Don, OK I had to test this again and look at the manual. I "thought" I
tried shift but brain cells are getting old...
I used fldigi to see a nice 0-4K audio spectrum.
I went to 40m (shouldn't matter), set DATA A, set BW=4.0, Adjusted FC
from low to high 1.28 to 1.64 with *1.5.
FC ... If I change it over its full range the lowest it goes is
375HZ (and that may be 10dB down?).
If I change BW=3.0, same but High end varies.
With BW=4.0, only high end varies.
If I make BW=1.7, I can move low end up but not below the ~400HZ...
I have latest firmware, MCU 02.90 DSP 01.52
If I use USB... BW=4.0 FC=*1.5 I have an audio range from 200Hz to
3500Hz ??
I even went back and zeroed my RX EQ.
I guess I can't use DATA A with FT8 in DXpedition Mode.
It won't matter with other modes as only DXpedition mode needs RX at
300Hz...
And I may have been the only one using a KX3 for the test?
*I think the answer is that the problem is not **with me, its firmware
limits...*
The WSJT-X software does other "tricks" to move the TX freq keeping it
within the TX bandpass, 1500Hz +/- 500Hz (it looked like...) Note, not
relative to "issue", just info.
BTW, thanks for all you do for the Elecraft community!
73, Steve WB3LGC
On 3/7/2018 1:42 PM, Don Wilhelm wrote:
Stephen,
In DATA A, use the SHIFT (PBT II) to shift the passband down.
The widest passband is 3000 Hz. which is consistent with your 400 to
3500 Hz observation. I suggest shifting it to 150 to 3150 Hz. It will
work fine for most soundcard data modes.
The K3/K3S has the same behavior, but it is not a problem.
73,
Don W3FPR
On 3/7/2018 11:47 AM, Stephen Shearer wrote:
8. My KX3 with "Data A" has a wide bandpass of 400Hz to 3500Hz and
shifting the RX down was not going to work with the software shift
for the report, I "guess"...
9. I changed my KX3 to USB, removed CMP and RX/TX audio EQ. The
lower RX cut-off would receive the FOX on the assigned freq.
10. I looked at the KX3 manual C5 for a way to set the passband low
end cutoff while in Data A mode. Nothing found. Does the K3s have
the same problem?
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