[Boatanchors] Tube radio Product detectors

[Gary Schafer]

The BFO may not be starting. A product detector has little output without
the BFO signal.

73
Gary  K4FMX

> -----Original Message-----
> From: boatanchors-bounces at mailman.qth.net [mailto:boatanchors-
> bounces at mailman.qth.net] On Behalf Of Greg Mijal
> Sent: Saturday, July 10, 2010 8:33 PM
> To: boatanchors at mailman.qth.net
> Cc: milsurplus at mailman.qth.net; testequipment at mailman.qth.net
> Subject: [Boatanchors] Tube radio Product detectors
> 
> Hi:
> 
> I was thinking about something I see here at the repair bench.  Some of
> the receivers and transceivers I work on have something funny going on in
> the product detector.  Turn the radio on, let it warm up and no audio.
> Rock the mode switch to SSB and poof! rig is now receiving normally and
> stays that way for whole time it is used.
> What causes this?  Even my 75S1 does it and now I have a Galaxy
> transceiver with the exact same symptom.
> What's up?
> Tnx
> Greg
> WA7LYO
> Kinston NC
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