[Elecraft] KX3 - RX EQ in DATA-A mode

[Wayne Burdick]

Thanks for identifying this bug, Darren.

Wayne
N6KR

On Apr 24, 2014, at 11:44 AM, Darren Long <darren.long at 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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