[GreenKeys] polar loops

[WA5CAB at cs.com]

Frank & Group,

The military test set for adjusting the 255A (and another relay called 
D-164816 that I don't recall ever seeing) is the I-193-(*).  I have an I-193-C here 
but have never used it.

Which brings up a spin-off question.  The 255A has an 8-pin base with 4 pins 
in each of two parallel rows (and 4 guide/retainer pins on a square pattern).  
On the I-193, besides the 255A socket, there is another socket identical to 
the 8-pin one except with 10 pins.  All that the TM says about it is "not 
used".  Anyone ever see a polar relay with a 10-pin base?  There is also an octal 
style socket but with 9 pins.  According to the schematic, it and the 10-pin 
socket are wired the same as the two 8-pin sockets except that pins 8 and 9 go 
to a third winding on the relay under test.

In a message dated 6/17/2004 8:13:51 AM Central Daylight Time, kf9nz at juno.com 
writes: 
>         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.

Robert Downs - Houston
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