Lenny,
You have the 2.1 kHz filter width installed, and when the BFOs are
properly adjusted, the high frequency corner of the passband will be
close to 2300 Hz.
Order the SSBCAPKT from Elecraft and change the SSB filter width to 2.4
kHz, or even 2.6 kHz.
While you are at it (if you have not already done so), changing the
filter crystals on both the KSB2 board and the K2 RF board will give you
a much better filter - the crystals used in K2 below SN 2560 were not
controlled for motional inductance, and the new crystals are much better.
73,
Don W3FPR
w2bvh wrote:
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
_______________________________________________
Elecraft mailing list
Post to: [email protected]
You must be a subscriber to post to the list.
Subscriber Info (Addr. Change, sub, unsub etc.):
http://mailman.qth.net/mailman/listinfo/elecraft
Help: http://mailman.qth.net/subscribers.htm
Elecraft web page: http://www.elecraft.com
_______________________________________________
Elecraft mailing list
Post to: [email protected]
You must be a subscriber to post to the list.
Subscriber Info (Addr. Change, sub, unsub etc.):
http://mailman.qth.net/mailman/listinfo/elecraft
Help: http://mailman.qth.net/subscribers.htm
Elecraft web page: http://www.elecraft.com
