QRZ! Ham Radio 3/QRZ Ham Radio Callsign Database - Volume 3.iso/digests/equip/930143.txt

Internet Message Format | 1994-06-04 | 16KB

Date: Thu, 23 Dec 93 04:30:26 PST
From: Ham-Equip Mailing List and Newsgroup <[e-mail]>
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Subject: Ham-Equip Digest V93 #143
To: Ham-Equip


Ham-Equip Digest            Thu, 23 Dec 93       Volume 93 : Issue  143

Today's Topics:
                          ? on ALR 22T Mods
                   AEA DX handy/Mizuho Pico10 & 20
                        DJ-F1T Button Problem
                        Help With Noise Source
                     Icom Tri-band HT (Delta-1a)
                         receiver sensitivity
                        Timewave DSP-9 or 59?
             WANTED: Info or mods for Kenwood TS-50 XCVR
                  Wanted: TM25xxA series accessories

Send Replies or notes for publication to: <[e-mail]>
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Problems you can't solve otherwise to [e-mail].

Archives of past issues of the Ham-Equip Digest are available
(by FTP only) from UCSD.Edu in directory "mailarchives/ham-equip".

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: 15 Dec 1993 15:51:32 GMT
From: yeshua.marcam.com!zip.eecs.umich.edu!umn.edu!uum1!nic.augsburg.edu![e-mail]
Subject: ? on ALR 22T Mods
To: [e-mail]

Have applied wide band mods to Alinco ALR22T two meter transceiver. Now
it appears to have 10 KHZ steps instead of 5 KHZ steps in the vfo and the
tone board doesn't work. Anyone out there with information on this who
could help?

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

Date: Wed, 22 Dec 1993 01:15:12 GMT
From: library.ucla.edu!europa.eng.gtefsd.com!howland.reston.ans.net!spool.mu.edu!umn.edu!news.cs.indiana.edu!nstn.ns.ca!news.ucs.mun.ca!renews.physics.mun.ca![e-mail]
Subject: AEA DX handy/Mizuho Pico10 & 20
To: [e-mail]

  Hello everyone.

 I am looking for maintenance manual or that sort for
AEA DX handy (or Mizuho Pico-10 and Pico-20). Manual
with circuit diagram is also welcome.  I will pay
necessary cost.

  Thank you in advance and wish you merry Cristmas and
happy new year to all.

  VO1/KE7JK-JH3WSA  Hiroshi Matsuura.


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

Date: Tue, 21 Dec 93 14:15:33 GMT
From: tijc02![e-mail]
Subject: DJ-F1T Button Problem
To: [e-mail]

I have an Alinco DJ-F1T. It's been fine for over year, but lately I've had
trouble with the four buttons on the right-hand side. They intermittently
perform each other's function, eg. PO causes scanning or switches from call
to vfo.

Anybody have any ideas as to what I might look for inside?

73, Ed WX4S

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

Date: Tue, 21 Dec 1993 13:27:52 GMT
From: ncar!uchinews!att-out!cbnewsj![e-mail]
Subject: Help With Noise Source
To: [e-mail]

I'm looking for help in tracking down a source of noise.  I've had
pretty good results tracking these things down in the past, but this
one has me stumped.  The noise is really a problem only on 160 meters.
Since I've been operating 160 only in contests, I haven't taken the
time to track this down before now.  With sunspots disappearing as
fast as they are, it's finally time to track down the source and get
rid of it.  I've made the following observations:

1.  The noise is 20db over S9 on my S-meter on 160. (I use an inverted-L
    on this band.)  The noise level falls off rapidly:  around S3 on 80
    and barely noticeable on 15 and 10 meters.  I actually only hear the
    noise on 15 and 10 when the band is very quiet (like at night or early
    morning) and the beam is pointed south.

2.  The noise has a VERY regular pattern:  approximately 3 seconds on
    and 1 second off.  The noise blankers on my TS-940 don't have much
    effect.

3.  The noise is present at all times of the year and at all times of the
    day or night EXCEPT when it is raining or right after it has stopped
    raining.

4.  I've eliminated my house by shutting down all power and listening on
    a battery operated radio -- the noise is still present.  Pointing the
    beam to peak the noise on 15 and 10 meters gives me a general direction.
    The noise is so weak up there, it's hard to get any more that about
    30 degree accuracy, but the nearest house in that direction is about
    1000 feet away.  We have underground utilities in our development.
    The adjacent neighborhood has above ground utilities and is at least
    0.5 miles away in that direction.

Conclusions I've drawn so far:

1.  The noise source is outside (because of the effect of rain).
2.  It's not a thermostat or door bell transformer (the regularity of
    the pattern and the independence of season and temperature).
3.  It's not a power transformer or insulator problem (because of the
    regular pattern).
4.  Because of the high level on 160 and the drop off at higher frequencies,
    it's not very close but must have a fair amount of power (I think
    this eliminates any outside motion detectors that control lights.)

I'd really appreciate any help on identifying the noise source.

Thanks,

Gerry, W1GD

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

Date: 20 Dec 1993 11:26:09 GMT
From: mvb.saic.com!unogate!news.service.uci.edu!usc!howland.reston.ans.net!pipex!sunic!EU.net!sun4nl!tuegate.tue.nl!blade.stack.urc.tue.nl![e-mail]
Subject: Icom Tri-band HT (Delta-1a)
To: [e-mail]

Cyborg ([e-mail]) wrote:
> Does anybody have any information on the new Icom triband HT (Delta-1a)
> I have been looking everywhere but can't seem to find anything on it,
> except little pictures in some of the mail order places...  I may
> write Icom, but I figured I'd get a quiker response from the Net.. :)

Do write icom, you'll get the full coloured handout (sorry, don't know the
right word :). I did it and I received some copies by dealers and icom did
send me the coloured stuff.
By the way, the delta-1a is a nice porto (if I had the money,...). You
should only ask yourself if you need a three band porto, because it's a lot
cheaper to buy a dualbander and build your own transverter. Your choice,...

73 and good luck,

------------------------------------------------------------------------------
Publ: [e-mail]           My .sig is not on request only!
PE1PCP and operator on PI5EHV & PI4TUE           .--. . .---- .--. -.-. .--.
------------------------------------------------------------------------------

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Date: 15 Dec 1993 11:56:48 GMT
From: news.acns.nwu.edu!math.ohio-state.edu!cs.utexas.edu!swrinde!sgiblab!sgigate.sgi.com!olivea!inews.intel.com!ilx018.intel.com!ilx049![e-mail]
Subject: receiver sensitivity
To: [e-mail]

In article <[e-mail]>, [e-mail] (Steve Brown) writes:

|> Generally speaking, the limit to receiving a particular signal on
|> the HF bands is limited by noise, both natural and manmade.  For
|> example, the noise produced by thunderstorms peaks at about 10MHz,
|> if memory serves.  Having a receiver with tiny microvolt sensitivity
|> on the HF bands just gets you more noise.  I will risk all kinds of
|> flames from people who may actually know and say that 2 or 3uV
|> sensitivity on HF would be plenty.

This is indeed the conventional wisdom, and in my experience it's
definitely true IF YOU HAVE A GOOD ANTENNA.  But if you are trying
to listen with a 5-foot piece of wire, then it helps to have more
sensitivity.  Hams are normally transmitting, and thus usually have
"good" antennas.  But for SWL, more sensitivity can be useful.

A related question:  Assume that you have equal amounts of noise
from all directions (isotropic).  Isn't there a limit on the amount
of noise signal that any antenna will receive?  E.g., if you have
a high-gain antenna, will it amplify the noise from one particular direction,
but also tend to ignore noise from other directions, so that the total
amount received stays the same? But on the other hand, won't a just plain
crummy antenna (e.g. a 8-foot whip for 80M) pick up less than the "maximum" amount of noise?

It seems to me that a small antenna could theoretically be 100% efficient
on transmit (if it were made with superconductors), but could not
extract very much signal as a receiving antenna, because it basically
has a very small aperture.

--

-------------------------------------------------------------------
Doug Braun     Intel Israel, Ltd.      M/S: IDC1-41
               Tel: [phone]   [e-mail]

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

Date: Thu, 23 Dec 1993 05:45:29 GMT
From: dog.ee.lbl.gov!newshub.nosc.mil!news![e-mail]
Subject: Timewave DSP-9 or 59?
To: [e-mail]

I'm considering the merits of the features on the Timewave DSP-59 vs
the DSP-9.

Have you any comments about these units?
email to: [e-mail]

Tnx-  Roger,  KD6EFQ
 _ . _     _ . .    _ . . . .    .    . . _ .    _ _ . _         . . . _ . _
 Roger Keating,  Cognitive Engineer PS&E   [e-mail] |  KD6EFQ
 Naval Command, Control and Ocean Surveillance Center  RDTE DIV  | VHF DX is
 NRaD Advanced Afloat System HCI - Code 44209                    |  Fun!
 53245 Patterson Rd,  San Diego CA 92152-7150 USA                | Try it.

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

Date: Mon, 20 Dec 1993 20:53:59 GMT
From: kgw2!toma_pc![e-mail]
Subject: WANTED: Info or mods for Kenwood TS-50 XCVR
To: [e-mail]

Does anyone have any mods or info on the Kenwood TS-50?  I just got one and see
that it has a little connector on the bottom for a computer interface.  Anyone have any
info on what the interface looks like.  Any other neat mods?  (full band, more menu modes ?? ).

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

Date: 15 Dec 1993 13:31:24 GMT
From: news.acns.nwu.edu!math.ohio-state.edu!howland.reston.ans.net!europa.eng.gtefsd.com!news.umbc.edu!haven.umd.edu!cville-srv.wam.umd.edu![e-mail]
Subject: Wanted: TM25xxA series accessories
To: [e-mail]

I am looking for accessories for a Kenwood TM2570A Mobile rig.  I've got two
and need:

One MB-10 mobile mounting bracket
Two TU-7 Tone unit boards
Two Modem Units (MU-1)
MC-48 DTMF hand mics

If anyone has anything laying around...

The mobile bracket is the most urgent need, though.

Thanks,

Scott NF3I


--
73,             _________   _________  The
       \ /  Long   Original
Scott Rosenfeld  Amateur Radio NF3I  Burtonsville, MD  |   Live    $5.00
  WAC-CW/SSB  WAS  DXCC - 119 QSLed on dipoles __________| Dipoles! Antenna!

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

Date: Mon, 20 Dec 1993 18:12:27 GMT
From: pacbell.com!sgiblab!spool.mu.edu!howland.reston.ans.net!xlink.net!subnet.sub.net!rnihd.rni.sub.org!rnivh![e-mail]
To: [e-mail]

References <2eptnd$[e-mail]>, <2eruvk$[e-mail]>, <UqN1u*[e-mail]>n
Subject : Re: TH-78A / TH-78E. What is the difference ?

[e-mail] (Lawrence "The Dreamer" Chen) writes:

>In article <2eruvk$[e-mail]>,  writes:

>> Kenneth E. Harker ([e-mail]) wrote:
>>
>>
>> :       Um, I'm pretty sure that the unmodified UHF TX range is different.
>> : But beyond that, I am not familiar with the Kenwood internal architecture.
>>
>>  Okay. These are the VHF - UHF bands authorized in France :
>>
>>  50.2 to 51.2 with a special authorization.
>>  144 to 146
>>  430 to 440 (shared band)
>>
>In North America the authorized bands are:

>50-54
>144-148
>220-225 (222-225 in US and soon to be Canada)
>420-450 (420-430 is only by special permission) and its a shared band.

>I would guess that the TH-78E only does 144-146 and 430-440 while the TH-78A
>does 144-148 and 440-450.

Yep, you're right.
The A version ist the American version and the E stands for Europe.
The E version does 144-146 MHz and 430-440 MHz without modifications
(I guess there are some secret codes to switch it to the "A"-bands,
but I don't know them).

--
 O  /         ____       _   Torsten Leibold (DG4FEX)
-+-=       | __\_\_o____/_|   Konrad-Adenauer-Allee 105
/ \        <[___\_\_-----<   68519 Viernheim, Germany
           |  o'        ...!subnet.sub.net!rnihd!rnivh!torsten
----------------------------------------------------------------------------

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

Date: Mon, 20 Dec 1993 22:25:38 GMT
From: spool.mu.edu!caen!malgudi.oar.net!witch!ame![e-mail]
To: [e-mail]

References <[e-mail]>, <2efqou$[e-mail]>, <[e-mail]><2f3s2o$[e-mail]>
Reply-To : [e-mail] (Peter S. Loveall)
Subject : Re: Info sought on QUANTUM batt. packs

Matt -
In article <2f3s2o$[e-mail]>, matt roberts ([e-mail]) writes:
>In article <[e-mail]>, Peter S. Loveall <[e-mail]> wrote:
>
>>>I've not seen the Quantum HT batteries, but I have had very positive
>>>experiences with the Quantum batteries for camera flashes. As I
>>>recall, they were high capacity gel cells with charging circuitry etc.
>>>built in to prevent overcharging. (A photographer friend of mine
>>>leaves hers plugged in all the time). Hope this helps.
>
>>I use one for my TH-77A.  It is three years old and still going
>>strong.  It is heavy, but great for portable use and those days
>>when you will be helping with an event all day long.  It also is
>>nice to get the full 5 watts on high power (12v).
>>The comment about the charging circuitry is correct.  These are
>>lead acid batteries and they use an excellent charging circuit on
>>them.
>>
>How do you charge them? Do you need a special power supply or something?
>
>                                       Matt Roberts N3GZM
>
Nope.  Just need a 110v wall socket.  All of charging circuitry is
built in to the battery case and an AC adapter comes with the
battery.
73,
Pete, WB0FEW

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

Date: 23 Dec 93 00:31:40 GMT
From: gsm001!gsm001.mendelson.com![e-mail]
To: [e-mail]

References <[e-mail]>, <2f6vvt$[e-mail]>, <[e-mail]>
Subject : Re: TH-78A / TH-78E. What is the difference ?

In article <[e-mail]> [e-mail] (Alan K Biocca) writes:


   >>In article <2f6vvt$[e-mail]> [e-mail] () writes:

  >>If I intend to go to US this summer, must I buy the CTCSS module ?

>Very few 2 meter repeaters require CTCSS tones, most 440 repeaters do
>require them.  This undoubtedly varies with area.  Many of the
>repeaters that require CTCSS are closed anyway.  You can probably
>get by without them.

It depends on where you are. In the Philadelphia area most of the open
440 repeaters use ctcss and none of the 2m ones do. At least one uses
ctcss for remote inputs.

About 60 miles away in southern New Jersey, all of the 2m and 440
repeaters use ctcss.


Geoff.

--
I used to talk to myself.....  Now that I am a ham, I send code to myself:
-... --- -.--   - .... .. ...  --. ..- -.--   .. ...   .-- . .. .-. -.. .-.-.-

Geoffrey S. Mendelson N3OWJ    [phone]  [e-mail]

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End of Ham-Equip Digest V93 #143
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