[R-390] Oscillation Spurs

[Patrick Nelson]

Hello Roger,

I happen to have the RF deck out right now checking resistor values and looking for bad caps (that can be checked in circuit).

Like I said, the R-390 is working, but not great.  Unfortunately I found the cathode resistor for the 1st RF amp is reading

about 250 ohms instead of 100.  I'm sure this isn't helping sensitivity any.  Unfortunately it is also buried under half a dozen

other components as well as the band switch.  Not sure what I'm going to do about that at the moment.

 

I like the idea of using signal substitution to find the stage generating the spurious signal.  Was thinking of doing that with the

oscillators, but didn't think of injecting it as the mixer outputs.  Anyway, this receiver is looking to be a big project even

though it was already "working" :-)

I'll keep you up to date...

Thanks,

-Patrick Nelson
 		 	   		  
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