[GreenKeys] Power supply recommendation

[David V. Corbin]

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 at mailman.qth.net <greenkeys-bounces at mailman.qth.net> on behalf of William Wuttke <wcwuttke at gmail.com>
Sent: Thursday, July 27, 2023 2:29:26 PM
To: Windows XD <antech6586856 at gmail.com>
Cc: greenkeys at mailman.qth.net <greenkeys at 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 at gmail.com<mailto:antech6586856 at 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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