Has anyone on the list used WSJT FSK441 mode with a K2? If so I'd like
to hear about your experience.
I've tried it with a XV-50 that I recently built and so far have just
limited success. I have decoded about 2-3 transmissions (plus another
2-4 partials) over 3 Saturday morning "random hour" WSJT meteor scatter
sessions on 6 meters, but so far no successful qsos. I operated with
the K2 set for agc off, usb, and filter OPT1.
My K2 is sn 1520 and was updated to the the most recent firmware at the
same time as the XV50 build in order to accommodate the XV50 and the
KIO2 which also had to be added to the K2 for 6 meter operation.
According to the wsjt manual FSK441 uses 882, 1323 1764 and 2205 Hz
tones in its encoding. My K2's OPT1 filter has the 2205 Hz tone on the
IF filters shoulder. By eye its about 3-4 db below the passband. (In a
previous version of this email I attached a jpg of the spectrogram plot,
but evidently emails with attachments are not permitted here. I can send
you a copy directly if it would help).
Is it possible there is too much attenuation or phase distortion of the
2205 Hz signaling element for easy WSJT operation? I have the OPT1
filter adjusted for the best sounding ssb voice signal (according to my
xyl's careful listening). If it's necessary to move the filter up
150-200 Hz for WSJT, it will affect how my voice comes across in ssb.
What are my best options for good both ssb and wsjt operation with the
K2? Are compromises required here or is there a way to get both good SSB
and good WSJT?
Thanks in advance.
73,
Lenny W2BVH
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