K3 chirp

Posted by Poul Erik Karlshøj (PKA) on
URL: http://elecraft.85.s1.nabble.com/K3-chirp-tp4597706.html

Just to close this subject maybe.

In addition to the chirp I found on my K3 on 3526 kHz I was told by others (Bruce N1LN) that they had found chirp on 14030.5 kHz. Bruce cured it by adding a resistor+capacitor to the Synth Board and load a specific f/w file and Bruce praises the support from Elecraft!

I checked mine, and indeed I also found chirp in a 400 Hz range around 14030.6 kHz. It was even worse than the 80m chirp and over a much wider bandwidth - it sounded real bad.

I then first soldered in a 55 ohm resistor on the KSYN3 board across R20 (as I was originally told to try by Gary). It took away the chirp on 80m but did not improve much on 20m.

I then received the specific f/w file hfpf0108.hex from Elecraft and also the suggestion to solder in a resistor + capacitor combo to terminate the xtal filter on KSYN3. I decided to try the f/w upgrade first without this termination, since I was not too happy with soldering on the KSYN3 board. I placed the hex-file in the directory with the (latest) firmware files and loaded all new files into the K3 and ran the VCO MD Cal. This eliminated the 20m chirp problem.

I have not yet checked every band and every frequency - which requires about 6000 measurements where you have to tune both the K3 and a separate rcvr ;-)

The solution of this problem gives me good reason to also praise Elecraft support!

73/OZ4UN
Poul-Erik
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