Came home from FL to find the K9AY
loop rather sick – intermittent control and not much front to back.
Opened it up today – glad I had the bulkhead
connections at the house all pulled, as the storm that came through early this
month got the loop pretty good. The 470
ohm 2W carbon balance resistor now reads 1100 ohms but looks okay. The Heavy MOVs from
both control lines to ground were blown open.
One of the snubber diodes across one relay
coil is also open. The ferrite binocular
core transformer has multiple cracks and is being held together by the
windings.
This is all easy to fix – an hours work. It’s worth checking your box now and
then! In the store-bought K9AYs they use
either ¼ or 1/8 watts balancing resistors – even more prone to getting
zapped by a nearby strike. I see no
evidence of a direct hit around here – just lots of ground currents
flowing.
N4GG