[R-390] R390A alignment question

[Les Locklear]

In actuality, the 8 kc filter is 11 kc wide.

Les Locklear
Gulfport, Ms.
Dx'ing since '57


  ----- Original Message ----- 
  From: Tisha Hayes 
  To: r-390 at mailman.qth.net 
  Sent: Saturday, January 09, 2010 1:57 PM
  Subject: Re: [R-390] R390A alignment question


  The stagger tuning is to maintain the bandwidth of the radio when operating
  with a 16 KC bandwidth setting. If you seldom use the 16KC setting like when
  listening to a nice, clean SW or BCB station then you "could" go with a more
  conventional alignment and just peak to 455 Khz.

  The IF gain will be higher with everything across the board at 455 Khz but
  the overall bandwidth will be reduced. The stagger tuning is to give the
  radio a more linear response across the maximum bandwidth.

  If sensitivity and selectivity were your only concern then the tank circuits
  could be changed to eliminate any Q-spoiler components. In a non-perfect
  world the Q would be so high that the radio would have absolutely no
  bandwidth and only be good for listening to CW. So it all depends upon how
  faithful you want to stay to the original design and intent of the radio or
  how much you want to modify it to fit your listening needs.

  I find that the 16 kc bandpass filter is just a bit too broad. I wish they
  had an additional 12 kc setting that would be a better fit for SW/MW
  listening.

  -- 
  Ms. Tisha Hayes

  ----------------
  "I will not recant the truth. I am corn, not chaff; I will not be blown away
  with the wind or burst by the flail. I will survive both."
  -Walter Milne, 1558
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