Jim,
You might want to check the PLL Reference Oscillator Range on that K2 -
sometimes called the "R30 voltage".
Don W3FPR
On 7/3/2019 5:24 PM, Jim KO5V wrote:
Don,
Setting each VFO to a frequency within the 15M band cured the "VFO B-A" pop. I checked
the other bands, and found 20M "popping" when changing VFOs. One was set to 14.223, the
other to 14.342. I found a pop as I tuned through ~14.348, so setting that VFO to a frequency lower
that that, cured it. Does the rig effectively tune through the frequencies between the VFOs as it
is switched, so if there are pops, it might see them?
I still hear pops that are louder than I like as I tune from 15M to 12M, and
17M. When going from each of those bands into 15, it is more of a click - like
between 20M and 10M. I guess I can live with that.
Thanks again for your patience. and for sharing your experience.
73, Jim KO5V
-----Original Message-----
From: Don Wilhelm <[email protected]>
Sent: Jul 3, 2019 4:49 PM
To: Jim KO5V <[email protected]>, Elecraft List <[email protected]>
Subject: Re: Fw: Re: K2: "Pop" when switching certain bands
Jim,
There is no relay action when changing from VFO A to B or the other way
around - the MCU just sends different data to the PLL and PLL Reference
Oscillator.
However, 20 MHz may be on the lower limit of the available VFO tuning
range for 15 meters.
Try tuning the VFO for both A and B back into the 15 meter band limits.
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