[Elecraft] Anyone using WSJT with a K2?

[Don Wilhelm]

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
>
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