[GreenKeys] Model 19 and 15 on 20mA loop?

[hwhall at compuserve.com]

Yep, you're right. It apparently was the holding magnet that could be rewired for either 60 or 20 ma. Also confusing my memory was a reference to the changing the Line current setting which when using the polar relay could be either 60 or 20 ma by changing an resistor connection.
 

 Wayne
WB4OGM

 

-----Original Message-----
From: WA5CAB--- via GreenKeys <greenkeys at mailman.qth.net>
To: greenkeys <greenkeys at mailman.qth.net>
Sent: Tue, Apr 12, 2016 5:17 pm
Subject: Re: [GreenKeys] Model 19 and 15 on 20mA loop?


No.  The selector magnets in the pulling selector are already wired in series.  I was pretty sure that this was the case but I dug out the first Teletype manual I ever owned (nust have been in early 1968 as I had written my two call signs and "ETN" on the front cover) and waaaaay back in the back found the schematic diagram.

Robert Downs - Houston
wa5cab dot com (Web Store)
MVPA 9480

In a message dated 04/12/2016 11:02:50 AM Central Daylight Time, magwheels at comcast.net writes: 

I see here that if you have the holding type selectors the change is easy to make from 60mA to 20mA.  

But could the pulling type magnets also be used at 20mA loop current? 

73

Andy  




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