I believe this is an issue with the rewritten dsp filtering algorithms in
all the O1 v2 firmware versions. The filter blowby/sidelobe problem ALSO
exists in the main receiver. However, it's masked in the main receiver by
the narrower roofing filters normally used in cw. If you manually select a
wide roofing filter (eg. 20Khz) in the main rx just as an experiment, you
hear the same blowby that's getting past the dsp filtering in the main
receiver as in the subreceiver.
The dsp filtering needs fixing in the O1 v2.
73,
Barry N1EU
On 4/25/07, Barry N1EU <barry.n1eu@gmail.com> wrote:
>
> I'm curious - do any other Orion owners use their subreceiver on cw and
> notice the filter blow-by w v2 firmware, as in high pitched rendering of
> strong UCW signals 2.5-5Khz above their fundamental? I typically use
> 300-400hz selectivity and it's very noticeable. Sidelobes of the dsp
> passband or leakage somewhere in the processing chain? (This WAS previously
> reported to D'nB and is present in v2.059/2.060) This phenomenon
> definitely didn't exist in v1.
>
> 73,
> Barry N1EU
>
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