[GreenKeys] 1203

[Jeff G]

If I'm not mistaken, they have diodes and resistors (and maybe caps) in
line to isolate each loop channel. In working at the ship with 24 loop
panels I wondered the same thing, although in those cases it seems most of
the loops/panels are a mix of loops and just straight equipment jacks.

Jeff

On Tue, Apr 4, 2023 at 11:59 AM Paul Heller <paul0926 at comcast.net> wrote:

> I’ve always wondered how one power source could supply six loops. Don’t
> they each need a dedicated loop supply? Or are all six channels joined
> together into one loop?
>
>
> Paul
> W2TTY
>
> On Apr 4, 2023, at 3:31 PM, Nick England <navy.radio at gmail.com> wrote:
>
> 
> NO built-in supply. Normal use is to attach a supply to two terminals.
> That powers six separate loops, each with fixed current limiting resistor,
> rheostat, and jacks.
> IF you want to power a loop from a separate supply (like built-in to a
> Dovetron), there are jumpers to change the source. If that separate supply
> already has current limiting, then you should jumper the 1203’s fixed
> resistor for that loop, as Tom said.
> This is an excellent device to connect all your equipment together with
> lots of flexibility.
> The manual is here
> https://www.navy-radio.com/rtty/sb1203.htm
>
> The “extension” on top is just a cover for cable exit if wanted.
>
> Cheers
> Nick
>
> On Tue, Apr 4, 2023 at 8:19 AM W2HX <w2hx at w2hx.com> wrote:
>
>> Tom, are you saying the 1203 has a built-in loop supply (local power)? I
>> noticed in RH’s pictures that one was taller than the other. What is the
>> difference between them?
>>
>>
>>
>>
>>
>> 73 Eugene W2HX
>>
>> Subscribe to my Youtube Channel: https://www.youtube.com/@w2hx/videos
>>
>>
>>
>>
>>
>>
>>
>> *From:* greenkeys-bounces at mailman.qth.net <
>> greenkeys-bounces at mailman.qth.net> *On Behalf Of *Tom Hunter
>> *Sent:* Tuesday, April 4, 2023 12:45 AM
>> *To:* GreenKeys at mailman.qth.net
>> *Subject:* [GreenKeys] 1203
>>
>>
>>
>> For anyone who buys a 1203 from R.H. Goff make sure to download the book
>> from navyradio. It is a small book but it is essential.
>>
>>
>>
>> Even with the book it took me nearly a week to install my 1210 and work
>> the bugs out.
>>
>>
>>
>> Now I like it very much.  I have loops 1, 2 and 3 wired for remote power
>> from three terminal units with built-in loop supplies. 4, 5 and 6 use local
>> loop power. I plan to key two of those with relays, I have a 120 VDC power
>> supply that is capable of running those three loops with ease.
>>
>>
>>
>> I always keep one locally powered loop free for testing individual
>> Teletypes,
>>
>>
>>
>> For remotely powered loops be sure to short the appropriate fixed
>> wirewound  resistors. The remotely powered loops must be wired the reverse
>> of the locally powered ones to have the meter read  to the right on all
>> loops.
>>
>>
>>
>> I wired my Teletypes to the "set" jacks. The abiIity to patch is amazing.
>> I also chose to wire my "misc" jacks into each vertical loop to give me an
>> extra patch point. I have two excellent external meters that I patch there,
>> so I can meter three loops at once. They also show me that the meter on the
>> my 1210 is not very accurate. It reads low.
>>
>>
>>
>> Test each loop as you wire it. Then kill all loop supplies as you wire
>> the next Loop.
>>
>>
>>
>> A few Tips learned the hard way!
>>
>>
>>
>> Tom N3CRK
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>
> --
> Nick England K4NYW
> www.navy-radio.com
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>
> >>> Jordan Spencer Cunningham's GreenKeys Search Tool:
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> >>> 2002-to-present greenkeys archive:
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> >>> 1998-to-2001 greenkeys archive:
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>
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