[R-390] Some R-390 questions...please help if you can.

Phil M. pmills7 at comcast.net
Thu Apr 24 15:47:36 EDT 2008


First, this is really a Motorla (non-A) from 1952.  The meters
have what looks like to be an ink stamp on the lower right
corner of the glass that consists of three concentric circles with
a 14 in the center.  The outermost circle is about 1/2 inch in
diameter.  What does this mean?

Through dilligent application of a frequency counter and
a firm wrist turning the bandswitch, I have determined that
the crystal oscillator frequencies do not match with what
the manual shows the bandswitch should be.  While it
appears to be fairly easy to remove the crystal oscillator,
adjust the bandswitch inside, and reinstall it, this will not
necessarily do any good unless the bandswitch in the rf
deck matches the band indicator.  Yes, I know that many
band changes do not cause the rf deck bandswitch to do
anything.  My question is, is there any kind of measurement
that I can make without removing the rf deck to confirm that
the rf deck bandswitch position correctly matches the
front panel indicator?  

thanks,
Phil
W5BVB




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