[R-390] R-392 calibrator

Wed, 5 Nov 2003 07:03:21 -0500

I have a "quirky" 390a that apparetly has some oscillator leakage somewhere.
With the BFO off and the calibrator ON, I do hear a faint but definite beat
note (sounds like about 500 Hz) under the calibator signal.  Probably
leakage from one of the other oscillators mixing in the front end or IF.
It's not normal, but does happen on this particular 390 I have.
----- Original Message ----- 
From: "WF2U" <[email protected]>
To: <[email protected]>
Sent: Wednesday, November 05, 2003 6:56 AM
Subject: RE: [R-390] R-392 calibrator


> The calibrator generates an unmodulated carries (CW) therefore you're only
> going to hear a tone when the BFO is on, or when there is a signal
present,
> coinciding with the calibrator frequency and heterodyning with it,
> effectively acting as a BFO.
>
> 73, Meir WF2U
> South Carolina
>
> -----Original Message-----
> From: [email protected] [mailto:[email protected]]On
> Behalf Of Paul H. Anderson
> Sent: Tuesday, November 04, 2003 10:47 PM
> To: [email protected]
> Subject: [R-390] R-392 calibrator
>
>
> I'm working on an R-392 where the calibrator puts out a carrier wave that
> I can use the BFO to find at every 100KC, but with the BFO off, I hear no
> audio tone.  What part of the circuit is supposed to generate the approx
> 1kc tone?  I've heard this calibrator tone before on other R-392's.
>
> Thanks,
>
> Paul
>
> _______________________________________________
> R-390 mailing list
> [email protected]
> http://mailman.qth.net/mailman/listinfo/r-390
>
> _______________________________________________
> R-390 mailing list
> [email protected]
> http://mailman.qth.net/mailman/listinfo/r-390