Date: Fri, 18 Feb 94 04:30:02 PST
From: Info-Hams Mailing List and Newsgroup <info-hams@ucsd.edu>
Errors-To: Info-Hams-Errors@UCSD.Edu
Reply-To: Info-Hams@UCSD.Edu
Precedence: Bulk
Subject: Info-Hams Digest V94 #174
To: Info-Hams
Info-Hams Digest Fri, 18 Feb 94 Volume 94 : Issue 174
Today's Topics:
ARRL Letter available via FTP
Base Station Power Supply
DJ-580 UHF receive ragne
Foot race across desert?
FT-530 Firmware Problems (epilogue)
Golf Causes Cancer!
Help wanted
Iambic keyer paddles
Keyboards at testing sessions
QSL info for Cuba
Send Replies or notes for publication to: <Info-Hams@UCSD.Edu>
Send subscription requests to: <Info-Hams-REQUEST@UCSD.Edu>
Problems you can't solve otherwise to brian@ucsd.edu.
Archives of past issues of the Info-Hams Digest are available
(by FTP only) from UCSD.Edu in directory "mailarchives/info-hams".
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: Thu, 17 Feb 1994 13:57:05 GMT
From: ucsnews!sol.ctr.columbia.edu!howland.reston.ans.net!europa.eng.gtefsd.com!library.ucla.edu!csulb.edu!csus.edu!netcom.com!marcbg@network.ucsd.edu
Subject: ARRL Letter available via FTP
To: info-hams@ucsd.edu
As part of an experiment, I am making the ARRL letter, which I have been
posting to this and rec.radio.info, available via anonymous FTP. I plan
to keep a repository of ARRL letters (we'll see how it goes). Future
plans also are for the W5YI letter.
If this proves to work without too much hassle, I'll keep it up.
ftp to: netcom8.netcom.com
/pub/marcbg
Enjoy!
--
================================================
Marc B. Grant Voice Mail: 214-246-1150
marcbg@netcom.com Amateur Radio N5MEI
marcbg@esy.com
================================================
------------------------------
Date: Thu, 17 Feb 94 00:35:15 GMT
From: pacbell.com!amdahl!netcomsv!netcomsv!vitsemi!rob@network.ucsd.edu
Subject: Base Station Power Supply
To: info-hams@ucsd.edu
One of my current projects is to set up a base station for VHF/UHF
using a mobile rig. This means I need a 13.8V power supply that
can supply up to 12 Amperes. I know the supply should not have
too much ripple, but I do not know how much is acceptable.
Initially, I was planning on building/purchasing a 12V/14A supply.
But now I am considering using a deep discharge marine lead-acid
battery that is continuously charged for my power supply. Are
there any safety issues associated with keeping this type of battery
on continuous charge?
Using such a battery has the advantage of being a good emergency
backup. The batteries cost much less than power supplies, so if
the charger is inexpensive, the cost will be about the same.
The 1993 ARRL Radio Amateurs Handbook has a circuit for a 12V
charger. It appears to be suitable for my needs. It appears
to be intended to be used as a charging circuit, but not while the
battery is in use. Is it suitable for continuous operation? I
would expect that the battery would keep ripple quite low.
In addition, I would rather not make my own PC board. The Handbook
does not give a source for the PC boards. Does anyone have any PC
boards for this available?
Advice and suggestions for this project are welcome.
--
-------------------------------------------------------------
Rob Eccles KD6VYW | Disclaimer: The statements made here
rob@vitsemi.com | do not represent my employer.
"Hope for the best, but prepare for the worst." -unknown
------------------------------
Date: 17 Feb 1994 23:23:33 GMT
From: olivea!koriel!news2me.EBay.Sun.COM!jethro.Corp.Sun.COM!maverick!ruentien@uunet.uu.net
Subject: DJ-580 UHF receive ragne
To: info-hams@ucsd.edu
hi, guys:
I recently purchase a ALINCO DJ-580, it is a great radio. The quality of audio is great. I have no complaint about this rig.
I got one question here, the menu stated the receive range for UHF is from 430 to 470 Mhz, but what I found is that I can make it from 400 to 520 Mhz. I didn't make any modification on this rig, I don't know this is misinformed on menu? or .....
Any answer will be appreciated!!
PS. I don't have call-sign yet, just pass the test last week.
------------------------------
Date: Thu, 17 Feb 1994 15:23:37 GMT
From: swrinde!cs.utexas.edu!howland.reston.ans.net!math.ohio-state.edu!news.acns.nwu.edu!raven.alaska.edu!aurora.alaska.edu!nsmca@network.ucsd.edu
Subject: Foot race across desert?
To: info-hams@ucsd.edu
In article <2johsr$r45@garuda.csulb.edu>, byon@beach.csulb.edu (Byon Garrabrant) writes:
> In article <jfhCL86vF.tv@netcom.com>, Jack Hamilton <jfh@netcom.com> wrote:
>>I remember hearing about a foot race somewhere across the desert in
>>Southern California and maybe Nevada. It's run by a police agency as
>>a fundraiser for some charity, I think. They have solicited amateur radio
>>volunteers in the past, but I heard about it only after the event (and I
>>don't remember where).
>>
>>Does anyone have more information about this event?
>>
>
>
> It is called the Challange Cup Relay Race - also know as the Baker to Vegas
> race. It's a 120 mile relay race in 20 legs from Baker, in California,
> through Pahrumph (sp) and on into Vegas. This year it will be held
> on April 8-9. We (Orange County RACES) set up a communications system
> for the use of a few county teams. It is an international event, run
> by police officers. This is all off the top of my head, so I may be off
> a bit, but I gan get you as much info as you would like.
>
> --
> Byon Garrabrant KD6BCH byon@csulb.edu
>
There is one in Alaska or was one, between I believe Fairbanks and Anchorage or
was it Fairbanks and Valdez. It used to be run, but not sure if its doen any
more.. It was run by mostly State Troopers, APD (Anchorage PD), and other
Alaskan Police/Law Officers..
Anyone have any info?
===
Ghost Wheel - nsmca@acad3.alaska.edu
also 1@9714 WWIVnet..
------------------------------
Date: 17 Feb 1994 08:52:39 -0800
From: swrinde!cs.utexas.edu!howland.reston.ans.net!europa.eng.gtefsd.com!library.ucla.edu!csulb.edu!nic-nac.CSU.net!ctp.org!not-for-mail@network.ucsd.edu
Subject: FT-530 Firmware Problems (epilogue)
To: info-hams@ucsd.edu
RGS@gfimda.UUCP (Robert G. Schaffrath) writes:
> This is a post of an item I deposited on Compu$erve's HAMNET forum:
>
> Well I just received my re-repaired FT-530 back today. As I had promised
> earlier, here is the finally summary of what was done and the cost if it
> is out of warranty. Please note that my radio is Lot #16. All FT-530's
> that I have played with suffer from the DTMF code squelch problem:
More questions:
I got my 530 around 5 or 6 months ago. How long is the warranty good
for? I have never tried using the DTMF code squelch. Is this something
I should send my radio back for even though I have never tried it out??
If I have performed the jumper 13 removal, will that invalidate the
warranty??
Steve Adams
sadams@ctp.org
------------------------------
Date: Tue, 15 Feb 1994 16:00:28 GMT
From: microsoft!wingnut!edmitch@uunet.uu.net
Subject: Golf Causes Cancer!
To: info-hams@ucsd.edu
I used to be a general aviation pilot. As a pilot,
I learned very quickly that there are three things
you can find near the end of any runway:
1) A high tension power line, obstructing the
approach course,
2) The local sewage treatment plant,
3) and the municipal golf course.
I wonder if there is a connection between golf courses,
power lines and sewage treatment plants! Maybe this explains
an increase in the cancer death rates of golf course
managers. Then too, maybe they all smoke cigarettes.
Then again, this is all so much conjecture, usually about
large percentile differences in very tiny numbers.
Ed Mitchell
KF7VY@N7FSP.WA.USA
edmitch@aol.com
edmitch@microsoft.com
"The opinions expressed are my own and not necessarily those of my employer."
------------------------------
Date: 17 Feb 94 12:32:46 GMT
From: olivea!sgigate.sgi.com!sgiblab!swrinde!cs.utexas.edu!howland.reston.ans.net!pipex!uknet!comlab.ox.ac.uk!oxuniv!laczik@decwrl.dec.com
Subject: Help wanted
To: info-hams@ucsd.edu
Hi,
I am thinking about getting a Kenwood TS-440S or a Yaesu FT-757GX.
I would be most interested to hear about your experience with either
of them, or even better a comparison between the two.
Also: any alternative suggestions, e.g. how inferior would a TS-140S or
FT-747GX would be?
My main requirement is good RX performance and I also need a computer
interface to store VFO and mode data, and for the remote control
of as many functions as possible.
Many thanks,
John
------------------------------
Date: Thu, 17 Feb 1994 13:16:06 GMT
From: agate!howland.reston.ans.net!news.intercon.com!udel!news.sprintlink.net!nic.hookup.net!hookup!ukma!rsg1.er.usgs.gov!junger@ames.arpa
Subject: Iambic keyer paddles
To: info-hams@ucsd.edu
>I am told that in general, right handed operators use the right paddle
>for the dash while the left paddle is used for the dit. OK no problem
>so far.
>
>Is there a rationale behind this convention?
>
I am left-handed and use a single paddle key set up so that my thumb
does dashes. This habit probably originates from my use of right-handed
bugs back in the 50's and 60's. It does allow me to use any right-handed
ham's keyer without any problems, though.
73's -- John W3GOI
------------------------------
Date: Thu, 17 Feb 1994 14:40:29 GMT
From: swrinde!emory!wa4mei.ping.com!ke4zv!gary@network.ucsd.edu
Subject: Keyboards at testing sessions
To: info-hams@ucsd.edu
In article <2970520692.0.p01258@psilink.com> TJA@Panix.Com writes:
>>
>>Would the VEC's kick me out if I brought a laptop to a code test session or
>>should I wait until my paper speed catches up to my keyboard speed?
>
> I run the VE sessions for our local club here in Stamford, CT
>and using a laptop is perfectly fine in a word processor or editor mode.
>You may just have to show it to them first. If they give you are hard time
>just fly out here and we'll let you use one!
Or bring in your Royal or Smith Corona portable typewriter. Even the FCC
allowed you to copy by mill back in the 1960s.
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: Thu, 17 Feb 1994 15:59:42 GMT
From: ucsnews!sol.ctr.columbia.edu!math.ohio-state.edu!cs.utexas.edu!swrinde!sgiblab!pacbell.com!sjhawk2@network.ucsd.edu
Subject: QSL info for Cuba
To: info-hams@ucsd.edu
Hello,
I would like to know what the best way to QSL to CUBA is?
If anyone has the lastest info please Email me.
Thanks Steve WV6U
------------------------------
Date: Thu, 17 Feb 1994 15:27:28 GMT
From: swrinde!emory!wa4mei.ping.com!ke4zv!gary@network.ucsd.edu
To: info-hams@ucsd.edu
References <1994Feb14.131000.8706@arrl.org>, <1994Feb15.160936.23577@ke4zv.atl.ga.us>, <1994Feb16.173115.8288@arrl.org>
Reply-To : gary@ke4zv.atl.ga.us (Gary Coffman)
Subject : Re: Medium range point-to-point digital links
In article <1994Feb16.173115.8288@arrl.org> jbloom@arrl.org (Jon Bloom (KE3Z)) writes:
>
>To talk about a "power dB" as separate from a "voltage dB" is
>meaningless, *unless* the two voltages you are comparing occur across
>different impedances, which is not the case here. Your statement makes
>no sense.
Yep. I can only plead brain fade on that one. You're exactly correct.
20log(voltage ratio) is exactly the same thing as 10log(power ratio).
It's the power ratio we hear, but it's the voltage ratio we're
looking at in the A/D-D/A conversions. (Actual devices are current
driven, but it amounts to the same thing.)
>So, what's enough SNR, 50 dB or 100 dB? I suggest it's 50 dB. A
>compact disk gives you about 90 dB, and I'd hate to think we need
>better than CD quality on our voice links!
I agree. We strive to achieve CD quality in our broadcast transmission
systems, but we rarely achieve it. We count on the 62 db spl of a quiet
room to mask the defects in transmission on the lower end. Since 110 db
spl is threshold of pain, we only *have* to deliver about 48 db SNR to
satisfy the listener. People using good tight sealing headphones can
hear the noise, but otherwise it's lost in the ambient room noise.
Note that for amateur use, our source is a live mike in an often less
than quiet room. So there's no reason to have greater than 48 db SNR
in our transmission system since the source SNR will be no better than
that.
>Of course, to realize the 50-dB SNR from the 8-bit system, the signals
>have to use all of the available signal range. If you use less, the
>SNR is reduced proportionally, as the signal is closer to the noise
>floor. That probably argues for something on the order of a 12-bit
>converter for "overhead." But with good ALC ahead of the A/D, 8 bits
>might be acceptable.
ALC often makes the problems worse if implemented improperly. What
we want is enough gain to put the source noise at the floor of the
converter, and a gain *reduction* circuit to ride peaks so that we
stay in the converter's range. That'll minimize our system noise.
If the source has a SNR greater than 50 db, 8 bits will compress
it down to 50 db. If the source SNR is worse than 50 db, we can't
make it better by scaling gain in front of the A/D.
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: Thu, 17 Feb 1994 12:28:00 GMT
From: pacbell.com!att-out!cbnewst!kt2q@network.ucsd.edu
To: info-hams@ucsd.edu
References <1994Feb11.001239.2842@ke4zv.atl.ga.us>, <CL1p2x.8s2@news.Hawaii.Edu>, <CL5EDr.3CB@news.Hawaii.Edu>
Subject : Re: Whats it got to do with 40 m QRP?
Looks to me like this thread should be renamed "Copying whole words
on CW" Seems like it has nothing to do with cw QRP.
All you have to do is edit the subject line in your followup....
Rick KT2Q
------------------------------
Date: Thu, 17 Feb 1994 14:31:14 GMT
From: library.ucla.edu!europa.eng.gtefsd.com!emory!wa4mei.ping.com!ke4zv!gary@network.ucsd.edu
To: info-hams@ucsd.edu
References <01H8X21VF1N6ECXSL5@tntech.edu>, <CLAz5v.Iss@news.direct.net>, <fred-mckenzie-160294172009@k4dii.ksc.nasa.gov>
Reply-To : gary@ke4zv.atl.ga.us (Gary Coffman)
Subject : Re: John Ramsey
In article <fred-mckenzie-160294172009@k4dii.ksc.nasa.gov> fred-mckenzie@ksc.nasa.gov (Fred McKenzie) writes:
>In article <CLAz5v.Iss@news.direct.net>, kg7bk@indirect.com (Cecil Moore)
>wrote:
>> John Ramsey and I have never met in person. We have exchanged letters and
>> e-mail and I perceive him to be a friendly, helpful, and assertive
>> businessman who is trying to make a living at his hobby.
>
>Cecil-
>
>Over the years, I have seen John at his booth at several hamfests. He may
>even be at the Orlando Hamfest this coming weekend, if you happen to be in
>the Central Florida area.
>
>My impression is as yours, that he is a reputable person. While his
>products are not in the Kenwood or Icom category, neither are his prices.
>I have a nice solid-state, dual trace, 20 MHz oscilloscope, purchased from
>him several years ago. Except for the nameplate, it is identical to one
>sold by several other companies. However, the other companies charged a
>LOT more for theirs!
Actually his pricing was about in line with other resellers of Goldstar
scopes, and you can get a very much better used Tek 453A for less money.
It's not a ripoff, but it's not that much of a bargain either, even
though he cut the price and threw in a digital meter when I bought one
from him.
>I think the kits he sells are aimed towards people like ourselves, who are
>quite willing to go through the ordeal of de-bugging a kit, for the feeling
>of accomplishment from getting it to work! Unfortunately, we are like
>dinosaurs about to become extinct.
>
>The modern ham seems to think a kit is something you merely plug the parts
>into, like assembling an IBM-clone computer from modules. From that point
>of view, I'll admit that John's kits are not "modern".
Well I wouldn't object if the kits were marketed as random collections
of out of spec parts for a poor design that, if you follow the assembly
instructions exactly, won't meet FCC spectral purity requirements, or
Ramsey advertised sensitivity, selectivity, and power output specs.
Sure you can replace parts, extensively modify the design, and alter
tuneup procedures so that the end product is usable and legal, but
only if you have a spectrum analyzer and a bench full of other equipment,
as well as a good deal of RF experience. Or if you don't care that you're
spraying RF over half the band and keying half a dozen repeaters at once.
If the kit were advertised as a *starting point* for an experienced
builder to develop his own transceiver design, I don't think there'd
be much complaint. But as it stands, it's cheaper, and better, to start
with a piece of surplus gear that at least met FCC specs at one time,
and modify *that* to the amateur band. At least you know up front what
you're getting into.
Perhaps hams have been spoiled by the good repeatable designs of other
kit suppliers such as the defunct Heathkit, or the current kits available
from Down East Microwave and some others, where, if you follow instructions,
you'll get a finished product that, if not exactly high performance, at least
meets published specs and FCC requirements without need of sophisticated test
equipment and extensive experience. There's really no excuse for a design
that allows transmission with an unlocked synthesizer. Nor is there an
excuse for a PA design that emits a spectrum that looks like a comb except
at one razor sharp tuning point. Proper unconditionally stable amplifiers
with fixed component filtering are too easy to design to tolerate the Ramsey
approach of critically tweaked circuits any longer.
Note that I had fun discovering what was wrong with the design and
engineering fixes for it once I realized that there were serious
problems. But I don't think most builders would test their transceiver
with a lab grade spectrum analyzer and realize it had serious problems
that needed fixing. For the ham whose bench only contains a soldering
iron, DVM, and maybe a commercial transceiver, noticing that the Ramsey
kit was grossly out of compliance with FCC requirements wouldn't be
obvious. They'd likely go ahead and use it until a determined band
of T-hunters found them and pinned their coax.
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: Thu, 17 Feb 1994 14:50:55 GMT
From: swrinde!emory!wa4mei.ping.com!ke4zv!gary@network.ucsd.edu
To: info-hams@ucsd.edu
References <2jqi1t$rer@pegasus.cc.ucf.edu>, <2jt93e$ds9@charm.magnus.acs.ohio-state.edu>, <CLC4Dw.10E@oakhill.sps.mot.com>
Reply-To : gary@ke4zv.atl.ga.us (Gary Coffman)
Subject : Re: Nude amateur radio clubs
In article <CLC4Dw.10E@oakhill.sps.mot.com> ben@yosemite.sps.mot.com (Ben Thornton) writes:
>In article <2jt93e$ds9@charm.magnus.acs.ohio-state.edu>,
>>
>>Even the *thought* of receiving a QSL card with a nude picture of the average
>>ham on it is enough to offend me. I mean, seriously, folks. Leaf through
>>any QST of recent (or even ancient) vintage, look at the pictures of the
>>hams and imagine seeing them nude.
>
>So, explain to me just how it is that someone is somehow a different person
>simply because they wear no clothing. The difference is only in the eye
>of the beholder...
Of course, all esthetics are in the eye of the beholder. Aside from it's
utilitarian aspect, decorative clothing is designed to mask the ugly,
not hide the beautiful. And according to the prevailing esthetic, most
hams *need* that decorative covering to avoid offending the eye of the
beholder. A prime rule of society is that one shouldn't do something in
public that frightens the horses.
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 | |
------------------------------
End of Info-Hams Digest V94 #174
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