World of Ham Radio 1997/WOHR97_AmSoft_(1997-02-01).iso/usenets/1996_05/_homebre.txt

Text File | 1997-02-01 | 260KB | 7,154 lines

The World of Ham Radio CD-ROM



From [e-mail] Fri May 03 12:14:48 1996
From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Need Phone In-Use Light
Date: Wed, 01 May 96 01:24:17 PDT
Message-ID: <[e-mail]>
References: <[e-mail]>


In Article<[e-mail]>, <[e-mail]>
writes:



 > Does anyone a nifty circuit for a phone in-use indicator. The
indicator
 > can be LED, neon or whatever. I just need something to light at each
of
 > my phones that would tell the would-be phone user that the phone line
is
 > being used.
 >
 > I lose more connections to the Internet when either my wife or
daughters
 > picks up the phone and says sorry.
 >
 > I sure someone must have solved this problem without major rewining or
 > adding a dedicated line.
 >
 > Thanks,
 >
 > Dave
 > ---
 >   OLXWin 1.00a  MSI - Connecting The World (tm)
 >
 >
 >               .....oooooOOOOOo         http://www.intac.com/~cono
 >
 >       __,-----. ---+_________#_     The Roy Hobbs BBS [e-mail]
 >
 >      |________| |__|___________}          Node 1: 201-641-7307
 >
 >       ooooo oo ~ ooO-O-O-O == oo\         Node 2: 201-641-3126
 >
 >
 >
JADE Electronics makes one just as you described.  Its a kit
for $11.00.  A bit expensive but you only need to buy one
and clone the rest...
73
Scott



From [e-mail] Fri May 03 12:14:49 1996
From: Duck 1 <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Tube info needed
Date: Wed, 01 May 1996 03:36:22 -0700
Message-ID: <[e-mail]>
References: <[e-mail]> <4m4dj9$[e-mail]>

William W Janssen wrote:
>
> Duck 1 <[e-mail]> wrote:
> >Does anyone know of a good scorce for(or replacement for) 2E26 tubes?
> >HEEELLLLPPPPPP!
> >
>
> It would be helpful if I knew how many you want.
>
> Bill K7NOM

  OH! Thank you,
 I was a bit worried on this one. I need 3 purty bad, depending on
cost, perhaps 5 or 6. It's an old Motorola system, Getting very sick.
Any info - GREATLY APPRECIATED.
P.S. The 6146's aint so hot either.
         Regards, Duck 1,  [e-mail]



From [e-mail] Fri May 03 12:14:50 1996
From: [e-mail] (alap's mailbox)
Newsgroups: rec.radio.amateur.homebrew
Subject: 6 meter plans needed
Date: 1 May 1996 04:21:05 GMT
Message-ID: <4m6orh$[e-mail]>

Hello one and all, our local homebrew club is looking for a 6 meter
project to take on. We would like to find a good set of plans.

Thanks for everyones time

AL



 --
--------------------
[e-mail]


From [e-mail] Fri May 03 12:14:50 1996
From: [e-mail] (Kris Kasalo)
Newsgroups: rec.radio.amateur.homebrew
Subject: THINNING HAIR?....MINOXIDIL USERS?....
Date: 1 May 1996 05:26:14 GMT
Message-ID: <4m6slm$[e-mail]>

Now available in the U.S.  Pentadecanoic Acid Glyceride.  World's
leading treatments for thinning hair from Japan.  2.5X more
effective than minoxidil. Featured on CNN, NEWSWEEK,
New York Times.  Doctor recommended.  For free info,
please call 1-800-555-8655


From [e-mail] Fri May 03 12:14:51 1996
From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: HAIR LOSS?..OBSOLETE...Apologies
Date: 1 May 1996 13:05:36 GMT
Distribution: world
Message-ID: <4m7nj0$[e-mail]>

In article <4m7n4j$[e-mail]>, [e-mail] writes:

>
Apologies,

While sending multiple e-mails of this spam back to the originator I
inadvertently sent one to the group.

Dr. Gerry Butler,  CEng. MIEE. [[e-mail]]
TELTEC-TCD (Radio Propagation Planning), Trinity College,Dublin 2,Ireland
Dept. of Electronic and Electrical Engineering,
[ Dublin+Wicklow Mountain Rescue / EI0CH / EMT-D ]


From [e-mail] Fri May 03 12:14:52 1996
From: "Pierre-AndrΘ Rovelli" <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: (no subject)
Date: 1 May 1996 13:18:02 GMT
Message-ID: <4m7oaa$[e-mail]>
To: all

In the last issue of SPRAT, the G-QRP club journal, there was a description of
 a
very simple 80m DC CW Transceiver, the Pixie. It uses only one transistor as P
A in
TX and MIXER in RX. The PIXIE is based upon a design previously reviewed in SP
RAT,
the MICRO 80. I don't understand how it is possible, when applying the LO sign
al on
the base and the received signal on the collector of a bipolar NPN 2N4400
transistor, to produce the beat frequency on the emitter which is the AF signa
l to
be received. I have never seen before such a type of mixer using only 1 transi
stor.
Does anyone could help me to understand how works this very basic DC RX.

Pierre-Andre HB9FMN G-QRP 8360
[e-mail]



From [e-mail] Fri May 03 12:14:53 1996
From: "Pierre-AndrΘ Rovelli" <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: (no subject)
Date: 1 May 1996 13:19:11 GMT
Message-ID: <4m7ocf$[e-mail]>
To: all

In the last issue of SPRAT, the G-QRP club journal, there was a description of
 a
very simple 80m DC CW Transceiver, the Pixie. It uses only one transistor as P
A in
TX and MIXER in RX. The PIXIE is based upon a design previously reviewed in SP
RAT,
the MICRO 80. I don't understand how it is possible, when applying the LO sign
al on
the base and the received signal on the collector of a bipolar NPN 2N4400
transistor, to produce the beat frequency on the emitter which is the AF signa
l to
be received. I have never seen before such a type of mixer using only 1 transi
stor.
Does anyone could help me to understand how works this very basic DC RX.

Pierre-Andre HB9FMN G-QRP 8360
[e-mail]



From [e-mail] Fri May 03 12:14:54 1996
From: "Pierre-AndrΘ Rovelli" <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: (no subject)
Date: 1 May 1996 13:20:12 GMT
Message-ID: <4m7oec$[e-mail]>
To: all

In the last issue of SPRAT, the G-QRP club journal, there was a description of
 a
very simple 80m DC CW Transceiver, the Pixie. It uses only one transistor as P
A in
TX and MIXER in RX. The PIXIE is based upon a design previously reviewed in SP
RAT,
the MICRO 80. I don't understand how it is possible, when applying the LO sign
al on
the base and the received signal on the collector of a bipolar NPN 2N4400
transistor, to produce the beat frequency on the emitter which is the AF signa
l to
be received. I have never seen before such a type of mixer using only 1 transi
stor.
Does anyone could help me to understand how works this very basic DC RX.

Pierre-Andre HB9FMN G-QRP 8360
[e-mail]



From [e-mail] Fri May 03 12:14:55 1996
From: "Pierre-AndrΘ Rovelli" <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: (no subject)
Date: 1 May 1996 13:20:21 GMT
Message-ID: <4m7oel$[e-mail]>
To: all

In the last issue of SPRAT, the G-QRP club journal, there was a description of
 a
very simple 80m DC CW Transceiver, the Pixie. It uses only one transistor as P
A in
TX and MIXER in RX. The PIXIE is based upon a design previously reviewed in SP
RAT,
the MICRO 80. I don't understand how it is possible, when applying the LO sign
al on
the base and the received signal on the collector of a bipolar NPN 2N4400
transistor, to produce the beat frequency on the emitter which is the AF signa
l to
be received. I have never seen before such a type of mixer using only 1 transi
stor.
Does anyone could help me to understand how works this very basic DC RX.

Pierre-Andre HB9FMN G-QRP 8360
[e-mail]



From [e-mail] Fri May 03 12:14:56 1996
From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: (no subject)
Date: 1 May 1996 13:23:10 GMT
Message-ID: <4m7oju$[e-mail]>
To: all

In the last issue of SPRAT, the G-QRP club journal, there was a description of
 a
very simple 80m DC CW Transceiver, the Pixie. It uses only one transistor as P
A in
TX and MIXER in RX. The PIXIE is based upon a design previously reviewed in SP
RAT,
the MICRO 80. I don't understand how it is possible, when applying the LO sign
al on
the base and the received signal on the collector of a bipolar NPN 2N4400
transistor, to produce the beat frequency on the emitter which is the AF signa
l to
be received. I have never seen before such a type of mixer using only 1 transi
stor.
Does anyone could help me to understand how works this very basic DC RX.

Pierre-Andre HB9FMN G-QRP 8360
[e-mail]



From [e-mail] Fri May 03 12:14:56 1996
From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: test
Date: 1 May 1996 13:42:50 GMT
Message-ID: <4m7poq$[e-mail]>

test



From [e-mail] Fri May 03 12:14:58 1996
From: [e-mail] (Tom Randolph)
Newsgroups: rec.radio.amateur.homebrew
Subject: Xtal filters - distortion, etc.
Date: 1 MAY 96 15:55:11
Message-ID: <4m8gcm$[e-mail]>


In search of my current Holy Grail, a higher performance receiver, I ask: Can
anyone enlighten me a bit and perhaps give some article pointers re: what
happens to signals on their way through crystal filters? It would be nice if
there was a way to get somthing like "noise figure" and "output intercept"
numbers, however crude.

The next question is... after processing through the crystal filter, is it
worth worrying about noise, IMD and such in the IF amps, or does the filter
turn your signals to mush, so it doesn't really matter as long as the amps are
decent? I am aware of the practice of putting in another filter before the
product detector to limit noise bandwidth.

==============================================================================
Tom Randolph  N1OOQ  NE-QRP 419  QRP-L 87  ARRL      [e-mail]
==============================================================================


From [e-mail] Fri May 03 12:14:59 1996
From: [e-mail] (QRPBOOK)
Newsgroups: rec.radio.amateur.homebrew
Subject: Electronics Data Book to be released
Date: 1 May 1996 17:07:42 -0400
Message-ID: <4m8jqu$[e-mail]>
Reply-To: [e-mail] (QRPBOOK)

The Electronics Data Book for Homebrewers and QRP Yellow Pages is about to
be released.  The book highlights a number of popular QRP transceivers and
also includes many data sheets featuring specific components as well as
pages on capacitors, resistors and much more.  It is a "must" for all
amateur radio operators, electronics hobbyists and technicians.  192 pages
spiral bound to lay flat on the bench.

The book will be released May 16 in Dayton at the QRP Symposium and will
be sold in space 3405.  Mail orders will be shipped May 16 (U.S.) and May
13 (foreign).

A special introductory price of $17.50 postpaid U.S. and $19.50 postpaid
foreign will be in effect until 31 August, 1996.  September 1 the price
will be $23 postpaid U.S. and $25 postpaid foreign.  Visa, MasterCard and
Discovery cards accepted.  Make checks payable to Five Watt Press.
Colorado residents add sales tax.  Colorado QRP Club members receive a
$2.00 discount.

For order form by e-mail, send a note to [e-mail] or to Five Watt
Press  740 Galena Street, Aurora, CO 80010-3922.   Fax:  [phone].

Dealers set to date:
U.S.:  Gateway Electronics (3 locations)
Kanga U.S.

Europe:
G-QRP Club c/o G0OKY

Australia:
CW OPs QRP Club

Dealers will have books after the Dayton Hamvention.

If you have the ARRL Handbook, this book is a necessity. You will not find
any other book like it.


From [e-mail] Fri May 03 12:15:01 1996
From: [e-mail] (Robert Grauman)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Anti-freeze in CanTenna???
Date: Wed, 1 May 1996 19:44:10 mountain
Message-ID: <[e-mail]>
References: <[e-mail]> <4m4isk$[e-mail]>

In article <4m4isk$[e-mail]> [e-mail] (WB
3U) writes:
>From: [e-mail] (WB3U)
>Subject: Re: Anti-freeze in CanTenna???
>Date: Tue, 30 Apr 96 07:19:06 GMT

>Post / CC by Mail

>  [e-mail] (Ed Ganger) wrote:

>>If I can't be convinced about antifreeze, what other options are
>>there for a coolant?

>>"mineral oil" from a pharmacy?

>Mineral oil was the factory choice in devices like the Cantenna. I can
>remember specifically reading warnings about not using motor oil for
>this, although I don't remember the reason.

>>(I would _really_ like to stay away from oil though ... it is
>>almost impossible to clean up!)

>Ethelyene glycol isn't much better and I don't know *anyone* who
>has used it for this purpose (maybe because it's poison)?

>My advice is to use the oil.

>73,
>Jack  WB3U

The reason for not using motor oil is that it contains a detergent which will
absorb water, decreasing the resistance and arc over distance of the oil.  Use

pure mineral oil.  if water gets into the Cantenna, the water will collect on
the bottom, and not cause as many problems as if it were absorbed by the oil.

It seems to me that antifreeze would not be a good choice.  If you can't get
mineral oil, try hydraulic jack oil at an auto parts store.  Most of the stuff

I've seen is pure mineral oil.

                                73
                                RJG VE6BEJ


From [e-mail] Fri May 03 12:15:02 1996
From: [e-mail] (Pedro Pedroso)
Newsgroups: rec.radio.amateur.homebrew
Subject: 813 Power ! How Much ???
Date: 2 May 1996 10:03:23 GMT
Message-ID: <4ma19b$[e-mail]>


        Hello all !
        I've got a pair of 813 tubes, and I'm planning to build a
        linear amp. to use on 160 to 10 meters band.
        All I want to know is How much power can this tube provide and
        what is the correspondent plate voltage to be used !

                                                thanks !
 | Pedro Pedroso                        |                            |
 | [e-mail]               |  CT1ELP                    |
 | Eng. Electrotecnica e Computadores   |  Founder member of GPDX    |
 | (Telecomunicacoes e electronica)     |                            |
 ---------------------------------------------------------------------
 | Address: P.O.Box 116 , 2806 Almada Codex , PORTUGAL               |
 ---------------------------------------------------------------------


From [e-mail] Fri May 03 12:15:03 1996
From: (Gary) [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Anti-freeze in CanTenna???
Date: 2 May 1996 11:27:33 GMT
Message-ID: <4ma675$[e-mail]>
References: <[e-mail]>

I've used non detergent 30 weight motor oil for 4 years in my
cantenna. I've used power levels up to 2300 watts for short periods
of time with no problems.


                                             "73" Gary KF9CM



From [e-mail] Sat May 04 15:46:00 1996
From: [e-mail] (Pedro Pedroso)
Newsgroups: rec.radio.amateur.homebrew
Subject: 813 Power ! How Much ???
Date: 2 May 1996 10:03:23 GMT
Message-ID: <4ma19b$[e-mail]>


        Hello all !
        I've got a pair of 813 tubes, and I'm planning to build a
        linear amp. to use on 160 to 10 meters band.
        All I want to know is How much power can this tube provide and
        what is the correspondent plate voltage to be used !

                                                thanks !
 | Pedro Pedroso                        |                            |
 | [e-mail]               |  CT1ELP                    |
 | Eng. Electrotecnica e Computadores   |  Founder member of GPDX    |
 | (Telecomunicacoes e electronica)     |                            |
 ---------------------------------------------------------------------
 | Address: P.O.Box 116 , 2806 Almada Codex , PORTUGAL               |
 ---------------------------------------------------------------------


From [e-mail] Sat May 04 15:46:01 1996
From: (Gary) [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Anti-freeze in CanTenna???
Date: 2 May 1996 11:27:33 GMT
Message-ID: <4ma675$[e-mail]>
References: <[e-mail]>

I've used non detergent 30 weight motor oil for 4 years in my
cantenna. I've used power levels up to 2300 watts for short periods
of time with no problems.


                                             "73" Gary KF9CM



From [e-mail] Sat May 04 15:46:02 1996
From: [e-mail] (Bob Duckworth)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Need Phone In-Use Light
Date: 2 May 1996 16:01:17 -0400
Message-ID: <4mb4ad$[e-mail]>
References: <[e-mail]> <[e-mail]>

In article <[e-mail]>,
 <[e-mail]> wrote:
>
>In Article<[e-mail]>, <[e-mail]>
>writes:
>
> > Does anyone a nifty circuit for a phone in-use indicator. The
>indicator
> >
>JADE Electronics makes one just as you described.  Its a kit
>for $11.00.  A bit expensive but you only need to buy one
>and clone the rest...
>73
>Scott
>

Or you can put a diac in each line.
If one phone is off hook, there won't be enough
voltage to turn on the diacs at the other phones on.
The end result being that you can only use one phone
at a time.
-bob

--
Bob Duckworth Consulting, 960 Ralph McGill Blvd. Atlanta GA 30306-4447
bobs' address is [e-mail]    404-888-0389(V) 892-2301(FAX)
Buy Sell Trade Surplus Computer Electronics Datacom Telecom since 1981.
Fax or email your list for a fast cash offer. Watch for listserv catalog.


From [e-mail] Sat May 04 15:46:03 1996
From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: Information Needed!
Date: 3 May 96 02:39:58 GMT
Message-ID: <[e-mail]>

Hi all.

I still looking for information at the following items:

- CELLULAR PHONE PWR MODULE, LABELED FMC080802-20, REMOVED FROM A
  NEC CELL-PHONE.
- 2SC1251, A NEC TRANSISTOR (SUPOSE TO BE A CLASS A UHF DRIVER, I THINK
  I SAW IT AT SOME MOTOROLLA DATABOOK SOME YR AGO)
- IF THERE IS ANY CODE TO SMD TRANSISTOR AND DIODES/MIXERS SIMILLAR
  TO THE ONE WE USE TO SMD (CAPACITORR AND RESISTORS).
- ANY SOURCE FOR SAW-FILTERS, 455KHZ OR 10.7MHZ, 40khz BW(NOAA/GOES/
  METEOSAT DEVIATION).
- HRPT INFORMATION/SOFTWARE SOURCES.
- PATCH ANTENNAS THEORY (AND THEIRS YAGI-LIKE ASSEMBLY, SUCH AS USED TO
  MMDS LNBY COMBINATION)

AND MORE:

- ANY RESULTS USING STANDARD TVRO KU-BAND FEEDERS AT 10.25GHz ASSOCIATED
  TO THOSE 0.6...2.4 METER DISHES(0,33...0.36 F/D)?
- HOME-MADE FERRITE CIRCULATOR TO IN A 10.25GHz WAVEGUIDE: TO ALLOW MO-
  DIFIED KU-BAND LNB AND GUNNPLEXER CONECTION(DUAL-PORT...)?
- ANY SUGESTION TO BUILD A 1.2/2.4GHz DIRECTIONAL COUPLERS, STRIP-LINE
  ON PCB + SMA CONN + SMD BALANCE RESISTORS (-20...-30dB COUPLING
  FACTOR)? MAY BE A MODEL 43 PLUS THE CORRECT PLUG-IN DETECTORS...BUT
  HERE? THE DETECTOR WILL BE A TEKTRONIX 2714 SPECTRUM ANALYZER!

  THANKS IN ADVANCE!

73 - Marcus Ramos - [e-mail] - Sao Paulo - Brasil


From [e-mail] Sat May 04 15:46:05 1996
From: [e-mail] (Douglas R Davis)
Newsgroups: rec.radio.amateur.homebrew
Subject: Some Antenna Trim Caps
Date: 3 May 96 07:09:36 GMT
Message-ID: <[e-mail]>
References: <[e-mail]>


Antenna Trim Caps
10-90pF, 50V trim cap used to match antennas in auto radios, CB'ss,
transceivers, etc., 15/16" tall
X 1/2" wide with a 6-32 mounting hole. Stock# 0823-VC, 4?$1.00

Marlin P. Jones
P O Box 12685
Lake Park FL 33403-0685

407-848-8236
Order FAX 1-800-4 FAX YES


From [e-mail] Sat May 04 15:46:06 1996
From: [e-mail] (W8JI  Tom)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Grid Driven 4-1000
Date: 3 May 1996 13:12:40 -0400
Message-ID: <4mdeq8$[e-mail]>
References: <4mccop$[e-mail]>

Hi All,

The correct AB1 formula for a simple shunt grid resistance is: R=
Eg^2 / 2Pdrv

A 50 ohm L pad can be calculated using ohm's law: .707bias / sqrt(p/50) =
Rgrid.  The input series R would of course be: 50 - Rgrid = Rs

With 90 watts and 56 volts of bias,  30 ohms of grid-cathode shunt
resistance fed by a series 20 ohm resistor would provide both proper grid
resistance and exciter loading.

Years ago I ran a pair of grid driven 4-1000A tubes, but scrapped the idea
because of tuning and adjustment difficulties. AB1 grid driven amplifiers
are tough to tune correctly, even the slightest amount of grid current or
improper loading makes them poor IMD performers.

I eventually tried to run the 4-1000A's in the Collins circuit used in the
30L1, but was unsucessful due to less than sufficient catode to anode
shielding. The only circuit that worked well was conventional grounded
grid with screen and grid bias applied. There was some slight performance
improvement over no screen or grid bias in grounded grid.

As with any tetrode, screen regulation and grid current in both grids was
critical. As time passed I scrapped the 4-1000's in favor of a grounded
grid triode. IMD performance and ease of adjustment improved greatly with
this move.

Looking back on it all, there was almost no advantage for all the effort
in building the screen and bias supply in the cathode driven 4-1000
configuration, althought it was easy to use and relatively clean even when
slightly mistuned. The thing I wanted awas more power gain, but gain
barely increased over a conventional grounded grid circuit with no screen
or grid bias voltages.

The grid driven configuration gave greatly improved power gain, but was
pretty fussy to tune properly on SSB. The largest problem was creation of
IMD even when scope and meters appeared correct. I think the Collins
circuit (used in the 30S1 4CX1000 amp) would have been the best circuit
but the poor screen grid shielding in the 4-1000A's made regeneration a
problem.

There are pros and cons to every circuit, and I guess the best choice
depends on user goals. But the 4-1000A is a far cry from the 4CX1000 in
operation and stability.

73 Tom


From [e-mail] Sat May 04 15:46:07 1996
Newsgroups: rec.radio.amateur.homebrew
From: [e-mail] (SARUMAN)
Subject: Schematic for DTMF decoder
Message-ID: <[e-mail]>
Date: Sat, 4 May 1996 00:05:15 GMT

Hi all, anyone have a schematic for a DTMF decoder? I'm looking for something
with a LCD display to Translate and show DTMF's. Thanx


<tsb>
                               Midgard Graphics
           3D Animation and Special FX for the hobbyist videographer
                          Email: [e-mail]

--
          Drop into #amigacafe on IRC's undernet for a chat sometime

--

<tsb>

                     A man of many hobby's master of none.




From [e-mail] Tue May 07 19:41:00 1996
Date: 3 May 1996 07:45:36 EDT
Newsgroups: rec.radio.amateur.homebrew
From: [e-mail] (Hugh Duff)
Message-ID: <[e-mail]>
References: <[e-mail]>
Subject: Re: Wind up radio


> VE7KNL Clinton Peebles wrote:
> >
> > A couple weeks ago I heard a story on CBC radio about a wind up radio
> > being manufactured in South Africa.  Are these available in North
> > America?  I'd like to get one.  Maybe get the spring and generator out
> > of one and make a wind up QRP rig.
>
> Yes, Charles Lukey posted to rec.radio.swap
> Windup Technology 206-783-2880  FAX [phone]
> 1-888-946-3871
> email [e-mail]
>
> Sells for $149--I wondered how much they cost so I did a net search...
>
> Zack KH6CP/1


I've seen a little bit of discussion on this "wind-up radio" but
no real description. Anyone know what this is all about ?
(I suspect it's not to be confused with something like my daughter's
 Fisher-Price wind-up music box !?!? :)

Curious !
Hugh Duff  VA3TO  Toronto


---
 ■ NFX v1.3 [000]


From [e-mail] Tue May 07 19:41:01 1996
From: [e-mail] (John Tate)
Newsgroups: rec.radio.amateur.homebrew
Subject: Never Posted to a newsgroup
Date: Fri, 03 May 1996 10:12:08 GMT
Message-ID: <4mctob$[e-mail]>

        Just testing my posting abilities.  Please excuse!




From [e-mail] Tue May 07 19:41:02 1996
Newsgroups: rec.radio.amateur.homebrew
From: [e-mail] (Gary Coffman)
Subject: Re: Computer modem to TNC
Message-ID: <[e-mail]>
Reply-To: [e-mail] (Gary Coffman)
References: <[e-mail]>
Date: Fri, 3 May 1996 16:24:00 GMT

In article <[e-mail]> Trenton Selah <[e-mail]> writes:
>
>Does anyone know if it is possible to convert a computer modem to be
>used as a terminal node controller for packet?

Yeah. Just open the modem case, remove the circuit board, and toss
it. Now make a new circuit board with the proper kind of modem, NRZI
to NRZ converter, SIO, PTT circuit, and the proper kind of microcontroller
programmed with the TNC protocol, and fit it into the box.

Most telco modems today don't support Bell 202, so the modem part
has to be junked and replaced. Packet uses synchronous signaling
rather than the asynchronous signalling used by telco modems, so
you need a NRZI to NRZ converter and a SIO chip. Telco modems don't
have PTT circuits, though you might kludge the on-hook/off-hook relay
to work. And I don't know of anyone who has coded AX25 for the Z8, so
the microprocessor needs to be replaced with a Z80 so you can use
regular TNC code.

Now if you can find an old Bell 202 half duplex leased line modem
with no smarts, you can use that with software in the host to emulate
a TNC, ala Baycom, but it won't *be* a TNC. And you can use a modem
that supports Bell 103 on HF, if you can trick the smarts to get out
of the way, again with software on the host to emulate a TNC.

But if you want a real TNC, there isn't much in a telco modem you
can salvage except the case and the wall wart.

Gary
--
Gary Coffman KE4ZV          |    You make it,     | Due to provider problems
Destructive Testing Systems |    we break it.     | with previous uucp address
es
534 Shannon Way             |    Guaranteed!      | Email to [e-mail]
Lawrenceville, GA 30244     |                     |


From [e-mail] Tue May 07 19:41:03 1996
From: [e-mail] (david james)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re Broadband Noise Source to Tune Preamps ?
Date: 4 May 1996 12:30:29 GMT
Message-ID: <4mfil5$[e-mail]>
References: <4m8820$[e-mail]> <4m8ajr$[e-mail]> <[e-mail]>

While we are on the subject here what is a good way to tune a preamp with
one of these simple devices ? I have read about a one or two but I would like
to know about experiences others have had.

daveb


From [e-mail] Tue May 07 19:41:03 1996
Date: 4 May 1996 21:50:58 EDT
Newsgroups: rec.radio.amateur.homebrew
From: [e-mail] (Hugh Duff)
Message-ID: <[e-mail]>
Subject: R/S 49 MHz HT's ???



Wondering if the Radio Shack 49 MHz walkie-talkies use separate
RX and TX crystals or 1 for TX only ?
I'd like to try and get one onto 6 meters to use as a repeater monitor
and occasionally try to access it.
Also appreciate any info from those who have done already done something
like this. HT model numbers appreciated.

Thanks in advance...

Hugh Duff  VA3TO  Toronto


---
 ■ NFX v1.3 [000]


From [e-mail] Tue May 07 19:41:04 1996
From: [e-mail] (Bill Poston)
Newsgroups: rec.radio.amateur.antenna,rec.radio.amateur.homebrew
Subject: HOW DO U CONNECT COAX TO QUAD????????
Date: Sun, 05 May 1996 02:47:42 GMT
Message-ID: <[e-mail]>

I am attempting to homebrew a quad antenna. I have read Cubical Quad
Antennas by W6SAI and the ARRL Antenna Book. Neither answers my question.

How do I connect one coax feedline to the multiple loops on the driven
element?

Please explain in detail so that a dummy can understand.

Thanks in advance for your help.


Email would be appreciated.


Bill N4BVS
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Bill            <[e-mail]>
Marietta, Ga.
================== THIS TOO, SHALL PASS ==================


From [e-mail] Tue May 07 19:41:05 1996
From: [e-mail] (Jeffrey L. Bauman)
Newsgroups: rec.radio.amateur.homebrew
Subject: 100 HZ PL Tone Oscillator?
Date: 5 May 1996 04:02:30 GMT
Message-ID: <4mh98m$[e-mail]>



Anyone seen any articles and/or circuits for a 100hz tone
generator I can use with some older 2 meter gear to access
some local repeaters?

Jeff
WB5KZW
Near Detroit
[phone]

Thanks!
--


From [e-mail] Tue May 07 19:41:06 1996
From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: no
Date: 5 May 96 05:02:30 GMT
Message-ID: <[e-mail]>





From [e-mail] Tue May 07 19:41:07 1996
From: [e-mail] (Ed Ganger)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: 100 HZ PL Tone Oscillator?
Date: Sun, 5 May 1996 12:31:23 -0400
Message-ID: <[e-mail]>
References: <4mh98m$[e-mail]> <4mhcvv$[e-mail]>

In article <4mhcvv$[e-mail]> [e-mail] (Kerry Miller) wr
ites:
>From: [e-mail] (Kerry Miller)
>Subject: Re: 100 HZ PL Tone Oscillator?
>Date: Sun, 05 May 1996 05:07:58 GMT

>[e-mail] (Jeffrey L. Bauman) wrote:



>>Anyone seen any articles and/or circuits for a 100hz tone
>>generator I can use with some older 2 meter gear to access
>>some local repeaters?

>Jeff,
>        I built a tone encoder many moons ago out of a 555.  It was very
>simple and not filtered very well so it wasn't exactly "subaudible".
>Most repeaters passed the tone a little bit.  It was a square wave so
>you couldn't turn it down as far and still have the decoder recognize
>it.  Any data sheet or Radio Shack book will tell you how to do it.
>BTW, I used it on 110.9 mostly, but tried it  from abt 80 hz to 150,
>worked fine.
>Good luck,
>Kerry
>WD5ABC


I think an Intersil 8038 would be a VERY GOOD part for this.

It is an RC oscillator with VCO, and triangle to sine wave
converter onboard. It is about $5 in onesies.
1 RC sets frequency, 2 R's set sinewave distortion level ...
untrimmed it is about 2% if i reall right, adjustable to
less than 1% ( but who cares for PL).
You can get it at Jameco, and I think DigiKey has it in stock
as well. It is the chip that the less expensive sine-square-triangle
function generators are (is?) based on.

Regards,
Ed KB4ORA



From [e-mail] Tue May 07 19:41:08 1996
From: Richard Hager <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Pebble Crusher - Output problem
Date: Sun, 05 May 1996 16:16:59 -0500
Message-ID: <[e-mail]>
References: <4m3hms$[e-mail]> <[e-mail]> <4m5245$[e-mail]> <[e-mail]>

Tim Hynde ka8ddz  writes:
> >after removing about HALF the turns I had the power up to about 3/4 of a wa
tt.
snip...
> >Whats happening here? clearly the inductance is half of what it should
> >be,--

Actually, the inductance is about a -quarter- of what it should be.

L is related to the -square- of the turns if I remember right.

In general, when building from a set of known-to-work plans, it's best not
to modify component values by 400% as your first troubleshooting step.
The problem is probably elsewhere.

Good luck!


        Richard Hager

+ Ah-ha! Design Group, Inc.           -
+ Precision CNC Technology, since 1991 -
+ 612-641-1797, Fax: [phone]       -
+ "I just like to build stuff" So...     -
+ for CNC info, don't email me, call      -
+ or email Ah-ha! directly.  Thanks!       -
+ www.gdic.com/ahha  email: [e-mail]   -


From [e-mail] Tue May 07 19:41:09 1996
From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: ITC Spectrum Analyzers
Date: 5 May 1996 21:57:41 GMT
Message-ID: <4mj88l$[e-mail]>
References: <4mgevh$[e-mail]>

>   [e-mail] (david james) writes:
>  Greetings
>
>  Has anyone anything to say about ITC spectrum analyzers. I noticed
>  they stopped advertising in the popular ham rags. I'm considering one
>  of these over a HP-141T. Bad choice ???
>
>  Thanks
>
>  daveb
>
>
>>>>
They (ITC) are still advertising in mags like Mobile Radio Technology. I've ha
d a little touchy feely
with the units and they didn't play too bad. This was at a demo at a ham fest.


For my money, it would depend on what I wanted the unit for. If I needed porta
bility, I'd buy the ITC.
But for all round bench work, the 141T/855x units are the best for the money.
I have a
141T/8552B/8556A/8554B setup and wouldn't get rid of it for any money.

Richard Kendrick CET WA7TWI






From [e-mail] Tue May 07 19:41:11 1996
Date: 6 May 1996 09:02:58 EDT
Newsgroups: rec.radio.amateur.homebrew
From: [e-mail] (Hugh Duff)
Message-ID: <[e-mail]>
References: <4mjsml$[e-mail]>
Subject: Re: R/S 49 MHz HT's ???


>
> In a previous article, [e-mail] (Hugh Duff) says:
>
> >
> >
> >Wondering if the Radio Shack 49 MHz walkie-talkies use separate
> >RX and TX crystals or 1 for TX only ?
> >I'd like to try and get one onto 6 meters to use as a repeater monitor
> >and occasionally try to access it.
> >Also appreciate any info from those who have done already done something
> >like this. HT model numbers appreciated.
> >
> >Thanks in advance...
> >
> >Hugh Duff  VA3TO  Toronto
> >
> Hugh:
> The TRC-509's, single channel HT's that Radio Shack sells has separate
> RX and TX crystals plus a 10.245 crystal for 2nd IF.
> I have done the conversion and hope to get final writeup on how I did it
> in the next couple of weeks posted.
> Mostly it is merly a crystal and tune up to the unit is all it needs.
>
> --
> Mark Garrett   [e-mail]
>                KA9SZX @ N9LNQ.#ECIL.IL.USA.NOAM
>

Thanks for the reply Mark. R/S has a TRC-505 on sale up here in Canada
and I was thinking of picking one up. I will assume it has a similar
scheme to yours...unlike the old 27 MHz toy WTs that used an LC circuit
on RX.
Where did you get your crystals from and what were the specs
(3rd overtone, series or parallel cut, loading capactiance... ?)

Thanks again..Hugh..


---
 ■ NFX v1.3 [000]


From [e-mail] Tue May 07 19:41:12 1996
Newsgroups: rec.radio.amateur.antenna,rec.radio.amateur.homebrew
From: Monty Wilson <[e-mail]>
Subject: Re: HOW DO U CONNECT COAX TO QUAD????????
Message-ID: <[e-mail]>
Date: Mon, 6 May 1996 21:07:06 GMT
References: <[e-mail]>

[e-mail] (Bill Poston) wrote:
>I am attempting to homebrew a quad antenna. I have read Cubical Quad
>Antennas by W6SAI and the ARRL Antenna Book. Neither answers my question.
>
>How do I connect one coax feedline to the multiple loops on the driven
>element?
>
>Please explain in detail so that a dummy can understand.

I believe you just tie them together:

                /----------------\
                |                |
                |   /---------\  |
                |   |         |  |
                |   |         |  |
                |   |  /---\  |  |
                |   |  |   |  |  |
                |   |  |   |  |  |
                |   |  |   |  |  |
                |   |  \   /  |  |
                |   |   | |   |  |
                |   |   | |   |  |
                |   \---+ +---/  |
                |       | |      |
                \-------+ +------/
                        | |
                        \-O
                          H
                          H
--
.........Monty.
[e-mail]




From [e-mail] Sun May 12 18:13:54 1996
From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Source for crystals
Date: Wed, 01 May 96 19:07:27 EST
Message-ID: <[e-mail]>
References: <[e-mail]>


In Article<[e-mail]>,
<[e-mail]> write:
> Path:
news1.sunbelt.net!udel!gatech!news.cse.psu.edu!uwm.edu!math.ohio-state.edu!how
l
and.reston.ans.net!newsfeed.internetmci.com!in1.uu.net!lebanet!fig.leba.net!an
d
rewz
> From: Andrew Zimmerman <[e-mail]>
> Newsgroups: rec.radio.amateur.homebrew
> Subject: Source for crystals
> Date: Tue, 30 Apr 1996 20:48:47 -0400
> Organization: LebaNet
> Lines: 10
> Message-ID: <[e-mail]>
> NNTP-Posting-Host: fig.leba.net
> Mime-Version: 1.0
> Content-Type: TEXT/PLAIN; charset=US-ASCII
>
> Where can I purchase crystals for the 2 meter band? I have all the specs
> in my radio manual (Genave GTX-2). Thank you.
>
> Andrew
>
> -------------------------------------------------------------------------
> [e-mail]      Compu$erve  73307,2755     Amateur Radio AA3AK
> -------------------------------------------------------------------------
>
>
Try JAN Crystals.  These folks have been around a very long time,
and have a super reputation.  They do have an 800 number,

1-800-JAN-XTAL

About all you need is the model radio, and the frequencies
you are interested in.  If, perchance, they do not already
have information on a specific model, they will let you know.

Good luck.

73,
Buck  KC4GCK




From [e-mail] Sun May 12 18:13:55 1996
From: [e-mail] (Bob Duckworth)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Need Phone In-Use Light
Date: 4 May 1996 18:55:28 -0400
Message-ID: <4mgn90$[e-mail]>
References: <[e-mail]> <[e-mail]> <4mb4ad$[e-mail]> <[e-mail]>

In article <[e-mail]>,
Gary Coffman <[e-mail]> wrote:
>In article <4mb4ad$[e-mail]> [e-mail] (Bob Duckwort
h) writes:
>
>Yeah, you can do this is you don't mind massive RFI.
>
>Putting diacs (or diodes) in the phone line is not a good
>idea if you operate HF. (Or if your neighbor does.)
>
Only a problem if one doesn't take measures to deal with the RF.
A bit of 'C' will do in most cases.
-bob

--
Bob Duckworth Consulting, 960 Ralph McGill Blvd. Atlanta GA 30306-4447
bobs' address is [e-mail]    404-888-0389(V) 892-2301(FAX)
Buy Sell Trade Surplus Computer Electronics Datacom Telecom since 1981.
Fax or email your list for a fast cash offer. Watch for listserv catalog.


From [e-mail] Sun May 12 18:13:56 1996
From: [e-mail] (Arlan R. Levitan)
Newsgroups: rec.radio.amateur.homebrew
Subject: Practical to build HF linear?
Date: Tue, 07 May 96 03:16:02 GMT
Message-ID: <4mmf9r$[e-mail]>

Howdy,

I'm a newbie to this group...have been reading the traffic for about a month
now, and am looking for info regarding the practicallity of homebrewing an HF
linear amplfier.

Would prefer something of the solid state ilk (400-500 watts), and would like
to power it in the shack using a marine battery. Ameritron, SGC, and Ten-Tec
make boxes that seem to fit the bill but I have no desire to dump $800+ for a
commercially made device that I would use only occasionally.

Besides, it's been at least 20 years since I was thrown across a room after
inadvertently discharging the capacitor of a dissected strobe flash, and have
gotten somewhat nostalgic regarding endangering my life with high voltage
(grin).

Is it practical to "roll your own" solid state linear? Saw some plans based on

Motorola "experimenter" sheets last year at Dayton, but they all required
higher DC feeds than a single Marine cell could deliver.

All advice, pointers, tips, tricks, and/or snide comments cheerfully accepted.

73
Arlan KG8OW


From [e-mail] Sun May 12 18:13:57 1996
From: [e-mail] (Clinton Peebles)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Wind up radio followup
Date: Tue,  7 May 1996 13:33:38 GMT
Message-ID: <[e-mail]>
Distribution: world

Here is the info I got from my question on the windup radio.

Windup Technology 206-783-2880  FAX [phone]
1-888-946-3871
email [e-mail]


From [e-mail] Sun May 12 18:13:58 1996
From: [e-mail] (Brian Pasternak)
Newsgroups: rec.radio.amateur.homebrew
Subject: WTB: Unbuilt Heathkit HW8 or HW9
Date: Tue, 07 May 1996 14:43:18 GMT
Message-ID: <4mnrh8$[e-mail]>
Reply-To: [e-mail]

Hello.  I am looking for an unbuilt Heathkit HW8 or HW9.  Kit must be
complete with docs.
Please send me $$$ info and condition via email [e-mail].
Thanks.
Brian Pasternak




From [e-mail] Sun May 12 18:13:59 1996
Newsgroups: rec.radio.amateur.homebrew
From: [e-mail] (SARUMAN)
Subject: Re: WTB: Synths, Drum Machines & FX - analog or digital
Message-ID: <[e-mail]>
References: <4mkl9r$[e-mail]>
Date: Tue, 7 May 1996 20:27:18 GMT

>WTB: Synths, Drum Machines & FX - analog or digital

>Arp, Akai, Boss, Buchla, Crumar, Chroma, EDP, EML, EMS, Korg, Moog, Oberheim,
>Octave, PAIA, PPG, Roland, Serge, Sequential, Simmons, Yamaha, ETC...

>* Older stuff With or Without MIDI
>* Synthesizers - analog, modular, patchable, some digital, etc...
>* Drum machines, Ryhthm units - analog
>* Sequencers - CV & gate
>* Converter units - MIDI to CV & gate, etc
>* Sync units - Din Sync, etc.
>* Effects processors - tube, analog, digital
>* Vocoders
>* Effects pedals

>* Even Newer Stuff

>* Also Wanted: Recording Gear - Mics, Pre-amps, Processors, etc...

>* Anything else that falls under the electronic music realm...

>Please write back with a description of what you have...
>Thankyou.
>--
>6

I have an Akai VX-90 Synth Module, Roland MKS-50 Synth Module, EMU Drumulator
Drum machine, Roland TR-707 drum machine and a Tascam Porta 05 4 Track Tape
deck for sale. Also have a Charvel Strat Guitar with Midi Pickup and Guitar to
MIDI Converter. Make an offer on any or all.

<tsb>
                               Midgard Graphics
           3D Animation and Special FX for the hobbyist videographer
                          Email: [e-mail]

--
          Drop into #amigacafe on IRC's undernet for a chat sometime

--

<tsb>

                     A man of many hobby's master of none.




From [e-mail] Sun May 12 18:14:01 1996
From: [e-mail] (Dan Morisseau)
Newsgroups: rec.radio.amateur.misc,rec.radio.amateur.digital.misc,rec.radio.amateur.policy,rec.radio.amateur.homebrew,rec.radio.amateur.misc,rec.radio.scanner,rec.radio.shortwave,sci.electronics,rec.radio.pirates
Subject: Re: Seattle Quake Story At Ham Radio Online
Date: Tue, 7 May 1996 21:09:18 PST
Message-ID: <[e-mail]>
References: <4mdd58$[e-mail]> <4mia6i$[e-mail]> <[e-mail]> <[e-mail]>

In article Don Skidmore <[e-mail]> writes:



:>I was there.  There were a few isolated outages for a short period, and some
:>delayed dial tones (People calling each other to ask "What was that?!". I
:turned>on my monitor--it was actually relatively quiet.

:>I'm really glad hams are available to help.  They perform extremely valuable
:>services during emergencies.  This one was more in the nature of one hell
:>of a wake-up call rather than a catastrophe (except for a small number of
:>folks who did have serious damage).

:>I thought the account was a bit overblown under the circumstances.


    I was there too, Don and I agree. It was grossly overblown and the Ham
Radio Online story echoed the silliness with which the local media handled
the non-event. Hysteria and anxiety make some people seem much more imprtant
than boredom and business as usual.

>Just my $.02

>Don
>Bellevue, WA

==========================================================================
  Dan Morisseau, N7ZXL| I root for 2 teams  -  The St. Louis Cardinals ...
   47.28N/122.50W/300'| and whoever is playing against the New York Mets!
  [e-mail]|
==========================================================================


From [e-mail] Sun May 12 18:14:01 1996
From: [e-mail] (WB3U)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Toriod power handling capacity
Date: Wed, 08 May 96 02:21:30 GMT
Message-ID: <4mp4h1$[e-mail]>
References: <4mnrne$[e-mail]>

Post / CC by Mail

   [e-mail] (Frank Ellesmere) wrote:

>Would appreciate formula(s) for calculating the HF power handling
>capacity of iron and ferrite toroids. Application is Pi-L for HF
>vacuum tube linear amplifiers.  I have seen designs where  L 2 is
>often a toroid up to 20Mhz and have seen designs where L1 is
sometimes a toroid in the same freq range.

There are two spreadsheets on my FTP site that might be of help
if you have Excel 4.0 for Windows or something compatible.  The
files are labeled Toroid.xls and Flux2.xls.  The FTP site is:
ftp.microserve.com/popaccts/h/jackl/

You can also get the formula from the Amidon flyer (catalog).
Their phone number is: [phone].  Note that the formula uses
only three factors in determining flux:  the cross-sectional area
of the core, the number of turns, and the voltage across the turns.
The maximum permissable flux varies by frequency but not by the
core material.  It is inversely proportional to the number of turns
though, so permeability affects the results because it will determine
the number of turns for a given inductance.

73,
Jack  WB3U



From [e-mail] Sun May 12 18:14:02 1996
From: [e-mail] (qrk)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: RF filter needed
Date: Wed, 08 May 1996 03:43:10 GMT
Message-ID: <4mp57j$[e-mail]>
References: <[e-mail]>

Larry West <[e-mail]> wrote:
>I need to block out a very strong local FM Broadcast station
>so I can receive a distant station on an adjacent channel.
>The receivers I have are not sufficiently selective to
>ignore the unwanted signal (or that signal is splattering
>everywhere!).

>The station I want is on 92.5Mhz, and the station I don't
>want is on 92.3Mhz.
>[snip]
>I'm willing and able to make it myself, but I need some
>values for the components, and some suggestions on
>recommended types of filters.

>I suppose a directional antenna would help, too, so I'll get
>out the 'ol Antenna Book, and check out those possibilities,
>too.

It might be a bit difficult building an LC filter for the above
situation.  The Q of the filter would have to be on the order of 460.
Plus, the skirts of the filters would have to be rather steep calling
for a multi-section design which equates to having an even higher Q
for the filter sections.  If you want to have fun, you can make a
tuned cavity out of 3 pound coffee cans.  A little funky, a bit lossy,
but educational.

Better that you try a directional antenna like a simple Yagi.  If you
live in an area with tall buildings or mountains, then a directional
antenna may be useless due to reflections.

-
Mark Chun  |  [e-mail]  |  Santa Barbara, CA



From [e-mail] Sun May 12 18:14:04 1996
From: [e-mail] (Scott Stephens)
Newsgroups: sci.materials.ceramics,rec.radio.amateur.homebrew,sci.electronics.components
Subject: Etching piezo-ceramic with saltwater? Homebrew SAW filters
Date: Wed, 08 May 1996 06:05:52 GMT
Message-ID: <4mna5l$[e-mail]>

I am looking for a cheap available etchant for PZT ceramics, the type
used in piezoelectric buzzers and transducers, and to understand thier
chemistry better.

I found that electropolishing a brass-backed piezo-disk in salt water
etched the crystal as well as the brass while etching in a copper
sulfate solution does not.

To etch, I tried both bleach (sodium hypochlorite) and hydrochloric
acid seperately, with no result. When both were mixed (resulting in
chloric acid +ClO^3?) a white precipitate (what?) formed on the
dissolving ceramic. I assume this to be the mechanism in electrolyzing
saltwater.

Any explanations and/or ways to etch piezo disks to custom shapes for
hacker saw-filters?



From [e-mail] Sun May 12 18:14:04 1996
From: [e-mail] (Chuck Hanavin)
Newsgroups: rec.radio.amateur.homebrew
Subject: WTB 100TL's or 100TH's
Date: 8 May 1996 12:59:50 GMT
Message-ID: <4mq5s7$[e-mail]>

I am looking for preferably 4 or 5 good
100TL tubes. I will also consider 100TH's,
250TL's, or 250TH's.

I have for trade: cash, 833's, 4-440's, 4-125's,
809's, 2A3's, 6L6's, etc.


Chuck (WB3FJJ)  Email: [e-mail]



From [e-mail] Sun May 12 18:14:05 1996
From: Cecil Moore <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Tuning Capacitor
Date: 8 May 1996 22:36:03 GMT
Message-ID: <4mr7kj$[e-mail]>
References: <[e-mail]>

[e-mail] (Peter Alfke) wrote:
>I am looking for a source of good, old-fashioned tuning capacitors,

Hi Peter, Fair Radio Sales has a 3-gang, 540pf per gang, new for $10.
Part# ASP-074-048  [phone]

73, Cecil, KG7BK, OOTC  (not speaking for my employer)




From [e-mail] Sun May 12 18:14:06 1996
From: Cecil Moore <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Tuning Capacitor
Date: 8 May 1996 22:39:37 GMT
Message-ID: <4mr7r9$[e-mail]>
References: <[e-mail]> <4mr7kj$[e-mail]>

Cecil Moore <[e-mail]> wrote:
>[e-mail] (Peter Alfke) wrote:
>>I am looking for a source of good, old-fashioned tuning capacitors,
>
Whoops, just noticed the 100-250MHz. They also have a 2-gang, 14-78pf and
17-100pf with a 0.09 in. gap.




From [e-mail] Sun May 12 18:14:07 1996
From: Gerhard Hoffmann <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Tuning Capacitor
Date: 9 May 1996 01:33:38 GMT
Message-ID: <4mri1i$[e-mail]>
References: <[e-mail]>

[e-mail] (Peter Alfke) wrote:
>
> I am looking for a source of good, old-fashioned tuning capacitors, the
> ones used in all radios before the age of varicaps.
> I want to build pulse generators with a 2.5 : 1 manual tuning range ( 100
> to 250 MHz ), and that is tough for varicaps. Any suggestions?

Varicaps aren't that bad.

Siemens BB811   8.8  .. 1.02 pF    at 1..28V
Siemens BB835   9.1  .. 0.62 pF    at 1..28V
Philips BB215   17   .. 2    pF    at 1..28V
MaCom   MA071   1.4  .. 0.1  pF    q=5000 GaAs


Gerhard Hoffmann




From [e-mail] Sun May 12 18:14:08 1996
From: [e-mail] (WB3U)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Nail polish as coil dope??
Date: Thu, 09 May 96 04:13:25 GMT
Message-ID: <4mrvf4$[e-mail]>
References: <4mqqic$[e-mail]>

   [e-mail] (Yin Lung Shih) wrote:

>Is clear nail polish (apparently composed of two kinds of acetate and
>solvent) acceptable as coil dope?  I'm building a project and thought
>I had read somewhere that it was so I used some on four coils.  I
>checked the inductances and they measured the same before and after,
>but I wasn't able to check for possible Q degrading effects.  After I
>soldered the coils in, I got some real Q-dope.  Now I'm wondering if
>I should pull those coils and rebuild them. Any comments?

Rebuilding those coils would be a major waste of time.  Fingernail
polish work just fine for this.  Its only drawback is that it may not
adhere as well as an actual adhesive, and it tends to be brittle.  If
you used enough so that it soaked into the coil, between the turns,
neither of these characteristics is likely to cause a problem.

73,
Jack  WB3U


From [e-mail] Sun May 12 18:14:09 1996
From: Zack Lau <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Toriod power handling capacity
Date: Thu, 09 May 1996 14:45:25 -0400
Message-ID: <[e-mail]>
References: <4mnrne$[e-mail]> <4mp4h1$[e-mail]> <[e-mail]>
To: Zack Lau <[e-mail]>

Zack Lau wrote:
>
> WB3U wrote:
> >
> > Post / CC by Mail
> >
> >    [e-mail] (Frank Ellesmere) wrote:
> >
> > >Would appreciate formula(s) for calculating the HF power handling
> > >capacity of iron and ferrite toroids. Application is Pi-L for HF
> > >vacuum tube linear amplifiers.  I have seen designs where  L 2 is
> > >often a toroid up to 20Mhz and have seen designs where L1 is
> > sometimes a toroid in the same freq range.
> >
>
> > You can also get the formula from the Amidon flyer (catalog).
> > Their phone number is: [phone].  Note that the formula uses
> > only three factors in determining flux:  the cross-sectional area
> > of the core, the number of turns, and the voltage across the turns.
> > The maximum permissable flux varies by frequency but not by the
> > core material.  It is inversely proportional to the number of turns
> > though, so permeability affects the results because it will determine
> > the number of turns for a given inductance.
>
> Flux calculations aren't as useful at HF, since the iron
> powder cores are typically limited by power dissipation,

Jack wanted me to point out that the flux values
he mentions aren't related to saturation--that they
are Amidon's estimates for RF operation.

OTOH, I don't see how flux values can accurately predict core
losses if it ignores the core material.

> as opposed to core saturation.  Ferrites are rarely useful
> in a high power tuned circut due to their poor temperature
> stability.  I'd measure the Q can calculate the temperature                           ^^^
                                and
> rise.  The flux formula is useful when designing a 50 kHz
> switcher.
>
> Zack KH6CP/1


From [e-mail] Sun May 12 18:14:10 1996
From: [e-mail] (Terry Fugate)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: 8031 microcntrlr ham apps
Date: 9 May 1996 16:53:44 GMT
Message-ID: <4mt7uo$[e-mail]>
References: <[e-mail]> <4m3hms$[e-mail]> <4mg66o$[e-mail]>

In article <4mg66o$[e-mail]>, [e-mail] (robert bowman) sa
ys:
>
>In article <4m3hms$[e-mail]>, [e-mail](Tim
 Hynde ka8ddz qrp/Rochester, MI) says:
>>Anyone have any ham radio applications for the 80C32 / 8051
>>microcontroller family? I am trying to learn the 8032 and would like
>>some "usefull" programs to help with the teaching process.
>
>
>CW encoding/decoding is a fairly useful workout, or even thing like
>the MFJ 'personal code tutor'. it'll give you some experience with the
>timers, lookup tables, and so forth.
>
>or you could do a little DDS. the '51 can't really cut synthesis at a
>useful RF level, but audio output is the same technique, and a little
>easier to monitor.
>
>
The 8051 (and other single chip /cpu/eproms) are good for CW iders for
repeaters(especially for my mobile 2Mtr/70Cm crossband) or beacons.
The Cmos version is real good for my 6Mtr (solar pwrd beacon) The current
drain is next to nothing.  For repeater iders, it is fun to get the ider
to id on power up, the first time the tx comes up after 7min or so, then
to force an id cycle after 10 minutes (if there was no transmission after
7min).  Sometimes simple is simply better.


From [e-mail] Sun May 12 18:14:11 1996
From: [e-mail] (Hugo Rabson)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: 1750m Band
Date: Thu, 9 May 1996 20:20:48 +0100
Message-ID: <4mthtn$[e-mail]>
References: <[e-mail]>

In message <[e-mail]>
        [e-mail] (Ronald Cordina) writes:

> Hello  everyone.  Does anybody knows a source where i can have
> information and circuit diagrams to build a tranciever or transmitter
> only (AMand CW) for this band.  If thera are sugestions please e-mail
> me.
> Thank you.
> Bye
> Mario Cordina.

Try ARRL handbook 1996 chapter 17. Gl es 73 de John Rabson G3PAI





From [e-mail] Sun May 12 18:14:12 1996
Newsgroups: rec.radio.amateur.antenna,rec.radio.amateur.homebrew
From: "Al Koblinski  (W7XA)" <[e-mail]>
Subject: Re: HOW DO U CONNECT COAX TO QUAD????????
Message-ID: <[e-mail]>
To: [e-mail]
References: <[e-mail]>
Date: Thu, 9 May 1996 23:56:14 GMT

I use a 1:1 balun for each loop (Bencher, but any brand is OK).
Where needed I used a coax matching section to match.
On 20mtr, my 3 el on 26' boom was 49 ohms so no matching was needed for
50 ohm coax.
Ditto for 5 el on 15 mtrs with same boom.
10 meters, 5 elements came out to near 90 ohms impedence and I used a
section of 75 ohm coax between the balun and the 50 ohm feedline.
Each element is fed seperately through a switchbox.
I have used a variety of other feed methods in the past, such as gamma
matching (cumbersome) and found that the simple balun approach works
great and is mechanically the most simple.
73, Al




From [e-mail] Sun May 12 18:14:13 1996
From: "William E. Sabin" <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Toriod power handling capacity
Date: Fri, 10 May 1996 07:51:23 -0700
Distribution: world
Message-ID: <[e-mail]>
References: <4mnrne$[e-mail]> <4mp4h1$[e-mail]> <[e-mail]> <4muuuh$[e-mail]>

The Amidon data manual suggests values of flux *density* at various
frequencies to prevent overheating. Graphical info is also given. If the
flux density is limited to the values that they suggest, the number of
turns and the maximum applied voltage at a certain frequency can then be
calculated, using a formula derived from Faraday's law. These
"guidelines" are the *same* for iron and ferrite cores. The flux density
levels suggested are far below the saturation level and are based on a
combination of hysteresis, eddy current and dielectric losses per unit
volume, all of which increase rapidly with frequency. Saturation is not
the criterion for these suggested values of flux density, which for iron
is about 5000 Gauss and for ferrite about 2000 Gauss.

A further consideration is the value of inductive reactance at the lowest
frequency of interest. For a given core this determines the number of
turns. For a high permeability ferrite the required minimum number of
turns is very small and for a given value of applied voltage this can
cause the flux density to become too large and exceed the guidelines. If
we increase the number of turns the inductance becomes much much larger,
perhaps too large, and the Q can deteriorate, especially at the *high*
end of the frequency range. So for high power, broadband RF transformer
applications the larger, low permeability iron core or a low permeability
ferrite would be desirable.

For transmatch baluns the large iron core, or perhaps multiple stacked
cores, with a mu of 10 or 15 and many turns, seems to be the favorite,
perhaps also because of its higher saturation level (less intermodulation
distortion). This transformer will withstand fairly high voltages if it
is used within the suggested Amidon guidelines at the various
frequencies. If the core gets too warm (voltage too high), reduce the
voltage level, either by reducing the impedance level or the power level.

Further info is in an article in QEX for May 1995, which was written in
consultation with an Amidon engineer.

Bill W0IYH


From [e-mail] Sun May 12 18:14:15 1996
From: P Tyers <[e-mail]>
Newsgroups: rec.radio.amateur.antenna,rec.radio.amateur.homebrew
Subject: Re: HOW DO U CONNECT COAX TO QUAD????????
Date: Fri, 10 May 1996 14:08:58 +1100
Message-ID: <[e-mail]>
References: <[e-mail]> <[e-mail]>

Monty Wilson wrote:
>
> [e-mail] (Bill Poston) wrote:
> >I am attempting to homebrew a quad antenna. I have read Cubical Quad
> >Antennas by W6SAI and the ARRL Antenna Book. Neither answers my question.
> >
> >How do I connect one coax feedline to the multiple loops on the driven
> >element?
> >
> >Please explain in detail so that a dummy can understand.
>

Have another read of Cubical Quads. What you actually end up
doing is producing a multiple gamma match, one for each loop.
Of course they interact to all heck while being adjusted.I
seem to recall that the preferred order of adjustment was
from smallest loop to largest loop for minimum interaction -
BUT I COULD BE TOTALLY WRONG ON THIS.

 Another source of information is a series of articles
published in the Wireless Institute of Australia magazine
"Amateur Radio" about 15 +/- 5 years ago on multiband quads
which had several column inches on the care and feeding of
these gamma matches.

Hope this helps!

--
P Tyers, Tel. [phone]
AARnet: [e-mail]
CSnet: [e-mail]    HAM: VK3KTS
MAIL: Telstra Research Laboratories,P.O. Box 249,
      Clayton,VICTORIA 3168,AUSTRALIA


From [e-mail] Sun May 12 18:14:16 1996
From: [e-mail] (Bob Applegate)
Newsgroups: rec.radio.amateur.homebrew
Subject: Tek scopes... what features?
Date: 10 May 1996 18:10:59 GMT
Message-ID: <4n00rj$[e-mail]>

I've been thinking about buying a good scope for my workbench.
Being a software person, I have never used one "professionally,"
so I don't know the various features/models available.  Because
of previous experiences, a Tektronics would be prefered, but
what are the advantages/problems of various models?

My basic requirements:

   * Dual trace
   * 20 MHz
   * Not overly expensive, like under $400.
   * Mainframe design seems nice since new features could
     be added later (one I figure out what they do).
   * Smaller size is prefered; a cart is definately out.

So, what are all these models?  I see lots of 561A, 7403N, etc.
What's a decent type?

Bob


From [e-mail] Sun May 12 18:14:17 1996
From: [e-mail]
Newsgroups: rec.radio.amateur.antenna,rec.radio.amateur.homebrew
Subject: Re: HOW DO U CONNECT COAX TO QUAD????????
Date: 11 May 1996 05:45:45 GMT
Message-ID: <4n19i9$[e-mail]>
References: <[e-mail]> <[e-mail]> <[e-mail]>
Reply-To: [e-mail]

In <[e-mail]>, P Tyers <[e-mail]> writes:
>Monty Wilson wrote:
>>
>> [e-mail] (Bill Poston) wrote:
>> >I am attempting to homebrew a quad antenna. I have read Cubical Quad
>> >Antennas by W6SAI and the ARRL Antenna Book. Neither answers my question.
>> >
>> >How do I connect one coax feedline to the multiple loops on the driven
>> >element?
>> >
>> >Please explain in detail so that a dummy can understand.
>>
>
>Have another read of Cubical Quads. What you actually end up
>doing is producing a multiple gamma match, one for each loop.
>Of course they interact to all heck while being adjusted.I
>seem to recall that the preferred order of adjustment was
>from smallest loop to largest loop for minimum interaction -
>BUT I COULD BE TOTALLY WRONG ON THIS.
>
> Another source of information is a series of articles
>published in the Wireless Institute of Australia magazine
>"Amateur Radio" about 15 +/- 5 years ago on multiband quads
>which had several column inches on the care and feeding of
>these gamma matches.
>
>Hope this helps!
>
>--
>P Tyers, Tel. [phone]
>AARnet:        [e-mail]
>CSnet: [e-mail]    HAM: VK3KTS
>MAIL: Telstra Research Laboratories,P.O. Box 249,
>      Clayton,VICTORIA 3168,AUSTRALIA

You're right on target!  Highest to lowest frequency.

It takes some juggling.

However, once done, the match stays done.

I've used the gamma match feed system on quads (and virtually everything
else I can reasonably adapt it to.  It works on the quads VERY well.

Another tip.  In stead of chasing all over heck and back for big variable
capacitors as you get down to 40 and 80 meter quads, use a chunk of RG-8
coax cable as a capacitor.  It has capacity and a nice hefty dialectric that
will let you use the inner conductor as one arm of a capacitor and the
outer shield as the other arm.  You get it too long by a foot or so for the
total capacity you need.  You whackem off an inch or so at a time at lower
power to trim away the capacitance.  You use a much smaller air variable
for the trimmer.

When done, presto, BIG heavy cap for 40 and 80 meter versions heap cheapo.

Be sure to trim away some of the braid and leave an inch or so of the inner
conductor and insulation extended to avoice arcing at high power....

Tape the end up to excude water.

Smile all the way to the bank.

:)

Mike W5WQN as a guest at leviathan.tamu.edu (No mail address there)



From [e-mail] Sun May 12 18:14:18 1996
From: WD8DZB  (Dave Zawodny)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: TS-32 PL Decoder
Date: 12 May 1996 04:52:02 -0700
Message-ID: <[e-mail]>
References: <4n2q98$[e-mail]>
Reply-To: [e-mail]

[e-mail] (KC8CGX) wrote:

>Does anyone have the address for "Communication
>Specialists", or know the pricetag for their TS-32 PL
>Decoder?
>
>Doug
>KC8CGX
>
>_____________________________________________
>North Central Ohio Skywarn Info
>http://www.amnorth.com/redbone/skywarn.html
>http://www.amnorth.com/redbone/ham-page.html
>http://lrbcg.com/dougd
>
Doug,

Communications Specialists, Inc.
426 West Taft Ave.
Orange, CA 92665-4296
[phone] FAX (714) 974    3420
1-800-854-0547


The TS-32P Encoder-Decoder Was $ 57.95 (1-9), last time I bought
'em.

73,  WD8DZB


From [e-mail] Sun May 19 14:04:12 1996
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: "Blue Steel Razor" radio?
Message-ID: <[e-mail]>
From: [e-mail] (Alan Peake)
Date: Thu, 16 May 1996 09:57:46
References: <4mt9mo$[e-mail]> <4mvi3n$[e-mail]>

....   Used pencil "lead" across two upright razors to make a "carbon"
>microphone also.

Some ingenious type also made a variable capacitor by using layers of blades.
This was in a Matchbox radio. Never tried it myself but did get the detector
working - 2B pencil lead seemed the best with Gillette blades. Best "cat's
whisker" I ever had was one in which I made my own "crystal" of FeS.

Tell yoong people that today - and they won't believe you!

ALan



From [e-mail] Sun May 19 14:04:14 1996
From: [e-mail] (COUGER GORDON)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: "Blue Steel Razor" radio?
Date: 18 May 1996 15:59:47 GMT
Message-ID: <4nks5j$[e-mail]>
References: <4mt9mo$[e-mail]> <4mvi3n$[e-mail]> <4nbbas$[e-mail]> <[e-mail]>

In article <[e-mail]>,
Alan Peake <[e-mail]> wrote:
>....   Used pencil "lead" across two upright razors to make a "carbon"
>>microphone also.
>
>Some ingenious type also made a variable capacitor by using layers of blades.

>This was in a Matchbox radio. Never tried it myself but did get the detector
>working - 2B pencil lead seemed the best with Gillette blades. Best "cat's
>whisker" I ever had was one in which I made my own "crystal" of FeS.
>
>ALan
Tell us how you make the FeS crystal please.

Gordon
Gordon Couger Senior Software Specialist
Biosystems & Agricultural Engineering Dept.  Oklahoma State Univ.
114 Ag Hall Stillwater, OK 74075
[e-mail]


From [e-mail] Sun May 19 14:04:15 1996
From: [e-mail] (Steven L. Finberg)
Newsgroups: rec.radio.swap,rec.radio.amateur.misc,rec.radio.info,sci.electronics.misc,ne.forsale,ne.general,rec.radio.amateur.homebrew
Subject: ** FLEA at MIT **     Sunday 19 May       Cambridge MA
Date: 14 May 1996 11:27:19 GMT
Distribution: na
Message-ID: <4n9qmn$[e-mail]>
Summary: Buy Sell SWAP Ham Radio  Electronics Computers 9AM - 2PM
Keywords: Hamfest Fleamarket SWAPFEST  Computers Ham Radio Electronics


We have a new larger lot just  4 blocks   West of our old location...

*********  $1  buyers discount with hardcopy of this notice ********

COMPUTERS - ELECTRONICS - HAM RADIO - COMPUTERS - ELECTRONICS - HAM RADIO

                  FLEA  all SUMMER at MIT
                      May  19th,  1995
                         9AM-2PM

Come to the city for a great flea - plenty of free parking.

        MIT's  electronics and ham radio flea will take
        place on the third Sunday of each month this summer,
        April thru October.

        There is tailgate space for over 400 sellers and
        free, off-street buyers parking!

        Buyers admission is $4  (you get $1 off if
        you're lucky enough to have a copy of our ad)
        and sellers spaces are $10.00-each at the gate.

        The flea will be held at the corner of Pacific and
        Landsdowne streets in Cambridge; half a block off
        Albany St near Central Square from 9AM to 2PM,
        with sellers set-up time starting at 7AM.

        !! RAIN or SHINE !!

        Talk-in: 146.52 and W1XM/R-449.725/444.725 (PL 114.8/2A).

        Sponsors: MIT Electronics Research Society
                  MIT UHF Repeater Association (W1XM)
                  MIT Radio Society (W1MX)
                  Harvard Wireless Club (W1AF)

        For more info / advanced reservations 617 253 3776

********** $1  buyers discount with hard copy of this notice ************


******************************************************************************
*
Steve Finberg                       W1GSL                      [e-mail]
PO Box 82 MIT Br           Cambridge MA  02139-7082             617 258 3754
******************************************************************************
*






From [e-mail] Sun May 19 14:04:15 1996
From: [e-mail] (TIEMANN BRUCE)
Newsgroups: rec.radio.amateur.homebrew
Subject: *Really* low noise-figure preamp designs?
Date: 13 May 1996 23:06:07 GMT
Message-ID: <4n8f8v$[e-mail]>

I recall mention of high-power GaAsFETs being used to win the noise-figure
contests (held at VHF/UHF get-togethers) with NFs around 0.2-0.25 dB,
well below the typical 0.6 dB stated for the GaAsFET preamps in the ARRL
Handbook's VHF projects section.  Are the former capable of low-IMD in
high-signal areas?  If so, are there published circuits (and part numbers)
for the ultralow noise preamps?

For starters, I'm interested in 6m and 2m.

By chance, does anyone from the W2SZ/1 camp care to shed some light on
the high-performance preamps they use (if any)?

Bruce
N6URH


From [e-mail] Sun May 19 14:04:16 1996
From: [e-mail] (Hugo Rabson)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: 1750m Band
Date: Thu, 9 May 1996 20:20:48 +0100
Message-ID: <4mthtn$[e-mail]>
References: <[e-mail]>

In message <[e-mail]>
        [e-mail] (Ronald Cordina) writes:

> Hello  everyone.  Does anybody knows a source where i can have
> information and circuit diagrams to build a tranciever or transmitter
> only (AMand CW) for this band.  If thera are sugestions please e-mail
> me.
> Thank you.
> Bye
> Mario Cordina.

Try ARRL handbook 1996 chapter 17. Gl es 73 de John Rabson G3PAI





From [e-mail] Sun May 19 14:04:17 1996
From: [e-mail](Brian J Mork)
Newsgroups: rec.radio.amateur.homebrew,sci.electronics.repair,misc.forsale.non-computer,rec.radio.swap
Subject: 4$ale - Eagle computer PHONES, working/salvage parts
Date: 18 May 1996 14:45:40 GMT
Message-ID: <4nknqk$[e-mail]>

Multiple copies of "Eagle" Telephones for sale.  Each can be used
as-is if you have an Eagle network, or salvaged for lots of neat
prototyping parts.

Just to get the ideas flowing, consider that each has:

 o Epoxy encapsulated magnetic reed-switch (phone handset proximity
   sensor)

 o 1.5" x 7" 20 push-button selector panel.  Each button has two
   colored LEDs and room to insert a small paper label.  34-wire
   ribbon cable/connectors.

 o 12-button high-quality feel phone pad, about 2"x 3", with 8-wire
   flat ribbon cable/connectors.

 o 4-digit LED display, with ":" and decimals built onto the display

 o Astec daughter card, 2.5"x 1.5", that appears to be the TelCo
   interface

 o One 4-pin, and two 6-pin J connectors.

 o 8 position DIP switch

 o One 2" diameter, 8-ohm speaker

 o Bunch of ICs: CD4081, HCF4069, 2x HCF4066, LS404CB, 2x ULN2003A,
   2x ULN2032, SN75176, AMI 8948 (programmed 8048?), LM386

 o 3.579575 MHz crystal

 o Two 10k-ohm dial pots

 o Beige enclosure.  I have only a few handsets/cords.  Let me
   know if you particularly are interestd in the handset.

I'll sell these for $22 or lower, depending on how many you want.
Buyer pays UPS or USMail shipping.  E-mail or call Brian, 719-472-
0707 or [e-mail].



From [e-mail] Sun May 19 14:04:19 1996
From: [e-mail] (Terry Fugate)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: 8031 microcntrlr ham apps
Date: 9 May 1996 16:53:44 GMT
Message-ID: <4mt7uo$[e-mail]>
References: <[e-mail]> <4m3hms$[e-mail]> <4mg66o$[e-mail]>

In article <4mg66o$[e-mail]>, [e-mail] (robert bowman) sa
ys:
>
>In article <4m3hms$[e-mail]>, [e-mail](Tim
 Hynde ka8ddz qrp/Rochester, MI) says:
>>Anyone have any ham radio applications for the 80C32 / 8051
>>microcontroller family? I am trying to learn the 8032 and would like
>>some "usefull" programs to help with the teaching process.
>
>
>CW encoding/decoding is a fairly useful workout, or even thing like
>the MFJ 'personal code tutor'. it'll give you some experience with the
>timers, lookup tables, and so forth.
>
>or you could do a little DDS. the '51 can't really cut synthesis at a
>useful RF level, but audio output is the same technique, and a little
>easier to monitor.
>
>
The 8051 (and other single chip /cpu/eproms) are good for CW iders for
repeaters(especially for my mobile 2Mtr/70Cm crossband) or beacons.
The Cmos version is real good for my 6Mtr (solar pwrd beacon) The current
drain is next to nothing.  For repeater iders, it is fun to get the ider
to id on power up, the first time the tx comes up after 7min or so, then
to force an id cycle after 10 minutes (if there was no transmission after
7min).  Sometimes simple is simply better.


From [e-mail] Sun May 19 14:04:21 1996
From: [e-mail] (Ed Ganger)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Audio input/output
Date: Sat, 11 May 1996 23:44:40 -0400
Message-ID: <[e-mail]>
References: <4n3cmv$[e-mail]>

In article <4n3cmv$[e-mail]> [e-mail] (Brett Kol
lar) writes:
>I would like to send the output from two different audio sources to
>the same input device.  My consern is "back-feeding" one of the other
>output devices and I am looking for an easy way to prevent this.  The
>crude drawing below explains what I am really trying to say...

                      +------R2------------------+
                      |                          |
                      | node |\                  |
>Audio 1======|---R1- + -+---|-\NE5532 (or 741)  |
>                        |   |  \________--------+----===INPUT
>                        |   |  /
>                        | +-|+/
>Audio 2======|---R1 ----+ | |/
                           V (gnd)

Gain for each channel is -(r2/r1)
The point labelled "node" is a "virtual ground" and wont let audio leak.
Input impedance is r1.
output impedance is near 0 ohms.
NE5532 is a lo-noise OPAmp (< $0.75 at digikey,
        more some places, less others)
741 is standard (noisy) op-amp, very cheap.
both "R1's" do not _have_ to be equal if you would like
different gain for each "audio"
for audio, I would keep the gain below 10. ( 5 , 2 or 1 work well)

>Can I just add a diode to the audio outputs to prevent the "back-feed"
>or is there something more to it???

No, diode won't work.


>Thanks for the input (no pun intended)
>Brettt Kollar
>[e-mail]


Regards,
Ed KB4ORA





From [e-mail] Sun May 19 14:04:23 1996
Newsgroups: rec.radio.amateur.homebrew
From: [e-mail] (Gary Coffman)
Subject: Re: Audio input/output
Message-ID: <[e-mail]>
Reply-To: [e-mail] (Gary Coffman)
References: <4n3cmv$[e-mail]>
Date: Sun, 12 May 1996 13:51:08 GMT

In article <4n3cmv$[e-mail]> [e-mail] (Brett Kol
lar) writes:
>I would like to send the output from two different audio sources to
>the same input device.  My consern is "back-feeding" one of the other
>output devices and I am looking for an easy way to prevent this.  The
>crude drawing below explains what I am really trying to say...
>
>Audio 1======|
>                             |
>                             ======= Input
>                             |
>Audio 2======|
>
>Can I just add a diode to the audio outputs to prevent the "back-feed"
>or is there something more to it???

No, you can't just add a diode. Audio is not DC. A diode would just
halfwave rectify the signals and make them sound like crap.

What you want is called a *mixer*. A classic mixer has variable attenuators
feeding a common buss which is at a very much lower impedance than the inputs
to the attenuators. That low impedance buss is then in turn amplified by
an output amplifier with a very low input impedance and an output impedance
compatible with the device it is to drive. Usually a variation of the
common opamp circuit is used since it offers a "virtual ground" impedance
at its input. This reduces greatly the amount of signal that can flow in
through one attenuator and then back out through another.

If the two input signals are low level, then preamps are usually placed
before the attenuators, and these have sufficient S21 isolation to prevent
any backfeed problems.

Now if the two sources are fairly high power, and you can't afford to
discard that power, you have a problem. The circuit you need then is
called a hybrid combiner, and they are very hard to make work correctly
over a multi-octave range. You should probably rethink the problem at
this point.

If you can afford to discard the power, however, then you can use a
simple *bridging* circuit. In this circuit, you terminate each of the
sources in its design impedance (say 8 ohms for an audio power amplifier),
and then bridge across it with a high impedance (say a 10k ohm resistance).
You can then tie these bridging resistors together to form the combined
signal. That will then be amplified by a high input impedance  amplifier
and fed to the third device. Backfeed will be reduced in proportion to
the ratio of the terminating resistance to the bridging resistance, IE
in this case to 8/10,000ths or by -62 db.

The circuit looks roughly like this:

Audio 1======|---/\/\/\/\-------
             /     10k         |
             \                 |
             / 8 ohms          |
             |                 |
            _|_                x------> high impedance amp 3
            ///                |
                               |
                               |
                               |
Audio 2======|-----/\/\/\/------
             /      10k
             \
             / 8 ohms
             |
            _|_
            ///


Gary
--
Gary Coffman KE4ZV          |    You make it,     | Due to provider problems
Destructive Testing Systems |    we break it.     | with previous uucp address
es
534 Shannon Way             |    Guaranteed!      | Email to [e-mail]
Lawrenceville, GA 30244     |                     |


From [e-mail] Sun May 19 14:04:24 1996
From: [e-mail] (Ted Busky)
Newsgroups: rec.radio.amateur.homebrew
Subject: Balun Article
Date: Sun, 12 May 96 08:55:25 EDT
Message-ID: <[e-mail]>

Some months ago there was an article either here or in the antenna group about
design notes for baluns. It was several pages long and included several test
type drawings of balun configurations. In addition, there were many suggestion
s
about winding style, bandwidth and materials. I don't recall the author either
.

I thought I printed a copy but now that I need it, I can't find it.

Please email me or post on the group.

Thanks, Ted.


From [e-mail] Sun May 19 14:04:25 1996
From: [e-mail] (Sir Barry Duxbury)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: BIG Resistors
Date: Tue, 14 May 1996 10:12:55 +0100
Message-ID: <4n9uht$[e-mail]>
References: <4n8q5a$[e-mail]>

In message <4n8q5a$[e-mail]>
        Chuck Bland <[e-mail]> writes:

> I am building a 450 ohm, non-inductive dummy load. I found what appears
> to be a surplus load. It have 4 black "tubes"; 2 each in parallel with
> the two pairs in series. Looks like it is close to what I am looking for.

Chuck, They are almost certainly non-inductive, especially if you can
see no trace od a winding under the black finish.

73 de G4GAH




--
 Barry Duxbury
[e-mail]
100031.2223@compuserve



From [e-mail] Sun May 19 14:04:26 1996
From: [e-mail] (Jim Potter)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: BIG Resistors
Date: Tue, 14 May 1996 15:06:14 GMT
Message-ID: <[e-mail]>
References: <4n8q5a$[e-mail]>

Chuck Bland <[e-mail]> wrote:

>I am building a 450 ohm, non-inductive dummy load. I found what appears
>to be a surplus load. It have 4 black "tubes"; 2 each in parallel with
>the two pairs in series. Looks like it is close to what I am looking for.
>
>I want to know if the resistors are non-inductive. Again, they are black
>tubes, about 2 inches in diameter and over 14 inches long. There are some
>markings. They are:
>
>Carborudum Co.
>892 SP451K
>450 Ohms  P/M 10%
>750 Watts
>
>Anyone have any clues about these BIG resistors?
>
>Chuck Bland - n6dbt
>Sacto, CA
>
>
You're in luck.  These are non-inductive resistors made of bulk
material.  Carborundum is now owned by CESIWID (or something like
that)  if you want more info.  I don't have my catalog handy, but the
only other information they would have that you don't already know is
the peak voltage and the peak energy ratings which are useful for
pulse applications. but don't matter for rf.

One caveat is that the resistors are slightly nonlinear with voltage
and they increase in resistance when the get hot (as much as 20%).

None of this matters much for an rf load.

73 de K9GXC, Jim


James M. Potter, President              TEL: [phone]
JP Accelerator Works, Inc.              FAX: [phone]
2245 47th Street                        EMAIL: [e-mail]
Los Alamos, NM 87544-1604               URL: http://www.jpaw.com/jpaw/



From [e-mail] Sun May 19 14:04:27 1996
From: [e-mail] (WB3U)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: capacitor value?
Date: Thu, 16 May 96 21:22:44 GMT
Message-ID: <4ngaf8$[e-mail]>
References: <[e-mail]> <4nflfg$[e-mail]>

   [e-mail] (Dave Bullock) wrote:

>I am trying to identify the value of the variable capacitor used
>in a 6metre stripline filter as depicted in ARRL handbook
>interferance section.  The capacitor in question is a Hammarlund
>HF-30-X.

This capacitor is a 30 uuF single-section.  The "X" suffix designates
that it is a wide-spaced version with a 0.045" air gap.

73,
Jack  WB3U


From [e-mail] Sun May 19 14:04:28 1996
From: [e-mail] (Mike Keitz)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: DPM REQUIRES isolated voltage?
Date: Mon, 13 May 96 15:37:50 GMT
Message-ID: <4n7kp4$[e-mail]>
References: <[e-mail]>

In article <[e-mail]>,
   [e-mail] (Myron A. Calhoun) wrote:
>I recently purchased two of the little 199.9 mv full-scale 3-1/2 LCD
>digital panel meter modules that sell for $10 each and was surprised to
>learn that they can NOT measure the same voltage which powers them--in
>other words, they MUST have an "isolated" power-supply voltage.  Of
course,
>I can always use a 9-volt "transistor" battery, but I wanted to used them
>to monitor emergency (battery) power supplies, and needing another battery
>is "the pits"!
>
>Any suggestion(s)?  Did I purchase the wrong module?  (I received "PM-128"
>from an unknown manufacturer.)

The specification to look for is "common mode input voltage".  Assuming
they have a differential input (in+ and in- terminals), there is a limit on
 what voltage can exist between the two inputs and the power supply (the
meter reads the difference between the two, but it will malfunction if the
absolute voltage on either is out of the common mode range).  Most likely,
the in- (or maybe in+) terminal is connected by a low impedance to the
power supply, either minus supply, plus supply, or halfway inbetween.

The way to find that would be to short the inputs together, supply power
and measure the voltage between the inputs and the supply with another
meter.  Check which pin, if either, tries to sink or source current.  Then
set things up so that the common mode voltage at the inputs is the same as
it's natural value.  The resistor divider that scales the 12V (or whatever)
battery to less than 200 mV can be connected in various ways so the
common-mode input voltage is correct.

-Mike KD4QDM


>
>--Myron.


From [e-mail] Sun May 19 14:04:29 1996
From: [e-mail] (Terry Fugate)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: DPM REQUIRES isolated voltage?
Date: 13 May 1996 13:55:41 GMT
Message-ID: <4n7f0t$[e-mail]>
References: <[e-mail]>

In article <[e-mail]>, [e-mail] (My
ron A. Calhoun) says:
>
>I recently purchased two of the little 199.9 mv full-scale 3-1/2 LCD
>digital panel meter modules that sell for $10 each and was surprised to
>learn that they can NOT measure the same voltage which powers them--in
>other words, they MUST have an "isolated" power-supply voltage.  Of course,
>I can always use a 9-volt "transistor" battery, but I wanted to used them
>to monitor emergency (battery) power supplies, and needing another battery
>is "the pits"!
>
>Any suggestion(s)?  Did I purchase the wrong module?  (I received "PM-128"
>from an unknown manufacturer.)
>
>--Myron.
>--
># Five boxes preserve our freedoms:  soap, ballot, witness, jury, and cartrid
ge
># PhD EE; Associate Professor  [phone] work  532-7353 fax  [phone] ho
me
># NRA Life Member and Certified Instructor (Home Firearm Safety, Rifle, Pisto
l)
If the meter modules can share the power ground with the signal ground,
just use a 555, in the astable mode, followed by a diode to generate an
isolated volatage.  If the power ground and signal ground have to isolated,
use a 555 to drive a transformer, and rectify the output of that.  For
a general idea, check out the ARRL handbook and look at their nicad
carger that boasts the 12v from and automobile.  They use a 555 driving
a "totem pole" transistor output, followed by a voltage doubler, to get
+24(or so)V.  Drop the voltage doubler and either rectify or couple to
a transformer,...well you get the idea.  It is a bit of a hassle, but
worth the effort.
Good luck and fun monitoring



From [e-mail] Sun May 19 14:04:30 1996
From: Dave <[e-mail]>
Newsgroups: rec.antiques.radio+phono,rec.radio.amateur.antenna,rec.radio.amateur.homebrew,rec.radio.shortwave,rec.radio.swap
Subject: For Sale- Rider Manuals & SAMS
Date: 18 May 1996 13:57:17 GMT
Message-ID: <4nkkvt$fqt$[e-mail]>

Hello Friends,

I have several Rider Perpetual troubleshooting manuals for Radio
and Televisions for sale. I also have a nearly complete set of
SAMS Photofact of the month series until the year 1991. This from
my Father's business which I closed a few years ago. The overall
condition of the Rider manuals are good, as well as most of the
sams folders. If you have any interest in all or part of these
sets, please respond by E-Mail to [e-mail] , OR
[e-mail]

Thanks for your time

Dave Skalish


From [e-mail] Sun May 19 14:04:31 1996
From: Albert Lee Mitchell <[e-mail]>
Newsgroups: comp.robotics.misc,comp.home.automation,sci.electronics.misc,rec.radio.amateur.homebrew,rec.radio.amateur.misc
Subject: Re: Future postings of L.O.S.A ?
Date: Mon, 13 May 1996 15:29:26 -0700
Message-ID: <[e-mail]>
References: <[e-mail]>

Christer Johansson wrote:
>
> Hi,
>
> >Why are you posting this crap about stamps?  It costs me money
> >to download news and I can't pick and choose.  Who the Hell asked
> >you to do this?
> Deleted text....
> I understand that not everyone is using the STAMP but I think many
> people enjoy reading what could be done and maybe get som hints or
> inspiration for applications of their own or am I wrong ?
>
> Regards,

        I agree Christer, even those of us who don't use the Basic
Stamp are interested.  And congratulations on your self-control.  I
sometimes find it difficult to hold my tongue with the rude and
nasty whiners here.

        Please post more, not less!

-- Regards, Albert

----------------------------------------------------------------------
AM Research, the Embedded Control Experts.   http://www.amresearch.com
----------------------------------------------------------------------


From [e-mail] Sun May 19 14:04:32 1996
From: [e-mail] (Jurkat)
Newsgroups: comp.robotics.misc,comp.home.automation,sci.electronics.misc,rec.radio.amateur.homebrew,rec.radio.amateur.misc
Subject: Re: Future postings of L.O.S.A ?
Date: 14 May 1996 13:44:45 GMT
Message-ID: <4na2od$[e-mail]>
References: <[e-mail]>

The Stamp Faq is done very well and I like to see it here every month.
Perhaps Mr/Ms Anonymous should quit playing with the anonymous servers
and find a real ISP and get rid of that 300 baud modem. Netscape is
pretty slick these days. :-0
Alternatively LOSA can be reduced to a one page summary with just the
http or ftp pointers and maybe an automated email return mailer (like
archie).

The main reason I like to see this faq is because with a Stamp a
person new to electronics can actually be up and running in a couple
of hours and that includes putting all the parts together on a
breadboard.
My stamp I works fine with my 8-bit PC running Dos 3.x and I had
a simple test program running inside 10 minutes. Most of the commands
are rather simple to use and it's a great way to get into building robots.
(I think this applies to most of the other newsgroups listed in this
post's header.)

Also I would like to thank Christer and others like him for their
time and effort in providing these faqs for the rest of us.  It sure
helps us a great deal with our hobby or work projects. Thanks!

dj

In article <[e-mail]> [e-mail] writes:
>Hi,
>
>>Why are you posting this crap about stamps?  It costs me money
>>to download news and I can't pick and choose.  Who the Hell asked
>>you to do this?
>
>Received several of the above e-mail from a person who didn't like
>to give his name or e-mail address, he used an anonymous-remailer !
>
>However I would like to hear if others feel the same about L.O.S.A
>and if thats the case I will stop posting it.
>
>I understand that not everyone is using the STAMP but I think many
>people enjoy reading what could be done and maybe get som hints or
>inspiration for applications of their own or am I wrong ?
>
>Regards,
>
>/Christer
>
>-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
> * High Tech Horizon  -  Christer Johansson  -  E-mail: [e-mail] *
>-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
> * Vi saljer Parallax, Inc. BASIC Stamp's produkter i Skandinavien *
>     >>  World Wide Web On-Line Catalog - http://www.hth.com  <<
>-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
>




From [e-mail] Sun May 19 14:04:33 1996
From: [e-mail] (Wes Stewart)
Newsgroups: comp.robotics.misc,comp.home.automation,sci.electronics.misc,rec.radio.amateur.homebrew,rec.radio.amateur.misc
Subject: Re: Future postings of L.O.S.A ?
Date: Tue, 14 May 1996 17:53:55 GMT
Message-ID: <4nahcs$[e-mail]>
References: <[e-mail]>

[e-mail] (Christer Johansson) wrote:

>Hi,

>>Why are you posting this crap about stamps?  It costs me money
>>to download news and I can't pick and choose.  Who the Hell asked
>>you to do this?

>Received several of the above e-mail from a person who didn't like
>to give his name or e-mail address, he used an anonymous-remailer !

>However I would like to hear if others feel the same about L.O.S.A
>and if thats the case I will stop posting it.

>I understand that not everyone is using the STAMP but I think many
>people enjoy reading what could be done and maybe get som hints or
>inspiration for applications of their own or am I wrong ?

>Regards,

>/Christer

When I saw the article, I was able, without my mommy
helping me, figure out that it was a fairly large posting.

If this jerk would read, he could see the same and chose
not to load the article.

Keep posting, they are interesting, and something I
would like to try.



Have a wonderful day - I don't work for Internet America

Wes Stewart
E-Mail  :  [e-mail]
WWW site:  www.webcell.com/wstewart



From [e-mail] Sun May 19 14:04:34 1996
From: [e-mail] (Floyd Brown)
Newsgroups: comp.robotics.misc,comp.home.automation,sci.electronics.misc,rec.radio.amateur.homebrew,rec.radio.amateur.misc
Subject: Re: Future postings of L.O.S.A ?
Date: 12 May 1996 17:35:19 GMT
Message-ID: <4n57gn$[e-mail]>
References: <[e-mail]>

In article <[e-mail]>, [e-mail] says...
>
>Hi,
>
>>Why are you posting this crap about stamps?  It costs me money
>>to download news and I can't pick and choose.  Who the Hell asked
>>you to do this?
>
>Received several of the above e-mail from a person who didn't like
>to give his name or e-mail address, he used an anonymous-remailer !
>
>However I would like to hear if others feel the same about L.O.S.A
>and if thats the case I will stop posting it.
>
>I understand that not everyone is using the STAMP but I think many
>people enjoy reading what could be done and maybe get som hints or
>inspiration for applications of their own or am I wrong ?
>
>Regards,
>
>/Christer
>
>
I don't mind as long as you don't post the same hints, i rather enjoy them
--
Floyd of Fort Brown
Procrastination is my game



From [e-mail] Sun May 19 14:04:35 1996
From: [e-mail] (Floyd Brown)
Newsgroups: comp.robotics.misc,comp.home.automation,sci.electronics.misc,rec.radio.amateur.homebrew,rec.radio.amateur.misc
Subject: Re: Future postings of L.O.S.A ?
Date: 13 May 1996 16:51:24 GMT
Message-ID: <4n7pac$[e-mail]>
References: <[e-mail]>

In article <[e-mail]>, [e-mail] says...
>
>Hi,
>
>>Why are you posting this crap about stamps?  It costs me money
>>to download news and I can't pick and choose.  Who the Hell asked
>>you to do this?
>
>Received several of the above e-mail from a person who didn't like
>to give his name or e-mail address, he used an anonymous-remailer !
>
>However I would like to hear if others feel the same about L.O.S.A
>and if thats the case I will stop posting it.
>
>I understand that not everyone is using the STAMP but I think many
>people enjoy reading what could be done and maybe get som hints or
>inspiration for applications of their own or am I wrong ?
>
>Regards,
>
>/Christer
>
sounds like he needs to check at&t or some other provider if he is in the
US, no reason to pay by message in this day and age!!
--
Floyd of Fort Brown
Procrastination is my game



From [e-mail] Sun May 19 14:04:36 1996
From: [e-mail] (Scott Sidener)
Newsgroups: rec.radio.amateur.homebrew
Subject: GE MPS PROGRAMMING WANTED
Date: 17 May 1996 02:00:39 GMT
Message-ID: <4ngmk7$[e-mail]>

Hi,

I am looking for either a cable, schematic, software, instructions
or all of the above in order to be able to program my GE MPS handheld
radio.

Does anyone have any suggestions on how to get the equipment to do this?

I would really appreciate any comments.

Thanks,

Scott Sidener    N0WFL

[e-mail]



From [e-mail] Sun May 19 14:04:37 1996
From: [e-mail] (BadB)
Newsgroups: rec.radio.amateur.homebrew
Subject: Hamfests... S.E. Pa. Area...
Date: Mon, 13 May 96 23:11:49 GMT
Message-ID: <4n8fjl$[e-mail]>



Can anyone help me Im tring to find a ham fest in the Philadelphia area... Ie
chester county montgomery ..Delaware area...

Thanks !
z


----------------------------------------
Warning---- These ideas or thoughts have been provided to you for entertainmen
t uses
only....The use of these idea's can be dangerous if used improperly! Always us
e proper safety precautions when handling these thoughts or ideas...The prior
thoughts are fictional in nature...Any event that may happen after use of such
 ideas or thoughts is purely coincidental and the thoughts or ideas conveyed h
ere by the author or anyone consciously or unconsciously working with the auth
or can not be held responsible or irresponsible if said ideas are used or not
used consciously or unconsciously..Due t
o a dearth of original ideas this disclaimer is required
Use Caution when using any of the prior ideas!

--- "One Hundred Million Volts", he declared "Were Perfectly practicable"
Nikola Tesla 1899

--- "Why does my Cat Lick my Toes? or for that matter why does it lick my leat
her shoes?"
MattZ 1996
----------------------------------------------------



From [e-mail] Sun May 19 14:04:38 1996
From: [e-mail] (Brian Prendergast)
Newsgroups: rec.radio.amateur.homebrew
Subject: help needed
Date: Tue, 14 May 1996 12:32:13 -0500
Message-ID: <[e-mail]>

Here the situation, I'm just starting in on this radio thing and I'm having
a problem figuring out what is best.  I started with a couple of 49 MHZ
radio shat in pocket communicators so I could play paintball and talk to
another member of my team at the same time.  I quickly found out that the
refs use the same frequency and that the rang and clearity wasn't that
good.  I nneded something that would work better since I didn't have time
to play around with things while I was playing paintball.  I also tryed to
use these in the car since we travel in multiple cars a lot and I thought
it would be nice to be able to talk to each other.  At any rate this didn't
work.  I returned them and figured I would give a CB a shot.  It started
out really good, then I realized that the CB (a hand held one) would be
great for paintball, but not very good for the car since it picked up every
little electronic devise in my car, since I have a stereo well over $1000
and an alarm to guard it along with a radar detector to watch for police oh
and I can't forget about the pager and cell phone.  Anyway you get the
point, I'm into electronics.  So now I hear all about these HAM radios, and
VHF.  How far can they reach and what kinds are the best, how much do they
cost, where can I get them, are there a lot of people using them?  You get
the idea, I have no clue about them.  I know I need a licencse and that's
about it.  Some one has been a great help to me so far, any more help would
be greatly appreciated.  I am extreamly interested in what the benefits are
off having the VHF as opposed to the CB.  Well please get back to me, one
of the more important things is cost and range.  I want to creat a docking
station for it for my home and for my pickup truck.  I am very interested
on how far people think they can go.  Please email me at
[e-mail] with any help.  I don't read these all the time
so I would probibly miss any resonse to this.  Thanks for any help at
all......


From [e-mail] Sun May 19 14:04:41 1996
From: P Tyers <[e-mail]>
Newsgroups: rec.radio.amateur.antenna,rec.radio.amateur.homebrew
Subject: Re: HOW DO U CONNECT COAX TO QUAD????????
Date: Fri, 10 May 1996 14:08:58 +1100
Message-ID: <[e-mail]>
References: <[e-mail]> <[e-mail]>

Monty Wilson wrote:
>
> [e-mail] (Bill Poston) wrote:
> >I am attempting to homebrew a quad antenna. I have read Cubical Quad
> >Antennas by W6SAI and the ARRL Antenna Book. Neither answers my question.
> >
> >How do I connect one coax feedline to the multiple loops on the driven
> >element?
> >
> >Please explain in detail so that a dummy can understand.
>

Have another read of Cubical Quads. What you actually end up
doing is producing a multiple gamma match, one for each loop.
Of course they interact to all heck while being adjusted.I
seem to recall that the preferred order of adjustment was
from smallest loop to largest loop for minimum interaction -
BUT I COULD BE TOTALLY WRONG ON THIS.

 Another source of information is a series of articles
published in the Wireless Institute of Australia magazine
"Amateur Radio" about 15 +/- 5 years ago on multiband quads
which had several column inches on the care and feeding of
these gamma matches.

Hope this helps!

--
P Tyers, Tel. [phone]
AARnet: [e-mail]
CSnet: [e-mail]    HAM: VK3KTS
MAIL: Telstra Research Laboratories,P.O. Box 249,
      Clayton,VICTORIA 3168,AUSTRALIA


From [e-mail] Sun May 19 14:04:42 1996
From: [e-mail]
Newsgroups: rec.radio.amateur.antenna,rec.radio.amateur.homebrew
Subject: Re: HOW DO U CONNECT COAX TO QUAD????????
Date: 11 May 1996 05:45:45 GMT
Message-ID: <4n19i9$[e-mail]>
References: <[e-mail]> <[e-mail]> <[e-mail]>
Reply-To: [e-mail]

In <[e-mail]>, P Tyers <[e-mail]> writes:
>Monty Wilson wrote:
>>
>> [e-mail] (Bill Poston) wrote:
>> >I am attempting to homebrew a quad antenna. I have read Cubical Quad
>> >Antennas by W6SAI and the ARRL Antenna Book. Neither answers my question.
>> >
>> >How do I connect one coax feedline to the multiple loops on the driven
>> >element?
>> >
>> >Please explain in detail so that a dummy can understand.
>>
>
>Have another read of Cubical Quads. What you actually end up
>doing is producing a multiple gamma match, one for each loop.
>Of course they interact to all heck while being adjusted.I
>seem to recall that the preferred order of adjustment was
>from smallest loop to largest loop for minimum interaction -
>BUT I COULD BE TOTALLY WRONG ON THIS.
>
> Another source of information is a series of articles
>published in the Wireless Institute of Australia magazine
>"Amateur Radio" about 15 +/- 5 years ago on multiband quads
>which had several column inches on the care and feeding of
>these gamma matches.
>
>Hope this helps!
>
>--
>P Tyers, Tel. [phone]
>AARnet:        [e-mail]
>CSnet: [e-mail]    HAM: VK3KTS
>MAIL: Telstra Research Laboratories,P.O. Box 249,
>      Clayton,VICTORIA 3168,AUSTRALIA

You're right on target!  Highest to lowest frequency.

It takes some juggling.

However, once done, the match stays done.

I've used the gamma match feed system on quads (and virtually everything
else I can reasonably adapt it to.  It works on the quads VERY well.

Another tip.  In stead of chasing all over heck and back for big variable
capacitors as you get down to 40 and 80 meter quads, use a chunk of RG-8
coax cable as a capacitor.  It has capacity and a nice hefty dialectric that
will let you use the inner conductor as one arm of a capacitor and the
outer shield as the other arm.  You get it too long by a foot or so for the
total capacity you need.  You whackem off an inch or so at a time at lower
power to trim away the capacitance.  You use a much smaller air variable
for the trimmer.

When done, presto, BIG heavy cap for 40 and 80 meter versions heap cheapo.

Be sure to trim away some of the braid and leave an inch or so of the inner
conductor and insulation extended to avoice arcing at high power....

Tape the end up to excude water.

Smile all the way to the bank.

:)

Mike W5WQN as a guest at leviathan.tamu.edu (No mail address there)



From [e-mail] Sun May 19 14:04:43 1996
Newsgroups: rec.radio.amateur.antenna,rec.radio.amateur.homebrew
From: "Al Koblinski  (W7XA)" <[e-mail]>
Subject: Re: HOW DO U CONNECT COAX TO QUAD????????
Message-ID: <[e-mail]>
To: [e-mail]
References: <[e-mail]>
Date: Thu, 9 May 1996 23:56:14 GMT

I use a 1:1 balun for each loop (Bencher, but any brand is OK).
Where needed I used a coax matching section to match.
On 20mtr, my 3 el on 26' boom was 49 ohms so no matching was needed for
50 ohm coax.
Ditto for 5 el on 15 mtrs with same boom.
10 meters, 5 elements came out to near 90 ohms impedence and I used a
section of 75 ohm coax between the balun and the 50 ohm feedline.
Each element is fed seperately through a switchbox.
I have used a variety of other feed methods in the past, such as gamma
matching (cumbersome) and found that the simple balun approach works
great and is mechanically the most simple.
73, Al




From [e-mail] Sun May 19 14:04:44 1996
From: K. Skoupy
Newsgroups: rec.radio.amateur.homebrew
Subject: ICOM 775 DSP - Extented TX-Mod for this Tranceiver needed !
Date: Mon, 13 May 1996 19:02:53 GMT
Message-ID: <4n813s$[e-mail]>





From [e-mail] Sun May 19 14:04:45 1996
From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: ICOM 775 DSP - Help ! Need extented TX-Mod
Date: Mon, 13 May 1996 19:02:54 GMT
Message-ID: <4n813t$[e-mail]>





From [e-mail] Sun May 19 14:04:45 1996
From: [e-mail] (Karl Skoupy)
Newsgroups: rec.radio.amateur.homebrew
Subject: Icom 775 DSP : TX-Mod Wanted
Date: Mon, 13 May 1996 19:02:56 GMT
Message-ID: <4n813v$[e-mail]>





From [e-mail] Sun May 19 14:04:47 1996
Newsgroups: rec.radio.amateur.homebrew
From: [e-mail]
Subject: LM-383 Amp Kit
Message-ID: <[e-mail]>
Date: Sat, 18 May 96 07:24:39 EDT


Hi Homebrewers,
  I recently ran a circuit board for a customer that included a 7 watt audio
amplifier. The amplifier uses the LM-383T chip and includes the support
components shown in the National data sheet. Board dimensions are ~ 2" x 2.5"
and the board is double sided plated thru G-10 (high quality). If anyone is
interrested in one of the extra boards the price is $7 + shipping. A complete
kit, including the board all components, heat sink and connectors (pc connecto
r
and its mate) is available for $16 + shipping.

Thanks,
-Chris WA3LDI
e-mail [e-mail]





From [e-mail] Sun May 19 14:04:47 1996
From: [e-mail] (Tim Taylor)
Newsgroups: rec.radio.amateur.homebrew
Subject: Mods for HR-2600 Uniden Wanted
Date: Mon, 13 May 1996 21:31:37 GMT
Message-ID: <4n8649$[e-mail]>

Looking for mods for the Uniden HR-2600.

The pin's 34 and 35 are not tied on this model and 35 has two ground
strips.

Also need dip switch setting for 100hz tone.

Thanks

Please reply by E-Mail

[e-mail]

Thanks Again



From [e-mail] Sun May 19 14:04:48 1996
From: [e-mail] (WB3U)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Nail polish as coil dope??
Date: Thu, 09 May 96 04:13:25 GMT
Message-ID: <4mrvf4$[e-mail]>
References: <4mqqic$[e-mail]>

   [e-mail] (Yin Lung Shih) wrote:

>Is clear nail polish (apparently composed of two kinds of acetate and
>solvent) acceptable as coil dope?  I'm building a project and thought
>I had read somewhere that it was so I used some on four coils.  I
>checked the inductances and they measured the same before and after,
>but I wasn't able to check for possible Q degrading effects.  After I
>soldered the coils in, I got some real Q-dope.  Now I'm wondering if
>I should pull those coils and rebuild them. Any comments?

Rebuilding those coils would be a major waste of time.  Fingernail
polish work just fine for this.  Its only drawback is that it may not
adhere as well as an actual adhesive, and it tends to be brittle.  If
you used enough so that it soaked into the coil, between the turns,
neither of these characteristics is likely to cause a problem.

73,
Jack  WB3U


From [e-mail] Sun May 19 14:04:49 1996
From: [e-mail] (Kelly Gray)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Nail polish as coil dope??
Date: 13 May 1996 13:25:55 GMT
Message-ID: <4n7d93$[e-mail]>
References: <4mqqic$[e-mail]> <4mrvf4$[e-mail]> <[e-mail]> <4n70b7$[e-mail]>

Roy Lewallen ([e-mail]) wrote:

: I never have figured out how applying coil dope would improve a coil. The
: best quality dope will degrade the Q by decreasing the apparent inductance
: due to increased capacitance. Many other materials used for dope will
: introduce loss as well. Maybe someone could enlighten me.

As near as I can figure, the only advantage of coil dope is that it
mechanically secures the turns of wire. Without the dope, it is possible
for the wire in a loosely wound coil to shift, changing the coil inductance.

This is probably best prevented by winding the coil turns as tightly as
possible, and as neatly as possible, thus making it difficult for any
movement of the wire. If the coil is wound with small diameter wire, a
drop or two of adhesive securing the ends of the coil is probably a good
idea.

     <o_o>
     Kelly Gray  ve3vgp@ve3inf.#scon.on.ca  (packet)
                 [e-mail]    (internet)



From [e-mail] Sun May 19 14:04:51 1996
From: [e-mail] (WB3U)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Nail polish as coil dope??
Date: Mon, 13 May 96 17:29:19 GMT
Message-ID: <4n7vkm$[e-mail]>
References: <4mqqic$[e-mail]> <4mrvf4$[e-mail]> <[e-mail]> <4n70b7$[e-mail]> <4n7e1a$[e-mail]>

I recently wound a plate choke for a linear amplifier using 26 gauge
magnet wire on a ceramic form.  After it was wound, I gradually
removed turns from one end so that the internal series resonances of
the choke didn't fall on any of the ham bands.  The choke ended up
with resonances at about 26.5 MHz, 33 MHz, and several others above
that frequency.  The highest I measured (with a GDO) was about
120 MHz.

When the adjustment was complete, I secured the loose end of the coil
with a dab of superglue, then I dipped the whole coil in polyurethane
varnish.  After the varnish dried, I went back and checked all the
resonances again.  If anything had changed as a result of the varnish,
it wasn't detectable by any means I had available.

For the ultimate in protection, a coil like this could also be soaked
or "painted" with polyester resin or epoxy.  Both of these are used as
the base in fiberglass, so the effect on Q should be minimal.

73,
Jack  WB3U


From [e-mail] Sun May 19 14:04:51 1996
Distribution: world
Newsgroups: rec.radio.amateur.homebrew
Subject: Palomar HF Tube Amp Quest
From: [e-mail] (Randal Olds)
Message-ID: <[e-mail]>
Date: Thu, 16 May 1996 06:37:00 -0640


GH>I've just purchased a Palomar HF Multi-Band Tube Amp at a
GH>HamFest. I can't find a model number on the unit to identify it.
GH>Palomar Electronics is no longer in business so they can't help
GH>me. Can anyone help me to identify the unit I have and a possible
GH>source for Schematics.

Yes send me an SASE..

KD8NV
---
 * SLMR 2.1 * ScrewDriver antennas = BIG signal


From [e-mail] Sun May 19 14:04:52 1996
From: [e-mail] (Rob Whitacre)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: PL tone decoder schematics?
Date: 14 May 1996 13:50:12 GMT
Message-ID: <4na32k$[e-mail]>
References: <4n8etj$[e-mail]>

In article <4n8etj$[e-mail]>, [e-mail] says...
>
>does anyone have any schematics for a PL tone decoder?
>I want to integrate one into a DTMF decoder I'm building.
>
>thanks
>-Bill
>
>______________________________________
>      http://www.netaxs.com/~god
>         CEO and chief Diety
>     Cracked Bell Communications
>--------------------------------------

Sorry, Bill, but there are already two "Bills" here in the United States who
have reserved the title of "God" for themselves.



From [e-mail] Sun May 19 14:04:53 1996
From: [e-mail] (God)
Newsgroups: rec.radio.amateur.homebrew
Subject: PL tone decoder schematics?
Date: Mon, 13 May 96 22:59:48 GMT
Message-ID: <4n8etj$[e-mail]>

does anyone have any schematics for a PL tone decoder?
I want to integrate one into a DTMF decoder I'm building.

thanks
-Bill

______________________________________
      http://www.netaxs.com/~god
         CEO and chief Diety
     Cracked Bell Communications
--------------------------------------


From [e-mail] Sun May 19 14:04:54 1996
From: [e-mail] (qrk)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: RF filter needed
Date: Wed, 08 May 1996 03:43:10 GMT
Message-ID: <4mp57j$[e-mail]>
References: <[e-mail]>

Larry West <[e-mail]> wrote:
>I need to block out a very strong local FM Broadcast station
>so I can receive a distant station on an adjacent channel.
>The receivers I have are not sufficiently selective to
>ignore the unwanted signal (or that signal is splattering
>everywhere!).

>The station I want is on 92.5Mhz, and the station I don't
>want is on 92.3Mhz.
>[snip]
>I'm willing and able to make it myself, but I need some
>values for the components, and some suggestions on
>recommended types of filters.

>I suppose a directional antenna would help, too, so I'll get
>out the 'ol Antenna Book, and check out those possibilities,
>too.

It might be a bit difficult building an LC filter for the above
situation.  The Q of the filter would have to be on the order of 460.
Plus, the skirts of the filters would have to be rather steep calling
for a multi-section design which equates to having an even higher Q
for the filter sections.  If you want to have fun, you can make a
tuned cavity out of 3 pound coffee cans.  A little funky, a bit lossy,
but educational.

Better that you try a directional antenna like a simple Yagi.  If you
live in an area with tall buildings or mountains, then a directional
antenna may be useless due to reflections.

-
Mark Chun  |  [e-mail]  |  Santa Barbara, CA



From [e-mail] Sun May 19 14:04:55 1996
From: [e-mail] (Max Froding)
Subject: RF Software
Date: 13 May 96 03:09:11 -0700
Message-ID: <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew

The filter software can be found at;

 http://members.aol.com/maxfro/private/tunkit2.html

 sorry about posting the wrong URL earlier.


From [e-mail] Sun May 19 14:04:56 1996
Newsgroups: rec.radio.amateur.homebrew
From: [e-mail] (Richard Arnold)
Subject: Seeking info on modulation xfmr
Message-ID: <[e-mail]>
Date: Mon, 13 May 1996 21:47:05 GMT


I know it's a long shot: I have an old Inca modulation transformer
from about 1936 which I'm trying to use in a newly-built AM xmtr.

Does anyone happen to have a spec sheet on this item?

Modulation transformer made by Inca (Phelps-Dodge) model N30A.

thanks for reading and 73,

Dick Arnold, W5VEC
[e-mail]


From [e-mail] Sun May 19 14:04:57 1996
From: [e-mail] (Michael E. Colley)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Source for homebrew receiver crystals
Date: 19 May 96 01:37:44 GMT
Message-ID: <[e-mail]!sneezy>
Reply-To: "Michael E. Colley" <sneezy![e-mail]>

Dave:

You can get 140 to 170 Mhz. receive crystals from Radio Shack easily
for radios that use 10.7 Mhz first IF.  They are even stamped with
the receive frequency (146.94 Mhz.)!

These crystals are in the vicinity of 15-16 Mhz fundamental.  I
oscillate them third overtone at 45-48 Mhz just like RS does in their
older pager radios no longer manufactured but crystals are still
easily available for every frequency I have ever asked for (about 30
frequencies so far).  I use a transformer link off the collector tuned
to that oscillator's third harmonic that gives me the first hetrodine
oscillator frequency I put into the receiver mixer.

All the Best - Mike Colley
--
Michael E. Colley   ND1R  [phone]
--backup#1: sneezy![e-mail]  - or -  CIS 103650,1720
--backup#2: Mike Colley   Austin, Tx 78753-4325 06 or 78714-2895
 ------------------------------------------------------------
|  Life is like a dog-sled team.  If you ain't the lead dog,  |
|  the scenery never changes.  --  Lewis Grizzard             |
 ------------------------------------------------------------


From [e-mail] Sun May 19 14:04:58 1996
From: [e-mail] (Dave Ercegovic)
Newsgroups: rec.radio.amateur.homebrew
Subject: Source for homebrew receiver crystals
Date: 17 May 1996 16:14:51 GMT
Message-ID: <4ni8lr$[e-mail]>

I've decided to play around homebrewing double & triple conversion
receivers in the upper VHF, lower UHF regions and need a source for
ones and twoes of those really oddball crystals needed to work in that
area.  I don't see them in the usual sources, Digikey, Mouser, Newark,
etc.

I guess I'm looking for that enthusiast who is selling them out of their
basement.

Any leads?

Regards,
Dave  [e-mail]



From [e-mail] Sun May 19 14:04:59 1996
From: [e-mail] (TANTONR)
Newsgroups: rec.radio.amateur.homebrew
Subject: surplus stores in Boston, Philadelphia????
Date: 13 May 1996 03:54:50 -0400
Message-ID: <4n6psa$[e-mail]>
Reply-To: [e-mail] (TANTONR)

I will be in Boston and Philadelphia in the next few weeks- can anyone
post the addresses or phone #'s of any surplus stores (you know, we
homebrewers need `em!) in those areas?

I will reciprocate by sending a copy of the NY State surplus store list I
have compiled.

TNX!
Tom,
VE3IEY  FN14sf


From [e-mail] Sun May 19 14:04:59 1996
From: [e-mail] (Harry H. Brown)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: surplus stores in Boston, Philadelphia????
Date: 14 May 1996 15:52:51 GMT
Distribution: world
Message-ID: <4naa8j$[e-mail]>
References: <4n6psa$[e-mail]>
Reply-To: [e-mail]

Tom,

You're sorta out of luck in the Philadelphia area. I know of a guy that has a
warehouse in Bridgeport, Pa., about 25 miles west of Phila. (near where I live
). He is not open on a regular basis. He does go to hamfests and usually is at
 Dayton. I'm not aware of anything else of significance in the area and I've l
ived here for over 25 years. Maybe some of your other responses will prove me
wrong.

73, Harry, W3IIT



From [e-mail] Sun May 19 14:05:00 1996
From: [e-mail] (Bob Applegate)
Newsgroups: rec.radio.amateur.homebrew
Subject: Tek scopes... what features?
Date: 10 May 1996 18:10:59 GMT
Message-ID: <4n00rj$[e-mail]>

I've been thinking about buying a good scope for my workbench.
Being a software person, I have never used one "professionally,"
so I don't know the various features/models available.  Because
of previous experiences, a Tektronics would be prefered, but
what are the advantages/problems of various models?

My basic requirements:

   * Dual trace
   * 20 MHz
   * Not overly expensive, like under $400.
   * Mainframe design seems nice since new features could
     be added later (one I figure out what they do).
   * Smaller size is prefered; a cart is definately out.

So, what are all these models?  I see lots of 561A, 7403N, etc.
What's a decent type?

Bob


From [e-mail] Sun May 19 14:05:01 1996
From: Ron Giuntini <rong@204.160.88.10>
Newsgroups: rec.radio.amateur.equipment,rec.radio.amateur.homebrew
Subject: Re: TenTec 2M->6M Xvrtr?
Date: 18 May 1996 04:42:54 GMT
Message-ID: <4njkge$[e-mail]>
References: <4ne7hm$[e-mail]> <4ni81k$[e-mail]>

As you are probably aware there is a review of the 14mhz to 50mhz xverter
in the June 96 QST. I just got my issue and have not yet read it, but you
may be able to get something from it that means something to you even
though you are interested in the 2M version.



From [e-mail] Sun May 19 14:05:02 1996
From: [e-mail] (Occolowitz John)
Newsgroups: rec.radio.amateur.equipment,rec.radio.amateur.homebrew
Subject: Re: TenTec 2M->6M Xvrtr?
Date: 17 May 1996 16:04:04 GMT
Message-ID: <4ni81k$[e-mail]>
References: <4ne7hm$[e-mail]>

In article <4ne7hm$[e-mail]>,
   [e-mail] (M. Monninger) wrote:
>Has anyone built the TenTec 2M-to-6M transverter? I'm thinking about buying
>one to get on 6M FM. I'd be interested in hearing opinions/experiences about
>it. If it's as good as the 20M-to-6M unit it should be worthwhile.
>
>Tks & 73....    Mark   AA7TA

I recently built one and am quite satisfied with it. My power meter indicates
12W into dummy load on FM. Phone help is good, I stupidly installed GASFET
upside down, Tenn TEC sent new one free of charge. Did take me quite a bit
more time to assemble than I expected. If you're short on time the assembled
price represents good value.

John O. KB9MIE.


From [e-mail] Sun May 19 14:05:03 1996
From: [e-mail] (WB3U)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Toriod power handling capacity
Date: Wed, 08 May 96 02:21:30 GMT
Message-ID: <4mp4h1$[e-mail]>
References: <4mnrne$[e-mail]>

Post / CC by Mail

   [e-mail] (Frank Ellesmere) wrote:

>Would appreciate formula(s) for calculating the HF power handling
>capacity of iron and ferrite toroids. Application is Pi-L for HF
>vacuum tube linear amplifiers.  I have seen designs where  L 2 is
>often a toroid up to 20Mhz and have seen designs where L1 is
sometimes a toroid in the same freq range.

There are two spreadsheets on my FTP site that might be of help
if you have Excel 4.0 for Windows or something compatible.  The
files are labeled Toroid.xls and Flux2.xls.  The FTP site is:
ftp.microserve.com/popaccts/h/jackl/

You can also get the formula from the Amidon flyer (catalog).
Their phone number is: [phone].  Note that the formula uses
only three factors in determining flux:  the cross-sectional area
of the core, the number of turns, and the voltage across the turns.
The maximum permissable flux varies by frequency but not by the
core material.  It is inversely proportional to the number of turns
though, so permeability affects the results because it will determine
the number of turns for a given inductance.

73,
Jack  WB3U



From [e-mail] Sun May 19 14:05:04 1996
From: "William E. Sabin" <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Toriod power handling capacity
Date: Fri, 10 May 1996 07:51:23 -0700
Distribution: world
Message-ID: <[e-mail]>
References: <4mnrne$[e-mail]> <4mp4h1$[e-mail]> <[e-mail]> <4muuuh$[e-mail]>

The Amidon data manual suggests values of flux *density* at various
frequencies to prevent overheating. Graphical info is also given. If the
flux density is limited to the values that they suggest, the number of
turns and the maximum applied voltage at a certain frequency can then be
calculated, using a formula derived from Faraday's law. These
"guidelines" are the *same* for iron and ferrite cores. The flux density
levels suggested are far below the saturation level and are based on a
combination of hysteresis, eddy current and dielectric losses per unit
volume, all of which increase rapidly with frequency. Saturation is not
the criterion for these suggested values of flux density, which for iron
is about 5000 Gauss and for ferrite about 2000 Gauss.

A further consideration is the value of inductive reactance at the lowest
frequency of interest. For a given core this determines the number of
turns. For a high permeability ferrite the required minimum number of
turns is very small and for a given value of applied voltage this can
cause the flux density to become too large and exceed the guidelines. If
we increase the number of turns the inductance becomes much much larger,
perhaps too large, and the Q can deteriorate, especially at the *high*
end of the frequency range. So for high power, broadband RF transformer
applications the larger, low permeability iron core or a low permeability
ferrite would be desirable.

For transmatch baluns the large iron core, or perhaps multiple stacked
cores, with a mu of 10 or 15 and many turns, seems to be the favorite,
perhaps also because of its higher saturation level (less intermodulation
distortion). This transformer will withstand fairly high voltages if it
is used within the suggested Amidon guidelines at the various
frequencies. If the core gets too warm (voltage too high), reduce the
voltage level, either by reducing the impedance level or the power level.

Further info is in an article in QEX for May 1995, which was written in
consultation with an Amidon engineer.

Bill W0IYH


From [e-mail] Sun May 19 14:05:05 1996
From: WD8DZB  (Dave Zawodny)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: TS-32 PL Decoder
Date: 12 May 1996 04:52:02 -0700
Message-ID: <[e-mail]>
References: <4n2q98$[e-mail]>
Reply-To: [e-mail]

[e-mail] (KC8CGX) wrote:

>Does anyone have the address for "Communication
>Specialists", or know the pricetag for their TS-32 PL
>Decoder?
>
>Doug
>KC8CGX
>
>_____________________________________________
>North Central Ohio Skywarn Info
>http://www.amnorth.com/redbone/skywarn.html
>http://www.amnorth.com/redbone/ham-page.html
>http://lrbcg.com/dougd
>
Doug,

Communications Specialists, Inc.
426 West Taft Ave.
Orange, CA 92665-4296
[phone] FAX (714) 974    3420
1-800-854-0547


The TS-32P Encoder-Decoder Was $ 57.95 (1-9), last time I bought
'em.

73,  WD8DZB


From [e-mail] Sun May 19 14:05:06 1996
From: [e-mail] (BadB)
Newsgroups: rec.radio.amateur.homebrew
Subject: Tube amp b+ slow ramp up ...any suggestions? Please?!
Date: Fri, 17 May 96 14:56:21 GMT
Message-ID: <4ni42l$[e-mail]>

Well I have a few confilcting idea about what to do... I am rebuilding a small

amp that I would like to slowly ramp up the b+ .... I could use a 5ar4 rect.
to do a slow ramp up, but I would like to put some silicon devices in there..
there is no place to mount a switch, so that idea is out.. I was just
wondering if anyone had any ideas on the subject?!?!
z

----------------------------------------
Warning---- These ideas or thoughts have been provided to you for entertainmen
t uses
only....The use of these idea's can be dangerous if used improperly! Always us
e proper safety precautions when handling these thoughts or ideas...The prior
thoughts are fictional in nature...Any event that may happen after use of such
 ideas or thoughts is purely coincidental and the thoughts or ideas conveyed h
ere by the author or anyone consciously or unconsciously working with the auth
or can not be held responsible or irresponsible if said ideas are used or not
used consciously or unconsciously..Due t
o a dearth of original ideas this disclaimer is required
Use Caution when using any of the prior ideas!

--- "One Hundred Million Volts", he declared "Were Perfectly practicable"
Nikola Tesla 1899

--- "Why does my Cat Lick my Toes? or for that matter why does it lick my leat
her shoes?"
MattZ 1996
----------------------------------------------------



From [e-mail] Sun May 19 14:05:07 1996
From: Gerhard Hoffmann <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Tuning Capacitor
Date: 9 May 1996 01:33:38 GMT
Message-ID: <4mri1i$[e-mail]>
References: <[e-mail]>

[e-mail] (Peter Alfke) wrote:
>
> I am looking for a source of good, old-fashioned tuning capacitors, the
> ones used in all radios before the age of varicaps.
> I want to build pulse generators with a 2.5 : 1 manual tuning range ( 100
> to 250 MHz ), and that is tough for varicaps. Any suggestions?

Varicaps aren't that bad.

Siemens BB811   8.8  .. 1.02 pF    at 1..28V
Siemens BB835   9.1  .. 0.62 pF    at 1..28V
Philips BB215   17   .. 2    pF    at 1..28V
MaCom   MA071   1.4  .. 0.1  pF    q=5000 GaAs


Gerhard Hoffmann




From [e-mail] Sun May 19 14:05:08 1996
From: Cecil Moore <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Tuning Capacitor
Date: 8 May 1996 22:36:03 GMT
Message-ID: <4mr7kj$[e-mail]>
References: <[e-mail]>

[e-mail] (Peter Alfke) wrote:
>I am looking for a source of good, old-fashioned tuning capacitors,

Hi Peter, Fair Radio Sales has a 3-gang, 540pf per gang, new for $10.
Part# ASP-074-048  [phone]

73, Cecil, KG7BK, OOTC  (not speaking for my employer)




From [e-mail] Sun May 19 14:05:09 1996
From: Cecil Moore <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Tuning Capacitor
Date: 8 May 1996 22:39:37 GMT
Message-ID: <4mr7r9$[e-mail]>
References: <[e-mail]> <4mr7kj$[e-mail]>

Cecil Moore <[e-mail]> wrote:
>[e-mail] (Peter Alfke) wrote:
>>I am looking for a source of good, old-fashioned tuning capacitors,
>
Whoops, just noticed the 100-250MHz. They also have a 2-gang, 14-78pf and
17-100pf with a 0.09 in. gap.




From [e-mail] Sun May 19 14:05:09 1996
From: [e-mail] (Ed Gallup)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Ultimate Cordless Phone
Date: Sun, 19 May 96 04:05:19 GMT
Message-ID: <4nm6gc$[e-mail]>
References: <4nkcvu$[e-mail]>

In article <4nkcvu$[e-mail]>, [e-mail] (Ron2DTwo) wro
te:
>Has anyone tried to convert an older cellular flip phone into a cordless
>phone?  Please advise.
>
>Ron

    Huh?   It doesn't have a cord does it?   Its a phone isn't it?   Then its
a cordless phone.....                    :>)





From [e-mail] Sun May 19 14:05:10 1996
From: [e-mail] (Darrell kimball)
Newsgroups: rec.radio.amateur.homebrew
Subject: variable capacitor
Date: Tue, 14 May 1996 14:35:21 GMT
Message-ID: <[e-mail]>

anyone know where I can buy or "get" a 3 section ,100 pf variable
capacitor? High voltage not needed. Thanks
E-Mail darrellk@ internetland.net


From [e-mail] Sun May 19 14:05:11 1996
From: [e-mail] (Mike Keitz)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Voltmeter using ammeter?
Date: Thu, 16 May 96 15:42:02 GMT
Message-ID: <4nfi1r$[e-mail]>
References: <4ne42c$[e-mail]> <[e-mail]>

In article <[e-mail]>,
   [e-mail] (Ed Ganger) wrote:
>In article <4ne42c$[e-mail]> [e-mail] (John
Lumkes) writes:
>>Hi, wondering if someone could tell me an easy way to
>>use my old ammeter (1 mA FS) to show 0-FS using only the
>>range of 11-14 volts. Is there an easy way to have the
>>scale reflect only this voltage range and not the
>>whole 0-14 volt range?
>
>Yes, Ascii schematic follows (use monospace font)
>
>
>
>   (+)  ---------|<|---------/\/\/\/\/\-----(meter)-------  (-)
>                 ZD1           R1             M1
>
>ZD1 is a zener diode at approximately your low voltage
>.... 9.1 volts is quitecommon. So if you use 9.1, the meter
>will read 9.1-FS

<snip computation of resistor value>

>for casual use (ie storage battery monitoring) this is adequate,
>but realize that a zener diode is not "flat" and that the
>voltage accross it can move about 1/2 v from "just conducting"
>to FS; that is why I would use 9.1 V and throw away all readings under
>about 10-11 V.

This circuit is a good start and will do the job, I can suggest two
enhancements:

(1) Put a forward-biased regular silicon diode in series with the zener
diode (the starting voltage will increase by 0.6 to 0.7 V over the zener
voltage).  This will counteract some of the variation of zener voltage with
temperature.  Also it will protect the meter if the circuit is hooked up
with the wrong polarity.  The regular diode will not conduct the reverse
polarity, thus the meter will stay at zero.  In the basic circuit, the
zener will go into forward conduction and flow several times the full-scale
current, slamming the needle against the zero pin.

(2) Shunt some current through the zener so the zener current is higher and
thus better regulated.  It would be nice to be able to make zener current
flow constantly (even when the battery voltage is less than the zener
voltage), but this would require a source of negative voltage.  In order to
keep the circuit simple just hook a resistor from the zener anode to the -
battery point.  Usually zeners work best with about 10mA forward current,
so design the resistor so the zener current is about that at the usual
voltage (12V).  This modified version will use more current from the
battery, so it may not be suitable for continuous monitoring.  Connect the
circuit to the battery through a momentary switch so current only flows
while reading.

In order to get more precision, a rather advanced circuit involving a
voltage regulator or reference and maybe an op-amp or two would be needed.
 This would have the advantage of being able to precisely set both the
starting and maximum voltages though.

-Mike KD4QDM



>
>Hope this helps.
>Regards,
>Ed KB4ORA


From [e-mail] Sun May 19 14:05:13 1996
From: [e-mail] (Tom Bruhns)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Voltmeter using ammeter?
Date: 16 May 1996 17:19:31 GMT
Message-ID: <4nfo33$[e-mail]>
References: <[e-mail]>

Ed Ganger ([e-mail]) wrote:

: for casual use (ie storage battery monitoring) this is adequate,
: but realize that a zener diode is not "flat" and that the
: voltage accross it can move about 1/2 v from "just conducting"
: to FS; that is why I would use 9.1 V and throw away all readings under
: about 10-11 V.

Ed's quite right about this.  Best would be to hand-calibrate the
meter, and also then realize that it won't be perfectly temperature-
stable, though probably adequate.  A couple other things you can do:
set the mechanical "zero" on the meter so with no current it's
below the scale "zero".  This will throw away the readings up to
that small current where the scale zero actually is.  Provide a
mark on the meter face where you've offset the pointer, so you can
reset it there if it gets out of adjustment.  Also, you can get
"adjustable zeners" or shunt regulators that are set with a pair
of resistors.  A TL431 _might_ work, though it's really designed
for more current.  You could actually put in a pot to adjust the
lower threshold voltage, and it's very "flat" with current.  But
it takes some current to bias the resistors.  Actually, this could
make a useful meter:  linear scale from zero up to 11 volts,
compressed in the first, say, 20% of the meter range, then
linear expanded scale from 11 to 15 over the top 80% of the meter's
range.

--
Cheers,
Tom
[e-mail]


From [e-mail] Sun May 19 14:05:14 1996
From: Piers Rochford <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: weather pics
Date: Mon, 13 May 1996 00:24:46 GMT
Message-ID: <[e-mail]>
Reply-To: [e-mail]


-- A plea for assistance:

   Does anybody know of any way to recieve the moving (tv) pictures
from the weather satalites.   I do not know which satalite this is
broadcast from but I do know that the CNN news network from the USA
use this display for their weather forcasts.

        Is it beyond the means of the average listener/viewer or can
ex commercial equipment or home build stuff be used??????????

Thanks in advance :-)

Piers.


     __________________________________________________________________

                          [e-mail]
     __________________________________________________________________





From [e-mail] Sun May 19 14:05:16 1996
From: [e-mail] (Terry Fugate)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: WEATHER PICS
Date: 14 May 1996 12:22:00 GMT
Message-ID: <4n9tt8$[e-mail]>
References: <[e-mail]>

In article <[e-mail]>, Piers Rochford <[e-mail].
co.uk> says:
>
>
>--
>A plea for assistance:
>
>   Does anybody know of any way to recieve the moving (tv) pictures
>from the weather satalites.   I do not know which satalite this is
>broadcast from but I do know that the CNN news network from the USA
>use this display for their weather forcasts.
>
>        Is it beyond the means of the average listener/viewer or can
>ex commercial equipment or home build stuff be used??????????
>
>Thanks in advance :-)
>
>Piers.
>
>     __________________________________________________________________
>
>                          [e-mail]
>     __________________________________________________________________
>
>
This probably really belongs in rec.radio.amateur.space (or sci.sat or
whatever).  I will keep this real short.  Contact the ARRL and get
Dr. Ralph Tagerts 3rd edition of his wx sat handbook.  Go to the
amsat ftp site and grab JVFAX 7.0 (7.0 and 7.1 are both on the net,
7.0 supports GIF images, 7.1 supports TGA(Targa), I prefer gif's).
You will need a vhf receiver(I use a Radio Shack Pro2004) and an outside
antenna.  A special antenna, with a preamp will give the best results,
but you can use a diskcone.  The receiver must at least have a wide band
width mode,  Ideally you need a receiver with 45/50KHz BW, but 75KHz(the
wide mode on the Pro2004/5/6) will work.  Hamtronics makes a dedicated
reciever.  If you are going the JVFAX route, you can use the "simplest"
decoder(a self powered opamp demodulator) with the Exar2201 "front end".
A wesat image is an AM signal on a FM carrier and you will need the
exar circuit to convert the AM signal into an FM signal.  I know that
this is confussing, but it will work.
If you have a soundblaster, the funet (in Finland) has two programs(Channel
and demo-ftv(this demo will not save but will display, it only cost
$10 to regester ftv and is well owrth it!) that "decode" the audio and
display a WEFAX image.  Channel(expands into ChannelX) has documentation
in Finish.  Do a web search for drig(Dallas Remote Imaging Group),
They have a lot of information on all aspects of space.  Drig has a
program, SBDSP that will convert a wav file(recorded with your sound
card) into a img file which you should be able to display with Aptcap40.
I have not had anyluck with the SBDSP route(but others have had good
results.  The Demo-ftv is great, good documentation etc.  ChannelX works,
but I can not read his docs.  JVFAX 7.0 (with the simple opamp and "front
end") work very well, even with a diakcone and a Pro12004.  The Tagert
book is full of information on both the low orbit and the Geosynch
"birds".  His section on displays is a litle dated(what isn't these days)
but the rest of the info will really help.  His simple antenna really
works.
I hope that this rather disjointed reply at least get you going in the
right direction.  While you will get the best results with the "proper"
equipment, you can get exciting results with simple equipment and start
on the road to better results by improving your equipment and knowlege
a step at a time.   I started out with JVFAX, a Pro2004 an a diskcone.
I imprved the antenna next( a "cut" turnstille with preamp), next
a real demodulator (a A&A mutlifax demod) and last an outboard IF strip
for the Pro2004.  My next upgrade will be a dedicated receiver.
Good Viewing!


From [e-mail] Sun May 19 14:05:17 1996
From: [e-mail] (Jim Weir)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: What makes crackle( wrinkle) paint crackle (wrinkle)??
Date: Mon, 13 May 1996 20:15:52 GMT
Message-ID: <4n85dq$[e-mail]>
References: <4hn3or$[e-mail]> <4n596a$[e-mail]>

[e-mail] (Jim Potter) shared the following priceless pearls of
wisdom:

>Heat.

I've gotten some good results by spraying a full wet coat of enamel
onto the surface to be wrinkled, letting it dry to tacky, then
spraying a thin coat of the same color lacquer over the enamel.  Sit
it in the sun for an hour and it will wrinkle.  Evidently the solvents
used for one attack the other.

Jim

Jim Weir VP Engineering | You bet your sweet patootie I speak for the
RST Engineering         | company.  If I don't, ain't nobody gonna.
Grass Valley CA 95945   |
http://www.rst-engr.com | AR Adv WB6BHI--FCC 1/C phone--Cessna 182A N73CQ
[e-mail]        | Commercial/CFI-Airplane/Glider-----A&P Mechanic



From [e-mail] Sun May 19 14:05:18 1996
From: [e-mail] (Clinton Peebles)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Wind up radio followup
Date: Tue,  7 May 1996 13:33:38 GMT
Message-ID: <[e-mail]>
Distribution: world

Here is the info I got from my question on the windup radio.

Windup Technology 206-783-2880  FAX [phone]
1-888-946-3871
email [e-mail]


From [e-mail] Sun May 19 14:05:19 1996
From: [e-mail] (Chuck Hanavin)
Newsgroups: rec.radio.amateur.homebrew
Subject: WTB 100TL's or 100TH's
Date: 8 May 1996 12:59:50 GMT
Message-ID: <4mq5s7$[e-mail]>

I am looking for preferably 4 or 5 good
100TL tubes. I will also consider 100TH's,
250TL's, or 250TH's.

I have for trade: cash, 833's, 4-440's, 4-125's,
809's, 2A3's, 6L6's, etc.


Chuck (WB3FJJ)  Email: [e-mail]



From [e-mail] Sun May 19 14:05:21 1996
Newsgroups: rec.radio.amateur.homebrew
From: [e-mail] (SARUMAN)
Subject: Re: WTB: Synths, Drum Machines & FX - analog or digital
Message-ID: <[e-mail]>
References: <4mkl9r$[e-mail]>
Date: Tue, 7 May 1996 20:27:18 GMT

>WTB: Synths, Drum Machines & FX - analog or digital

>Arp, Akai, Boss, Buchla, Crumar, Chroma, EDP, EML, EMS, Korg, Moog, Oberheim,
>Octave, PAIA, PPG, Roland, Serge, Sequential, Simmons, Yamaha, ETC...

>* Older stuff With or Without MIDI
>* Synthesizers - analog, modular, patchable, some digital, etc...
>* Drum machines, Ryhthm units - analog
>* Sequencers - CV & gate
>* Converter units - MIDI to CV & gate, etc
>* Sync units - Din Sync, etc.
>* Effects processors - tube, analog, digital
>* Vocoders
>* Effects pedals

>* Even Newer Stuff

>* Also Wanted: Recording Gear - Mics, Pre-amps, Processors, etc...

>* Anything else that falls under the electronic music realm...

>Please write back with a description of what you have...
>Thankyou.
>--
>6

I have an Akai VX-90 Synth Module, Roland MKS-50 Synth Module, EMU Drumulator
Drum machine, Roland TR-707 drum machine and a Tascam Porta 05 4 Track Tape
deck for sale. Also have a Charvel Strat Guitar with Midi Pickup and Guitar to
MIDI Converter. Make an offer on any or all.

<tsb>
                               Midgard Graphics
           3D Animation and Special FX for the hobbyist videographer
                          Email: [e-mail]

--
          Drop into #amigacafe on IRC's undernet for a chat sometime

--

<tsb>

                     A man of many hobby's master of none.




From [e-mail] Wed May 22 18:50:20 1996
From: [e-mail] (Kerry Banke)
Newsgroups: rec.radio.amateur.homebrew
Subject: Wanted: Manual/schematics for Austron Loran C Freq. Mon.
Date: 22 May 1996 20:30:31 GMT
Message-ID: <[e-mail]>

I have an Austron Loran C Frequency Monitor Model 2001F that I would like
to repair & put to use checking my home 10 MHz standard. Does anyone have
a manual or schematics for this unit?  - Kerry N6IZW -


From [e-mail] Wed May 22 18:50:20 1996
From: [e-mail] (WB3U)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: AM noise blanker-?possible
Date: Sun, 19 May 96 13:37:42 GMT
Message-ID: <4nncc3$[e-mail]>
References: <[e-mail]>

   [e-mail] (Ian Kaye) wrote:

>Most modern noise blankers work on SSB and not AM

Noise blankers for SSB work by detecting and suppressing wideband
impulse noise.  Ditto for AM.  I don't think there's a difference
in the circuitry; what works for one should work for the other.

73,
Jack  WB3U


From [e-mail] Wed May 22 18:50:21 1996
From: [e-mail] (Tobbe Frode SM5NPV)
Newsgroups: rec.radio.amateur.homebrew
Subject: Diplexer filters?
Date: 20 May 96 18:18:04 GMT
Message-ID: <[e-mail]>

How nows about designing diplexer filters? (Or any program fixing can do
this for
me?) There is a proceeding from 1987 Mid-Atlantic States VHF Conference by
Mr P. Drexler, called
"The Diplexer Filter: A Method for Enhancing Double Balanced Mixer
Performance", Anyone who knows
how to get my hands on that one?

73 de Tobbe, Suger Mike -land



From [e-mail] Wed May 22 18:50:22 1996
From: [e-mail] (D.W.Hemphill KC5NG)
Newsgroups: rec.radio.amateur.homebrew
Subject: WANTED:  B&W 3015 coils
Date: 21 May 1996 20:22:30 GMT
Message-ID: <4nt8m6$[e-mail]>

I need two, maybe three, B&W 3015 Miniductor coils for
a couple of transmitter projects I'm considering.

Anyone have these to sell me?

E-mail response to   [e-mail]

Thanks,
        Dean KC5NG



From [e-mail] Wed May 22 18:50:23 1996
From: [e-mail] (GECL)
Newsgroups: rec.radio.amateur.homebrew
Subject: Radio electronics magazine ?
Date: 17 May 1996 16:05:33 -0700
Message-ID: <4nj0nt$[e-mail]>


I am looking for tel/fax number of publisher of RADIO ELECTRONICS magaine,
would appreciate if anyone could advise.

Thanks

John
--
-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*



From [e-mail] Wed May 22 18:50:24 1996
From: [e-mail] (Don Montgomery)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: "Blue Steel Razor" radio?
Date: 17 May 1996 19:48:24 GMT
Message-ID: <4nil68$[e-mail]>
References: <4mt9mo$[e-mail]> <4mvi3n$[e-mail]> <4nhh92$[e-mail]>

Rod C. Johnson ([e-mail]) wrote:

> I'm a chemist by training and the idea of a 'solution' detector really
> intrigues me.  Any idea where I could find more information???

Seems to me it was a sharpened platinum point barely dipped into a tiny
cup of sulphuric acid.  Don't recall the acidic molar strength or what
the metal was to complete the circuit thru the acid.  Would assume it
was Pt also to keep from making a cell.

Don K6LTS
[e-mail]



From [e-mail] Wed May 22 18:50:25 1996
From: [e-mail] (Michael Fickenscher)
Newsgroups: rec.radio.amateur.equipment,rec.radio.amateur.homebrew,rec.radio.shortwave
Subject: Needed: FM stereo multiplex ICs
Date: 22 May 1996 17:33:15 GMT
Message-ID: <4nvj4r$[e-mail]>

As stated in the subject, I need to get my hands on a couple of stereo FM
multiplexor chips (and their appropriate demultiplexor IC).  Additional
requirement: must be cheap, as these are for weather balloons that I will
probably never see again after launch.

Please email me with any ideas on where I can get these chips.

--
    Michael Fickenscher -----------------------------------------------------
   Undergraduate Student,        Great wits are sure to madness near allied,
  Electrical Engineering        And thin partitions do their bounds divide.
 University of Nebraska-Lincoln         - Dryden, "Absalom and Achitophel"
------------------------/ [e-mail] /--------------------------


From [e-mail] Wed May 22 18:50:25 1996
From: Zack Lau <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: CB vs Marine VHF for mountain lakes
Date: Fri, 17 May 1996 15:32:22 -0400
Message-ID: <[e-mail]>
References: <4mrb8v$[e-mail]> <[e-mail]>
To: Jim Devenport <[e-mail]>

Jim Devenport WB5AOX wrote:
>
> My experience in this area is that there is little, if any, "bending" at
> any frequency above say 1.8 MHZ.  Radio waves travel mostly in straight
> lines except in the case of high or VHF signals which tend to "bounce"

I've talked to an EE professor who claimed that he has seen ships
on the Great Lakes far beyond normal LOS--optical ducting over
water.

The RSGB Microwave Handbook, volume I, talks about "evaporation
ducting"

Zack Lau KH6CP/1


From [e-mail] Wed May 22 18:50:26 1996
From: [e-mail] (Francesco Ledda)
Newsgroups: rec.radio.amateur.homebrew
Subject: Help ==> Old Fairchil ICs
Date: Mon, 20 May 1996 05:08:21 GMT
Message-ID: <4nonqo$[e-mail]>

Hello,

I am looking for the data sheets of two old (1970 or so ) digital ICs.

SL6907 (decade counter ??)

&

SL3143 (J-K FF??)

Thanks,

Francesco Ledda

PH 214-479-2751

Fax [phone].

[e-mail]



From [e-mail] Wed May 22 18:50:27 1996
From: [e-mail] (W8JI  Tom)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Saturation in toroid cores
Date: 22 May 1996 12:24:15 -0400
Message-ID: <4nvf3f$[e-mail]>
References: <4nu20t$[e-mail]>

In article <4nu20t$[e-mail]>, [e-mail] (Wilbert
Knol) writes:

>I always thought that in inductors, it is the current that generates
>the flux. As opposed to capacitors, where the voltage across the
>electrodes is responsible for the electric field.
>
>Wilbert, ZL2BSJ.
>
>

That is true Wilbert, but current relates to voltage and impedance. In
some cases voltage is easier to use, in some cases current is easier to
use.

The problem is either related to parallel reactance and voltage, or the
current. In any case, it eventually gets down to the flux density and
losses.

73 Tom


From [e-mail] Wed May 22 18:50:28 1996
From: [e-mail] (PFZouave)
Newsgroups: rec.radio.amateur.homebrew
Subject: WANTED: Data Transmitter Recommendations:
Date: 17 May 1996 14:50:32 -0400
Message-ID: <4nihpo$[e-mail]>
Reply-To: [e-mail] (PFZouave)

I am looking for a off-the-shelf, transmitter and receiver boards for
integration into a project Im working on, to replace the boards I
presently use. The idea is to transmit small packets of data (a dozen
bytes or so).

Requirements:

1) Must be cheap -- as cheap as possible. The boards Im trying to replace
run about 10 bucks a piece.
2) Must be low power. The boards Im replacing are 5v at 1.4 mA
3) I must be able to key the transmitter with an I/O pin from a
microcontroller.
4) The board should already be FCC approved.
5) Range? Up to 100 feet.

If you can direct me to a manufacturer, or better yet, a specific product,
I would be overjoyed. Please email any response. Pete.
/=====================================================/
/                                [e-mail]
                   /
/     The absurdity of a claim is not a valid measure of its probability
       /
/=====================================================/


From [e-mail] Wed May 22 18:50:29 1996
From: [e-mail] (Chauncy Gardener)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: RS232 -> CAT interface
Date: 22 May 1996 01:02:40 GMT
Message-ID: <4ntp3g$[e-mail]>
References: <4nmtse$[e-mail]>

Jean-Michel Friedt ([e-mail]) wrote:
: I recently bought a Yaesu FRG 8800. This receiver uses a
: CAT plug to connect to the serial port of my PC. Is there
: a way to find the Serial->CAT conversion circuit ?

: Thank you, Jean-Michel FRIEDT
:          [e-mail]

yes there is, if you have the latest qrz! cd-rom it's on there.  If not,
it should be on a number of web sites.  If you want I'll see if i can
locate it and send it to you via e-mail
j

 : --
: _______________________________________________________
: Jean-Michel FRIEDT [e-mail]
: http://www.ens-lyon.fr/~jmfriedt/index.html
: _______________________________________________________

--
*****************************************************************

There are no poor or children in the halls of congress.
                                                -common observation

Doing my part to piss off the christian right since 1986.
*******************************************************************


From [e-mail] Wed May 22 18:50:30 1996
From: [e-mail] (Ed Ganger)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: TMS320C30 assembler/compiler
Date: Sun, 19 May 1996 12:17:59 -0400
Message-ID: <[e-mail]>
References: <4njjkc$[e-mail]>

In article <4njjkc$[e-mail]> [e-mail] (Steve S
humway ) writes:
>From: [e-mail] (Steve Shumway )
>Subject: TMS320C30 assembler/compiler
>Date: 18 May 1996 04:27:56 GMT

>Hello,

>I'm looking for a public domain assembler and / or compiler for the
>Texas Instruments TMS320 DSP. I've seen references in several FAQ's on
>DSP's to an ftp site: schutz.ee.uts.edu.au I don't seem to be able to
>log on to this site (it's not there or some such stuff). Anyone got any
>ideas?

>Thanks

>Steve Shumway
>N8SHP

That assembler is for the 320c50. I have it, but it seems to need a LOT of
work. If anyone really wants it, i will put it (the zipfile) up
on my ftp :

ftp.mindspring.com   /users/eganger/t320as.zip

Should be there late on sun. nite.
Regards,
Ed



From [e-mail] Wed May 22 18:50:31 1996
From: [e-mail] ([e-mail])
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: UHF "grid" dip meter
Date: Fri, 17 May 1996 18:44:31 GMT
Message-ID: <4nihb9$[e-mail]>
References: <TtbcnuoWW$[e-mail]>
Reply-To: [e-mail]

[e-mail] (Herbert R Johnson) wrote:

>I'm building a radio telescope at 400 MHz. One of the problems I have is
>trying to tune it and balance it. Seems hard to find used gear that will
>work at 400 (not 440!) MHz. Most dip meters are lower - 200 MHz or less.
>In an older ARRL Handbook, I found a grid dip meter using a Nuvistor - 6CW4 -
>circuit good to several hundred MHz. It's interesting that it's hard to
>beat a vacuum tube for low input capacitance. The 6CW4 boasts a fraction of
>a pf for grid capacitance. This appears to keep the loading down on the
>resonant circuit and thus increases its sensitivity. So, a ham friend of
>mine is preparing to build it. I'm a digital EE so this UHF stuff is a bit
>out of my league - but it's a learning experience!

>Does anyone challenge the above statements? And can they offer a
>semiconductor alternative that would work as well? (Short of buying some
>umteen $$$$ piece of equipment.)

>Herbert R. Johnson                      voice/FAX [phone] day/nite
>[e-mail]                 Ewing, NJ (near Princeton) USA

>        occasional amateur astronomer at odd frequencies and hours
>   and senior engineer at Astro Imaging Systems: old photons to new bits!

6CW4's are going to be fun to find anywhere.  High input impedance?
Why?  If the Q of the whole system is too sharp, you might possibly
miss the dip.  Go for a vhf (or in this case) or uhf MOSFET.

Uncle Brian  VK6BQN




From [e-mail] Wed May 22 18:50:32 1996
From: Tom Lewis <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Doppler PC boards - $24.95
Date: 17 May 1996 18:46:30 GMT
Message-ID: <4nihi6$[e-mail]>


              >>>> SPECIAL LIMITED OFFER <<<<

     AB5CK Doppler PC Boards -  $24.95  (free shipping)

This high quality, professionally manufactured PC board is based
on the popular Roanoke Doppler design shown in the book entitled
"Transmitter Hunting - Radio Direction Finding Simplified".

 Special features:
   * On-board audio amp (used to reduce display variations).
   * 16 LED display.
   * Low signal level lockout circuit.
   * Numerous bypass capacitors to enhance overall operation.
   * Solder mask.
   * Silkscreen for easy component location and assembly.

Texas residents add 7.75% sales tax.
Free shipping (to most U.S. locations).

Payment:
U.S. Postal Money Orders will receive next day shipment.
Personal checks are welcomed (requires waiting period).

Tom Lewis
AB5CK Dopplers
6721 Rolling Hills Drive
N. Richland Hills, TX.  76180
Internet:   [e-mail]
Phone:      [phone]





From [e-mail] Wed May 22 18:50:33 1996
Newsgroups: rec.radio.amateur.homebrew
From: Robert Morris <[e-mail]>
Subject: Re: H.V. transformer
Message-ID: <[e-mail]>
References: <[e-mail]> <4nsteb$[e-mail]>
Date: Tue, 21 May 1996 21:05:27 GMT

Jim wrote:
>
> [e-mail] (jerry ) wrote:
> >I have a H.V. transformer that is rated @ 2350 volts. The transformer howev
er
> >does not have a curent rating on it. Is there a way to figure out what the
> >curent is?
>
> The best way I've found is to load it up and monitor the secondary voltage.
> When it starts to sag, you've found the saturation current.  If it blows up,
> you've found the maximum current rating of the windings.  But the only high-
> power high-voltage DC load I've ever found was an amp and a dummy load.  ;)
> Alternatively, you can measure the resistance of the primary and secondary
> and use Ohm's law, but this is highly imperfect and takes no effects of
> inductance or magnetic properties into account. (Hint: use a high-impedance
> ohmmeter.)
>
> I've heard of people hooking HV transformers up backwards and tying the
> primary to a parallel set of car headlights, monitoring that current, and
> adding headlights until they hit saturation.  A headlight burns at about
> 100 watts (~8 amps at 12 v).
>
> Rule of thumb: size of a six-pack = 500 watts, size of a 12-pack = 1500 watt
s,
> too heavy to lift = 3000+ watts.
>
> For SSB, you can get away with a remarkably small amount of iron to get a de
cent
> power level.  CW, FM, and RTTY require more iron.  A lot more. For dependabl
e
> service and long life, you might consider getting a transformer that is mark
ed for
> its ouput current.  (Yeah, Peter Dahl charges an arm and a leg.)
>
> N6OTQBill Orr's handbook --- "The Radio Handbook" speaks of weight as
to current..for amateur use. Remember you are going to get 1.4 x the
2350 as dc from the filter caps... Compare size to commercial
amps... SB220's Ameritron's etc..


From [e-mail] Wed May 22 18:50:35 1996
From: John Nordlie <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: "Blue Steel Razor" radio?
Date: Mon, 20 May 1996 14:08:03 -0500 (CDT)
Message-ID: <[e-mail]>
References: <4mt9mo$[e-mail]> <4mvi3n$[e-mail]> <4nhh92$[e-mail]> <[e-mail]>

This thread got me interested in crystal radios (again), so I
did a little snooping around the web.  Folks interested in crystal
sets may want to check out the Xtal Set Society home page at:

http://www.1stnet.net/~xtalset/

They have books and collections of their newsletter that contain info
on lead pencil detectors, electrolytic detectors, air coils, ferrite
coils, etc.  You can fill out a questionaire on the web site and they
will send you a free copy of their newsletter, which includes a catalog
and order form.  The copy I got had an article on making a crystal
headphone by growing a Rochelle Salt crystal, cutting it into pieces,
and assembling them in a cat food can (talk about serious homebrew!).
Those without web access can contact them at:

The Xtal Set Society
PO Box 3026
St. Louis, MO  63130
[phone]

Please note: I am not a member of this society, nor am I affiliated in
any way with them or their publisher.  I don't own any of their books,
and thus cannot comment on their quality or accuracy.


=======================================================================
John Nordlie   N0RNB                         University of North Dakota
#include <std.disclaimer.h>         Regional Weather Information Center

     C Program.                              "What's that?"
     C Program Run.                          "Looks like Phil Donahue
     Run, Dammit, Run!                        throwing up in a tuba."
                                                    -- Naked Gun 33 1/3


=======================================================================



From [e-mail] Wed May 29 23:48:04 1996
From: Chris FormyDuval <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: "Blue Steel Razor" radio?
Date: Tue, 28 May 1996 01:31:53 -0700
Message-ID: <[e-mail]>
References: <4nhh92$[e-mail]> <4mt9mo$[e-mail]> <4mvi3n$[e-mail]> <4nvfl6$[e-mail]>
Reply-To: [e-mail]

JOHN PHIPPS wrote:
>
> In a previous article, [e-mail] (Rod C. Johnson) says:
>
> >
> >Its your fault!!! I thought I got crystal radios outta my system last
> >year after my umpteenth attempt to build one failed.  Now I read about
> >chemical detectors and you got me started thinking about winding wire
> >and scrounging for earphones.
> >
> >I'm a chemist by training and the idea of a 'solution' detector really
> >intrigues me.  Any idea where I could find more information???
> >
> >Rod
>
> I'm virtually certain that the acid used was nitric; that a small gage
> Pt wire was used to barely touch the surface (when it did touch, the
> wire curled up). Whether surface tension of the acid (molality unknown)
> played a part I don't know. I was STRONGLY discouraged by my parents
> from messing with nitric acid....Can't remember the book I read this
> in, but it was ancient when I read it.

From a book on Deforest, he experimented with various detectors
including alcohol (maybe even beer), (it only worked for a few
minutes),and bunsen burner type flames before inventing the triode.
I think the name may be something like Deforest: Father of radio.
Hope this helps.
Chris


From [e-mail] Wed May 29 23:48:05 1996
From: [e-mail] (M. Monninger)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: 6 meter QRP
Date: 21 May 1996 20:24:02 -0700
Message-ID: <4nu1ci$[e-mail]>
References: <4np905$[e-mail]> <4nprv1$[e-mail]> <4nrh0i$[e-mail]>

In article <4nrh0i$[e-mail]>, [e-mail] (Don Stoner) wrote:
>Thanks Gordon, but I'm looking for a transceiver rather than a transverter. T
he
>
>newcomer (translation- no-coder) is not likely to have an HF rig of an sort.
>I'd like to encourage them to get on six meters SSB. Regards dls
>
TenTec also sells a 2M-to-6M transverter that's all mode. Newbies might be
more likely to have a 2M all-mode than an HF rig. Just a thought.

Mark    AA7TA


From [e-mail] Wed May 29 23:48:05 1996
From: "Edward N. McConnell" <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: 6 meter QRP
Date: Wed, 22 May 1996 22:12:39 -0500
Message-ID: <[e-mail]>
References: <4np905$[e-mail]> <4nprv1$[e-mail]> <4nrh0i$[e-mail]>

Don Stoner wrote:
>
> Thanks Gordon, but I'm looking for a transceiver rather than a transverter.
The
> newcomer (translation- no-coder) is not likely to have an HF rig of an sort.
> I'd like to encourage them to get on six meters SSB. Regards dls
>
> >Ten-Tec makes a world calss one. It is a transverter that takes 20 meter
> input.
> >While not a full radio at 8 watts out it is qrp.
> >
> >Gordon
> >AB5DG
> >
> >Gordon Couger Senior Software Specialist
> >Biosystems & Agricultural Engineering Dept.  Oklahoma State Univ.
> >114 Ag Hall Stillwater, OK 74075
> >[e-mail]


How about the 6M article in the QRP classic book on page 162 of the
first edition dated 1990?  I know it's not a kit but it might help.


Neil, KE4GOH EM64


From [e-mail] Wed May 29 23:48:06 1996
From: Michael Joseph <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: A/D Convertor for a PC
Date: Wed, 22 May 1996 09:49:14 -0300
Message-ID: <[e-mail]>

Does anyone out there know of an affordable A/D convertor board or kit for a P
C.

Ideally this device would have 8 or more channels and about .01V precision

Thanks for help

MJ


From [e-mail] Wed May 29 23:48:07 1996
From: [e-mail] (Greg Kendall)
Newsgroups: rec.radio.amateur.homebrew
Subject: ALINCO DJ-560 MODS
Date: 21 May 96 20:46:29 GMT
Message-ID: <[e-mail]>

any info on moding an alinco dj-560 ht for out of band xmit?  is it internal o
r
external (combination of buttons)?  also looking for path to users manual
document.

tnx de Greg

e-mail:   [e-mail]



From [e-mail] Wed May 29 23:48:08 1996
From: Charles Wenzel <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: AM modulator?
Date: Mon, 27 May 1996 19:42:10 -0700
Message-ID: <[e-mail]>
References: <4odd4b$[e-mail]>

There is a circuit for an AM-band transmitter in our technical library at
www.wenzel.com. Although it may look complicated at first, the circuitry
is easy to make work. Since you are transmitting to an older radio, any
crystal frequency in the band will work. (Newer radios only tune to
specific frequencies.) You shouldn't need a direct connection to your
car's antenna - just a few feet of wire. You may use your tape player's
"mono" mode so that you hear both channels or you may wish to build the
audio mixer to combine both channels and to give a bit of signal gain
(see text). Some earphone outputs require a DC path to ground in order to
work properly (mine did!) so add a several hundred ohm resistor to ground
(whatever works). Please let me know how it works!


From [e-mail] Wed May 29 23:48:09 1996
From: Maurice R Baker <[e-mail]>
Newsgroups: rec.radio.amateur.equipment,rec.radio.swap,rec.radio.amateur.homebrew
Subject: Re: Anyone got a service manual for President Lincoln??
Date: Wed, 29 May 1996 16:51:25 -0300
Message-ID: <[e-mail]>
References: <[e-mail]>
Reply-To: [e-mail]

Erik Finskas OH2LAK wrote:
>
> As the subject tells, I am looking for a service manual for President
> Lincoln.
> If you have one, please mail me. I would be interrested of a copy.
>
> Erik

Perhaps the Walter Reed Army Medical Center or Bethesda Naval Hospital in
Washington, DC could supply one.

Sorry, couldn't resist :-)

WA3ZXO


From [e-mail] Wed May 29 23:48:09 1996
From: [e-mail] (Grover)
Newsgroups: rec.radio.amateur.homebrew
Subject: Basic Electronics Course
Date: 29 May 96 13:16:34 GMT
Message-ID: <[e-mail]>

Looking for a good, inexpensive, course on Basic eltronics.  Anyone taken or
know of one, especially home study type.  Please reply direct
<[e-mail]>.
        72 y Paz ..Grover KQ4AL
QRP WAS = 34
QRO WAS = 49-Hawaii
<[e-mail]>



From [e-mail] Wed May 29 23:48:10 1996
From: [e-mail] (Darrell kimball)
Newsgroups: rec.radio.amateur.homebrew
Subject: Collins flt's
Date: Thu, 23 May 1996 20:07:00 GMT
Message-ID: <[e-mail]>

Anyone know where I can buy Collins mechanical filters? Tnx, N1AOY
[e-mail]


From [e-mail] Wed May 29 23:48:11 1996
From: "William E. Sabin" <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Collins flt's
Date: Fri, 24 May 1996 07:29:18 -0700
Distribution: world
Message-ID: <[e-mail]>
References: <[e-mail]>

Darrell kimball wrote:
>
> Anyone know where I can buy Collins mechanical filters? Tnx, N1AOY
> [e-mail]

Filter Products
2990 Airway Avenue
Costa Mesa CA 92626
Fone 714-641-5311
Fax [phone]
TELEX: 685532 (COLLINS CSMA)

Bill


From [e-mail] Wed May 29 23:48:12 1996
From: Edward Lawrence <eal>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: design for 1/2" catv hardline z matching lines?
Date: 29 May 1996 13:06:29 GMT
Message-ID: <4ohi4l$[e-mail]>
References: <4od01k$[e-mail]> <4ogj3l$[e-mail]> <4oh1ek$[e-mail]>

Ted, you are on the right track, but at 144 Mhz the lengths required get
slightly unreal.
However, get a copy of Jasick and Johnsons "Antenna Engineering Handbook".
Look up coaxial matching sections, in particular the part about two 1/4 wl
marching sections in series, where Hams generally use one.  The basic idea is
rather simple.  Say you are matching from 50 to 100 ohms.  With one 1/4 wl.
transformer, you would use about a 70 Zo line  for the transformer.
With two 1/4 wl. sections, the first would be about 60 ohms, and transform
the 50 ohms to 70 ohms.  The second would be about 83 ohms, and transform the
70 ohms to 100 ohms.  Since this is a total of 1/2 wl.  the whole thing turns
out to be VERY broadband compared to a single section.  You can see that the
extention of this idea leads directly to your tapered line.  This is all from
memory, so go back to the textbook and check it out there.
Cheers!   Ed  WA5SWD



From [e-mail] Wed May 29 23:48:13 1996
From: [e-mail] (Phil Worner)
Newsgroups: rec.radio.amateur.homebrew
Subject: RE: DIPLEXER DESIGN PROGRAM?
Date: 25 May 1996 00:35:47 GMT
Message-ID: <4o5kl3$[e-mail]>

There is a program called Universal Diplexer
in QRP HomeBuilder1.0
ftp ->
ftp.coast.net   /SimTel/win3/hamradio/qrphb1.zip




From [e-mail] Wed May 29 23:48:14 1996
From: Peter Trapp <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Free Beer & Software
Date: 26 May 1996 01:20:27 GMT
Message-ID: <4o8bkr$[e-mail]>
References: <4o29va$[e-mail]> <[e-mail]>

[e-mail] (Jeffrey Herman) wrote:
>In article <4o29va$[e-mail]>,  <[e-mail]> wrote:
>>There's a new software program called "Beers of The World" that's
>>available at http://www.nuos.com/nuos/beer. It seems pretty complete
>>and has descriptions and ratings on over 1500 beers and 500 breweries.
>>Also, everyone who downloads it becomes automatically eligible to win
>>a year of free beer. Check it out.
>
>
>Oh my. Very bad timing to see something like this! Here we've been arguing
>for 3 weeks on .misc in favor of the name for the newly proposed group
>            rec.radio.amateur.boatanchors
>by claiming no one misunderstands the title r.r.a.homebrew, and then
>something like the above has to appear. Phooey.
>
>Let's keep this to ourselves and not let anyone on news.groups know
>about this...       =:o
>
>Jeff KH2PZ

I'm all for beer delivery by radio. Not sure how you would do it
but it sounds like a neat idea ;-)
--
******************************************************************
*      Peter Trapp KD4CN - [e-mail]                   *
******************************************************************




From [e-mail] Wed May 29 23:48:15 1996
Newsgroups: comp.robotics.misc,comp.home.automation,sci.electronics.misc,rec.radio.amateur.homebrew,rec.radio.amateur.misc
From: [e-mail] (Jeffrey Herman)
Subject: Re: Future postings of L.O.S.A ?
Message-ID: <[e-mail]>
References: <[e-mail]> <4o45fb$[e-mail]> <[e-mail]> <4o6b0c$[e-mail]>
Date: Sun, 26 May 1996 03:38:05 GMT

Richard Steven Walz <[e-mail]> wrote:
>In article <[e-mail]>,
>Jeffrey Herman <[e-mail]> wrote:
>>Richard Steven Walz <[e-mail]> wrote:

>>> The BASIC STAMP is a Microchip PIC-based Microcontroller,
>>>and is appropriate for ALL the groups in HIS newsgroup line we keep
>>>seeing! They are used by roboticists, amateur radio enthusiasts, and

>>Not ALL as you say. Are you familiar with the difference between the
>>two groups rec.radio.amateur.misc and r.r.a.homebrew? After you've
>>read the r.r.a charter then you'll understand why this topic and its
>>dozens of followups have no place on r.r.a.misc.

>While some or even many radio amateurs are still in the analog dark
>ages sending postcards to each other, packet radio and other digital
>advances have arrived, and I know of two radio buffs myself, and THEY
>use microcontrollers for their own equipment, so then, what in the
>world do YOU mean by saying that a PIC STAMP list of applications is
>non-relevant to amateur radio??? THEY seem to think it is QUITE
>apropos, and even though I only KNOW these TWO amateurs well enough to
>know, I somehow doubt that THEY wouldn't have a sense for the breadth
>of that endeavor and the attitudes of OTHER folks involved in it!
>So either explain your position now, or else come off of it and admit
>that whoever is SPAMING the L.O.S.A posts is just a backwards
>head-up-the ass son of a bitch technologically, and some kind of
>vacuum loving analog throwback!! ;-) Of course I doubt you will, but
>people telling the honest truth on the Net seems a bit rare anyway,
>and I think you can agree about that!! ;->
>-Steve FUKYU86  (I couldn't resist! )

Steve, Steve, Steve. What are we going to do with you? You obviously
didn't read what I wrote above nor have you read the rec.radio.amatuer
charter yet. When you finally do get arond to reading the charter then
you realize that this topic doesn't belong on r.r.a.misc; it might be
fine for r.r.a.homebrew but not .misc.

Jeff KH2PZ


From [e-mail] Wed May 29 23:48:16 1996
From: [e-mail] (Steve Peters)
Newsgroups: rec.radio.amateur.homebrew
Subject: Help homebrewing a mobile GPS antenna (quadrifilar?)
Date: 28 May 1996 03:15:09 GMT
Message-ID: <[e-mail]>

Thanks for taking a few moments to read this, and maybe to respond...

I am looking to build a homebrew antenna that will function in the band
used to receive GPS signals.  Basically, I have an inexpensive GPS
receiver that I occasionally use in my vehicle.  The vehicle roof and all
the other metal provides a darn good shield, so no signals are rx.

Commercial units are available (for $150!) that purport to receive these
frequencies.  I've seen one , and they're small round, and since I didn't
own it, I couldn't crack it open to take a look see.

So if you have any advice, hints, directions, or references I could look
up, I'd be most appreciative.  You can either post here, or email direct
to [e-mail].

If I get a good response, I'll compile the information neatly, and repost
here, and place it on the WWW.

Thanks and 73s

Steve Peters
N1TYE
Lebanon, NH


From [e-mail] Wed May 29 23:48:17 1996
From: [e-mail] (Ray Anderson)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: help with attenuator
Date: 22 May 1996 03:59:30 GMT
Distribution: world
Message-ID: <4nu3f2$[e-mail]>
References: <[e-mail]>
Reply-To: [e-mail]

In article [e-mail], Scott Macmillan <scott@golfm
ike.demon.co.uk> writes:
>
> Hi all,
> A friend of mine has just bought a Yaesu FT480.  It has an output power
> of 10 Watts and he wants to use it to drive a transverter to operate on
> 6 meters.
> The problem is that the max drive for the transverter is 5 Watts.  He
> will need to put a 3 dB attenuator in the output of the radio to drop
> the power to 5 W.
>
> I have found info on what values of resistors to use to make the
> attenuator, but what I would like to know is would EACH resistor need to
> be able to dissipate 5 Watts of power?
>
> Any help/info to [e-mail]
>
>
> --
> Best 73's
> DE Scott - GM7OMU
> Glasgow, IO75tv.





        Scott-

£££££££££££££££££££££££££££££££££££££££££££££££££££££££££££££££££££££££èë
                                                                         ëë
                     Desired Attenuation = 3.0  dB
CW Power Input = 40.0 dBm                        ëë
System Impedance = 50                      Resistance   Dissipated Pwr   Use (minimum)

     -------+----R2-----+------         R1    292.4       32.3 dBm      4-5 watts
            |           |               R2     17.6       33.8 dBm      5 watts
  in        R1         R3       out     R3    292.4       29.3 dBm      2 watts
            |           |
     -------+-----------+-------

                           ëë
                             ëë


        These are the calculated dissapation values for a 3 dB PI pad
with 10watts (+40dBm) drive. You need to provide a comfortable safety
margin so you don't cook the resistors. Since the input shunt resistor will
dissipate almost 2 watts use a 4 or 5 watt part there. The series
resistor will dissipate almost 2.5 watts so use about a 5 watt part
there. The output shunt resistor will dissipate almost 1 watt so use
ar least a 2 watt part there.


        Hope that helps out.


        73 de WB6TPU

        Ray Anderson

        [e-mail]

               ëë



From [e-mail] Wed May 29 23:48:18 1996
From: Scott Macmillan <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: help with attenuator
Date: Wed, 22 May 1996 01:19:24 +0100
Distribution: world
Message-ID: <[e-mail]>


Hi all,
A friend of mine has just bought a Yaesu FT480.  It has an output power
of 10 Watts and he wants to use it to drive a transverter to operate on
6 meters.
The problem is that the max drive for the transverter is 5 Watts.  He
will need to put a 3 dB attenuator in the output of the radio to drop
the power to 5 W.

I have found info on what values of resistors to use to make the
attenuator, but what I would like to know is would EACH resistor need to
be able to dissipate 5 Watts of power?

Any help/info to [e-mail]


--
Best 73's
DE Scott - GM7OMU
Glasgow, IO75tv.


From [e-mail] Wed May 29 23:48:19 1996
From: Jay Wicklund <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Help With HP-432A Power Meter
Date: Fri, 24 May 96 07:36:27 PDT
Message-ID: <[e-mail]>
References: <4o2rj2$[e-mail]>


In article <4o2rj2$[e-mail]>, <[e-mail]>
writes:

> When it powers up the analog display swings full scale then returns
> below the zero mark. If I remove the bolometer it returns to the
zero
> on the display. Applying power to the head causes no response (-30 -
> 10dbm). I suspect the head is damaged. Is that the way this
instrument
> behaves when the bolometer gets fried ?
>
> PS: Anybody have a good bolometer for sale ? (please don't rip me
off)
>
> Thanks
>
> daveb
Dave, I have a 431, not a 432, but before you leap, do a little more
looking.  First step might be to find someone with a similar unit and
swap cables and heads to see if you can isolate the problem.  Might be
the cable or internal to the 432.

Second, get a manual.  I was able to get a manual for my 431 for about
$20 from Manual Plus in Washington state. [phone].  There are
several other good sources for test equipment manuals, but this is the
one that I've used the most (its close to me).

Jay



From [e-mail] Wed May 29 23:48:20 1996
From: MOTALA SΘbastien <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: HELP-Small VHF for telemetry
Date: Wed, 22 May 1996 11:17:30 +0100
Message-ID: <[e-mail]>

Can someone help me by mailing me some schematics or plans of a small
VHF transmitter ? It is to be used for tracking a small animal.

Frequency :      144 Mhz XTAL controlled
Range :          0.5 - 1 km
Supply :         9-12 VDC

Size and weight should be as low as possible.

I would very much appreciate any help in this matter.
<A HREF="mailto:[e-mail]">mailto:[e-mail]</A>
My thanks to all those who reply !

Sebastien MOTALA.


From [e-mail] Wed May 29 23:48:21 1996
From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: homebrew GPS receiver ?
Date: Wed, 29 May 1996 18:26:57 GMT
Message-ID: <4oi5d0$[e-mail]>
References: <4oeemq$[e-mail]>
Reply-To: [e-mail]

You can buy GPS units below $250 now.  If that is too much, then go the
beacon route and track it with a DF.

It would be nice if someone delivered a brand new GPS via balloon to
me.  Please send it to N 47.03 E 127.32.




From [e-mail] Wed May 29 23:48:22 1996
From: [e-mail] (Ronald Dozier)
Newsgroups: rec.radio.amateur.homebrew,sci.electronics.repair
Subject: Re: How do you weld solder tabs onto NiCd batteries?  How do you solder to stainless tabs?
Date: 28 May 1996 10:16:48 -0400
Message-ID: <4of1sg$[e-mail]>
References: <4oe309$[e-mail]>

In article <4oe309$[e-mail]>,
miker in Tigard, OR. <[e-mail]> wrote:
>
 >I don't have access to a proper welder, so I'd like to "make do".
>
With a proper welder the energy would probably be between 20 and 80
watt-seconds.  Spot welders have a short. med and long timing mode.

>I thought I'd jig up a couple of sharp pointed nails and press them
>against the strap up against the battery.  I'll manually discharge a
>big cap into the nails.  I have no idea how much pressure or how much
>energy will be required.

Use copper.  I would suspect that any other material you woulld weld the
"nail".  I would suggest compressing the tabs between 2 copper rods, 1/8
to 1/16 diameter.  Turn on power elsewhere.

 > >What's wrong with this picture?  Anyone successfully
welded tabs? >Details please.
>
>On a related topic, I also have a bunch of nicads with tabs for
>push-on connectors.   I need to save some space by soldering to the
>tabs.  Of course, they won't solder (now I know why they were cheap),
>probably stainless.

All the Nicads tha I have seen don't readily solder.  The tab is probably
nickel. Gold plating the nickel should allow soldering.
Gold will stick well to nickel.

>




From [e-mail] Wed May 29 23:48:23 1996
From: [e-mail] (miker in Tigard, OR.)
Newsgroups: rec.radio.amateur.homebrew,sci.electronics.repair
Subject: How do you weld solder tabs onto NiCd batteries?  How do you solder to stainless tabs?
Date: Tue, 28 May 1996 05:28:43 GMT
Message-ID: <4oe309$[e-mail]>

I need to weld solder tabs onto a bunch of nicad batteries.
Thought I'd ask before I risk electrocution.

I don't have access to a proper welder, so I'd like to "make do".

I thought I'd jig up a couple of sharp pointed nails and press them
against the strap up against the battery.  I'll manually discharge a
big cap into the nails.  I have no idea how much pressure or how much
energy will be required.

What's wrong with this picture?  Anyone successfully welded tabs?
Details please.

On a related topic, I also have a bunch of nicads with tabs for
push-on connectors.   I need to save some space by soldering to the
tabs.  Of course, they won't solder (now I know why they were cheap),
probably stainless.  Is there a flux for soldering stainless?

Thanks, miker



From [e-mail] Wed May 29 23:48:24 1996
From: [e-mail] (Ed Mitchell)
Newsgroups: rec.radio.amateur.misc,rec.radio.amateur.digital.misc,rec.radio.amateur.policy,rec.radio.amateur.homebrew,rec.radio.amateur.misc
Subject: How was Dayton? Info wanted!!!
Date: 22 May 1996 04:04:43 GMT
Message-ID: <4nu3or$[e-mail]>

If you went to Dayton, could you share your stories with the rest of us. We ar
e
collecting bits and pieces from those you who've gone and putting them togethe
r
for our Ham Radio Online web site. If you saw something of interest, please
pass it along and we will edit into a compendium. Any new equipment?
Interesting tech talks? Digital? ATV? SSTV? Microwave?

We thank you and the zillions of us who didn't make it, will thank you!

73, Ed, KF7VY

--
------------------------
Ed (KF7VY) and Kim (N7VPL) Mitchell
personal email to [e-mail]
Visit Ham Radio Online, it's free! at
http://www.accessone.com/~vbook/hronline.htm



From [e-mail] Wed May 29 23:48:25 1996
From: [e-mail] (Ken Gunton)
Newsgroups: rec.radio.amateur.misc,rec.radio.amateur.digital.misc,rec.radio.amateur.policy,rec.radio.amateur.homebrew,rec.radio.amateur.misc
Subject: Re: How was Dayton? Info wanted!!!
Date: Wed, 22 May 1996 14:27:32 GMT
Message-ID: <[e-mail]>
References: <4nu3or$[e-mail]>
Reply-To: [e-mail]

[e-mail] (Ed Mitchell) wrote:

>>If you went to Dayton, could you share your stories with the rest of us. We
are
>>collecting bits and pieces from those you who've gone and putting them toget
her
>>for our Ham Radio Online web site. If you saw something of interest, please
>>pass it along and we will edit into a compendium. Any new equipment?
>>Interesting tech talks? Digital? ATV? SSTV? Microwave?
>>
>>We thank you and the zillions of us who didn't make it, will thank you!
>>
>>73, Ed, KF7VY
>>
>>--
>>------------------------
>>Ed (KF7VY) and Kim (N7VPL) Mitchell
>>personal email to [e-mail]
>>Visit Ham Radio Online, it's free! at
>>http://www.accessone.com/~vbook/hronline.htm
>>
Microwave at Dayton - definitely on the rise, and I don't mean the DSS
cheater cards, I mean real hardware. For example, one surplus dealer
had pulled an entire set of Narda directional couplers, and was
selling them for only $25.00 each! These were pulled out of almost new
equipment. He had a complete set - 1-2, 2-4, 4-8, 8-18 GHz, and had
10, 20, and 30 dB couplers in each range. These couplers looked brand
new! I sell microwave components for a living, and almost bought the
entire set from him for resale, but didn't because I only sell new
components.

In the old days, we use to speak of 1296 EME with hushed tones, as it
was some sort of black magic and was very expensive to get into. Lots
of experimentation at 10GHz and up these days. Gunnplexers were
selling like hotcakes.

in a nutshell...

Regards,






Ken Gunton WB6QWF TL Distributing - Microwave and RF Components
CAGE Code 01DH7 http://www.erinet.com/kenny/microwave.html


From [e-mail] Wed May 29 23:48:26 1996
Newsgroups: rec.radio.amateur.homebrew
Message-ID: <[e-mail]>
Date: Thu, 23 May 1996 10:41:00 (DST)
Reply-To: [e-mail] (Ej Mars)
From: [e-mail] (Ej Mars)
Subject: Kenwood TS820s


My Kenwood TS820S is Transmitting and receiving off frequency on
upper side band. The If Shift has to be 2-3 notches to the minus side to
recieve Ok. The Lower side band is working find. Does anyone out there
Have any Idea what could be causing this problem and what can I do about
it. Please reply.

Thanks
KCPEPI
[e-mail]



From [e-mail] Wed May 29 23:48:27 1996
From: Dave Maley <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Kenwood TS820s
Date: Sun, 26 May 1996 09:47:50 -0500
Message-ID: <[e-mail]>
References: <[e-mail]>

Ej Mars wrote:
>
> My Kenwood TS820S is Transmitting and receiving off frequency on
> upper side band. The If Shift has to be 2-3 notches to the minus side to
> recieve Ok. The Lower side band is working find. Does anyone out there
> Have any Idea what could be causing this problem and what can I do about
> it. Please reply.
>
> Thanks
> KCPEPI
> [e-mail]
>

Sounds like one of the carrier osc. have gone off frequency.
They are in a module near the VCO.  Best aligned with the use of
a service manual.  Good luck.  Dave.


From [e-mail] Wed May 29 23:48:28 1996
Newsgroups: rec.radio.amateur.homebrew
From: [e-mail] (Jeffrey Herman)
Subject: Key belonging to owner of Vibroplex Co. stolen at Dayton
Message-ID: <[e-mail]>
Date: Thu, 23 May 1996 22:25:15 GMT

Mitch, WA4OSR, owner of Vibroplex Company, gave me permission to post the
following. Let's please get his bug returned to him.

Jeff KH2PZ

===========================================================================
From: Mitch, WA4OSR <[e-mail]>

stolen at dayton from the vibroplex booth, an elaborately engraved vibroplex
square brass racer, serial number 101000, with 'Mitch"
engraved on the top of the vertical block... the key is gold plated, and is
obviously very unique... anyone who has any information about
the key please contact me at the address below... no questions asked... i
just want my key back...
mitch
wa4osr
------------- * * * The oldest company in ham radio! * * *------------------
Felton "Mitch" Mitchell                              The Vibroplex Co., Inc.
[e-mail]                                          11 Midtown Park, E.
334-478-8873, FAX [phone]                         Mobile, AL 36606-4141


From [e-mail] Wed May 29 23:48:29 1996
From: RJD <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Key belonging to owner of Vibroplex Co. stolen at Dayton
Date: Mon, 27 May 1996 21:46:38 -0400
Message-ID: <[e-mail]>
References: <[e-mail]>

Jeffrey Herman wrote:
>
> Mitch, WA4OSR, owner of Vibroplex Company, gave me permission to post the
> following. Let's please get his bug returned to him.
>
> Jeff KH2PZ
>
> ===========================================================================
> From: Mitch, WA4OSR <[e-mail]>
>
> stolen at dayton from the vibroplex booth, an elaborately engraved vibroplex
> square brass racer, serial number 101000, with 'Mitch"
> engraved on the top of the vertical block... the key is gold plated, and is
> obviously very unique... anyone who has any information about
> the key please contact me at the address below... no questions asked... i
> just want my key back...
> mitch
> wa4osr
> ------------- * * * The oldest company in ham radio! * * *------------------
> Felton "Mitch" Mitchell                              The Vibroplex Co., Inc.
> [e-mail]                                          11 Midtown Park, E.
> 334-478-8873, FAX [phone]                         Mobile, AL 36606-4141

Unbelievable!.  Or, I guess, believable.  Sad.

Hope you do locate the key.

73s
WB2JGH


From [e-mail] Wed May 29 23:48:29 1996
From: [e-mail](Brian J Mork)
Newsgroups: rec.radio.amateur.homebrew
Subject: KPC-3 microprocessor info?
Date: 27 May 1996 05:19:56 GMT
Message-ID: <4obe1s$[e-mail]>

   Does anybody have availability/pricing info for the
6303 microprocessor inside a KPC-3?  I fried mine with
static and need a replacement.

/Brian



From [e-mail] Wed May 29 23:48:30 1996
Newsgroups: rec.radio.amateur.homebrew
From: [e-mail] (MAC)
Subject: Looking for 6mtrs circuit diagram!!!!!!!!
Message-ID: <[e-mail]>
Distribution: Worldwide
Date: Wed, 22 May 1996 18:35:13 GMT

Hi ,
   I wonder if any body would have a circuit diagram or know the where abouts
of one for a 6mtrs Transverter.Maybe somebody could recommend a kit of some
sort otherwise but I would grateful for the info.....

  Regards Robbie EI8ESB


From [e-mail] Wed May 29 23:48:31 1996
From: Woody White <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Looking for 6mtrs circuit diagram!!!!!!!!
Date: 25 May 1996 00:51:24 GMT
Message-ID: <4o5lic$[e-mail]>
References: <[e-mail]> <4o2vg0$[e-mail]>

[e-mail] (Jeff Duntemann) wrote:
>[e-mail] (MAC) wrote:
>
>>Hi ,
>>   I wonder if any body would have a circuit diagram or know the where about
s
>>of one for a 6mtrs Transverter.Maybe somebody could recommend a kit of some
>>sort otherwise but I would grateful for the info.....
>
>>  Regards Robbie EI8ESB
>
>For the last several years the ARRL Handbook has published a 6m
>transmitting converter, which uses an MRF476 final and puts out 3-4
>watts on 6M.
>
>If you're fairly new to homebrewing, you might want to try TenTec's
>kit instead.  I don't know much about it; others here might offer
>their opinions.
>
>--73--
>
>--Jeff Duntemann KG7JF
>  Scottsdale, Arizona
>
>
More information about the Ten-Tec kit should you need it.
Model: T-Kit # 1208 from Ten-Tec, Sevierville, TN, USA
It was reviewed in the June issue of the ARRL journal QST. Price was noted at
$95 US
Woody WB4QXE 73



From [e-mail] Wed May 29 23:48:32 1996
From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew,rec.radio.amateur.equipment
Subject: Re: Looking for SRF2926 Transistor
Date: 29 May 1996 05:38:56 GMT
Message-ID: <4ogntg$[e-mail]>
References: <4od7hf$[e-mail]>

In article <4od7hf$[e-mail]>,
[e-mail] says...
>
>I'm trying to locate a SRF2926 transistor to repair
the PA in a UHF repeater.
>I can't find them listed in any of my catalogs (which
are not extensive).
>Anyone know of a source or replacement for them?
Anyone have any spares laying
>around? It's a late 70's vintage Aerotron unit, if
that helps.
>
>Thanks & 73...    Mark    AA7TA


What you've got is a Motorola transistor that was a
"special". SRF's usually have a standard counterpart
(such as an MRF455 in the case of an HF power
transistor) but were house-marked for a particular
company's application due to a special requirement.
They may be graded for a certain beta range or, more
likely in your case, for having more tightly controlled
UHF parameters than a standard MRF part would have from
any given lot.

Sometimes, companies have parts specially marked just
to discourage copycats. The silly part is that
these special parts often have the Motorola "bug"
printed right on the top (although Motorola probably
won't release the actual cross reference information
for one of their customer's source control drawings).
WHat you might do is get hold of an old Motorola RF
Devices handbook and just do some detective work.

You probably know the output power and frequency range
of the device; you know or can measure the Vcc (and
double it to put you in the ballpark of the proper Vcex
ratings for a Class-C UHF power amp). THe case type is
obtainable by simple observation and comparison to
what's in the catalog.With this info, you can generally
cross-reference the device to a standard part with a
minimum amount of trouble and with a high degree of
certainty.

Hope this helps!

73's

Geoff  NQ7A



From [e-mail] Wed May 29 23:48:33 1996
From: [e-mail] (KOMATSU Toshiki)
Newsgroups: rec.radio.amateur.digital.misc,rec.radio.amateur.homebrew
Subject: looking for TFWIN.DLL
Date: Mon, 27 May 1996 10:56:17 +0900
Message-ID: <[e-mail]>
Reply-To: [e-mail]

   Hello OMs,

   I am looking for TFWIN.DLL. This is host mode packet driver for Windows 95.
   My neighbour is running WinFBB PBBS with BayCom modem, its documents
remind this library, but we cannot locate where it is.

   Any informations are welcome.

--
KOMATSU Toshiki / Joint Graduate school of Chem., Univ. of Tsukuba
[e-mail], [e-mail]


From [e-mail] Wed May 29 23:48:34 1996
From: Spencer Petri <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: McCoy Electronics Filter info needed!
Date: 25 May 1996 06:01:54 GMT
Message-ID: <4o67oi$[e-mail]>

Need any vital info on this filter.  FSN 293-7321-030.  P/N  2B523.  The
Fc is 11096 Khz. Thats all I know about it.  Please E-mail direct.
Thanks.

73 de Pete  WA5JCI



From [e-mail] Wed May 29 23:48:35 1996
From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Need 2W Carbon Resistors
Date: 27 May 1996 18:51:07 GMT
Message-ID: <4octir$[e-mail]>
References: <[e-mail]> <4oahpb$[e-mail]>
Reply-To: [e-mail]

In <4oahpb$[e-mail]>, [e-mail] (DaveArea51) writes:
>Try Surplus Sales of Nebraska.  I'd be very surprised if they couldn't
>help you.


Try Pembleton Electronics in Fort Wayne Indiana. They have thousands at 'real'
surplus prices. Also, start making your plans for the Fort Wayne Hamfest on
November 16-17. The best Hamfest deal in the country. Check out their Web Page
.
at - http://pwp.usa.pipeline.com/~dagagnon/
It isn't Dayton but 1100 tables, 152,000 square feet of indoor space, an atten
dance
of 7,000 last year for a $5.00 admission for 2 days isn't too shabby! See you
there!

                                              Jim WD9AHF


From [e-mail] Wed May 29 23:48:36 1996
From: [e-mail] (DH)
Newsgroups: rec.radio.amateur.homebrew
Subject: NEED CROSSBAND REPEATER PLANS
Date: Sun, 26 May 1996 19:20:49 GMT
Message-ID: <4oab1n$[e-mail]>

Hello,
  I need some type of plans to build a cross band repeater between two
different mobile radios.  I would like to incooporate some type of
ID'er also.  Please email with your help and comments.

Thanks es 73's
[e-mail]




From [e-mail] Wed May 29 23:48:37 1996
From: [e-mail] (Chris Elmquist)
Newsgroups: rec.radio.amateur.equipment,rec.radio.amateur.homebrew,sci.electronics
Subject: Need schematic for HP6220B power supply
Date: 24 May 1996 09:37:56 -0500
Message-ID: <4o4hk4$[e-mail]>

Looking for the schematic (or even better the manual) for an HP6220B
DC power supply.  It's a 0-50V, .5A / 0-25V, 1A bench top supply.
It was a "good deal" at Dayton...  it makes output, which is adjustable,
however the metering circuit is bonkers.  The meter swings wildly from
the negative peg to the positive peg in both voltage or current modes.

I'll reimburse for any duplicating/mailing costs.

Thanks.

Chris
--
Chris Elmquist, N0JCF
[e-mail]
[e-mail]


From [e-mail] Wed May 29 23:48:38 1996
From: George Harris <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Palomar HF Tube Amp Quest
Date: 22 May 1996 13:45:48 GMT
Message-ID: <4nv5qc$7al$[e-mail]>
References: <[e-mail]>

Hi KD8NV,
Thanks for your response, but i have already gotten all the
information that I needed. Again thanks for your response.
Have a good Day!

73
George

--
Don't do anything that I wouldn't, At least don't get CAUGHT!!!!


From [e-mail] Wed May 29 23:48:40 1996
From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Saturation in toroid cores
Date: 27 May 1996 18:57:49 GMT
Message-ID: <4octvd$[e-mail]>
References: <4nc17k$[e-mail]> <4nde65$[e-mail]> <4nekln$[e-mail]> <4nu20t$[e-mail]> <4nvb8q$[e-mail]> <4o2pkq$[e-mail]> <4obh1t$[e-mail]>

Wilbert Knol ([e-mail]) wrote:
: Kevin Schmidt <kschmidt> wrote:
: >Just to show there is no magic here, Faraday's law in SI is
: >   Curl E = -dB/dt.
: >For a single frequency f this says
: >|Vpeak(Volts)| N = |Bpeak(Tesla)| 2 pi f(Hz) Area(meter^2)

: Am I correct in assuming |Vpeak| is in fact the voltage induced by the
: B field?

: It appears to me that the voltage applied would have to be slightly
: larger than the opposing (self) induced voltage, this in order to
: generate the current responsible for the H field.

: Wilbert, ZL2BSJ.

First let me slightly  correct the formula; the N should be
on the opposite side of the equal sign. N*A gives the total area
enclosed by the N turns,
|Vpeak(Volts)| = N |Bpeak(Tesla)| 2 pi f(Hz) Area(meter^2).
The rest was correct.

V_peak is the voltage measured across the N turns. If the N turns are
left open, they don't contribute to the the magnetic field since no
current flows. You then measure the voltage induced by the magnetic
field from whatever other turns there are.  If you apply a different
voltage to the N turn winding, a current will flow in it. This will
produce the additional magnetic field exactly needed so that faraday's
law holds. That is there is some (self) inductance in the winding and
current through the winding itself will produce an additional voltage
across the winding. For example if you short a turn, the net flux
through the shorted turn must be zero (ignoring the fact that it is not
a perfect conductor). If other windings on the toroid produce a
magnetic field, then a current flows in the shorted turn to produce an
additional field that cancels the field from the other windings through
the shorted turn.

You can calculate the flux from the currents in the windings too,
but it is a little harder. The other Curl equation
in Maxwell's equations (in SI) says,
   Curl H = dD/dt + J.
For normal toroids, the dD/dt term can be ignored, and this reduces
to Ampere's law
   Curl H = J.
Converting into the integral form, I get (approximately) for a single winding
H 2 pi r = N I.
or with B = mu H
B = mu N I /(2 pi r)
where 2 pi r is the circumference of the loop around the toroid where
you are calculating the magnetic field (it really isn't constant
across the area of the cross section of the toroid).  You can now
measure all the currents in all the windings complete with their phases
and calculate the flux from each of the windings.  You need to know the
mu of the core too.  You then add all these fluxes up to get the
total flux in the core.

The answer you get will agree with that of Faraday's law.  Most people
find it a lot easier to just measure the voltage across one winding.

Kevin [e-mail]





From [e-mail] Wed May 29 23:48:41 1996
From: Brian Oblivion <[e-mail]>
Newsgroups: alt.ham-radio.vhf-uhf,rec.radio.amateur.equipment,rec.radio.amateur.homebrew,rec.radio.swap
Subject: Schematics/Parts list for Ramsey 2 Meter Kit?
Date: Sat, 25 May 1996 16:47:20 -0500
Message-ID: <[e-mail]>

Greetings,

Has anyone built the Ramsey 2 Meter Kit and still have the Schematics/
Parts List still around?  I just picked one up at a Hamfest for dirt
cheap so it's worth it for me to try and repair it.  One component is
fried beyond recognition, hence my need for the schematic/list.

I'd really like to fix this rig.  The exact part number of this rig is
either RK-FX146 or RK-FX220.  I'm sure the cicuitry is close enough
for either part number.

Thanks.

Brian
[e-mail]


From [e-mail] Wed May 29 23:48:41 1996
From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: Trifilar windings?
Date: 24 May 96 22:46:19 GMT
Message-ID: <[e-mail]>

I have been doing a lot of reading lately and many transformers
including DBM transformers specify trifilar windings.  Why is this?

Is it just easier to do the windings?  It sure doesn't seem so to me.
I can't believe that the coupling is really that much tighter when
trifilar windings are used.  It would seem that the toroid properties
give most of the coupling.  But I've been wrong before once or twice.

Ray Mack
WD5IFS
[e-mail]
Friendswood (Houston), TX



From [e-mail] Wed May 29 23:48:42 1996
From: [e-mail] (Kevin  AstirCS "1U"   KO0B)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Wanted: RS232 to TTL
Date: Fri, 24 May 1996 11:31:19 -0700 (PDT)
Message-ID: <4o4rmk$[e-mail]>
References: <[e-mail]> <[e-mail]> <4m3ilp$[e-mail]>


>The MAX232 is way to go...
>Everything in 1 package plus 5 Caps. ..  KISS Keep it simple Stu

Caveat:  These switched capacitor charge pump circuits require some
care in shielding, PS filtering.  They can generate a fair amount of
RF hash.

-KF-




From [e-mail] Wed May 29 23:48:43 1996
From: Bob Winingham <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Wanted: RS232 to TTL
Date: 25 May 1996 06:03:43 GMT
Message-ID: <4o67rv$[e-mail]>
References: <[e-mail]> <[e-mail]> <4m3ilp$[e-mail]> <4o4rmk$[e-mail]>
To: [e-mail]

>care in shielding, PS filtering.  They can generate a fair amount of
>RF hash.


I think it is the MAX233 (or the DS clone) that has the  built in Caps
for the pump abd does not need the external ones.


From [e-mail] Wed May 29 23:48:44 1996
From: Dave <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Wanted: RS232 to TTL
Date: 28 May 1996 17:59:55 GMT
Message-ID: <4ofeur$[e-mail]>
References: <[e-mail]> <[e-mail]> <4m3ilp$[e-mail]> <4o4rmk$[e-mail]>

here's a simple way to convert RS232 to TTL


                         | +5
                        _|_
                        /_\
                         |
rs232 ->  ----[3.3k]-----*--- TTL
                         |
                         |
                        _|_
                        /_\
                         |
                         |
                         GND

Incase the schematic didn't come out.
bring the RS232 in through a 3.3k resistor conectted to a diode
clamp to +5 and ground



From [e-mail] Mon Jun 03 17:25:21 1996
From: Peter Markham
Newsgroups: rec.radio.amateur.homebrew
Subject: Source 2 3/8" to 2 1/2" solid fg stock?
Date: 27 May 1996 12:37:44 -0700
Message-ID: <4od0a8$[e-mail]>


  I am still looking for a source of 2 3/8" to 2 1/2" solid
fiberglass rod stock, and engineering specs for the material.
I intend to erect a Rohn HDBX, using the stock to isolate the
tower. Any objective criticism or help, welcome.

                                 TIA,
                                     Pete/wa4hei


From [e-mail] Mon Jun 03 17:25:21 1996
Newsgroups: rec.radio.amateur.homebrew
From: [e-mail]
Subject: Re: mods for FT-2500M
Message-ID: <[e-mail]>
References: <4obr6e$[e-mail]>
Date: Tue, 28 May 1996 08:35:31 GMT

[e-mail] (Radio2talk) wrote:

>I am looking for any and all mods for the Yeasu FT-2500M.
>Ones to extend receive would especiallly help


>TNX
>Martin N9ZTZ



>e-mail at [e-mail]
I have a ft-2500 there is a little yellow wire under the top cover (i
believe it is yellow anyway) all i did was clip it and that unlocks
the vco therefore you should have both extended recieve and transmit.
if this yellow wire is not obvious to you just e-mail me for more
info. [e-mail]   kb9loa




From [e-mail] Mon Jun 03 17:25:22 1996
From: "Thomas L. Gaines, Sr." <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: PLATE METER FOR SB220
Date: Tue, 28 May 1996 14:38:40 -0700
Message-ID: <[e-mail]>

I need a plate meter for the SB220 amplifier..Anyone having one or a
source, please reply.

Tnx, Tom
--
Thomas L. Gaines, Sr.
Amateur Radio Callsign  N5ISE
703 Jones Street
Picayune, MS  39466-5239
Coordinates  30*31' North  89*42'West


From [e-mail] Mon Jun 03 17:25:23 1996
From: [e-mail] (Steven Whitehead)
Newsgroups: rec.radio.amateur.homebrew
Subject: Here is how to solder Nicads without tabs
Date: Tue, 28 May 1996 23:42:11
Message-ID: <[e-mail]>

Mike in Oregon wanted to know how to solder on nicads that did not have
a solder tab.  Here is how.

Go to the plumbing supply store and get some solder paste.
The stuff I use is like a light grease.  It is acid so treat is like
what it is.  If you get some on your hands and scratch you'll
find out why....
It is the acid used in acid core solder.  I know you aren't supposed
to use it in electronics but you gotta do what you gotta do.

Dip the end of your rosin core solder into the paste and solder away.
The fumes are nasty, don't breathe them.  This works good on
corroded wires.  Clean the tip of your iron on a seperate cloth so
you don't contaminate your sponge.  You want to get the acid off
the tip as soon as you are done as it will eat away the tip.

I've been doing this for years and it works great.

Steve


From [e-mail] Mon Jun 03 17:25:24 1996
From: [e-mail](Anthony Severdia)
Newsgroups: rec.radio.amateur.antenna,rec.radio.amateur.homebrew
Subject: Re: need help with wire dipole
Date: 29 May 1996 00:58:36 GMT
Message-ID: <4og7fs$[e-mail]>
References: <[e-mail]>

In <[e-mail]>
[e-mail] (Charlie Fortner) writes:
>
>I'm planning to put up a 250 ft (approx. full wave 80m) wire dipole
and
>feed it with ladder line for use as a multiband antenna.  If the legs
are
>more than 90 degrees apart in the horizontal and veritical planes,
will
>the radiation pattern be substantially different that if it was 180
>degrees in each plane?  Any other suggestions appreciated.  Thanks.
>
>73 de KF4GJQ (Charlie Fortner)

    Charlie, you don't say how high at the apex!  This makes a
considerable difference too.  Yes, the radiation pattern will be
different at the fundamental freq and very different at the harmonics
but if you put up such "long one" don't worry about it ...just use it
and make your observations!  Good luck

    -=Tony=-



From [e-mail] Mon Jun 03 17:25:25 1996
From: Michael Abbott <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: design for 1/2" catv hardline z matching lines?
Date: 29 May 1996 04:16:53 GMT
Message-ID: <4ogj3l$[e-mail]>
References: <4od01k$[e-mail]>

You'll be miles ahead if you could use the 3/4 inch CATV hardline.  If you dec
ide to
use it, let me know and I'll get the matching transformer info to you.



From [e-mail] Mon Jun 03 17:25:26 1996
From: [e-mail](Ted Viens )
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: design for 1/2" catv hardline z matching lines?
Date: 29 May 1996 08:21:40 GMT
Message-ID: <4oh1ek$[e-mail]>
References: <4od01k$[e-mail]> <4ogj3l$[e-mail]>

In <4ogj3l$[e-mail]> Michael Abbott
<[e-mail]> writes:
>
>You'll be miles ahead if you could use the 3/4 inch CATV hardline.  If
you decide to
>use it, let me know and I'll get the matching transformer info to you.
>
I hate to post when I am unsure of my understanding of these things.
But still, Can't tapered coax sections be used to match most any
impedance to any other impedance over a modestly broad bandwidth?  What
I envision is something that would be say over 10 diameters long,
possibly less than 1/10th wavelength.  What I have considered doing
when I get a round tuit is taking a length of the smaller center
conductor and wrapping it with a skinny triangle of metal foil to
create a taper to the larger center conductor.  Over this, I would
squeeze a length of the larger dielectric molded to the shield taper.
Then I would form the larger shield to fit the taper.

Am I just blowing smoke or could this be a workable way to fabricate
coaxial matching sections???
--
Bye...  Ted..
Deep in the Heart of the Armpits of Houston, Texas...


From [e-mail] Mon Jun 03 17:25:27 1996
From: Tony Wallace <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Want Source fo AD7008 DDS chips
Date: Wed, 29 May 1996 09:58:00 -0400
Message-ID: <[e-mail]>
References: <[e-mail]> <4o7o0u$[e-mail]> <4od6gi$[e-mail]> <[e-mail]>

I too would go for 3 to 5 @ these prices!

Tony Wallace, [e-mail]
              [e-mail]


On Tue, 28 May 1996, Ed Ganger wrote:

> In article <4od6gi$[e-mail]> [e-mail] (TIEM
ANN BRUCE) writes:
> >How many is "small production quantities?"  Any chance a r.r.a.h. group ord
er
> >for AD7008s could be placed?  For $7 each, I'd get several.  Or is there a
>                                 ^^^^^^^^^^^^^^^^^^^^^^^^
>
> Count me in on any "group buy" ... I would be good for 3-5 at that price.
> Regards,
> Ed KB4ORA
>
>


From [e-mail] Mon Jun 03 17:25:28 1996
From: Erik Finskas OH2LAK <[e-mail]>
Newsgroups: rec.radio.amateur.equipment,rec.radio.swap,rec.radio.amateur.homebrew
Subject: Anyone got a service manual for President Lincoln??
Date: Wed, 29 May 1996 15:26:55 +0100
Message-ID: <[e-mail]>

As the subject tells, I am looking for a service manual for President
Lincoln.
If you have one, please mail me. I would be interrested of a copy.

Erik
--
Erik Finskas M1AAJ & OH2LAK
Email [e-mail]
      [e-mail]
University of Portsmouth, UK
Department of Electric and Electronic Engineering


From [e-mail] Mon Jun 03 17:25:28 1996
From: [e-mail] (Kevin  AstirCS "1U"   KO0B)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Anti-freeze in CanTenna???
Date: Wed, 29 May 1996 15:52:42 -0700 (PDT)
Message-ID: <4oigt8$[e-mail]>
References: <4m7pf0$[e-mail]> <4m8iib$[e-mail]>


A  timely topic.

I just helped my mom clean out her house ready to sell, and FINALLY
found my old Cantenna.

I vaugely remember buying the oil at some ham store in Denver, but
have no idea what it was.  I remember they had it bulk, in a 55 gal
drum, and I had to bring a jug to take it home in.

Does anyone know a cheap simple test  for PCBs, or,  failing that,
know  exact year when the stuff was banned?

Guess I'll post to a chemestry group as well.

Thanks for any help,
73, Kevin



From [e-mail] Mon Jun 03 17:25:29 1996
From: Greg Lohstroh <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: old morse code key source
Date: Wed, 29 May 1996 17:34:02 -0400
Message-ID: <[e-mail]>
References: <[e-mail]>

Tucker electronics 1-800-559-7388


On Wed, 29 May 1996, Rooster wrote:

> does anyone have a source of good or better quality morse code keys?
> the old ones that went up and down, all mechanical, sometimes made of
> brass?
>=20
> thanks in advance.
> ---
>  =FE OLX 2.1 TD =FE no good deed goes unpunished
>                                         =20
> --=20
> rooster
>=20
>=20
>=20


From [e-mail] Mon Jun 03 17:25:30 1996
From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Class-C RF transistors ?
Date: Wed, 29 May 1996 20:49:10 GMT
Message-ID: <4oidd2$[e-mail]>
References: <[e-mail]>

[e-mail] (Hugh Duff) wrote:



>I've always wondered what makes an RF transistor a "Class-C" device
>versus linear ? I always thought that it was the external biasing that
>places a transistor in a different mode of operation yet some
>transistors in the databooks are spec'ed for Class-C operation.
>I suspect it has to do with the die-fab. What would happen if one of
>these transistors was biased class AB for SSB use ?


>Thanks...
>Hugh Duff  VA3TO  Toronto


>---
> ■ NFX v1.3 [000]


I don't know the theory, but I have been using the Class-C rated 175
MHz   2N5641 in homebrew gear for ten years on HF, 6M, and 2M, biased
for A or AB on SSB, with excellent results.

Why?  I got used to them in my old Signal/One CX7 (1969), where they
are used that way, and I had spares on hand.

The 5642 and 5643 have higher power ratings and probably will also do
well.  MOT carried them for years; if they are out now, Richardson
might have still  them.




73,

Mark, KN5S    DM62

--

Mark Mandelkern
Las Cruces, New Mexico, USA

[e-mail]



From [e-mail] Mon Jun 03 17:25:31 1996
From: Woody White <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Here is how to solder Nicads without tabs
Date: 30 May 1996 02:32:39 GMT
Message-ID: <4oj1c7$[e-mail]>
References: <[e-mail]>
To: I,agree,with,Steven


I agree with Steven but have an added "twist".  I use the aggressive paste too
, but
apply it to the battery, then lightly sand with fine emery cloth. This will he
lp
break up the oxide passivation layer and help prevent reformation before you c
an get
the iron on it.  Use a hot iron and work fast to avoid heating the cell.
Woody



From [e-mail] Mon Jun 03 17:25:33 1996
From: [e-mail] (HH357)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: homebrew GPS receiver ? on a balloon
Date: 30 May 1996 04:50:44 -0400
Message-ID: <4ojnh4$[e-mail]>
References: <4oeemq$[e-mail]>
Reply-To: [e-mail] (HH357)

GPS units also have a maximum altitude (so it cant be used in a missle).
I used to send up 5-6 ft. weather ballons for the forest service, and as I
recall, we got up to 20,000 ft in a half hour or so.  So your commercial
GPS unit would be of no use after 30 min at most.
GPS's also have a maximum acceleration limit, if I'm not mistaken,  but I
doubt if any balloon will ever reach that limit.
                                           Good luck
                                                H Higgins


From [e-mail] Mon Jun 03 17:25:34 1996
From: Francis Lyn <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Help! 70MHz Amplifier???
Date: 30 May 1996 12:03:21 GMT
Message-ID: <4ok2q9$[e-mail]>
References: <[e-mail]>

Build your own PA stage. Motorola makes RF MOSFETS that will do the job,
and provide lots of application notes for high power broad band VHF
amplifiers using MOSFETS. With 30 W drive, a push-pull output stage is
probably all you need.

The hard part in designing RF power amplifiers is to get the input and
output impedance matching networks right. Since you want to drive a 5 k
load, you should design the output matching network for a Zl = 5k instead
of the usual 50 ohm. No reason to use a step up transformer, that is what
the matching network is supposed to do (along with harmonic suppression,
which may not matter in your application).

Call on some of your friend in Electrical Engineering; they should be
glad to assist. Good Luck!


Francis - VE3TDL





From [e-mail] Mon Jun 03 17:25:34 1996
From: "Barry L. Eure" <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Basic Electronics Course
Date: Thu, 30 May 1996 12:14:31 -0700
Message-ID: <[e-mail]>
References: <[e-mail]>

Grover wrote:
>
> Looking for a good, inexpensive, course on Basic eltronics.  Anyone taken or
> know of one, especially home study type.  Please reply direct
> <[e-mail]>.
>         72 y Paz ..Grover KQ4AL
> QRP WAS = 34
> QRO WAS = 49-Hawaii
> <[e-mail]>

There is a very good book out authored by Stan Gibilisco and published by
McGraw-Hill's TAB BOOKS division titled "Teach Yourself Electricity and
Electronics"

72
Barry




From [e-mail] Mon Jun 03 17:25:36 1996
From: [e-mail] (Richard Steven Walz)
Newsgroups: comp.robotics.misc,comp.home.automation,sci.electronics.misc,rec.radio.amateur.homebrew,rec.radio.amateur.misc
Subject: Re: Future postings of L.O.S.A ?
Date: 30 May 1996 13:23:33 GMT
Message-ID: <4ok7gl$[e-mail]>
References: <[e-mail]> <4o2lug$[e-mail]> <4o45fb$[e-mail]> <4oje7k$[e-mail]>

In article <4oje7k$[e-mail]>,
Bob Wilkins ~ n6fri <[e-mail]> wrote:
>Richard Steven Walz ([e-mail]) wrote:
>: P.S. L.O.S.A. is a mail list for stamp application technical notes,
>: and it is considered quite kosher to post in this neighborhood of the
>: UseNet.
>
>While most folks use a damp sponge to apply stamps, it might be more
--------------------------------------------
The Parallax BASIC Stamp is a microcontroller, you insipid Loser!
The L.O.S.A is the mailing list for their applications. It is posted
to electronics related groups once in a while. It is a Mailing List,
as in it HAS No ftp site or web site. It needs to be posted
periodically as does places where to find FAQ files need to be
posted!
-Steve

>kosher to just have a pointer to your ftp sites or learn the html code
>and put up a web page. Try to send your foul language to the hams to
>e-mail, or better yet put it in an audio file on your web server.
>In this neighborhood there are those who want to lick stamps...
>--
>       Bob Wilkins                   home    [e-mail]
> Berkeley Hills, California          work    [e-mail]
>         CM87uv                      play    n6fri@n0ary.#nocal.ca.usa.noam
--------------------------------------------------
It was you clowns who started trolling over here on sci.electronics.*
looking for trouble! These *GROUPS* don't post the LOSA notices! Get
your damned attribution skills honed a little better! If you want to
come looking for trouble, I'll tell you to go fuck yourself, and lick
your ass while you're at the stamps, eh! If you don't know these
words, look 'em up. They're in the OED!!
-Steve Walz   [e-mail]
P.S., I don't know why these whiners come here looking for trouble with
their X-Posting line identical to the Newsgroup: line! I just delete
'em! Serves them right! He wasn't from around here! If you lot want to
see nastiness, let that idiot live. If not, email your crap to him,
not me. Mine now goes to the Justice Department if you've been warned
before, and you'll be barred from further email to me if you TRY to take
this public issue to private email!! Respond in the public light of
day, or keep your mouth shut! Cheezeball anon-remailers have been
blocked.
-Steve
--
-Steve Walz  [e-mail]  ftp://ftp.armory.com/pub/user/rstevew
mirrored: ftp://ieee.cas.uc.edu/pub/electronics/faqs/ftp.armory.com
and Europe: ftp://ftp.cised.unina.it/pub/electronics/ftp.armory.com
and Oz: ftp://ftp.peninsula.apana.org.au/pub/electronics/ftp.armory.com


From [e-mail] Mon Jun 03 17:25:38 1996
From: [e-mail] (Hugues Caron)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: ARRL synch. detector
Date: Thu, 30 May 1996 17:44:55 GMT
Message-ID: <4ol8hm$[e-mail]>
References: <4nih5k$[e-mail]> <[e-mail]> <[e-mail]>
Reply-To: [e-mail]

Jake Brodsky <[e-mail]> wrote:

Thanks, Jake, for your reply and comments and tanks also to the many
others that brought their help, some directly through e-mail. The
support of one of them I have in mind, has been realy FANTASTIC.

I have started the construction though I'm still waiting for some of
the parts.

>I built one with some freinds.  We put it in an FRG-100 and it worked
>pretty well after we tweaked some of the parts a bit.

Could you expand a bit on what you mean  by 'tweaked'.

> I don't think the original article had the part values all that close.  But
it doesn't
>matter.  Just get an assortment of parts that are reasonably close.

I've ordered the 1%  resistors as well as the C0G caps (NPO!!;  Should
have taken a closer look to the components chapter of the h'book
before posting this question.  (: <  . Thanks for the previous poster
reply in any case)

>If your varactor capacitance ranges are wide enough, you can make up
>for pretty much any other drift you might encounter.

Are you aware if  NTE613 tuning diodes (~22pf at 4 V) could serve as
direct replacement to BB809 or  BB409    ( ~ 33pf at 2 V)  suggested
by the author. I have the MV2109 and MV2105  ( thanks to my FANTASTIC
contact) to be paralleled  in replacement of any of the BBs, but would
prefer 2 parts instead of 4 due to space constrains I have to deal
with.

I'm pretty shure these parts are availlable in Montreal.

Again thanks to all,

H. Caron

>Jake Brodsky, AB3A




>"Beware of the massive impossible!"




From [e-mail] Mon Jun 03 17:25:39 1996
Newsgroups: rec.radio.amateur.homebrew
From: [e-mail]
Subject: Re: Expirimental Microwave Transmissions
Message-ID: <[e-mail]>
References: <4oi13i$[e-mail]>
Date: Thu, 30 May 1996 18:00:33 GMT

In article <4oi13i$[e-mail]>,
MIKE STEWART <[e-mail]> wrote:
> A co-worker and I are working on using the magnatron from a microwave to
> transmit back and forth to each other. but we've run into a problem when it
> comes to modulating the magnatron. ...

I am told there was an article on this years ago in '73' magazine but
I haven't found any library with back holdings this side of Amherst,
so I haven't pursued it.


73,
Bill Ricker  N1VUX  [e-mail]  "The freedom of the press belongs
http://world.std.com/~wdr               to those who own one."--A.J.Liebling
[e-mail] (temporary?)    [e-mail]
--
Bill Ricker  N1VUX  [e-mail]  "The freedom of the press belongs
http://world.std.com/~wdr               to those who own one."--A.J.Liebling


From [e-mail] Mon Jun 03 17:25:40 1996
From: [e-mail] (D.W.Hemphill KC5NG)
Newsgroups: rec.radio.amateur.homebrew,REC.RADIO.AMATEUR.EQUIPMENT
Subject: Re: WTB, receive xtal for Kenwood TH-21AT
Date: 30 May 1996 18:01:34 GMT
Message-ID: <4oknpu$[e-mail]>
References: <4oe9fq$[e-mail]>

In article <4oe9fq$[e-mail]>, [e-mail] says...
>
>I need a receive crystal for a Kenwood TH21-AT handheld.
>It's 61.84964  MHz or thereabouts. Designated X2.
>thanks, miker
>

Mike,

Have you called East Coast Transistor?  They're the official parts
outlet for Kenwood.  How about calling JAN Crystal, International,
or some other crystal maker?  I'd estimate you could get one for
about $10 from most makers, maybe a bit more for the Kenwood part.

BTW... if you decide the TH-21AT isn't worth fixing, I might be
interested ib acquiring it as a spare parts source for my TH-21AT.

73 de KC5NG (Dean)



From [e-mail] Mon Jun 03 17:25:41 1996
From: Jim <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: watkins-Johnson
Date: 30 May 1996 18:22:57 GMT
Message-ID: <4okp21$[e-mail]>
References: <4o91g2$1lt$[e-mail]> <4ojhnp$[e-mail]>

bender@doemain (Michael Bender) wrote:
>angel vilaseca ([e-mail]) wrote:
>: Looking for data about the following travelling wave tube:
>: Watkins-Johnson WJ-3104
>
>Have you tried Watkins-Johnson? They have an office in Scotts Valley,

An interesting anecdote came from the North Texas Microwave Society
a few years back -- I don't have any names, so this may be
apocryphal or even an Urban Legend.

It seems that a ham had received what appeared to be a TWT, but with
no documentation and only the manufacturer's ID plate attached.
As he was a serious microwave experimenter, he wanted to know what he
had so he could hook it up and see if it was usable.

So he called the manufacturer.

"Yes, sir, we can provide some information on that unit -- can we get
your address and phone number?  We'll have to get back to you."

And they DID get back to him.  Next morning, Federal agents appeared
on his doorstep and confiscated the TWT. It had accidentally been
improperly disposed of from one of the Dallas-area high tech
skunk works defense contractors, and was classified super top secret,
munitions-grade stuff.

They had been looking for it for a while, and just wanted it back.

So you see, it can be useful to call the manufacturer.  They're usually
quite willing to help identify an unknown part.  And now, with the
advent of cradle-to-grave responsibility for certain hazardous
products, they have a legal requirement to identify and accept for
return certain items.  For example, the battery-operated ionization
smoke detectors that contain a little dab of polonium.

N6OTQ




From [e-mail] Mon Jun 03 17:25:42 1996
From: [e-mail] (JohnsonHE)
Newsgroups: rec.radio.amateur.homebrew
Subject: MC1466/1566 wanted
Date: 30 May 1996 19:10:47 -0400
Message-ID: <4okvm4$[e-mail]>
Reply-To: [e-mail] (JohnsonHE)

Anybody have a few of the above regulators in their junk box that they'd
care to convert to cash? I have supply (homebrew) that uses them, and
they're obsolete part now.

answer to

[e-mail]

W4ZCB


From [e-mail] Mon Jun 03 17:25:43 1996
From: Thad Welch <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Data Conversion
Date: 30 May 1996 19:37:37 GMT
Message-ID: <4okte1$[e-mail]>

I am trying to link two PCs via their serial ports using a
wireless network.  This is a senior design project for one
of my students so I am not looking for a finished
commercial product.

Our real interest is in the DSP based receiver so we don't
want to spend to much time on the data converters.  Most
likely this will be a freespace optical link but an RF link
would be very similar.

We will be starting at low data rates, 300 bps or slower
but would like the ability to easily switch to higher data
rates, 19200 bps or higher.  We would like to be able to
use the full range of data transfer rates available through
a PC serial port.  We need to packetize the data bits and
have read about the AX.25 packet radio system.  A number of
sources discuss the use of a TNC (Terminal-Node Controller)
to interface a PC with a HAM radio.  The first component in
a TNC is called a PAD (Packet Assembler and Disassembler).
As we understand a PAD this bi-directional device packetizes
the output data from the PC serial port and then interfaces
to a modem/radio which makes up the rest of the TNC.  We
just need the PAD or any other device/system that will
convert a PC serial port output to a bi-directional two
wire (one signal and one ground) baseband digital
communications system!  We can then use this data stream to
modulate whatever system we design.

Does anyone out there have a source for a schematic, chip
set or kit to allow us to build this PAD circuit?  Other
solutions or suggestions to help with this data conversion
problem would also be appreciated!  Thanks in advance!

Thad Welch

This post in no way represents the opinion of the United
States Air Force Academy, the United States Air Force or
the United States Government.  It is completely my own
opinion and I take full credit and responsibility for it.




From [e-mail] Mon Jun 03 17:25:44 1996
From: [e-mail] (Roy Lewallen)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: batteryless radio
Date: Thu, 30 May 96 19:52:12 GMT
Message-ID: <4oku7t$[e-mail]>
References: <[e-mail]>

In article <[e-mail]>,
   ron willis <[e-mail]> wrote:
>Am looking for batteryless portable radio.  Heard of this item (crank
>up flywheel, which spins generator, which powers radio) on NPR and didn't
>get acquisition details.  Living in Florida, at the start of the
>hurricane season, and am looking for emergency source of news, weather
>info, etc.

Although the generator-powered radio sounds good from an ecological
standpoint, I don't see its advantage in usefulness over a battery-operated
one unless you're in a location where batteries aren't available. An unused
alkaline battery will easily last for several years, longer if it's kept in
the refrigerator or freezer. And one will run a radio for several hours. As
I recall from an advertisement I saw, the generator-powered radio gives
about ten minutes of play time for one of cranking. You may have other
things you want to do during a hurricane besides spending 10% of your time
cranking.

Roy Lewallen, W7EL


From [e-mail] Mon Jun 03 17:25:45 1996
From: Chuck Bland <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew,rec.radio.amateur.antenna
Subject: Just enough to hang my. . .antenna
Date: 30 May 1996 19:54:16 GMT
Message-ID: <4okud8$[e-mail]>

Greetings,

I'm in the process of hanging a dipole antenna, and I will be using ropes
at the ends to suspend it.

What type of rope should I use? I live in Sacramento, CA. Hot, dry
summers, rainy, windy winters. No snow.

73's

Chuck - n6dbt




From [e-mail] Mon Jun 03 17:25:46 1996
From: [e-mail] (ELA95CDH)
Newsgroups: rec.radio.amateur.homebrew,sci.electronics.repair
Subject: Re: How do you weld solder tabs onto NiCd batteries?  How do you solder to stainless tabs?
Date: 30 May 1996 20:51:43 GMT
Message-ID: <4ol1ov$[e-mail]>
References: <4oe309$[e-mail]>

In article <4oe309$[e-mail]>, [e-mail] says...
>
>I need to weld solder tabs onto a bunch of nicad batteries.
>Thought I'd ask before I risk electrocution.
>


There is a type of solder called "silver solder" available from Maplin
Electronics in England. It may be possible to obtain it elsewhere though.
I have successfully soldered onto battery contacts using this stuff.
A 40W iron should be used and a little bit of the silver solder applied.
Then it should be possible to solder onto this using normal solder. But
don't get the cells too hot as it won't do them any good.

Chris



From [e-mail] Mon Jun 03 17:25:46 1996
From: [e-mail](Anthony Severdia)
Newsgroups: rec.radio.amateur.homebrew,rec.radio.amateur.antenna
Subject: Re: Just enough to hang my. . .antenna
Date: 30 May 1996 22:22:04 GMT
Message-ID: <4ol72c$[e-mail]>
References: <4okud8$[e-mail]>

In <4okud8$[e-mail]> Chuck Bland
<[e-mail]> writes:
>
>Greetings,
>
>I'm in the process of hanging a dipole antenna, and I will be using
ropes
>at the ends to suspend it.
>
>What type of rope should I use? I live in Sacramento, CA. Hot, dry
>summers, rainy, windy winters. No snow.
>

    Polypropylene would be best as an insulator but make sure it
is BLACK for UV resistance (common stuff is yellow).  But, why not
use a couple of cheap glass insulators?

    Braided Nylon is NG because it deterioriates pretty fast.
Dacron is much better and stretches less.

    -=Tony=-    W6ANV   San Francisco



From [e-mail] Mon Jun 03 17:25:47 1996
From: [e-mail] (Tom Bruhns)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: 10 to 30 hz White Noise Generator
Date: 30 May 1996 22:39:49 GMT
Distribution: na
Message-ID: <4ol83l$[e-mail]>
References: <[e-mail]>

Randy Petersen ([e-mail]) wrote:
: I have a project that I am working on which requires a 10 to 30 hz
: broad range white noise generator. I have found many subaudible tone
: generator circuits, but have not found a circuit that would put out
: 10 to 30 hz as white noise. This will be used for some masking and
: attenuation experiments. If you can help please let me know.

Of course, white noise is by definition very broadband; you only want
a little over an octave bandwidth.  You would do well to specify what you
want to happen outside that 10-30Hz band.  Assuming that you can come
up with an acceptable filter (perhaps just a low-pass filter), it should
be trivial to generate a bitstream to feed the filter to get you what
you want.  A binary shift register sequence should do the job; if you
want to ensure some particular statistics (especially important if you
are testing something that is both nonlinear and has memory), you may
need additional help (email me...).  Anyway, clocking at even 1k/sec
would give you ample bandwidth to filter, and if the generator is,
say, 32 bits, it won't repeat for a very long time...about a month and a
half.  You should be able to do it in software if you can guarantee that
the update rate will be constant, outputting to a parallel or serial port
on a PC.  Or do it in hardware with a shift register and parity generator.

(Or if you have access to one of my employer's dynamic signal analyzers
such as the HP3562, HP35665A or HP35670A, it will do the job directly...)

--
Cheers,
Tom
[e-mail]


From [e-mail] Mon Jun 03 17:25:49 1996
From: [e-mail] (TIEMANN BRUCE)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: 10 to 30 hz White Noise Generator
Date: 30 May 1996 23:27:10 GMT
Message-ID: <4olase$[e-mail]>
References: <[e-mail]> <4ol3rm$[e-mail]>

From [e-mail] Thu May 30 17:11:49 MDT 1996

   [e-mail] (Randy Petersen) wrote:

:>I have a project that I am working on which requires a 10 to 30 hz
:>broad range white noise generator. I have found many subaudible tone
:>generator circuits, but have not found a circuit that would put out
:>10 to 30 hz as white noise. This will be used for some masking and
:>attenuation experiments. If you can help please let me know.

>Most white noise generators in this range also output over the
>entire audio spectrum.  If that's acceptable, you can probably
>find something in a local library under acoustic testing.

>If the generator you need must only output 10 to 30 Hz, I suspect
>it will be a pretty sophisticated instrument.  Perhaps a sound card
>and computer program could generate a pseudo-random (white) noise
>only in the desired range.

Another possibility is to use a broad-spectrum noise generator, and then put
it through some active bandpass filters.  The "Active Filter Cookbook,"
published (I think) by SAMS, inc., has ripoff circuits (that is, with all the
parts assigned values) and complete instructions (and worked examples) how to
make such things given only op-amps, resistors, and capacitors.  However, it
contains no "brick wall" filters that pass no energy outside the given band.
But a sixth order highpass at 10 Hz followed by a similar lowpass at 30 Hz
might be good enough for you, and the book makes it clear how to design one.
(Whether Butterworth, Bessel, or 1-, 2-, or 3-dB dips Chebyshev, by the way.
And it shows you what the difference between them is.)

It would require a couple of quad op-amps and a small handful of Rs and Cs.

Bruce
N6URH


From [e-mail] Mon Jun 03 17:25:49 1996
From: [e-mail] (Kevin  AstirCS "1U"   KO0B)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Here is how to solder Nicads without tabs
Date: Fri, 31 May 1996 09:40:55 -0700 (PDT)
Message-ID: <4on3sb$[e-mail]>
References: <[e-mail]> <4oj1c7$[e-mail]>

You might also check with some of the RC car types.

The racers think the tabs have to much resistance, so they always
solder up thier own packs using flat braid & matched cells.

Of course they abuse the cells (rapid charge & discharge) , so if life
in "normal" service were reduced by 50% they probably wouldn't notice
it.

-ko0b



From [e-mail] Mon Jun 03 17:25:51 1996
From: Don Huff <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Relays-fast?
Date: Fri, 31 May 1996 12:16:06 -0700
Message-ID: <[e-mail]>
References: <4oms3p$[e-mail]> <4on820$[e-mail]>

W8JI Tom wrote:
>
> Does anyone know a source of fast relays suitable for HF amplifiers?
> 73 Tom
Tom,

  How fast is fast?   For example, most open frame relays are adequate.
My
SB-220 amp has a 3P2T open frame relay, which works fine for AMTOR,
PACTOR, etc
as-is.  Have used it for years on these modes.  I have also measured the
t/r
times of my TS820, which has two relays, one of them being a 4P2T job.
The
whole system switches in under 15 mS, again, plenty fast enough for
those modes.
So my suggestion is, use any reasonable relay, not oversized, for the
job.
  There seems to be a lot of myth out there about "fast switching",and
that relays
cannot do it.  Wrong in many cases.  I once worked a ham on AMTOR who
had just spent hundreds of dollars on a PIN diode T/R switching box for
use with his
SB-220.  When I told  him I was also using a SB-220 which was
essentially in
stock condition, he told me that what I was doing was impossible!  Ah
well,
no one likes to admit he's been zapped by the marketeers again...

73, GL,
            Don,  W6JL


From [e-mail] Mon Jun 03 17:25:52 1996
From: Stan Witherspoon <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: how get into ICOM battery packs?
Date: Fri, 31 May 1996 12:45:38 -0700
Message-ID: <[e-mail]>
References: <[e-mail]>

Myron A. Calhoun wrote:
>
> I have ICOM BP-82 and BP-84 battery packs which I really need to get into
> so I can replace a cell or two.  If someone has already "chewed" his/her
> way into such a pack, I'd sure appreciate suggestions!
>
> --Myron.
> --
> # Five boxes preserve our freedoms:  soap, ballot, witness, jury, and cartri
dge
> # PhD EE; Associate Professor  [phone] work  532-7353 fax  [phone] h
ome
> # NRA Life Member and Certified Instructor (Home Firearm Safety, Rifle, Pist
ol)

I'm not familiar with the above ICOM packs, but I have had good luck
putting my Yeasu packs in the freezer for a while and then smacking the
seam against a sharp
edge like the edge of a table to break the glue joint and then prying
the pack open

stan
--
---  Stan Witherspoon  N6SCE     -----          Disclaimer           ---
-    Systems Technology Div.       -   These are my personal opinions  -
-    Hewlett Packard Company       -   and do not represent the views  -
-    8000 Foothills Blvd. MS 5596  -   of anyone or anything else.     -
---  Roseville,Ca.95747-5596     -----    [e-mail]  ---


From [e-mail] Mon Jun 03 17:25:52 1996
From: [e-mail] (Tom Swisher)
Newsgroups: rec.radio.amateur.homebrew
Subject: Repeater Projects
Date: 31 May 1996 12:48:40 -0400
Message-ID: <4on7t8$[e-mail]>
Keywords: repeater,projects


As I am currently embarking upon rebuild number 3 of my 2m/70cm repeaters,
I'm looking for interesting and useful (and relatively easy) projects to make
the system better.

I'm especially looking for audio tailoring circuits and audio delay lines,
but anything useful will be added to the "Things To Do" notebook for future
consideration. Does anyone have any suggestions? To save bandwidth on the
newsgroup, please reply via e-mail to the below address. Thanks for any
assistance anyone can provide.

Tom Swisher, N8GQK
[e-mail]


From [e-mail] Mon Jun 03 17:25:53 1996
From: [e-mail] (W8JI  Tom)
Newsgroups: rec.radio.amateur.homebrew
Subject: Relays-fast?
Date: 31 May 1996 12:51:12 -0400
Message-ID: <4on820$[e-mail]>
References: <4oms3p$[e-mail]>

Does anyone know a source of fast relays suitable for HF amplifiers?
73 Tom


From [e-mail] Mon Jun 03 17:25:55 1996
From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew,rec.radio.amateur.antenna
Subject: Re: Just enough to hang my. . .antenna
Date: 31 May 1996 13:27:21 GMT
Message-ID: <4oms3p$[e-mail]>
References: <4okud8$[e-mail]>
Reply-To: [e-mail]

In <4okud8$[e-mail]>, Chuck Bland <BlandRanch@wor
ldnet.att.net> writes:
>Greetings,
>
>I'm in the process of hanging a dipole antenna, and I will be using ropes
>at the ends to suspend it.
>
>What type of rope should I use? I live in Sacramento, CA. Hot, dry
>summers, rainy, windy winters. No snow.
>
>73's
>
>Chuck - n6dbt
>
>
 How long is the dipole? How heavy is the wire you intend to use? How
 long does the rope have to be? Overall, nylon rope works pretty well.
 I have a 160 Meter dipole held up by thick string nylon. You can pick up
a spool at a Builders Square, Lowes, etc for 4-5 bucks. About 230 feet of
this heavy string. I double it, it lasts 3-4 years in very harsh northern Indi
ana
weather. I guess the rule of thumb is to get only what you need. Some of
this 'parachute cord' will outlast you and your QTH, but it's very salty.

                                                                    Jim



From [e-mail] Mon Jun 03 17:25:55 1996
Newsgroups: rec.radio.amateur.equipment,rec.radio.swap,rec.radio.amateur.homebrew
From: [e-mail] (Steve Ellington)
Subject: Re: Anyone got a service manual for President Lincoln??
Message-ID: <[e-mail]>
References: <[e-mail]> <[e-mail]>
Date: Fri, 31 May 1996 13:54:51 GMT


Would you settle for a service manual for President Clinton? It's much
more compact.


: > As the subject tells, I am looking for a service manual for President
: > Lincoln.
: > If you have one, please mail me. I would be interrested of a copy.
: >
: > Erik

: Perhaps the Walter Reed Army Medical Center or Bethesda Naval Hospital in
: Washington, DC could supply one.

: Sorry, couldn't resist :-)

: WA3ZXO

--
Steve Ellington [e-mail]  Louisville, Ky


From [e-mail] Mon Jun 03 17:25:56 1996
From: [e-mail] (WB3U)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Saturation in toroid cores
Date: Fri, 31 May 96 14:24:42 GMT
Message-ID: <4on3nj$[e-mail]>
References: <4nc17k$[e-mail]> <4nde65$[e-mail]> <4nekln$[e-mail]> <4nu20t$[e-mail]> <4nvb8q$[e-mail]> <4o2pkq$[e-mail]> <4obh1t$[e-mail]> <4octvd$[e-mail]> <4olqju$[e-mail]>

   [e-mail] (Wilbert Knol) wrote:

>Thanks for the clarification Kevin. It sounds like the proper way
>to monitor flux change in a core is to monitor the voltage across a
>winding, as according to Faraday, this voltage must be proportional
>to dB/dt, regardless of saturation.
>
>In case of saturation, B no longer follows H. So, to check for
>saturation in a toroid inductor in a output network of a transmitter,
>I would measure the current into the winding with a current probe
>hooked up to an oscilloscope, and display it against the voltage
>across the winding.

Another method is to measure the distortion products as the signal
is increased and note the point at which they begin to rise.

73,
Jack  WB3U


From [e-mail] Mon Jun 03 17:25:58 1996
From: [e-mail] (WB3U)
Newsgroups: rec.radio.amateur.antenna,rec.radio.amateur.homebrew
Subject: Re: need help with wire dipole
Date: Fri, 31 May 96 14:25:15 GMT
Message-ID: <4on3oj$[e-mail]>
References: <[e-mail]> <4ogtug$[e-mail]> <4okuue$[e-mail]>

   Chuck Bland <[e-mail]> wrote:

>A link-coupled tuner would do the job quite nicely. Sure, it may
>set technology back about 30 years, but the system would be better
>than a "mere balun".

The unqualified use of baluns is what has set the Amateur community
back thirty years.  Overlooking the advantages and versatility of
link coupling on the basis of its age is akin to replacing the
family sedan with a hovercraft.  ;)

73,
Jack  WB3U


From [e-mail] Mon Jun 03 17:25:59 1996
From: [e-mail] (Chuck Bland)
Newsgroups: rec.radio.amateur.homebrew,rec.radio.amateur.antenna
Subject: Re: Just enough to hang my. . .antenna
Date: 31 May 1996 16:13:21 GMT
Message-ID: <4on5r1$[e-mail]>
References: <4okud8$[e-mail]> <4ol72c$[e-mail]>

In article <4ol72c$[e-mail]>, [e-mail]
says...
>
>In <4okud8$[e-mail]> Chuck Bland
><[e-mail]> writes:
>>
>>Greetings,
>>
>>I'm in the process of hanging a dipole antenna, and I will be using
>ropes
>>at the ends to suspend it.
>>
>>What type of rope should I use? I live in Sacramento, CA. Hot, dry
>>summers, rainy, windy winters. No snow.
>>
>
>    Polypropylene would be best as an insulator but make sure it
>is BLACK for UV resistance (common stuff is yellow).  But, why not
>use a couple of cheap glass insulators?
>
>    Braided Nylon is NG because it deterioriates pretty fast.
>Dacron is much better and stretches less.
>
>    -=Tony=-    W6ANV   San Francisco
>

Well, there are insulators on the end of the antenna, but I'll need some
rope to tie to the other end of the insulators to suspend the antenna in
the air.

Chuck - n6dbt



From [e-mail] Mon Jun 03 17:25:59 1996
Newsgroups: rec.radio.amateur.homebrew
From: [e-mail] (David Feldman)
Subject: Sizing toroid core for use in tube pi-net?
Message-ID: <[e-mail]>
Date: Fri, 31 May 1996 18:48:45 GMT

Is there any sort of rule-of-thumb on choosing the correct core size for a
toroid core tube used as substitue for air core coil in a tube-output HF
final/amplifier section? For example, at 7 MHz, 700 volts/300 mA (maybe
100W output...) would a T200-2 core be required, or could a smaller one
be used, or would the T200-2 even be sufficient? If you wanted to make a
multi-band output network (with tapped coil), would you need to size the
core for the highest operating frequency (assuming similar tube operating
point for each frequency)?

Any advice appreciated,

73 Dave WB0GAZ [e-mail]