[Elecraft] Off Frequency K2

[George, W5YR]

Ed, this is one of those situations like the man with two watches - never
knows what time it is.

From your description, it seems equally likely that your counter is in error
and that by adjusting the "4.000 MHz" signal to the value you gave, you were
actually compensating for the counter error and placing the crystal
oscillator on 4.000 MHz.

Not disagreeing with your result - excellent and rare. But, just wanted to
note that ordinarily unless that crystal is set at precisely 4.000 MHz
during CAL PLL, all sorts of calibration deviations can show up.

Glad you resolved the problem, though!   <:}

73/72, George
Amateur Radio W5YR -  the Yellow Rose of Texas
Fairview, TX 30 mi NE of Dallas in Collin county EM13QE
"In the 57th year and it just keeps getting better!"
<mailto:w5yr@att.net>





----- Original Message -----
From: "n5gf" <n5gf@jam.rr.com>
To: <elecraft@mailman.qth.net>
Sent: Friday, April 18, 2003 10:15 AM
Subject: Re: [Elecraft] Off Frequency K2


> Thanks to John KI6WX; Rich Lentz; Steve GU3MBS; Dave K9FZJ; George W5YR;
Ron
> AC7AC and any others who offered the helpful suggestions for my frequency
> readout problem.
>
> With the insight provided by so many, I have been able to "fudge" the
> frequency readout to within 10/20 Hz on both USB and LSB on all bands.
>
> The way I ended up doing it is not scientific but seems to work anyway.
> What I did is try setting the 4.00000 Mhz Oscillator to exactly that
> frequency with my counter.  I then did CAL PLL and found that the readout
> frequency was nearly 500 Hz off from the actual "tuned" frequency of the
> radio.  I then tried adjusting the 4 Mhz freq. to a lower value and found
> that this actually decreased the error after CAL PLL  was run again.  I
then
> readjusted the 4 Mhz freq to an even lower frequency, (3.999870 and found
> that after CAL PLL the frequency was dead on.  I then did CAL FIL to align
> the BFO and filters and voila!  The readout now shows signals on their
> actual transmitted frequency and the transmitter actually transmits on
that
> same frequency.  How remarkable......Very un-technical and un-scientific,
> but who cares as long as the end result is what you wanted.
>
> Proves again that there is more than one way to skin a cat.  Sometimes
even
> the cat won't mind too much.  Hi!
>
> Thanks again to all.
>
> 73  de N5GF  Ed   K2 #3332  On Frequency.