[GreenKeys] 1203

Tue Apr 4 12:43:30 EDT 2023

Slight clarification -
plus---fixed_resistor1---rheostat1----TTY1----TTY2----TU1----minus (ground)
plus---fixed_resistor2---rheostat2----TTY3----TTY4----TU2----minus (ground)
etc.
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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>>>
>>> --
>>> Nick England K4NYW
>>> www.navy-radio.com
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>>>
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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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