[R-390] Motorola R-390A w/ SW RF deck

[Larry H]

Hi Russ,  Could be the tuning of the output of the 1st mixer, the 1st var IF.  If the frequency of the 1st osc is off more than 2 kc or the alignment of 1st mixer is very far off, this is what you will see.  At this point, I don't think you can rely on the calibrator for alignment.  You need to inject a known frequency.
Regards, Larry

      From: "wb3fau55 at neo.rr.com" <wb3fau55 at neo.rr.com>
 To: R-390 at mailman.qth.net 
 Sent: Sunday, August 7, 2016 12:27 PM
 Subject: [R-390] Motorola R-390A w/ SW RF deck
   
Larry and others-
  yes, I did check for plate and screen voltage at  1st osc.  it is there  when @ 7mc, and switches off when going to 8mc.  
  When you connect a wire ant.  to this,  you get a lot of increase in background noise, when on 8mc.  No change  when on 7mc.  No static when connecting antenna at 7mc.
  No reception at all below 8mc.  I can hear a calibration signal [100kc],  but it is  way low  on 7mc.  
  I would like to build an extender  cable  for the RF section,  but I need the female harness connector.  Anyone  have one  they  can part with?  
  I suspect an input  short  only on the lower bands?  73s Russ.  thanks  guys
  
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