[GreenKeys] Polar Relays

[w9ddd at tapr.org]

While on this topic, I've been wondering .... Typically one see these used with 10 ma on the bias winding and 20 on the signal winding.  I'm wondering how little current it needed for reliable operation.  Could one use a 10/5 ma combination and still get reliable operation at 60, 75 or 100 wpm?

John, W9DDD


> On Apr 4, 2021, at 3:02 PM, Tom Hunter <n3crk at hotmail.com> wrote:
> 
> Actually I believe the work is "bistable" meaning it is stable in either of two positions.
> 
> I am attaching a picture of the contacts of a 255A. Click on the thumbnail to get the full size photo. This relay is out of adjustment.
> 
> I have a  14 MB pdf the adjustment procedure from the 1971 edition of "The New RTTY Handbook" by Byron Kretzman. But it seems too big to attach.
> 
> 
> Tom   N3CRK
> <255A.JPG>
> ______________________________________________________________
> GreenKeys mailing list
> Home: http://mailman.qth.net/mailman/listinfo/greenkeys
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:GreenKeys at mailman.qth.net
> 
>>>> Jordan Spencer Cunningham's GreenKeys Search Tool: https://teletype.net/gksearch
>>>> 2002-to-present greenkeys archive: http://mailman.qth.net/pipermail/greenkeys/
>>>> 1998-to-2001 greenkeys archive: http://mailman.qth.net/archive/greenkeys/greenkeys.html
>>>> Randy Guttery's 2001-to-2009 GreenKeys Search Tool: http://comcents.com/tty/greenkeyssearch.html
> 
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
> Message delivered to w9ddd at tapr.org