[MRCA] Help with an ARC-4

[Paul Sokoloff]

An amazing thing happened.  I powered it up and it received.  Just having issues with the noise gate (squelch) circuit.  It seems to shut the audio down when the signal is too low (which is normal), but also shuts the audio down as the signal level increases.  I spent the afternoon replacing parts in the circuit and the tube but no change.  Looking at the 10 MHz IF on the plate of the last IF amplifier looks fine.  Does anyone have experience with this radio?  I know it's kind of and oddball one.  I'd like to get the noise gate working or disable it.

Thanks,  Paul  WA3GFZ
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://mailman.qth.net/pipermail/mrca/attachments/20200408/76725043/attachment-0001.html>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: noise.JPG
Type: image/jpeg
Size: 49540 bytes
Desc: not available
URL: <http://mailman.qth.net/pipermail/mrca/attachments/20200408/76725043/attachment-0001.jpe>