[GreenKeys] 1203

Tue Apr 4 12:34:51 EDT 2023

 Nope, no diodes or capacitors. No, the loops are not interconnected except
sharing a common negative lead (usually ground). The plus lead of the loop
is isolated via the current limiting resistors. Loop 1 doesn't care whether
Loop 2 is 60ma or 0 ma. The one thing that you can't do is stick a
grounding piece of gear (like a TU) into the middle of a loop, because then
devices downstream in that loop get bypassed..

plus---fixed resistor---rheostat----TTY1----TTY2----TU1----minus (ground)
plus---fixed resistor---rheostat----TTY3----TTY4----TU2----minus (ground)
etc.

Nick England K4NYW
www.navy-radio.com

On Tue, Apr 4, 2023 at 12:04 PM Jeff G <jeffg at junknet.net> wrote:

> 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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>>
>> 2002-to-present greenkeys archive:
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>>
>> 1998-to-2001 greenkeys archive:
>> http://mailman.qth.net/archive/greenkeys/greenkeys.html
>>
>> Randy Guttery's 2001-to-2009 GreenKeys Search Tool:
>> http://comcents.com/tty/greenkeyssearch.html
>>
>>
>> This list hosted by: http://www.qsl.net
>> Please help support this email list: http://www.qsl.net/donate.html
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>>
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>>
>> >>> Jordan Spencer Cunningham's GreenKeys Search Tool:
>> https://teletype.net/gksearch
>> >>> 2002-to-present greenkeys archive:
>> http://mailman.qth.net/pipermail/greenkeys/
>> >>> 1998-to-2001 greenkeys archive:
>> http://mailman.qth.net/archive/greenkeys/greenkeys.html
>> >>> Randy Guttery's 2001-to-2009 GreenKeys Search Tool:
>> http://comcents.com/tty/greenkeyssearch.html
>>
>> This list hosted by: http://www.qsl.net
>> Please help support this email list: http://www.qsl.net/donate.html
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>
>
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