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

[Joe Foley]

Its really going to depend on what part of the cams
the rollers are riding on as to which direction is
easier.

Joe




--- Philip B Atchley <ko6bb@juno.com> wrote:
> Hello all.  
> After using the R-390A for a couple weeks to "chase
> beacons" I have
> noticed a tuning peculiarity that I'm wondering is
> 'normal' for the set. 
> 
> 
> First, let me explain what I'm doing.  I'm chasing
> beacons in the
> 200-525kHz longwave range.  I use extremely narrow
> filters with both the
> .1KC Xtal filter and Sharp audio selected, BFO
> offset about 800 Hz. 
> Naturally this requires extremely slow and patient
> tuning to prevent
> overrunning a weak beacon.
> 
> The KC tuning on my receiver is very 'free',
> probably the best R-390A
> I've had in that regard.  BUT, I've noticed that
> when tuning "up" in
> frequency the tuning is easier than when I tune
> "down".  Almost like
> tuning up in frequency is "power assisted".  Common
> sense would tell me
> that, if anything,  it should be the other way
> around as the slug racks
> for the most part are going down as you tune down in
> frequency.
> 
> Has anyone else ever noticed this anomaly?  Cause? 
> Cure?
> 
> 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.
> 
>
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