And to think i put the INRAD 2.1 khz filter in the OEM Y2 filter slot in
the 9 mhz i.f. and love it.
Paul (N6MYA)
On Mon, 2008-03-17 at 20:01 -0400, Paul Christensen wrote:
> > Our club's Omni6+ option3 sounds very different on USB and LSB, and it's
> > not possible to correct it by adjusting the BFO frequencies, so it must be
> > down to the filter being asymetrical. I understood that was a common
> > failing, but perhaps our filter is faulty?
>
> As is I recall, my Omni Six resulted in upward passband shift in USB, which
> result in "thinner' audio with less low-end audio content. To localize it
> to the filter, bypass the 2.4K filter with a wire will and the likely result
> is audio that is equal in response on both USB and LSB.
>
> The INRAD 2.8K filter in the 2.4k @ 9MHz slot will result in better SSB
> symmetry between LSB and USB, and may in fact clean up the transmitted CW
> since the CW TX BFO frequency is shifted further away from the knee of the
> filter. The introduction of the INRAD 2.8K filter was a joint effort
> between myself and W2VJN to assist with the Omni Six's transmitted CW issue.
> The secondary benefit was better SSB audio quality.
>
> Paul, W9AC
>
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