[GreenKeys] 33 current loop

[Jack]

The 32/33 selector magnet driver card can take the 120V loop,
but it unnecessarily heats up the 182630 card (try to find one that
isn't a bit charred on top). Most of the minicomputer applications
provided anywhere from 12 to 30 vdc at 20 ma. and the 33 worked fine.

I'm running my recently-acquired 32ASR with one of the Black Box
CL-50 gadgets and it runs flawlessly. I plug the Black Box RS232 into
a Dovetron Tempest TU and copy ITTY with it.

Jack K0TTY



-----Original Message-----
From: greenkeys-bounces at mailman.qth.net
[mailto:greenkeys-bounces at mailman.qth.net] On Behalf Of
teletypeparts at aol.com
Sent: Friday, December 11, 2009 5:14 PM
To: greenkeys at mailman.qth.net
Subject: [GreenKeys] 33 current loop



33's with a UCC-6 are normally wired for 20 MA full duplex (4  wire).
I 
wasn't aware that it was usually at 24 volts, thanks Jack.   The
computer or 
external device supplies the loop current.  The test set I  use
supplies the 
loop at 120 volts, so I believe anything from 24 to 120 volts  is
fine.  
 
Also, 33's with UCC-6 can be strapped for 60 MA and/or half duplex if

that's what is needed.  
 
The UCC-6 is the common control unit with the Line/Off/ Local switch
on the 
 front.  
 
Wayne
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