[GreenKeys] polar loops

[Paul Wills]

A picture of the "store bought" version can be found here:

http://www.cedarknolltelephone/cedartel/repeater.htm

Paul Wills

kf9nz at juno.com wrote:
 > I just remembered something about adjusting polar relays!
> Somebody on the RR built a gadget to adjust theses relays.  It had a
> square wave generator of some kind that pulsed the relay, and a zero
> center milliammeter on the contacts.  The idea was to adjust the magnetic
> bias and contact spacing on the relay to keep the needle on center.  It
> was a "home built" device, but  I think it was based on  a commercial
> unit.
> 
> Frankf9nz
>