Paul,
With PSK31 (or any of the soundcard digital modes), the normal up to 30 Hz
shift of tones when switching from filter to filter can be bothersome. This
small shift is inherent in the digital control of the K2 VFO and BFO
frequencies, and can be expected.
The 'cure' is not in the K2, but in how you use the PSK31 software, and you
have 2 choices (or you can use both):
1) Set the program control to Lock the transmit frequency after you tune a
signal and before transmitting for the first time. When you switch filters,
you can then click again on th edesired (but now shifted) signal and your
transmit frequency will not be changed.
2) Set the narrow filter first - and use the K2 VFO knob to do your
tuning - i.e. click on 1000 Hz on the waterfall display and lock the
software transmit frequency to this 1000 Hz point, then tune across the
PSK31 band with the K2 VFO and position the desired signal at that 1000 Hz
point. The advantage of this second method is that the narrow filter
improves the signal to noise ratio and keeps nearby strong signals from
activating the receiver AGC - often, in addition, the RF gain may be reduced
too, further reducing the AGC effect from a really strong signal still in
the passband and may allow copy of a weak signal next to a strong one.
I know it is a little more bother, but it works well for me.
73,
Don W3FPR
-Original Message-
I am fairly new to the K2 and have been playing with PSK31 on mine for a
week or so, It works great with the K2 just running 5 watts or so but….
When I use the SSB filter OPT1 I net onto the station I want to work and
they come right back, if I look at the water fall I can see the trace of
their signal
But if I then select a narrow filter (I guess im then using the
CW filters)
I can see a small move in freq of their trace (about 30Hz)
And I need to retune, I understand that in TX mode the SSB filter is used
all the time so I then have a difference between my TX and rx
freq, any one
any ideas what I can do to put this right (other than use the RIT)
I use the RTTY mode so that the compressor is set to 1:1 on psk tx.
Any help would be great
73
Paul
M0BMN
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