[R-390] R390 receive and frequency readout alignment question

Sun, 3 Mar 2002 18:41:53 -0800 (PST)

Chris,

A couple of things. . . .

Sounds like your PTo may have the classic long error, i.e. it may require more
than 10 turns to put out its spec 1000 kcs.

If this is the case your PTO needs this simple endpoint adjustment. Refer to an
online manual (same for the 390A).

For any given calibration point, even with the error you described you can
recalibrate at the nearest 100 kcs point by doing this.

1) place the dial at an even 100 kcs calibration point (like 5000 in your
case).
2) turn BFO to ON
3) crank your zero set knob all the way in
4) turn calibrator to ON
5) rotate the dial until you hear a zero beat.
6) Then CAL OFF, BFO OFF, zero set cranked back out.

Now you should be calibrated for 5000 and nearby freqs, even if your PTO is
long on the endpoint adjustment.

The error you described is very common with PTO aging.  It is actually present
at lower freqs, it just appears to be worse at higher freqs if you calibrate at
a low freq. If you calibrate at 5000, it will be worse at a low freq.  

It can be corrected easily with the endpoint adjustment in the manual.

73 Tom N5OFF   

--- Chris <[email protected]> wrote:
> Hi
> At the moment I have  my radio tuned to 4965 khz here. It's actually
> reading 4967. What I want to know is exactly how I can readjust this
> reading to become accurate above each 500 khz  part of the bands. It
> seems that  after 500 khz  (not just 500 khz on mw band ) and up is
> tuned it  is off by  almost 2 or 3 khz.
>  I don't have a problem with recieving signals all that much  as I  was
> hearing Radio Angola on 4950 clear as a bell tonight.
> Thanks
> Chris
> Dx'ing in Kentucky with a Motorola R390  attached to 50 or so ft
> dipole.
> S#3554
> Contract #14214-PH-51-93
> http://members.tripod.com/~swlchris
> 
> 
> 
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