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

[drlegendre .]

While this is being discussed, could someone comment on the 20/60mA
'conversion' for the keyboard on later M15 units?

As I understand, it's related to the need for sufficient current to keep
the KB contacts clean? Or possibly to prevent over-current of the contacts?
Can't recall at the moment.

On Tue, Apr 12, 2016 at 6:55 PM, <hwhall at compuserve.com> wrote:

> 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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