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1994-11-14
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Date: Tue, 21 Jun 94 04:30:31 PDT
From: Ham-Equip Mailing List and Newsgroup <ham-equip@ucsd.edu>
Errors-To: Ham-Equip-Errors@UCSD.Edu
Reply-To: Ham-Equip@UCSD.Edu
Precedence: Bulk
Subject: Ham-Equip Digest V94 #197
To: Ham-Equip
Ham-Equip Digest Tue, 21 Jun 94 Volume 94 : Issue 197
Today's Topics:
Broken ts-530
HELP! Icom 28H
Send Replies or notes for publication to: <Ham-Equip@UCSD.Edu>
Send subscription requests to: <Ham-Equip-REQUEST@UCSD.Edu>
Problems you can't solve otherwise to brian@ucsd.edu.
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: 21 Jun 1994 04:27:59 GMT
From: ihnp4.ucsd.edu!sdd.hp.com!spool.mu.edu!uwm.edu!alpha2.csd.uwm.edu!pachner@network.ucsd.edu
Subject: Broken ts-530
To: ham-equip@ucsd.edu
At the radio club at school, we have a ts-530 (i think it is at least. it
has tube finals with digital vfo). It recieves fine but won't transmit with
mike, code key, tuning mode, or manually closing the contacts. Has anyone else had this
problem?
thanks
tom
--
Thomas Jay Pachner -=- Music Major (at least this week I am)
University of Wisconsin - Milwaukee
pachner@alpha2.csd.uwm.edu - please note new email address
Amateur Radio Call Sign: N9UUJ
------------------------------
Date: Tue, 21 Jun 1994 03:18:53 GMT
From: netcomsv!netcom.com!fmitch@decwrl.dec.com
Subject: HELP! Icom 28H
To: ham-equip@ucsd.edu
hi, mitch, wa4osr here in mobile, alabama...
i have a dead icom 28h... i don't have the manual or schematic...
i would greatly appreciate a copy of the manual, with schematic if
possible, and a service manual would be fabulous... i will be glad
to pay for copying and postage...
thanks,
mitch
wa4osr
* * * I collect telegraph equipment (mostly bugs - Vibroplex) * * *
-------------------------------------------------------------------------------
Email: fmitchell@rd.qms.com or, second choice, fmitch@netcom.com
Felton "Mitch" Mitchell, WA4OSR, 11 Midtwon Park, E., Mobile, AL 36606 USA
205-342-7259 home, 205-476-4100 work, 205-476-0465 FAX
co-sysop for W4IAX bbs running fbb ... sysop for WA4OSR DXCluster in Mobile..
------------------------------------------------------------------------------
--
* * * I collect telegraph equipment (mostly bugs - Vibroplex) * * *
-------------------------------------------------------------------------------
Email: fmitchell@rd.qms.com or, second choice, fmitch@netcom.com
Felton "Mitch" Mitchell, WA4OSR, 11 Midtwon Park, E., Mobile, AL 36606 USA
205-342-7259 home, 205-476-4100 work, 205-476-0465 FAX
co-sysop for W4IAX bbs running fbb ... sysop for WA4OSR DXCluster in Mobile..
------------------------------------------------------------------------------
------------------------------
Date: 21 Jun 94 06:07:33 GMT
From: ihnp4.ucsd.edu!usc!howland.reston.ans.net!vixen.cso.uiuc.edu!newsrelay.iastate.edu!news.iastate.edu!tremplo.gis.iastate.edu!willmore@network.ucsd.edu
To: ham-equip@ucsd.edu
References <2u2h6l$1m0@search01.news.aol.com>, <CrovAy.Mo3@lila.com>, <2u4v8o$41e@agate.berkeley.edu>emplo.g
Subject : Re: (Rechargable) Alkalines vs NiCads?
kennish@kabuki.EECS.Berkeley.EDU (Ken A. Nishimura) writes:
>Bill Dorsey <dorsey@lila.com> wrote:
>>Why is 10-year-old battery technology still being used in state-of-the
>>art HTs?
>It's cheap! Ni-Cds can be bought in quantity for 50 cents per cell.
>Can't come close to that with anything else. Ni-Cds have
>been around for 100 years.
It's not only cheap, but they are fairly rugged--elecronically. Every
fool and their friend and whip up a NiCd charger out of a pair of transistors
and a few resistors which will safely charge NiCd's.
>NiMH cells are expensive, and they are harder to quick charge. They
>also have a horrible shelf charge retention, which makes them tricker
>to use on an occasional basis -- a definite advantage of Renewals.
>Also, the newer NiCds are catching up -- 950 mAH is on its way, which
>is only 25% less than NiMH, for less than 1/2 the cost.
I can't agree more. Early generation NiMH batteries have horrid shelf
properties. Admittedly, most ham's using NiCd's are already used to
plugging in the radio at night anyway. I picked up some 850mA/h NiCd's
at a ham fest for $2.00(US)/each and I didn't look too hard. 600mA/h
cells could be had for half that.
>Lithium ion is even harder to charge -- you need a temperature compensated
>constant voltage charge accurate to within 0.5% to maximize cell life.
>Also, I don't know how the high current discharge characteristics of those
>cells rate. Remember, HT use is very demanding requiring over 1A discharges
>if you're on high power -- a weak point of Renewals.
Exaclty, discharge characteristics are very important to HT users. The
problem is, it is hard to make a blanket decision as performance depends
heavily on usage characteristics. If you have a scanner or a nontransmitting
HT drawing in the 100mA to 20mA range (typical), alkaline (including Renewal)
will perform better than NiCd by a factor of 2x to 3x. If you transmit
on that same HT, you will quickly change this ballance in favor of NiCds.
For example, an E91 (energizer AA) vs a (forgot the exact part) 500 mA/h NiCd,
the tradeoff is at around 150 mA of constant drain. The curve is in favor
of the E91 by a factor of 2x to 3x on the low current side and in favor of
the NiCd by 3x to 5x in the 1A to 1.5A range. (email me for references if
you would like to see them) Keep in mind that this is for a .5A/h NiCd.
>It would be interesting to see when the HT manufactuers offer a NiMH
>pack, and how much they would charge for it.
(sarcasticaly) Considering the price they charge for NiCd's, I don't want to
know...
>>I've been using AA NiMH batteries in the AA-battery pack for my HT
>>for a while now, and have experienced superior performance to regular
>>nickel cadmium batteries without the worry of memory-effect. Now if
>>only I didn't have to take the thing apart every time I want to charge
>>them. I found these at a local battery-specialty store in case anyone's
>>interested.
>I'm glad it's working for you. I have tried some 1200 mAh
>NiMH cells and they do have the extra capacity, and I use them when
>that is the overriding criteria. But I usually stick with el cheapo
>NiCds since they cost almost nothing to replace when they finally poop
>out. I charge them while in the pack. Used two paper clips and some
>copper foil plus solder and made a jig so that I can place the
>pack on the clips and make contact. Add a delta V charger ckt and
>you're home free.
For a charge-every-night HT user, NiMH will win out if that much capacity
is necessary vs the price differential. Keep in mind that charging circuitry
will be more expensive/complex for the NiMH calls.
Since I seem to be the self appointed advocate of 1.5V AA Lithiums, here's
my two cents WRT them:
These cells combine the best of both worlds. (alkaline and Ni-whatever)
They have a low internal resistance like NiCds. They have high capaciy
like alkalines. They have the discharge characteristics of NiCds. Best
of all, they have great low and high temperature performance--better than
both alkaline and Ni-whatever. Finally, they're really light.
Cons: they cost about $6.00(US) for two! (they did just go into volume
production and have, as yet, to catch on) They are primary cells--i.e.
they can't be recharged.
Just thought I'd mention them as they are bound to decrease in price in
the coming years--especialy if hams grow an affinity for them. (hint hint)
Cheers,
David
--
___________________________________________________________________________
willmore@iastate.edu | "Death before dishonor" | "Better dead than greek" |
David Willmore | "Ever noticed how much they look like orchids? Lovely!" |
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End of Ham-Equip Digest V94 #197
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