If you heard the Omni VI rx audio before it goes through the dsp stage and
then on to the audio amp, I'm not sure you would call it very quiet. ALL
audio above 3.4KHz is brick wall, low pass filtered in the dsp. Without
that audio filter, the level of hiss in the Omni VI rx audio is very high.
73, Barry N1EU
On Wed, Nov 5, 2014 at 9:49 AM, Peter Bertini <radioconnection@gmail.com>
wrote:
> Even the Paragon had better synthesizer phase noise spec's than many of the
> imported radios of that era; and by several dB. Not too shabby. I run both
> an Omni VI and Paragon II and I've been pretty happy with both receivers.
>
> But, to digress... LO noise only comes into play when there are strong
> nearby signals which can cause reciprocal mixing, which essential mixes
> the phase noise back into the receiver IF pass band. Ten Tec did a few
> other things right--a very quiet IF, good gain distribution, a low noise
> front end and first mixer, and other good practices that greatly contribute
> to receiver with a very quiet background noise level.
>
> On the other hand, my Ten Tec 1254 SWL receiver, with two MC-1350 chips in
> the IF running full bore, sounds like a Hoover vacuum cleaner!
>
> Pete
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