[R-390] K601

[Rick Brashear]

Hi Roy and all.... thanks for the insight.  I guess I already have the 
squelch function as the label is on the function switch, but it does not 
have an added plate.  It appears to have come from Collins like this.  
Maybe I'm not looking at the right thing.  I have another dilemma.  The 
relay K602 in the sub chassis of the audio module is marked 6 volt DC on 
the coil.  Could it be someone has modified it from the original?  
According to my schematic one side of the coil goes to the plate of the 
squelch amplifier (V601 - pin 1 a 12AU7) and the other side goes to the 
function switch, pin 11, which I believe goes to the calibrated B+ when 
in the agc/etc. position.  I have the module out and it is definitely 
K602 that is chattering.  When I measured it the coil has about 6.7 
volts AC.  This is the relay that is marked 6 volt DC on the coil.  What 
do you guys make of this?  Did a previous owner replace the AC relay 
with a DC relay and when it chattered he just disconnected it?  If so, 
I'm still confused as the coil does not go to the filament supply.

The antenna relay (K101) is grounding the antenna, but it is my 
understanding that it is the break-in relay in conjunction with the 
squelch relay that grounds the audio portion.  I most likely read 
incorrectly.

Thanks,
Rick/K5IZ



> Tim and others,
>
> Tim has it right. The relay operates on the 6.3 volt AC supply. It 
> draws about 40 ma of current, AC.  Presumably, it would work on DC if 
> rewired, but I don't know what voltage/current....