Ham Radio/Ham Radio CD-ROM (Emerald Software) (1995).ISO/news/inham03/816

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INFO-HAMS Digest            Sat, 28 Oct 89       Volume 89 : Issue 816

Today's Topics:
                         89 Supplement...Help
                          Aircraft headsets
                 Aviation NAVAIDS (long, lonter now)
                       Cellular Telephone Info
                DIRECTION FINDING EQUIPMENT (SuperDF)
                       John F. Rider Publishing
          Need Help/Schematic with Kenwood MC-46 Microphone
                Over-the-horizon Radar (was Re: Radar)
                 pre-novice seeking equipment advice
                Some new federal frequency allocations
                        Uniden HR-2510 on CB ?
               Uniden President HR-2600 - info request
                   Where do YOU buy parts? (2 msgs)
                   Wondering about 455 kHz (2 msgs)
----------------------------------------------------------------------

Date: 27 Oct 89 20:29:32 GMT
From: att!cbnewsc![e-mail]  (a.scott.berman)
Subject: 89 Supplement...Help

Could someone with a 89 Callbook Supplement send the name and address
of WV0P....   I made my long sought first Nebraska contact last night
only to find him not in the 89 Callbook.

Many thanks     Send to att!ihlpl!berman

Scott Berman  WD9EMZ

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

Date: 26 Oct 89 20:40:00 GMT
From: uokmax!occrsh!occrsh.ATT.COM!QAOKIS.UUCP![e-mail]
Subject: Aircraft headsets

Ripoff Shack has those mikes for about $3.00.

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

Date: 27 Oct 89 22:27:26 GMT
From: zephyr.ens.tek.com!vice![e-mail]  (George Pell)
Subject: Aviation NAVAIDS (long, lonter now)

In article <232@pmday_2..Dayton.NCR.COM> steve@pmday_2.Dayton.NCR.COM (Steve Bridges) writes:
+In article <[e-mail]> [e-mail] (Michael Harpe) writes:
+>
+>Aviation NAVAIDS are some of the slicker applications of radio
+>technology that you will ever find.....
+>
+>VOR - Stands for VHF Omni Ranging (I think).  System uses a ground-based
+>transmitter that sends a phase encoded signal that looks like a "radio
+>compass" to the receiver......
+
+Actually, the VOR transmiitter has a rotating beacon that rotates through
+360 degrees and somehow encodes the bearing into the signal.  The receiver
+in the aircraft decodes this and indicates through the OBS (Omni-bearing
+selector) indicator how far left or right of the selected radial you are.
+......

The VOR sends out two signals, one is a reference sin wave FM modulated
on the carrier, The other is an electronically swept AM signal.  When
the two signals are in phase, the AM signal is sweeping magnetic north.

The receiver compares the phase of the two signals, compares that to the
desired 'radial' as set by the OBS, and indicates a 'fly left' or 'fly
right' via a meter movement.

Some receivers (such as my handheld) will read out directly the radial
it is receiving.

geo

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

Date: 20 Oct 89 22:25:28 GMT
From: psuvm!auvm![e-mail]  (Richard B. Edelman)
Subject: Cellular Telephone Info

Can anyone recommend a good >>technical<< reference on how the
cellular telephone network operates?

Thanks,
Richard Edelman, KH6RE

[e-mail]

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

Date: 27 Oct 89 14:41:59 GMT
From: asuvax!anasaz![e-mail]  (John Moore)
Subject: DIRECTION FINDING EQUIPMENT (SuperDF)

In article <[e-mail]> [e-mail] (Jim Lips Earl) writes:
]
]Just how much does this SuperDF thingamabob cost?  I love going on T-Hunts.

Funny you should ask. I just ordered one yesterday. The kit costs were:
  Control Unit SDC2-K  135.60
  100-260Mhz Antenna SDV1-FRK 57.75
  250-500Mhz Antenna SDU1-FRK?? 49.50
  Shipping and Handling: 7.50

>From BMG Engineering
      9935 Garibaldi
      Temple City, CA 91780
]I've seen those doppler units in Mobile Radio Tech., but I've yet to see a
]price.  How much are we talking about here?  The cheapest one I'd seen was
          Many hundreds to thousands.
]a kit from Dick Smith.  I don't even know if they make them anymore.


They do. You don't want it! You should buy a copy of Joe Moell's
book on T-hunting (HRO carries it).

--
John Moore (NJ7E)           mcdphx!anasaz!john asuvax!anasaz!john
[phone] (day or eve) long palladium, short petroleum
7525 Clearwater Pkwy, Scottsdale, AZ 85253
The 2nd amendment is about military weapons, NOT JUST hunting weapons!

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

Date: 27 Oct 89 14:09:58 GMT
From: texbell!swbatl![e-mail]  (4237)
Subject: John F. Rider Publishing

Any vacuum tube era radio repair people out here?  I have some questions.

I have a fair number of books in my collection from the John F. Rider
publishing company.  Many, perhaps most, of these books are by John F. Rider,
especially during the 30's.  Is anyone familar with this publishing company
and it's history?  Is it still in existence? I know that John Rider was born
in 1900.  Is he still alive?  Anyone met him personally?
How in the world did he manage to write so many books in such a short time?
How were Rider publications perceived as compared to Sam's and Audel?
What were the typical references used for repair work? For education?
--
#    ---Tom Adams---    | uunet!swbatl!uusgta or [e-mail]
# I collect pre-1930 wireless, electrical and scientific books.
# opinions... Opinions? I don't think I'm allowed to have opinions.

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

Date: 26 Oct 89 15:54:57 GMT
From: gem.mps.ohio-state.edu!samsung!shadooby!mailrus!jarvis.csri.toronto.edu!utgpu!utzoo!mnetor!ghp![e-mail]  (Jim Stewart)
Subject: Need Help/Schematic with Kenwood MC-46 Microphone

I just bought a 2 metre Kenwood from a friend.  Part of the
deal was an MC-46 microphone, this one has a pre-amp and touch
tone pad.  Although it was working, now the voice half of things
no longer works (i.e., I can get tones out, but nobody can hear
my voice).  My first guess is in the pre-amp.

Although the pre-amp is small, a schematic would be very helpful
(the transistors have stange markings of course).  I have the
service manual for the rig, but it doesn't have anything for this
mic.

Can anybody help me out, either with suggestions or the schematic?

tnx
--
Jim Stewart, VE3SRJ
UUCP:  [e-mail]
BELL:  [phone]

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

Date: 27 Oct 89 22:14:33 GMT
From: zephyr.ens.tek.com!vice![e-mail]  (George Pell)
Subject: Over-the-horizon Radar (was Re: Radar)

In article <[e-mail]> [e-mail] (Biff Henderson) writes:
+I toured Grand Forks Air Force Base outside Grand Forks, North Dakota,
+over the summer, and they told us that a top priority project is building
+an over-the-horizon radar system.  I don't know anything about the
+status of the construction (i.e. just dreaming or actually building)....

The receiving portion of this radar is under construction in Christmas
Valley, Oregon.  Construction is proceeding.


geo

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

Date: 28 Oct 89 01:17:27 GMT
From: hpl-opus!hpnmdla![e-mail]  (Alan Bloom)
Subject: pre-novice seeking equipment advice

Building your own rig is great, but it's not a good idea to depend on
that for your first radio.  I would recommend you buy a good used set
(the old tube units are quite reasonable nowdays).  This way, you can
get on the air and OPERATE while you build.  Later you can sell the
used rig and get most of your money back.  By then you will know
what kind of features/performance you want and can make a wise choice
in selecting new equipment.

Al N1AL
//

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

Date: 27 Oct 89 19:53:21 GMT
From: att!cbnewsc![e-mail]  (Bob Parnass, AJ9S)
Subject: Some new federal frequency allocations

Federal frequency information has been difficult to get since the
entire Government Master File (GMF) was redeclared "classified"
during the last presidential administration.

Now, hobbyists must "piece together" tidbits of information gathered
from all sorts of unclassified sources.

Here are some new federal frequency allocations I read about
in the February 14, 1989 (unclassified) publication:

 "Manual of Regulation and Procedures for Federal Radio
 Frequency Management.  May 1986 Edition.  Revisions for
 January 1989"   PB89-193791



US: all agencies, intermittent wide area transient operations
                       [USA-wide]__________  163.1000____call?     (govt recds)
              "          "                   418.0500____call?     (govt recds)
              "          "                   418.5750____call?     (govt recds)
US: all agencies, common
                       [USA-wide]__________  163.3500____call?     (govt recds)
              "          "                   408.4000____call?     (govt recds)
              "          "                   418.0750____call?     (govt recds)


The paper also lists the frequencies and locations of some
US Government transmitting and receiving earth stations in
the 1761 and 8025 MHz ranges.  These are operated by USAF,
NASA, or Commerce.
--
============================================================================
Bob Parnass, AJ9S - AT&T Bell Laboratories - att!ihuxz!parnass [phone]

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

Date: 26 Oct 89 19:30:21 GMT
From: hpfcso!hpfcbig![e-mail]  (Rick Turley)
Subject: Uniden HR-2510 on CB ?

Does anyone know what conversions are possible for the Uniden HR2510 so
that it can handle 11M (CB) activity as well as its 10M capability?  I
think I saw some note about this many months ago.  I presume that I
have the "potted" electronics vintage rig.

Please e-mail me any info you might have.

Thanks,
Rick Turley / WB2CFK
[e-mail]

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

Date: 26 Oct 89 19:22:12 GMT
From: hpfcso!hpfcbig![e-mail]  (Rick Turley)
Subject: Uniden President HR-2600 - info request

/ hpfcbig:rec.ham-radio / [e-mail] (Goh Kawai) / 11:47 pm  Oct  7, 1989 /
Does anybody have experience with the Uniden President HR-2600
all mode 10 meter mobile rig?  I'm thinking about this one, and
would appreciate any info on this.  Thanks.

>goh< ([e-mail] [arpanet]) n6uok
----------

I don't know about this one but the HR-2510 is a great rig!

Rick Turley

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

Date: 27 Oct 89 14:38:42 GMT
From: asuvax!anasaz![e-mail]  (John Moore)
Subject: Where do YOU buy parts?

In article <[e-mail]> [e-mail] writes:
]Is there some secret to parts acquisition that I have missed?  Do some
]of you know of distributors who are willing to sell to individuals in
]small quantities?  It is frustrating to find the perfect part in a
]data book but not be able to buy it for lack of a source.

I am a part-time manufacturer of repeater controllers (True Value Software
TVS-701). I have accounts with many distributors, and they all allow
me to buy in unit quantities.

If you are buying specialty parts a lot, it may be worth it to set
up an account with them. You may need to set up a business (which
can be simply a business checking account, and a business name
with your name in it so you don't have to file ficticous name
statements). Once you have done that, as far as the distributors are
concerned you are a business and they will sell to you, and even set
up accounts. I set up True Value Software as a business years before
I had any products just so I could do things like that.
--
John Moore (NJ7E)           mcdphx!anasaz!john asuvax!anasaz!john
[phone] (day or eve) long palladium, short petroleum
7525 Clearwater Pkwy, Scottsdale, AZ 85253
The 2nd amendment is about military weapons, NOT JUST hunting weapons!

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

Date: 27 Oct 89 16:22:14 GMT
From: hp-pcd!hplsla![e-mail]  (Tom Bruhns)
Subject: Where do YOU buy parts?

>Though I have catalogs for all of the following:
>
>    All Electronics
>    Amidon Associates
...
>
>I *OFTEN* cannot find the parts I want.  These include linear and
>digital IC's, transistors, hybrids, mixers, etc.  It is frustrating to
>find the perfect part in a data book but not be able to buy it for
>lack of a source.

Another to add to your list:  Active Electronics.  Headquarters is
in Boston area, I believe.  Some places like Active and Newark have
more than is in their catalog; Active tends to cater more to
hobbiests.

MiniCircuits Labs has packaged mixers, MMIC's, and a narrow range
of associated items.  They have minimums, but if you do a lot of
that sort of experimenting, consider their "kits" of assorted
parts.  Lately they have been pushing MMIC kits, and will also
sell you chip capacitors.

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

Date: 27 Oct 89 15:41:30 GMT
From: hpfcso!hpfcmgw![e-mail]  (John Wells)
Subject: Wondering about 455 kHz

/ hpfcmgw:rec.ham-radio / [e-mail] /  3:00 pm  Oct 23, 1989 /

Does anyone out there know how 455 kHz got to be such a popular IF ?
Why 455, (as opposed to 450 or 500, e.g.)?

Just curious.

73 de ka1rcv --- John Paul Braud ([e-mail])
----------

  In the olden days when the first single conversion AM broadcast radios were
designed, 455Khz was chosen because the band width of the AM band was such
that there was little problem with images from within the AM band.  This
allowed manufacturers to build receivers with little or no front end tuning.
(455khz*2 = 910 khz, which is a fair compromise, the "Q" of the tuned RF
section would be sufficient to keep images reasonably down in the noise floor).
  This same engineering mentality holds true for the early FM broadcast
radios, 10.7 mhz was outside the FM broadcast bandwidth, hince little or no
image problem.

            John Wells (supposed to be wisdom of the aincients)
                WA0LHB in Ft. Fun, Coloradio


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

Date: 27 Oct 89 16:21:10 GMT
From: cca.ucsf.edu!pasteur!agate!shelby!polya!Neon.Stanford.EDU![e-mail]  (Marc T. Kaufman)
Subject: Wondering about 455 kHz

In article <[e-mail]> [e-mail] (Kenneth J. Hendrickson) writes:
>[e-mail] (Jim Grubs) writes:
-> > From: [e-mail]
-> > Does anyone out there know how 455 kHz got to be such a popular IF ?
-> > Why 455, (as opposed to 450 or 500, e.g.)?
->So broadcast band images would not fall inside the band.

.Lets see now.  If the LO is above the frequency to be received, and we
.are listing to 540 kHz, the LO must be at 540 + 455 = 995 kHz.
.Therefore the image to be worried about is 995 + 455 = 1450 kHz.  That's
.in the BC band...

.It seems to me that for quite a significant range of frequencies, the
.image _will_ fall inside the AM BC band.  I doubt that's the reason that
.455 was chosen.

For an IF of 455 (as opposed to 450 or 460), the LO will fall *BETWEEN*
stations, rather than on top of them.  This would reduce interference to other
receivers, and would eliminiate images of signals with respect to 2*LO, since
2*LO +/- 455 is not a multiple of 10Kc (we used Kc in those days).

Marc Kaufman ([e-mail])

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End of INFO-HAMS Digest V89 Issue #816
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