[GreenKeys] 1203

Tue Apr 4 14:19:48 EDT 2023

One power supply can power many loops if  it will supply the current.  Just as your 120 volt wall socket if you plug in an adaptor or dropcord.  You just have to limit each loop seperatly to 60 ma.  

Ralph ku4pt

From: greenkeys-bounces at mailman.qth.net [mailto:greenkeys-bounces at mailman.qth.net] On Behalf Of Paul Heller
Sent: Tuesday, April 04, 2023 11:59 AM
To: Nick England
Cc: GreenKeys at mailman.qth.net
Subject: Re: [GreenKeys] 1203

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> 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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