[Heath] [Heathkit] SB-401 / SB-303 LMO question

[N4ch at aol.com]

AND.......another way to arrive at the same "zero-beat" USB  and LSB 
frequencies, without moving the cursor when switching sidebands (like  what Drake 
did with the TR-4, etc.) is to have ONE BFO crystal and use separate  
filters for USB/LSB.   More expensive, though.   Think of it  as a receiver with 
passband tuning (with just 2 discrete passbands, though) and  one BFO 
frequency........and ONE fiducial mark above the VFO scale.    When set up 
properly, the Heath scheme works quite well.
 
 
In a message dated 8/3/2016 7:03:18 A.M. Pacific Daylight Time,  
heath at puck.nether.net writes:

 
The BFO frequency shifts  when the sideband is changed and the LMO 
frequency has to change by the same  amount to keep the dial calibration from 
shifting.  In some examples, in  other brands, instead of shifting the VFO 
frequency, there are actually  2-fiducial lines on the dial, 1 for LSB and the 
other for USB.






Glen,  K9STH 


Website:  http://k9sth.net




 
 
  
____________________________________
 From: Robert Myers  <rsmyers at rogers.com>
To: heathkit at yahoogroups.com;  heath at puck.nether.net; 
heathkit at mailman.qth.net 
Sent: Tuesday, August 2, 2016 10:13  PM
Subject: [Heathkit] SB-401 / SB-303 LMO  question


Hi



I have an SB-303 and SB-401  working together as a transceiver in 'locked'
mode with the (same)  operating frequency for both the Rx and Tx controlled
by the Rx.  Can  someone explain to me why the LMO frequency on the SB-303 
is
suppose to  change slightly when moving between USB and LSB, please?  I
thought I  sort of understood this one  time.










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