Trouble with PLL Cal K2 #5061

[M. P. Haynes]

Hi Folks,

I've made quite a bit of progress with #5061 but have hit a snag on the
PLL calibration.  I have the frequency probe in TP1 as directed but get
error 232 whenever I try to cal the PLL. Here is my sequence of events
and results:

Select 40 meters; select cal pll; screen momentarily flashes  10625.26;
MSG INFO 232

I tried stepping through the various bands and got the following results:

Select 80 meters; select cal pll, screen momentarily flashes 7482.35, MSG
INFO 232
Select 30 meters,    "       "   "       "              "              "
     12590.52  "          "        "
Select 20 meters,    "       "    "       "              "              "
      15134.75  "          "        "

Similar results on the rest of the bands.

I can hear relays latch with each band change.  Any thoughts on where to
look?  I/O Controller?

Thanks,

Pat Haynes-K4BEH
241 Hunter's Ridge
Jasper, GA 30143
[phone] Home Phone
[phone] Cell Phone
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[Don Wilhelm-3]

Pat,

The frequency is the problem - the microprocessor is waiting to see a
frequency near 12100 kHz.

Go back and check the PLL range to see if the frequency is correct at the
high end of the range.
If PLL high is OK, then look carefully at the capacitors in the VFO Range
Select area are correct and that all the varactors are correct and correctly
oriented.  Recheck the voltages at the left end of R30 to be certain all
band edges are within range.

If you have everything correct, you can check the frequency of the VFO when
tuned to 7000 kHz, use CAL FCTR with the probe in TP1 and you should see
something close to 11915 kHz.  If you have that frequency, then CAL PLL
should run fine.

>From your chart, it would seem that your VFO frequency is too low for all
bands, and that must be corrected first.  If you do the above checks and
find the frequency is still off, send another note and we will try to help,
but it may take some detailed analysis of the VFO and the drive from the PLL
synthesizer.

73,
Don W3FPR

> -----Original Message-----
>
> I've made quite a bit of progress with #5061 but have hit a snag on the
> PLL calibration.  I have the frequency probe in TP1 as directed but get
> error 232 whenever I try to cal the PLL. Here is my sequence of events
> and results:
>
> Select 40 meters; select cal pll; screen momentarily flashes  10625.26;
> MSG INFO 232
>
> I tried stepping through the various bands and got the following results:
>
> Select 80 meters; select cal pll, screen momentarily flashes 7482.35, MSG
> INFO 232
> Select 30 meters,    "       "   "       "              "              "
>      12590.52  "          "        "
> Select 20 meters,    "       "    "       "              "              "
>       15134.75  "          "        "
>
> Similar results on the rest of the bands.
>
> I can hear relays latch with each band change.  Any thoughts on where to
> look?  I/O Controller?
>
> Thanks,
>
> Pat Haynes-K4BEH
> 241 Hunter's Ridge
> Jasper, GA 30143
> [phone] Home Phone
> [phone] Cell Phone
> _______________________________________________
> Elecraft mailing list
> Post to: [hidden email]
> You must be a subscriber to post to the list.
> Subscriber Info (Addr. Change, sub, unsub etc.):
>  http://mailman.qth.net/mailman/listinfo/elecraft
>
> Help: http://mailman.qth.net/subscribers.htm
> Elecraft web page: http://www.elecraft.com
>
>
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>

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