc.', R.D.Brayley, QST
May 1951, pp39.

21)'Using the 4X250B on 144,220 and 432Mc', M.P.Southworth, QST
February 1957, pp31 to 132.

22) 'The perseids Powerhouse', C.M. Maer, QST October 1959, pages 33 -
 186.

23) 'Dual-Band Stripline Amplifier/Tripler for 144 and 432MHz.' R.T.
Knadle, Ham Radio, February 1970, pages 6 to 16.

24) 'VHF/UHF World', by J.Reisent,  Ham Radio, January 1985, pp 97,
and February 1985 page 38.

25) 'Care and Feeding of Power Grid Tubes' Eimac devision of Varian.

26) 'A Legal-Limit 2-Meter Tetrode Amplifier', The ARRL Handbook,
1991, chapter 31, pages 57 to 72.

27) 'VHF-UHF Manual', 3rd or 4th edition, Radio Society of Great Britain.

28) 'The ARRL UHF/Microwave Experimenters manual',1990, ARRL.

29) 'The UHF Compendium', K.Weiner, Parts 1 and 2,  Verlag Rudolf
Schmidt, 1982. English edition.

30) 'Parallel 4CX150B Amplifier for 144MHz', S. Gross, QST March
1975, pp 11.

31) 'A three-tube 4CX250B linear amplifier', D. Dobricic, Ham Radio,
April 1987, page 63 - 62.

32) 'High-power linear for 1296MHz', P.Laakman, QST August 1968, pp8 -
17





From [e-mail] Thu Aug 31 17:10:16 1995
Path: grape.epix.net!news.sprintlink.net!news.magicnet.net!news.supernet.net!news.cais.net!newsfeed.internetmci.com!howland.reston.ans.net!tank.news.pipex.net!pipex!in1.uu.net!emi.com!esol.intermedia.com!news
From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: RF Bridges
Date: Wed, 30 Aug 95 10:01:50 PDT
Organization: (None)
Lines: 5
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X-Newsreader: NEWTNews & Chameleon -- TCP/IP for MS Windows from NetManage


Does anyone have any information on the GR 1606A/B or the GR916 RF Bridges.
George Carlson, Email [e-mail]




From [e-mail] Thu Aug 31 17:10:17 1995
Newsgroups: rec.radio.amateur.antenna,rec.radio.amateur.homebrew
Path: grape.epix.net!news.sprintlink.net!tank.news.pipex.net!pipex!newsfeed.internetmci.com!news.msfc.nasa.gov!pendragon.jsc.nasa.gov!ames!news.hawaii.edu!uhunix3!dholmes
From: Daniel J Holmes <dholmes@uhunix3>
Subject: Re: Jamming LW Radio
In-Reply-To: <41kn0p$phu$[e-mail]>
X-Nntp-Posting-Host: uhunix3.its.hawaii.edu
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Sender: [e-mail]
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References: <41kn0p$phu$[e-mail]>
Mime-Version: 1.0
Date: Wed, 30 Aug 1995 17:44:11 GMT
Lines: 10
Xref: grape.epix.net rec.radio.amateur.antenna:13491 rec.radio.amateur.homebrew:9253

Jamming is illegal under US regulations. Find another past-time!:(

On 25 Aug 1995, David Lees wrote:

> Anyone any idea how I could Jam a radio Long Wave radio station
> (Atlantic 252 to be accurate)............
>
> Please help if you can!
>
>


From [e-mail] Thu Aug 31 17:10:18 1995
Path: grape.epix.net!news.sprintlink.net!tank.news.pipex.net!pipex!news.mathworks.com!newsfeed.internetmci.com!news.compuserve.com!news.production.compuserve.com!news
From: Bob Nuckolls, K0DYH <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew,sci.electronics
Subject: Looking for RF/Receivers guru
Date: 30 Aug 1995 22:34:36 GMT
Organization: AeroElectric Connection
Lines: 13
Message-ID: <422p1s$7nl$[e-mail]>
Xref: grape.epix.net rec.radio.amateur.homebrew:9255 sci.electronics:141669

Looking for an RF guru . . . . I need to design/fabricate the world's
worst wide band fm receiver at 1500 MHz.  I want to measure the center
frequency, deviation (up to +/-350KHz) and demodulate a 28KBits per
second data stream from a 2 watt transmitter in the same room!  I've
got a fair notion of how to synthesize the needed LO signals and
pipe them to a mixer/limiter.  I still need to develop a concept for
an FM discriminator with linear performance out to 350 KHz.

Anyone out there have some talents in this arena?

Thanks!

Bob Nuckolls, K0DYH, Wichita, KS


From [e-mail] Thu Aug 31 17:10:19 1995
Path: grape.epix.net!news.sprintlink.net!tank.news.pipex.net!pipex!howland.reston.ans.net!vixen.cso.uiuc.edu!uicsl.csl.uiuc.edu!eagle.csl.uiuc.edu!gene
From: [e-mail] (Gene Gardner)
Newsgroups: rec.radio.amateur.homebrew
Subject: more on EASY CB-10M SSB option
Date: 30 Aug 95 20:10:18 GMT
Organization: Coordinated Science Laboratory, University of Illinois at Urbana-Champaign
Lines: 30
Message-ID: <[e-mail]>
NNTP-Posting-Host: 128.174.58.11
Summary: adds another option to CB to 10M SSB conversion
Keywords: append CB-10M SSB



This will append the previous entry called EASY CB to 10M SSB: This offers
another nice option if it is to be used on Novice band only (This applies to
the Midland 79-892 model).  The PLL-02A IC offers the option of moving in
5 KHz steps, by simply grounding pin #4. In this case, pin #8 does not get
changed (stays high as it is originally).  We need the higher divide-count to
reach the 5 KHz phase reference (double the count required on 10KHz).
 The same instructions changing the VFO still apply. In this case, the 28.305
frequency is not available because of the glitch in selector switch which was
necessary to accomodate those "20 KHz step" exceptions. The lowest frequency
will now be 28.310 which corresponds to Chan-12. (Technically, 28.300 USB on
Chan-11 might be permitted, but I would not advise it). The operating frequency
moves in 5 KHz steps as the Channel selector is advanced (except for the 2 or 3
glitches where it advances 10 KHz). But there are not enough switch positions
to reach the high end of the Novice band so that Chan-40 corresponds to 28.460
MHz. With the smaller 5 KHZ steps, it is almost certain that the clarifier will
fill in the gaps with possible exception of the 10 KHz "glitch" channels.
  From looking at the schematic it appears to be a simple matter to add a
"Delta-Xmit" pot to shift the Xmitting frequency during Xmit only. Replace R-26
(10K) with a 100K pot...using two of its terminals and locate the pot in a
convenient location. Run a shielded line to replace R-26. Be sure to verify
which end of R-26 is ground. Add a 0.01 ufd across this location. This should
work well, because an almost identical circuit is used to place the "receive
clarifier" pot remotely in the Hand-mike.
     ...One small correction in the original article....at one place in the
text I mistakenly referred to a Cobra-135.  It is model Cobra-138.
--

Internet, BITNET: [e-mail]


From [e-mail] Thu Aug 31 17:10:20 1995
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From: [e-mail] (Syd Carlin)
Newsgroups: rec.radio.amateur.homebrew
Subject: PHONE OFF LINE INDICATOR
Date: Wed, 30 Aug 1995 18:35:16
Organization: Aztec Information Management
Lines: 8
Message-ID: <[e-mail]>
NNTP-Posting-Host: carlin.aztec.co.za
X-Newsreader: Trumpet for Windows [Version 1.0 Rev A]

Could someone send me a circuit for an off-line phone indicator that does not
require an external power supply but derives its power from the phone line.

Send info to my fax number:    27-21-5114457    (South Africa)

Thanks

Syd Carlin


From [e-mail] Thu Aug 31 17:10:21 1995
Path: grape.epix.net!news.sprintlink.net!howland.reston.ans.net!swrinde!sdd.hp.com!hpscit.sc.hp.com!rkarlqu
From: [e-mail] (Richard Karlquist)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Need source of custom CERAMIC Filters for 240kHz
Date: 31 Aug 1995 18:37:15 GMT
Organization: Hewlett-Packard
Lines: 20
Message-ID: <424vgr$[e-mail]>
References: <41m39s$[e-mail]> <[e-mail]> <424ii8$[e-mail]>
NNTP-Posting-Host: hpscrj.scd.hp.com

In article <424ii8$[e-mail]>,
Richard Karlquist <[e-mail]> wrote:
>
>
>BTW, on your 240 kHz. filter:  did you realize that 252 kHz. is a standard
>frequency (it's half of 455)?  Both Toko and Murata make that one.
>If you can QSY from 240 to 252, you're in business.
>
>Rick Karlquist N6RK
>Hewlett Packard
>[e-mail]


Correction to my previous posting.  The standard frequency is 262 kHz.
not 252 kHz., and it's no particular relationship to 455 kHz.  Does
anyone know how 262 came to be a standard IF anyway?  Only thing I can
figure is it is half of 525, which is the bottom of the AM radio band.
Any lower and you'd have a nasty 2nd order crossover spur in the mixer.

Rick


From [e-mail] Thu Aug 31 17:10:25 1995
Path: grape.epix.net!news.sprintlink.net!howland.reston.ans.net!ix.netcom.com!netnews
From: [e-mail] (au )
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: K Beep!<--Rooster Crowing sounds cooler.
Date: 31 Aug 1995 19:10:57 GMT
Organization: Netcom
Lines: 12
Message-ID: <4251g1$[e-mail]>
References: <41odia$[e-mail]>
NNTP-Posting-Host: ix-eug-or1-24.ix.netcom.com

In <41odia$[e-mail]> [e-mail]
(Andrew Taylor) writes:
>
>Hello, Id like to build an "roger beep"....can't seem to find
>any schematics anyplace.
>
>Id appreciate it if you can help me out!
>thanks
>Andrew T
>[e-mail]
>
Boy talk about flame bait!  Roger beep in ham area?


From [e-mail] Thu Aug 31 17:10:26 1995
Newsgroups: rec.radio.amateur.homebrew
Path: grape.epix.net!news.sprintlink.net!in1.uu.net!psinntp!psinntp!psinntp!psinntp!voder!nsc!news
From: "Al Koblinski  (W7XA)" <[e-mail]>
Subject: Re: Power Supply Capacitors
Content-Type: text/plain; charset=us-ascii
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References: <41sa36$[e-mail]>
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Yes,
They are pretty available at surplus stores.
Try  Fair Radio, Tucker, etc.  I think they advertise in the Ham
magazines as well as Popular Electronics type magazines.  Radio shack
also has some or can order through Allied Radio.
73, Al




From [e-mail] Thu Aug 31 17:10:27 1995
Path: grape.epix.net!news.sprintlink.net!dfw.nkn.net!virtual.nkn.net!user
From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Transmitting Loop Antenna
Date: Mon, 28 Aug 1995 22:52:21 -0600
Organization: National Knowledge Network
Lines: 36
Message-ID: <[e-mail]>
References: <41qtt9$[e-mail]>
NNTP-Posting-Host: 199.171.20.115

In article <41qtt9$[e-mail]>, "Darius Mostowfi, KE6IL"
<[e-mail]> wrote:

> Hi,
>
> I am building a 3'x3' loop for use on 40m - 15m. Does anyone know a good
> source for a split-stator variable cap, about 5-100pf or so?
>
> Is there anyone out there that can relate any experiences with these
> types of antennas?

> 73
  Darius


Darius et al,

I built the loop antenna described in 73 Magazine May 1995 issue. It is an
octagon shape made of 1/2 inch copper pipe and is about 4 feet in
diameter. It calls for a split stator variable (found at a hamfest) for
10-20 meters and homebrew capacitors (made of stacked pieces of pc board
and place in parallel) for 30 and 40. I haven't used it on 30 and 40 yet.
I have a MFJ 20m SSB rig that puts out 12 watts, maybe. I put the antenna
vertically on the ground. My first contact (from Texas) was a 59 into
Michigan. On field day I set up for about 45 minutes in the backyard and
got two Canadians, and a handful of QSO's including North Carolina, Ohio,
Nebraska and California. So it works very well. I don't think it would
take high power. But with a heavier capacitor or a vacuum variable and
beefier construction it would be great.

I'm thinking about making one with a 20-30 foot circumference, 1.5 inch
pipe and a vacuum variable for 40, 80 and maybe 160. Any advice on that
would be appreciated.

73
Rodger AB5VP


From [e-mail] Thu Aug 31 17:10:28 1995
Path: grape.epix.net!news.sprintlink.net!gatech!usenet.eel.ufl.edu!col.hp.com!sdd.hp.com!hp-pcd!news.vcd.hp.com!news
From: Don Huff <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Transmitting Loop Antenna
Date: 29 Aug 1995 19:56:35 GMT
Organization: Hewlett-Packard
Lines: 21
Message-ID: <41vrdj$[e-mail]>
References: <41qtt9$[e-mail]> <[e-mail]>
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X-URL: news:[e-mail]

The larger the circumfrence of your loop, the better it will perform.
The efficiency of small loops (6 ft circumfrence on 20m for example, like
AEA "Isoloop"), is very poor.  Expect 8-10 db below a dipole, if the loop
is totally in the clear, and many more db down if in awful locations like
next to buildings or (heaven forbid!) in an attic.  A circular loop will become
self-resonant at about 1/3 wavelength in circumfrence.
  See latest edition of Kraus's classic book "Antennas" for all the equations
you need to understand small loops.
  An octagon loop for 80 CW with 80 ft circumfrence, using 1 inch copper
sweated-joints pipe (about 25 ft diameter, not that large for an 80m antenna),
can have over 90 percent radiating efficiency.  Not bad for a small sized
antenna for that band!  Not to mention its low-noise receiving and QRM-nulling
capability (easy to mount as rotatable).
  The Q of an efficient loop is very high.  High enough to attenuate the
sidebands of a SSB signal.  This is the reason that efficient loops require
vacuum variable capacitors for tuning.  The peak voltage on the capacitor
can (and should)exceed 20KV at kilowatt levels of input power.

  GL, 73,
              Don W6JL



From [e-mail] Thu Aug 31 17:10:29 1995
Path: grape.epix.net!news.sprintlink.net!southwind.net!onyx!nuckolls
From: [e-mail] (Medicine River Press Inc.)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Transmitting Loop Antenna
Date: 31 Aug 1995 11:34:55 GMT
Organization: SouthWind Internet Access, Inc.
Lines: 12
Message-ID: <4246ov$[e-mail]>
References: <41qtt9$[e-mail]>
NNTP-Posting-Host: onyx.southwind.net
X-Newsreader: TIN [version 1.2 PL2]

Darius,

If you don't have them, go to a library and check the indexes (December
issues) of QST.  Over the past three or four years, there have been
several articles on this topic . .  including how to build your own
coaxial tuning capacitors.

73's

Bob . . .
K0DYH



From [e-mail] Thu Aug 31 17:10:30 1995
Path: grape.epix.net!news.sprintlink.net!nntpgate.primenet.com!nntpdist.primenet.com!russ
From: [e-mail] (Russell Gore)
Newsgroups: rec.radio.amateur.homebrew
Subject: Help with no-code survey..
Date: 29 Aug 1995 02:17:33 GMT
Organization: Primenet [phone]
Lines: 22
Message-ID: <41ttbt$[e-mail]>
NNTP-Posting-Host: usr5.primenet.com
X-Newsreader: TIN [version 1.2 PL2]

Thanks for reading this, my name is Russell Gore and I am a student at
DeVry Institute of Technology in Phoenix.  Part of my technical
writing class is a survey, please complete the following survey and mail
it back to me at [e-mail]    thanks..

What class of license do you hold?
Do you support the idea of no-code on HF?  Why?


******************************************************
Please send answer for the two questions to [e-mail]



--
*****************************************************************************
Russell  Gore   WL7AG   ||    Internet:  [e-mail]
8902 N 19th Ave apt2031 ||    Packet:   [e-mail]
Phoenix, AZ  85021      ||    Compuserve: 72377,2075
*****************************************************************************
Student at DeVry Institute of Technology in Phoenix, Arizona



From [e-mail] Thu Aug 31 17:10:31 1995
Path: grape.epix.net!news.sprintlink.net!howland.reston.ans.net!swrinde!ihnp4.ucsd.edu!news1.ucsd.edu!news-mail-gateway
From: [e-mail] (Komljanec, Tony)
Newsgroups: rec.radio.amateur.homebrew
Subject: Four-bay dipole array
Date: 29 Aug 95 17:20:00 GMT
Organization: ucsd usenet gateway
Lines: 19
Message-ID: <[e-mail]>
NNTP-Posting-Host: ucsd.edu
Originator: [e-mail]


I have two x Sinclair SRL 210-C2 VHF folded dipole arrays that I would like
to phase together to make a C4.  Because the mast is not continuous, as in a
C4 version, I can't exactly mount the entire antenna above the tower.
 Rather, the upper two dipoles will extend above the tower for an
unrestricted view, while the lower two dipoles will exist on the side of the
tower.  I'm using TV tower with an 11 inch face.

Question: When a mobile signal radiates from the back (tower) side of the
lower two dipoles,  the upper two dipoles will get a "better" view.  Can the
lower two dipoles act as a load (through the homebrew 2-way coaxial power
divider) and attenuate the desired mobile signal?

Rephrased:  Will this antenna arrangement work without too many undesired
nulls?

Regards,

Tony, VE3PEP


From [e-mail] Thu Aug 31 17:10:32 1995
Newsgroups: rec.radio.amateur.homebrew
Path: grape.epix.net!news.sprintlink.net!in1.uu.net!news.encore.com!psoper
From: [e-mail] (Pete Soper)
Subject: Maxim source needed and filter cascade question
Organization: Encore Computer Corporation
Date: Tue, 29 Aug 1995 14:19:18 GMT
Message-ID: <[e-mail]>
Sender: [e-mail] (Usenet News)
Nntp-Posting-Host: sysgem1.encore.com
Lines: 24

Hello Folks,

        Digikey is out of the MAX295 filter chip (for the state
variable filter design featured in "QST" recently). They couldn't predict
when they will get more stock.  Arrow is out of stock too (and has a
minimum quantity of 50 anyway).
        Could somebody point me to an alternative source for this part
that doesn't require a corporate account or large minimum order?
        Also, any pointers to a a source for the Maxim databook would be
great. I'm going with the MAX660 charge pump alternative for the -5
supply but don't have the details for this chip. Maxim's phone number
would be greatly appreciated.
        I'm also building a Wein bridge type notch filter. I can't decide
whether to arrange for this to be ahead of or behind the state variable
filter when it operates. I can take the empirical approach but wonder if
you wise heads out there know if one ordering would be clearly better than
another?

Regards,
Pete

-------------------------------------------------------------------------
Pete Soper KS4XG  ([e-mail]) 919 481 3730/voice 919 481 3868/FAX
Encore Computer Corp    901 Kildaire Farm Rd       Cary, NC 27511     USA


From [e-mail] Thu Aug 31 17:10:33 1995
Path: grape.epix.net!news.sprintlink.net!bga.com!ftp.unisql.com!unisql.unisql.com!news
From: Jim Strohm <jstrohm@blazer>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Maxim source needed and filter cascade question
Date: 29 Aug 1995 16:09:59 GMT
Organization: UniSQL, Inc.
Lines: 13
Message-ID: <41ve4n$[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: blazer.unisql.com
X-Newsreader: NCSA Mosaic


Maxim 1-800-998-8800
      1-800-722-8266

Distributors: Arrow, Bell, CAM RPC, Digi-Key, Elmo, Hamilton Hallmark,
Nu Horizons, and Zeus.

In NC and SC, EnVision is your authorized rep.  In VA, MicroComp.

Good luck

Jim N6OTQ



From [e-mail] Thu Aug 31 17:10:35 1995
Path: grape.epix.net!news.sprintlink.net!nwfocus1.wa.com!news.halcyon.com!usenet
From: Jay Wicklund <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Maxim source needed and filter cascade question
Date: Tue, 29 Aug 95 12:36:03 PDT
Organization: Northwest Nexus Inc.
Lines: 33
Message-ID: <[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: blv-pm3-ip20.halcyon.com
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X-Newsreader: NEWTNews & Chameleon -- TCP/IP for MS Windows from NetManage


In article <[e-mail]>, <[e-mail]> writes:

> Hello Folks,
>
>       Digikey is out of the MAX295 filter chip (for the state
> variable filter design featured in "QST" recently). They couldn't
> predict
> when they will get more stock.  Arrow is out of stock too (and has
> a minimum quantity of 50 anyway).
> Could somebody point me to an alternative source for this part
> that doesn't require a corporate account or large minimum order?
>       Also, any pointers to a a source for the Maxim databook
would be
> great. I'm going with the MAX660 charge pump alternative for the
-5
> supply but don't have the details for this chip. Maxim's phone
number
> would be greatly appreciated.

Try maxim direct.  They will sell small quantities via credit card
order.  1(800) 998-8800.  You can also get catalog at this number.


>
> Regards,
> Pete
>

Have a nice day....Jay Wicklund (KI7RH)





From [e-mail] Thu Aug 31 17:10:37 1995
Path: grape.epix.net!news.sprintlink.net!in2.uu.net!tank.news.pipex.net!pipex!dispatch.news.demon.net!demon!mail2news.demon.co.uk!lfheller.demon.co.uk
From: Leon Heller <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Maxim source needed and filter cascade question
Date: Tue, 29 Aug 95 19:38:46 GMT
Organization: Home
Lines: 30
Message-ID: <[e-mail]>
References: <[e-mail]>
Reply-To: [e-mail]
X-NNTP-Posting-Host: lfheller.demon.co.uk
X-Newsreader: Demon Internet Simple News v1.29

In article <[e-mail]> [e-mail] "Pete Soper" writes:

> Hello Folks,
>
>         Digikey is out of the MAX295 filter chip (for the state
> variable filter design featured in "QST" recently). They couldn't predict
> when they will get more stock.  Arrow is out of stock too (and has a
> minimum quantity of 50 anyway).
>         Could somebody point me to an alternative source for this part
> that doesn't require a corporate account or large minimum order?
>         Also, any pointers to a a source for the Maxim databook would be
> great. I'm going with the MAX660 charge pump alternative for the -5
> supply but don't have the details for this chip. Maxim's phone number
> would be greatly appreciated.
>         I'm also building a Wein bridge type notch filter. I can't decide
> whether to arrange for this to be ahead of or behind the state variable
> filter when it operates. I can take the empirical approach but wonder if
> you wise heads out there know if one ordering would be clearly better than
> another?

Maxim are *very* helpful with sample devices. You shouldn't have any
problems getting one of the MAX295s out of them, provided they aren't
out of stock, either.

Leon
--
Leon Heller, G1HSM                | "Do not adjust your mind, there is
E-mail [e-mail]  |  a fault in reality": on a wall
Phone: [phone]         |  many years ago in Oxford.


From [e-mail] Sun Sep 03 19:32:22 1995
Path: grape.epix.net!news.sprintlink.net!in1.uu.net!news.compulink.com!abyss!lethe!gts!westonia!humnet.humberc.on.ca!hduff
Subject: HF QRP wideband amp ???
Newsgroups: rec.radio.amateur.homebrew
From: [e-mail]
Date: Tue, 29 Aug 95 20:58:40 EST
Message-ID: <[e-mail]>
Organization: HumberNet LSS
Lines: 29




I am looking for a proven, known working wideband amplifer
design to take a DDS (direct digital synthesis) signal of a few
milliwatts up to 3 to 5 watts.
Operating range from 1.8 Mhz to 20 Mhz. The amplifier must be
stable, solid state with as low a parts count as possible.
( How's that for stingent specs !?)

I want to use my DDS as a (nearly) all-band QRP HF transmitter.
I will look after the required bandpass filtering.  I've seen some
designs that will deliver the required power but not a broadband
design that will cover most of the HF amateur bands.
If you have something that doesn't quite go 1.8 to 20 Mhz, I'd still
like to hear about it !

Thanks..Hugh Duff  VA3TO  Toronto


---
 ■ NFX v1.3 [000]

--
---------------------------------------------------------------------
  HumberNet LSS (Learning Support System) - Humber College, Toronto
     "Tomorrow's communication and learning environment, today"
          Visit our Website at http://humnet.humberc.on.ca/



From [e-mail] Sun Sep 03 19:32:24 1995
Path: grape.epix.net!news.sprintlink.net!howland.reston.ans.net!news.starnet.net!wupost!news1.inlink.com!usenet
From: [e-mail] (Gary V. Deutschmann, Sr.)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Neon lamp question
Date: 29 Aug 1995 22:08:56 GMT
Organization: Inlink
Lines: 47
Message-ID: <42035o$[e-mail]>
References: <41v2ko$[e-mail]>
NNTP-Posting-Host: slip11.inlink.com
Mime-Version: 1.0
Content-Type: Text/Plain; charset=ISO-8859-1
X-Newsreader: WinVN 0.99.5

In article <41v2ko$[e-mail]>, [e-mail] says...
>
>
>    I recently picked up an old HP voltmeter that uses Nixie tubes for
>the display (heck, it was cheap).  Internally, they use an interesting
>scheme of coupling the digital data to the nixies (high voltage) by
>using neon lamps and photoconductors - sort of an early optocoupler
>design.
>
>    The neon lamps used in this optocoupler are supposed to have an
>"ON" voltage of 55 volts dc.  I've found that a couple of digits in the
>readout "jump" about (from one value to another), and I've traced this
>instability back to the neon lamps.  Several of their "ON" voltages
>have drifted up to the 70 volt range, which, because of the circuit
>design, causes instability with a different neon lamp.
>
>    My questions are:
>
>        1.  Do all neon lamps have this same "ON" voltage?  If
>            not, are there standard "ON" voltages?
>
>        2.  Where can I find information on the "ON" voltage?
>            (I've looked in my Allied Electronics catalog, but
>            it was no help).
>
>Thanks,
>
>- Jeff, WA6AHL

Hi Jeff

Sorry, I no longer work at a place that has those data tables, but I do
remember that most NE lamps operate between 105 to 125 volts, but as you
found out their are exceptions.

The particular neon lamps you are referring to, and this is a wild guess,
are probably numbered NE83, NE86 or 5AH.
The NE83 and the 5AH are identical and their operating voltages are between
60 and 100 volts, whereas the NE86 is between 55 and 90 volts and probably
the bulb you are looking for.  It's life rating is only 2000 hours and
therefore needs replacing quite frequently.

Have fun finding one! ;-)

TTUL
Gary - N0ZOI



From [e-mail] Sun Sep 03 19:32:24 1995
Path: grape.epix.net!news.sprintlink.net!in1.uu.net!nwlink.com!tsunami.ixa.net!gandalf.compumedia.com!news
From: [e-mail] (Mark McDermott)
Newsgroups: rec.radio.amateur.homebrew
Subject: 900 MHz repeaters
Date: Wed, 30 Aug 1995 00:59:33 GMT
Organization: Hutton Communications
Lines: 8
Message-ID: <420j0j$[e-mail]>
NNTP-Posting-Host: rad.compumedia.com
X-Newsreader: Forte Free Agent v0.55

Has anyone built a 900 MHz repeater out there, if so what did you use
for the RXTX sections?

Mark N7TJP
--
Mark S. McDermott, P.E.  N7TJP
email: [e-mail]



From [e-mail] Sun Sep 03 19:32:26 1995
Path: grape.epix.net!news.sprintlink.net!howland.reston.ans.net!nntp.crl.com!crl14.crl.com!not-for-mail
From: [e-mail] (Donald J. Miller)
Newsgroups: rec.radio.amateur.homebrew,sci.electronics
Subject: Re: Looking for RF/Receivers guru
Followup-To: rec.radio.amateur.homebrew,sci.electronics
Date: 30 Aug 1995 18:14:19 -0700
Organization: CRL Dialup Internet Access        [phone]  [Login: guest]
Lines: 23
Message-ID: <4232db$[e-mail]>
References: <422p1s$7nl$[e-mail]>
NNTP-Posting-Host: crl14.crl.com
X-Newsreader: TIN [version 1.2 PL2]
Xref: grape.epix.net rec.radio.amateur.homebrew:9271 sci.electronics:141801

BobNuckolls wrote:
: Looking for an RF guru . . . . I need to design/fabricate the world's
: worst wide band fm receiver at 1500 MHz.  I want to measure the center
: frequency, deviation (up to +/-350KHz) and demodulate a 28KBits per
: second data stream from a 2 watt transmitter in the same room!  I've
: got a fair notion of how to synthesize the needed LO signals and
: pipe them to a mixer/limiter.  I still need to develop a concept for
: an FM discriminator with linear performance out to 350 KHz.

I don't know if this chip is still in general use today, but the NE568
PLL demod chip from Signetics (Now Phillips) used to be the standard
workhorse part for satelite FM Video receivers.

The usual IF frequency was 70 MHz, although the databook says that
operation at up to 150 MHz is possible.

Have fun!

--
-------------------------------------------------
Don Miller         My opinions are my own!
[e-mail]
-------------------------------------------------


From [e-mail] Sun Sep 03 19:32:28 1995
Path: grape.epix.net!news.sprintlink.net!nntpgate.primenet.com!news.asu.edu!aztec.asu.edu!ballnt
From: [e-mail] (John Ballentine)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: spark tx and VLF etc
Date: 30 Aug 1995 20:09:16 GMT
Organization: Arizona State University, Tempe, AZ (USA)
Lines: 31
Message-ID: <422ghc$[e-mail]>
References: <[e-mail]> <[e-mail]> <[e-mail]> <DDy9MM.7IC@westonia.
Reply-To: [e-mail] (John Ballentine)
NNTP-Posting-Host: aztec.asu.edu


In a previous article, [e-mail] (Mark Zenier) says:

>
>I dug out an old book I've got (circa 1928) and it says that NAA was a
>500 kW arc transmitter, and the US Navy had a 1,000 kW arc transmitter at
>Bourdeaux, France.  No more details than that, though.
>...
>
>Keeping one of these things operating must have been a chore.  Making
>sure the gap in the arc chamber was ok, the alcohol drip, the water cooling,
>the antenna loading, ...   At least the radio room would have been warm.
>
>Mark Zenier  [e-mail]  [e-mail]
>
>
There was an article in QST a year or so ago that mentioned some of the
arc transmitters. It said the 1 MWatt transmitter was built to maintain
communications between the US and the expeditionary force in France in WWI.
I got the impression it was never put into use. They mentioned some huge
electromagnets that were built for it, that were the largest ever built until
well after WWII. They were eventually used in some Physics research project.

They also mentioned a problem with the alcohol vapor. If the door to the arc
chamber was opened too soon after the arc was turned off, the air rushing in
would hit the alcohol vapor and the still hot surfaces and cause a flash of
fire. There were cases of radiomen being killed in these fires.

--
John Ballentine WB2SNB          Divina natura dedit agros,
Chandler, Arizona               ars humana aedificavit urbes.


From [e-mail] Sun Sep 03 19:32:29 1995
Path: grape.epix.net!news.sprintlink.net!in1.uu.net!news3.digex.net!digex.net!not-for-mail
From: [e-mail] (Gary Chatters)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Home-made low Ohm resistors
Date: 30 Aug 1995 20:52:32 -0400
Organization: Universal Access by Digital Express. 800-969-9090
Lines: 18
Message-ID: <42314g$[e-mail]>
References: <420boq$[e-mail]>
NNTP-Posting-Host: universe.digex.net

In article <420boq$[e-mail]>,
Gary Davis  <[e-mail]> wrote:
>I am building a high-amp, variable voltage power supply.  The heart
>of the circuit is a LM317T voltage regulator, followed by several
>series pass transistors (2N3055). The output of each transistor should
>be followed by a .05 Ohm, 2 watt resistor.  Such resistors are not
>readily available at Radio Shack.
>
>Can anyone give me advice on how to custom build such resistors?
>I have many high ohm, high watt resistors, but need to know how
>many wraps of wire around the resistors are needed for .05 ohms?
>

The ARRL Handbook has a table of properties of copper wire.
For example, 20 guage copper wire has a resistance of 10 milliohms
per foot.

gc


From [e-mail] Sun Sep 03 19:32:29 1995
Path: grape.epix.net!news.sprintlink.net!in1.uu.net!news.iadfw.net!usenet
From: [e-mail] (J. Fred Riley)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: 4CX1500B push-pull amplifer.
Date: Thu, 31 Aug 1995 08:34:12 -0700 (PDT)
Organization: Internet America
Lines: 12
Message-ID: <424ds7$[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: dal06-24.ppp.iadfw.net
X-Newsreader: Forte Free Agent v0.38

[e-mail] (Dave Kirkby) wrote:
>Anyone ever got a pair of 4CX1000A's running on 2m ??

There are lots on 100 MHZ and several friends have used them.  But
only in single-ended service.  The 1500B is much better than the 1000A
IFF you ever have a parasitic.

Push pull operation sounds like a way to start a diathermy machine.
But not an amplifier.

Fred



From [e-mail] Sun Sep 03 19:32:31 1995
Path: grape.epix.net!news.sprintlink.net!nwfocus1.wa.com!news.halcyon.com!usenet
From: [e-mail] (Gary P. Fiber)
Newsgroups: rec.radio.amateur.digital.misc,rec.radio.amateur.equipment,rec.radio.amateur.homebrew,rec.radio.amateur.misc
Subject: Re: Computer Control of Icom IC-R7100
Date: 31 Aug 1995 12:16:55 GMT
Organization: Northwest Nexus Inc.
Lines: 29
Message-ID: <42497n$[e-mail]>
References: <41qoge$[e-mail]>
NNTP-Posting-Host: blv-pm0-ip13.halcyon.com
X-Newsreader: WinVN 0.92.1
Xref: grape.epix.net rec.radio.amateur.digital.misc:10288 rec.radio.amateur.equipment:16484 rec.radio.amateur.homebrew:9276 rec.radio.amateur.misc:85844

In article <41qoge$[e-mail]>, [e-mail] (Allan Butler) says:
>
>                Hello,
>
>        I have a friend with one of these radios and he would like to
>build the interface and program his own computer to control the radio.
>The only problem that he has is that he cannot find the protocols that
>the radio uses to be controlled.  He would like to get the information
>that is needed to make the radio listen to the computer commands.  He is
>most interested in the data bits and the baud rate and what the actual
>commands are that need to be sent out the computer serial port.
>
>        Please respond via E-mail and here if you have an answer to this.
> He realizes that he could do the solution by throwing money at the
>problem but he wishes to do it the old fashioned way and do it himself.
>--
>                                                Allan Butler KA0IES

Allan,

Call ICOM America at 206-454-7619, press " 3 " when the automated system
answers.  You will then be connected with ICOM's parts dept.  They have a
manual titles the " CI-V Reference manual " for sale at a cost of about
$15.00 plus shipping.  This manual has the commands for the IC-R7100.
Newer ICOM radios now have the command set for the radio right in the
operators manual so it is doubtful the CI-V Reference Manual will ever
be updated

73' Gary


From [e-mail] Sun Sep 03 19:32:32 1995
Path: grape.epix.net!news.sprintlink.net!howland.reston.ans.net!vixen.cso.uiuc.edu!uwm.edu!fnnews.fnal.gov!nntp-server.caltech.edu!news.cerf.net!pagesat.net!a3bsrv.nai.net!mgate.arrl.org!news
From: Zack Lau <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: HF QRP wideband amp ???
Date: 31 Aug 1995 13:17:45 GMT
Organization: American Radio Relay League
Lines: 25
Message-ID: <424cpp$[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: mgate.arrl.org
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 1.1N (Windows; I; 16bit)
To: [e-mail]

[e-mail] wrote:
>
>
>
>I am looking for a proven, known working wideband amplifer
>design to take a DDS (direct digital synthesis) signal of a few
>milliwatts up to 3 to 5 watts.
>Operating range from 1.8 Mhz to 20 Mhz. The amplifier must be
>stable, solid state with as low a parts count as possible.
>( How's that for stingent specs !?)
>

You might consider the 1.8 to 54 MHz 5 watt amplifier in the
May 1992 issue of QEX.  It uses a MRF 137 running off 28 volts
for acceptable IMD performance.

Zack KH6CP/1
[e-mail]

Sept VHF Contest
Mt Equinox FN33KE @3810 ft.
73 7.1W  43 10.0N
50 MHz to 10 GHz SSB/CW/FM
Need just a few QSLs for 1296 VUCC...



From [e-mail] Sun Sep 03 19:32:33 1995
Path: grape.epix.net!news.sprintlink.net!ddi2.digital.net!usenet
From: [e-mail] (Russ Leblanc)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: NEED HELP MAKING TV OSCILLATOR/JAMMER, SHORT RANGE
Date: 31 Aug 1995 20:28:41 GMT
Organization: Hurricane DX Club
Lines: 27
Message-ID: <42561p$[e-mail]>
References: <41m7tm$[e-mail]> <[e-mail]>
NNTP-Posting-Host: @204.215.242.156
Mime-Version: 1.0
Content-Type: Text/Plain; charset=US-ASCII
X-Newsreader: WinVN 0.99.6

In article <[e-mail]>, [e-mail] says...
>
>SHACK 9529 ([e-mail]) wrote:
>: DOES ANYONE KNOW HOW TO MAKE AN OSCILLATION CIRCUIT THAT WILL INTERFERE
>: WITH TV. MY PURPOSE IS TO USE IT AS A JOKE DURING FOOTBALL GAMES AT A
>: FRIENDS HOUSE.
>: PLEASE HELP!   THANKS
>

>
>KA-f*****g BOOOOOOOOOOOOOOMMMMMMMMMMMMMMMMMMMMMM!
>
>The stereo never worked again...
>
>-Jeffy

Funny story.  A teacher who just happened to be a ham taught a
short intro electronics class when I was in sixth grade.  The feature
project was a tiny transmitter for jamming TV bcasts.  He'd instruct
us to mount it close to the twinlead and turn it on (this was long
before the advent of cable).

Of course, he suggested that we offer our services to fix the problem,
which consisted of sneakily recovering the jammer and subsequently
giving the neighbor a few good lines of techno-babble describing the
problem.  Thus demonstrating our electronic prowlness and "kindness". <g>



From [e-mail] Sun Sep 03 19:32:34 1995
Newsgroups: rec.radio.amateur.homebrew,sci.electronics
Path: grape.epix.net!news.sprintlink.net!in2.uu.net!psinntp!psinntp!psinntp!psinntp!atl.com!news
From: lewish (Lewis Hughes)
Subject: Re: Need info on Moto Hybrid RF Power amp.
Message-ID: <[e-mail]>
Keywords: Moto Hybrid Final RF AMP
Sender: [e-mail]
Nntp-Posting-Host: atl.com
Reply-To: [e-mail]
Organization: ADI
X-Newsreader: WinVN 0.99.2
References: <421u6t$[e-mail]>
Mime-Version: 1.0
Distribution: usa
Date: Thu, 31 Aug 1995 22:58:05 GMT
Lines: 44
Xref: grape.epix.net rec.radio.amateur.homebrew:9284 sci.electronics:141934

In article <421u6t$[e-mail]>, [e-mail] says...
>
>I've got a few Motorola Hybrid RF Power amplifiers of unknown
specification.
>They have the pinout of a MHW607, but their part number is XHW5066MOD.
Yes,
>that's XHW and not MHW.  I think that it is the final for a Moto
handheld
>in the mid VHF band.  I would like to use it in the 2m amateur band
(144-148).
>If it bears any resemblance to the 607, it will put out 7 to 10 Watts.
That
>would make a great module for homebrew designs.  1mW in, 10 W out!  Too
bad
>it takes > 2A at 7.5V, but I can live with it. :)
>
>If anyone knows the low down on this, please let me know.  Post or Email
>are both fine.  If there is interest, I'll post the results of my
search.
>If they prove useful, I'll tell where I got them.
>
>Thanks for any help!
>
>Cheers,
>David  N0YMV


The "X" in the part number means it was designed and manufactured by
Motorola Japan.  Not Motorola USA.  If you call Motorola in Arizona, they
will deny that such a part exists.  I know from past experience with a
different kind of part with an "X" prefix on the part number.

However, If you persist in asking for other departments in the Arizona
facility, you may eventually come across someone who will admit to
knowing about the part and can send you a spec sheet.  I can't recall the
name of the individual I finally talked to, but he was most helpful; all
the while claiming that he didn't know anything about it.

Hope this helps a little.

Regards,

Lewis