[BC] BT-20-A

[Rick Brashear]

Thanks Ron.  I took the old one out and cleaned it up.  In the process I
discovered how it works and what I think was wrong.  It seems there should
be a small spring on the solenoid plunger to assist the mechanism during the
delay portion of the cycle.  I put a rubber band on it as a test and all
worked great!  I'll get the proper spring tomorrow.  It's amazing how much
engineering there is to this relay to achieve an approximate 3 second delay.
All mechanical.  Like you said, there is a small adjustment on the side for
the timing.  Since this is normally used to prevent the transmitter from
being knocked off the air during short power outages like in a thunder storm
I really don't need it for my application.  However, I like keeping things
as original as possible, so I'll adjust it to delay a second or two and
leave it in the circuit.

Thanks again for the info.

Rick


   I don't know the exact relay, but in an odd place there
should be a screwdriver driven adjustment to set the time,
about 3/16" in diameter, a shaft with a slot like a screw
head.
   I was told these are pneumatic, but I never tore one apart,
so that is hearsay.  If so the "rubber" parts may be rotten
or have been torn.  (I have seen lightning do this!)

   These can be replaced with a modern R-C timer relay or you
can make one with a DC relay and capicator/s driven with a DC
power supply.   (big electrolytic)
-- 
    Ron  KA4INM - My Florida property tax is 7 times what it was
                  3 years ago with no change on my part. OUCH!
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