Thanks for identifying this bug, Darren.
Wayne
N6KR
On Apr 24, 2014, at 11:44 AM, Darren Long darren.l...@mac.com wrote:
Hi,
I understand from the release notes that back in mid-2012, RX and TX EQ
were disabled in DATA-A mode. I'm running with latest stable FW in my
KX3 and I've noted that whilst it is not possible to adjust the RX EQ in
DATA-A mode, whatever RX EQ setting was dialled in in SSB mode still
applies in DATA-A mode, despite the fact that the RX EQ values show as a
flat response.
For example, on the 50MHz band, which is very quiet, giving a flat noise
floor in the audio out, I wound 1.6kHz down to -16dB in SSB mode and
observed the trough in the audio FFT spectrum. I then changed to DATA-A
mode, confirmed that the RX EQ could not be adjusted, and that it showed
a flat response in the rig's interface. Nevertheless, the trough at
1.6kHz remained in the audio output spectrum.
This is repeatable for me, and suggests that the wrong set of EQ
parameters are being used for DATA-A mode.
My other observation is that the audio output seems to drop off at 400Hz
in DATA-A mode with PBT FC of 1.5kHz and 4kHz BW, but the audio output
in SSB mode can go down below 200kHz with appropriate PBT filter
parameters. Is this an anomaly or expected behaviour. It would be nice
to be able to receive more digimode signals at the lower end of the pass
band in DATA-A mode.
Cheers,
Darren, G0HWW
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