I have K2 SN 567. I didn't really have a problem with it, but I bought
it used in 2005, had W3FPR look at it then, and install latest mods to
bring it up to date. Today, I thought it might be time to take a look at
alignment, and freshen it up a bit.
When I did the "PLL Ref Osc Range Test" in Alignment Part II, the range
was slightly less than 6 kHz. When I got to "VFO Linearization", 40
meters was fine without any INFO messages.
I was using the original Rev B manual (not related to RevB board) that
came with it. Under Part III, Alignment and Test there is another "VFO
Linearization (All Bands)". I did that and every band failed (INFO 232)
except 40 meters. And of course, in the Rev B manual, there is no INFO
232 only 235. Anyway, I checked around Q19 as the Troubleshooting
suggested and found X1, but no X2. After reading the circuit operation,
I was convinced somehow X2 got left out. Since it was supposed to be
there to prevent the very short range problem I thought I was
experiencing, I thought I had found the problem.
I emailed Elecraft to order X2, and got a nice note from Mike saying
they would send one out no charge. That kind of service still amazes me.
But I told him to hold off until I can hear from this group.
I checked my other K2 manual (I also have SN 6911), and, first, it does
not have a procedure for VFO linearization on anything but 40 meters. In
fact, it says INFO 232 probably occurred because I wasn't on 40m. And
the parts lists says X2 is not used!
I went into this without having any actual problem or complaint. The old
manual convinced me I did. The later Rev I manual says I might, but
didn't know it. I'm supposed to have a PLL range of 9.8 to 15 kHz. I
have 5.97 kHz.
So if that is a problem, the problem is associated with Q19 which is a
very simple stage. X1 is probably the most likely cause. Any ideas?
Also, since two crystals were originally used to "de-Q one another to
increase the tuning range", what was done to make two crystals unnecessary?
Thanks for any help,
Eric KE6US
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