Communications audio isn't full and robust. It has a limited bandwidth
by the IF filters and proper audio to limit you hearing atmospheric and
circuit noise, hum, and rumble. Adding bandwidth to any of these reduces
the S/N of the desired signal and allows you to filter more atmospheric
and circuit noise and QRM with your ears.
I often use a passive low pass filter on the speaker to reduce filter
leakthrough and audio state high frequency noise outside the IF filter
pass band. One I use is described at:
http://www.geraldj.networkiowa.com/papers/speakerfilter.pdf
Its really handy for cleaning out DSP artifacts.
73, Jerry, K0CQ
On 2/6/2011 8:31 AM, yash@aol.com wrote:
>
> Have been using my ,new to me ,Omni VI+ for a few weeks,like the rig,hard
> to fault for a 10+ year old rig. I have one problem that I would like to
> change. The audio quality. In stock form the rig sounds "nasally" to me
> ,constricted and choppy. I installed the Inrad audio kit ,2 caps and 1
> resister,it made a nice change in the quality of the audio. I noticed that
> INrad also mentions changing the OEM 6 MHz filter with a #755 of their
> design. Has anyone done this filter change? Is there another route to getting
> the audio sounding full and clean with this rig? Other than the audio the VI+
> is great.
> thanks
> dale wt4t
>
>
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