Yes, there's a 2.4KHz roofing filter that kicks in at 2.40KHz bandwidth but
it should be a seamless transition in terms of audio balance. It is on my
566. No, there's no center frequency adjustment that I know of on the
2.4KHz filter.
If you have the 1.8KHz filter installed, is there another abrupt transition
in audio balance between 1.81KHz and 1.80KHz bandwidth when it transitions
from the 2.4KHz filter to the 1.8KHz filter? This transition is also
normally seamless.
73, Barry N1EU
On Tue, Mar 25, 2014 at 7:31 PM, John Huffman <hjohnc@gmail.com> wrote:
> All -
>
> I have a question on my Orion 2 - 566.
>
> There seems to be a receive filter shift between an SSB bandwidth of 2.4
> kHz and less and 2.410 kHz and more. This happens on both upper and lower
> sideband.
>
> At 2.4 kHz the sound of SSB signals has more bass. At 2.410 kHz and
> higher there is less bass. I can get the bandwidths of 2.410 and higher to
> sound the same as the lower bandwidths by adjusting the Pass Band Tuning to
> - 200 hz.
>
> Is there a filter in the receive path at 2.4kHz? Can it, or the next
> wider filter, be tuned or adjusted?
>
> I have never experienced this on my Orion (1) - 565.
>
> 73 de K1ESE
> John
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