Just curious. Current loop

Is fixed current (or open) so the need for voltage is dependent on the loop resistance as per Ohms law… so given that most modern installs are “short loop” (ie often in the same room), why the need for something that can supply that much voltage?????

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From: greenkeys-bounces@mailman.qth.net <greenkeys-bounces@mailman.qth.net> on behalf of William Wuttke <wcwuttke@gmail.com>
Sent: Thursday, July 27, 2023 2:29:26 PM
To: Windows XD <antech6586856@gmail.com>
Cc: greenkeys@mailman.qth.net <greenkeys@mailman.qth.net>
Subject: Re: [GreenKeys] Power supply recommendation

 

I would recommend picking up a TU. You will probably want to print ITTY at the very least. Most TU's have an internal 60 ma loop supply except for the HAL ST-8000 and 8000A. Keep checking eBay. Some can be had very reasonably.

73,

Bill

KE3BK

On Thu, Jul 27, 2023 at 11:17 AM Windows XD <antech6586856@gmail.com> wrote:

I’m very new to teletypes, and I want to get my model 19 running. I’ve done the hard part of cleaning, but now I need a 120VDC 60MA power supply. Is there any that you would recommend? ______________________________________________________________
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