[R-390] R-390A tuning question.

[Philip B Atchley]

Barry et al...
The below is true 'IF' you wish to use it in the SSB mode.  In my case
I'm chasing CW signals (actually the sidebands of MCW signals.  So, in
this case using the .1KC selectivity position I want the signal (or
calibrator) Centered in the very narrow IF passband.  Since I want a 800
Hz CW note to make it through the "sharp" audio filter I 'must' have the
BFO offset by 800 Hz, NOT by one half of the filter bandwidth! This will
give me maximum selectivity and maximum audio for a given CW signal.  

73 de Phil  KO6BB
Loving home provided for wayward Boatanchor Receivers.
R-390A '67 EAC.  HALLICRAFTERS SX-71 ('53) & 5R10A ('53).
REALISTIC  DX-160 ('78).  HOMEBREW  Longwave CW receiver.
Merced, Central California, 37.18N  120.29W  CM97sh.

> I'll mention procedures that you may already know, but a lot of 
> people don't
> know this. It is per the manual too.
> 
> I always get AM stations much better using the BFO. I never try for 
> AM
> stations in AM mode unless they are killer signals.
> 
> You mentioned a 800 kc offset. If you are tuning a station with the 
> BFO you
> must use half of the filter setting as an offset in tuning and BFO 
> setting.
> For example, if you are tuning with the 2 kc filter for 350 kc you 
> should
> set the BFO to 1 (either USB or LSB) and then center tune the 
> station. A
> properly aligned radio will show a frequency of 351 kc for USB and 
> the 2 kc
> filter.
> 
> 
> Barry
> 
> 

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