[GreenKeys] 1203

Tue Apr 4 12:37:11 EDT 2023

Each loop or circuit contains the following jacks:

   - *LPG (looping jacks)* normally closed circuit contact phone jacks. Any
   teletypewriter patched to LPG jack with patch cords is connected in series
   in that particular channel, two or more LPG jacks are provided in each
   channel;
   - *SET (set jacks)* the jacks labeled SET incorporate a
   double-throw-double-pole switch; by inserting a DUMMY PLUG into the SET
   jack, the teletypewriter originally in this channel is disconnected;  by
   inserting a patch cord into the SET jack, the teletypewriter originally
   connected is removed from the circuit and can be patched to any other
   circuit by inserting the patch cord into the LPG jack of the desired
   circuit;
   - *MISC (miscellaneous jack)* these jacks are normally closed contact
   phone jacks identical to the LPG jacks; the MISC jacks are not wired to any
   particular circuit; teletypewriters not normally assigned to a converter or
   other terminal equipment are internally connected to the MISC jacks and are
   then available for patching to any circuit.

*"NOTE: Anyone patching or unpatching circuits from a TTY panel must be
sure to pull the plug from the looping jack (LPG) before removing the other
plug from the SET (machine) jack. Pulling the SET jack first interrupts all
TTY message traffic on that channel. IT ALSO PRODUCES A DANGEROUS DC
VOLTAGE ON THE EXPOSED PLUG!"*
Nick England K4NYW
www.navy-radio.com

On Tue, Apr 4, 2023 at 12:34 PM Nick England <navy.radio at gmail.com> wrote:

> 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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>>>>
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>>>
>>> --
>>> Nick England K4NYW
>>> www.navy-radio.com
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>>>
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>>>
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>>>
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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
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>>> http://comcents.com/tty/greenkeyssearch.html
>>>
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>>
>>
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