QRZ! Ham Radio 4/QRZ Ham Radio Callsign Database - Volume 4.iso/digests/equip/940021.txt

Internet Message Format | 1994-11-14 | 19KB

Date: Thu,  3 Feb 94 04:30:31 PST
From: Ham-Equip Mailing List and Newsgroup <[e-mail]>
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Subject: Ham-Equip Digest V94 #21
To: Ham-Equip


Ham-Equip Digest            Thu,  3 Feb 94       Volume 94 : Issue   21

Today's Topics:
       Adapting FT-530 to use cigarette lighter of car (2 msgs)
               ICF-2010, indentifying components, help!
                       ICF-2010: adding filter,
                   ICOM - IC-R71A - help it's dead
                    Interfacing TS50S and SGC-230
           Schematic for Tokyo Hi Power 70cm 100W amplifier
                  SMALL 2m HT wanted for my wife...
                     Variable capacitors... help!
       What are Motorola Micors going for these days? (2 msgs)
                  Where to find spectrum analyzers?

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Archives of past issues of the Ham-Equip Digest are available
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We trust that readers are intelligent enough to realize that all text
herein consists of personal comments and does not represent the official
policies or positions of any party.  Your mileage may vary.  So there.
----------------------------------------------------------------------

Date: 1 Feb 1994 11:22:28 -0500
From: mvb.saic.com!unogate!news.service.uci.edu!usc!howland.reston.ans.net!europa.eng.gtefsd.com!emory!news-feed-2.peachnet.edu!st6000.sct.edu![e-mail]
Subject: Adapting FT-530 to use cigarette lighter of car
To: [e-mail]

I would reccommend filtering of some kind.. or if you don't mind the brick
sticking out of your dash... get the thing from yaesu...
My car wouldn't exactly allow that kind of protrusion so I just got the
power cable and the whine was most annoying...  it's worse on receive than
transmit..  I had a 470 and had similar problems, but not as bad.  I guess
you sacrifice filtering for a nicer radio with more bells & whistles...

I still love my '530.

Good Luck and 73

Matt Smith
KD4HME
[e-mail]

------------------------------

Date: Tue, 1 Feb 1994 20:52:46 GMT
From: world![e-mail]
Subject: Adapting FT-530 to use cigarette lighter of car
To: [e-mail]

In article <2ik4f0$[e-mail]> [e-mail] (Norman Angerhofer) writes:
>I would like to run my FT-530 from the 13.8v DC coming from the
>cigarette lighter of my car (while the car is running).
>
>Do I need to do anything to condition the 13.8v before feeding it
>into the DC input of the FT-530?  Namely:
>
>  1) Do i need to filter the DC to prevent engine noise from coming
>     through?
>  2) Add some sort of Zener diodes or MOV's to prevent voltage
>     surges from wiping out my radio?
>
>(I would rather not buy the $29.95 adapter which Yaesu makes if I can
> provide equally good protection for the radio for much less.)

Buy the adapter from Yaesu. It provides the needed filtering and is very
nicely packaged. That $29 is a small drop in the bucket compared to the
price of the radio. Do you really want to experiment on your own circuits
in this case?

>
>--Norman Angerhofer AA7QG
>  [e-mail]
>
>
>--
>Norman Angerhofer    [e-mail]
>540 Arapeen Dr.
>SLC, UT  84108


--
---------------------------------------------------------------
Daniel Senie                 Internet:     [e-mail]
Daniel Senie Consulting                    [e-mail]
508-365-5352                 Compuserve:   74176,1347

------------------------------

Date: Sun, 30 Jan 1994 16:16:40 GMT
From: agate!howland.reston.ans.net!newsserver.jvnc.net!raffles.technet.sg!ntuix!ntuvax.ntu.ac.sg![e-mail]
Subject: ICF-2010, indentifying components, help!
To: [e-mail]

Hi,

    Does anyone here have an ICF-2010/2001D service manual? I need
some help indentifying components:-

    1) junction of R106,R113 and R118
    2) gate of Q22
    3) gate of Q31

Can someone send me a GIF of the relevant section or maybe put it in the
mail for me? Perhaps a detailed description is sufficient?

    Tks.

73 de 9V Daniel

------------------------------

Date: 1 Feb 1994 15:28:16 GMT
From: news.cstar.andersen.com!news.acns.nwu.edu!casbah.acns.nwu.edu![e-mail]
Subject: ICF-2010: adding filter,
To: [e-mail]

In article <[e-mail]>,
Jack Treger <[e-mail]> wrote:
>
>   Kiwa sells filters for the 2010 and can be reached at 1-800-398-1146.
>   The prices is 14 and 40 dollars for the wideband and narrowband mods,

>   respectively.  The filters have zero insertion loss so overall signal
                       ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
>   strength is increased since the stock filters do insert loss.

I have a hard time believing this.  I expect the filter to be a ceramic
or a crystal (less likely) type.  These filters always have an insertion loss.

Rajiv
aa9ch
[e-mail]

------------------------------

Date: Mon, 31 Jan 1994 14:40:58 GMT
From: library.ucla.edu!europa.eng.gtefsd.com!paladin.american.edu!howland.reston.ans.net!spool.mu.edu!news.nd.edu!news1.oakland.edu!destroyer!nntp.cs.ubc.ca!alberta!ve6mgs![e-mail]
Subject: ICOM - IC-R71A - help it's dead
To: [e-mail]

>It's unfortunately true.  The 71's ram is factory programmed and is kept
>alive by the battery.  When it goes, the radio cannot reset itself so
>nothing comes up.

You can replace the battery `live' (Power On) if you have an isolated tip
soldering iron. My radio has not aged enough, but N5OFF/Thomas Marcotte did
this on his 751.

If you are truly leary, you have options of building your own programmer/reader
for the unit (I used a microprocessor to read/write my '751's memory, but a
set of dip switches and buffered lights could be done if you are microprocessor
challenged ...), ICOM can reprogram it for you, and some dealers will be able
to change the battery and either retain the program, or re-program it.

>Since the batteries last about 5 years, the average life of the rcvr, Icom
>didn''t worry too much about it.

First off, it has a 10 year life, second, why should ICOM worry about it, so
you lose the radio while you fall victim to a standard procedure to replace
the battery and/or and reprograme the memory, why would this be a big deal?

In addition, re-programming the unit *can* be an opportunity to extend the
frequency range of operation up to 39MHz and alter other characteristics, do
you have a problem with this gold mine of opportunity, or did you want a
Kenwood with a 3 year lifespan and a VCO that doesn't stay in lock because of
the phenolic PC board cracking it's coils ...

>You'd thinkthey would have issued a retrofit
>eprom but no such luck.  Let me know what you find out on this one via
>e-mail or here, I have a personal stake in your findings hi hi.

There are aftermarket RAM extension modules that you may be interested in,
Contact N5OFF at [e-mail] or [e-mail] and ask him what
he feels about it (QST just rejected his article about one of these add-ons
suitable for R71/R751 series of rigs).

Ciao, 73 de VE6MGS/Mark -sk-

------------------------------

Date: Tue, 01 Feb 1994 11:16:35 -0700
From: ftpbox!mothost!schbbs!waters.corp.mot.com.corp.mot.com![e-mail]
Subject: Interfacing TS50S and SGC-230
To: [e-mail]

The TS50S seems to be a natural companion to the SGC230 antenna tuner.

The SGC is about the only thing that will tune just about anything as an
antenna, the only problem is - can you interface the optional "tune"
control and LED line from the SGC to the "Tune" switch and LED on the TS50?

Obviously you coud butcher the TS 50, but it would be nice to do it from
the accessory plug.  Anyone know how the Kenwood tuners are interfaced or
what is required?

Thanks and 73

Mike AA4MW

------------------------------

Date: Tue, 1 Feb 1994 15:00:31 GMT
From: mvb.saic.com!unogate!news.service.uci.edu!usc!howland.reston.ans.net!europa.eng.gtefsd.com!darwin.sura.net!fconvx.ncifcrf.gov![e-mail]
Subject: Schematic for Tokyo Hi Power 70cm 100W amplifier
To: [e-mail]

    Does anyone have the above schematic, I'll pay any reasonable costs.

    Tnx Joe Mack NA3T
    [e-mail]
    (Nat Inst Health)
    (301)-402-4573 (w)

------------------------------

Date: Tue, 1 Feb 1994 21:51:07 GMT
From: library.ucla.edu!europa.eng.gtefsd.com!howland.reston.ans.net!cs.utexas.edu!swrinde!sgiblab!sgigate.sgi.com!olivea!news.bu.edu!att-in!cbnewsm![e-mail]
Subject: SMALL 2m HT wanted for my wife...
To: [e-mail]

In article <[e-mail]>, [e-mail] (Curtis N. Bingham) writes:
>
> I've just convinced my wife that she needs a radio! Yippee!  :-)
>
> I have an Yaesu FT-530, but don't ever use the 440 here in this part
> of the world, so would like to buy a simple, _small_ 2m radio.
>
> I've seen the Kenwood TH-28A, and like the size.  Are there any other
> radios out that this small?  I know that Yaesu just came out with a
> _real_ small one, but it can't output more than about 2.5 watts (I
> could be wrong--it's been a while since I read the ad).
>
> Any ideas?  Suggestions?  Testimonials? :-)
>
> Thanx,
>
> Curtis
>
> --
> ___________________________________________________________________________
> Curtis N. Bingham  |  Pacific Northwest Laboratory  |  [e-mail]  |
> Research Scientist |  Battelle Boulevard M/S K1-87  |  [phone] FAX  |
>      KB7YAM        |     Richland, WA  99352        |  [phone]      |
>            My opinions are my own (when I can remember them!)
>
>
>

Look at the FT 416.  It uses the same battery as your FT 530.
My son has one and really likes his.  And we just ordered one for my wife
to replace her old u2AT (now need 3 different pl tones and two splits which
is possible but a pain with the u2, ((anyoffers?)) . There is a super sale
on the FT 416 .  Output is 2.5 W @ 7.2 V ; 5W@ 12 V.  Battery is 600 mA.
Shel Darack WA2UBK  [e-mail]

------------------------------

Date: Sun, 30 Jan 1994 14:49:06 GMT
From: agate!howland.reston.ans.net!gatech!wa4mei.ping.com!ke4zv![e-mail]
Subject: Variable capacitors... help!
To: [e-mail]

In article <[e-mail]> [e-mail] (Bruce Pea) writes:
>I'm trying to put together an antenna tuner and I need
>the following. Could someone please point me to a source
>for these parts:
>200-pf transmitting variable capacitor with plate spacing
>of 0.075 inch or greater (J.W. Miller Co. #2150)
>200-pf dual-section variable capacitor, same plate
>spacing as above (J.W. Miller Co. #2151)
>25-uH minimum inductance, rotary inductor, (E.F. Johnson
>#229-203)
>I have called all over the place trying to find a place
>that has these things with no luck. Geeeze, I can't
>even find J.W. Miller Co.'s phone number in Compton,
>CA.
>Any help with this stuff would be GREATLY appreciated!!

Radiokit in New Hampshire had all those items in their
catalog. The owner died, but I think his wife is still
carrying on the business. Here's the contact info I
have

Radiokit
PO Box 973
Pelham, NH 03076
603-635-2235

Gary

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

------------------------------

Date: Tue, 1 Feb 1994 19:09:25 GMT
From: mvb.saic.com!unogate!news.service.uci.edu!usc!elroy.jpl.nasa.gov!swrinde!sgiblab!a2i![e-mail]
Subject: What are Motorola Micors going for these days?
To: [e-mail]

>In article <[e-mail]>, [e-mail]
>wrote:

>> I have a chance to buy some Motorola Micors, but I'm not sure what a fair
>> price is.  Can someone clue me in as to what these are going for?  Is there
>> an easy way for me to be certain of the frequency range they cover?

Price tends to be $20-100 depending on features, rust, power, etc...
Generally the Motorola band plan is found in the third character of
the model number, for instance T34RTA3100 etc. The "T" indicates
trunk mount mobile, the 3 indicates the power level, the 4 indicates
the frequency band. The next three characters indicate the model type
(RTA is early Micor) and the final four digits indicate type of squelch,
number of channels, bandwidth, etc.

The power digit for Micors is typically 3=35w 4=60w 5=90w 6=110w I think.

The frequency digit is 2=30-50, 3=150-170, 4=450-512, 5=800-900 (again this
is from memory but will be close).
Good luck

--
David Josephson <[e-mail]>

------------------------------

Date: Mon, 31 Jan 94 11:05:30 edt
From: pa.dec.com!radio.nl.nuwc.navy.mil![e-mail]
Subject: What are Motorola Micors going for these days?
To: [e-mail]

I have a chance to buy some Motorola Micors, but I'm not sure what a fair
price is.  Can someone clue me in as to what these are going for?  Is there
an easy way for me to be certain of the frequency range they cover?

Thanks,
Keith (WA2Q)
---
[e-mail]

------------------------------

Date: Sun, 30 Jan 1994 14:36:35 GMT
From: agate!howland.reston.ans.net!gatech!wa4mei.ping.com!ke4zv![e-mail]
Subject: Where to find spectrum analyzers?
To: [e-mail]

In article <2icnp1$[e-mail]> [e-mail] (Stephen C. Trier) writes:
>Are there any tricks on finding affordable spectrum analyzers?  What is
>the reasonable price range for them?  I've seen a few advertised in ham
>radio catalogs, but they don't seem to be listed in the usual
>electronic equipment catalogs.

Well the last one I bought, a Tektronix 491, a 1970 vintage 10 MHz to
40 GHz unit with an excellent CRT, cost me $700 with manual at the
Atlanta Hamfest. That's a good deal, but other lab grade analyzers of
that vintage should also sell for less than $1,000. A newer, more directly
ham oriented unit, but still used, a duplex communications monitor with
wattmeter, signal generator, TT and CTCSS generate/decode, SINAD capability,
and spectrum analyzer all in one like the IFR 1200, is going to cost around
$2500-$3000. A IFR 1500 with tracking generator is higher still. New IFRs are
only affordable by service shops, running about $20,000+, not for the typical
amateur. There are cheaper new units, a couple of companies make new analyzers
for under $2,000, but you have to be careful that they have the resolution
and dispersion for your application. They're generally aimed at the cable
industry and won't resolve down to voice bandwidths. New lab grade analyzers
are just out of sight for the amateur. Almost all of them are well over
$20,000.

For most typical amateur uses below 1 GHz, the IFR 1200 is perfectly
acceptable. If you tune a lot of duplexers, the IFR 1500 may be worth
the extra cost. If you're working above 1 GHz, then one of the satellite
earth station units may be acceptable, or you may have to go to a lab grade
unit depending on the resolution you need. Older lab grade equipment may
be a bit fussy to use, but they'll still give you accurate information.

Then there's the Science Workshop kit that's been discussed here before.
If you don't need precise calibration and just need to look at the
spectrum below 500 MHz for relative signal levels, then it can be had
for under $500 total. It's really a basic kit and a collection of upgrade
kits which add more features so that it approaches, crudely, a poor man's
version of the IFR 1500. You have to supply your own scope display.

Finally there are panadaptors or station monitors. These attach to your
receiver, or transceiver, IF stage and give you a peek at signals near
your frequency. Heathkit used to sell one, and Kenwood still does. Note
that these units only work with certain radios. Then there are the Icom
IC-781 and the Standard scanner which have built in panadaptor displays.
They're rather crude for serious use, however, and the radio part isn't
cheap either. (I'd still like to have the Standard. It's a neat toy.)

A note on buying used spectrum analyzers, check them out carefully
before laying down heavy cash. Replacement CRTs may no longer be
available for some of the older units, so make sure the CRT is in
good shape. Also test to see that the input attenuators haven't been
fried, and that the frequency calibration is correct. Try the dispersion
controls and all the resolution bandwidths. If there's a calibrated
signal generator handy, usually at the sponsoring club's test bench
at hamfests, make sure the log and linear signal strength calibrations
are in order. Don't pay a lot for one without a manual. That's a necessity
to learn how to properly use the instrument, and is also necessary if the
unit eventually needs repair.

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

------------------------------

Date: 2 Feb 1994 15:50:17 -0600
From: newshub.nosc.mil!crash!news.sprintlink.net!news.i-link.com!news.i-link.com![e-mail]
To: [e-mail]

References <ah301-260194121225@129.228.248.39>, <2icphn$[e-mail]>, <[e-mail]>a
Subject : Re: htx-202 or dj-162 ?

[e-mail] wrote:
: James Biehn ([e-mail]) wrote:
: : Jerry Sy ([e-mail]) wrote:
: : : I have pretty much narrowed down my choice to these two 2m ht's.

: : : I'd like to get comments and opinions from people in the net who
: : : have actually used both.

: : : currently, I am leaning towards the dj-162 because of its wide
: : : receive.

: : : please email responses if possible.
: : : thanks in advance.

: : : jerry
: : Jerry, I myself have used both and found the DJ-162 all around better in
: : its operations as well as its structure. The HTX-202 has no Mod info and
: : is virtually an unknown radio internally. Maybe time will change that, but
: : meantime technology moves on.

:    So you're saying that you *LIKE* intermod?

:    :-)

: - Rich

: --
: Rich Mulvey                 Amateur Radio: N2VDS              Rochester, NY
: [e-mail]           "Full power on half a watt."
Rich, the problem is that todays HAM is a buyer not a builder. Thae
closest thing to this now days is a loose radio and a reliable set of
mods. Is this truly HAM radio, that is the true question.

------------------------------

End of Ham-Equip Digest V94 #21
******************************