PLL Control Voltage Range

[Kenneth Moorman]

I have been having some flakey operation with the main receiver in SN 1292
recently which I believe I have cured for the moment by re-calibrating the
main VCO.  As suggested in the manual, I have been observing the PLL control
voltages on the VFO B display.  Depending on the band, it is varying from a
low of about 1.5 volts to about 5.1 volts.  I also notice that there is
sometime a rather large difference between the PLL1 and PLL2 control
voltages (about 2 volts) on a given band, but not in all cases.  These
voltages do not change much over several tens of KHz tuning on any given
band.  Do these values and actions sound reasonable?   I don't recall seeing
a table of acceptable PLL 1/2 control voltage ranges by band. Thanks for any
insight,

Ken, NU4I

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[John Lemay]

Ken

I can only comment on my own K3 which does not have a second receiver.
Variations from 1.5 to 5v are entirely normal - you are observing the
voltage on the voltage controlled oscillator. You will see it change
gradually as you tune across a band, and then jump as you step to another
band (these are the bands covered by the VCO which are not the same as
amateur or broadcast bands).

Without a second rx, my PLL2 always shows 0.0. Common sense tells me that
PLL2 in your case should be similar but not necessarily the same.

Regards

John G4ZTR

-----Original Message-----
From: [hidden email]
[mailto:[hidden email]] On Behalf Of Kenneth Moorman
Sent: 28 March 2011 15:45
To: [hidden email]
Subject: [Elecraft] PLL Control Voltage Range

I have been having some flakey operation with the main receiver in SN 1292
recently which I believe I have cured for the moment by re-calibrating the
main VCO.  As suggested in the manual, I have been observing the PLL control
voltages on the VFO B display.  Depending on the band, it is varying from a
low of about 1.5 volts to about 5.1 volts.  I also notice that there is
sometime a rather large difference between the PLL1 and PLL2 control
voltages (about 2 volts) on a given band, but not in all cases.  These
voltages do not change much over several tens of KHz tuning on any given
band.  Do these values and actions sound reasonable?   I don't recall seeing
a table of acceptable PLL 1/2 control voltage ranges by band. Thanks for any
insight,

Ken, NU4I

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