[TenTec] Re: Orion Noise Reduction

[Grant Youngman]

It seems less likely that something went west .. or south, that it does 
that perhaps there is some set of conditions (AGC setting for 
example) that is different, or noise characteristics or something else 
that was different that day it seemed to perform so well.

I just spent a while listening to weak signals on the low end of 40 
and playing with bandwidth and NR (AGC on med).  My impressions 
are that as bandwidth is reduced the apparent reduction in 
background noise (which admittendly isn't terribly high this morning) 
decreased as bandwidth decreased.  And in fact the "apparent" 
noise actually seemed to increase somewhat at bandwidths much 
below 500 hz.  At the same time however, the signal itself tended to 
become more distinct (with a slightly harder edge) and come UP out 
of that noise, be louder, and be easier to copy.  Very apparent effect 
which got more pronounced at the narrowest bandwidths

Thinking it might just be a level increase overall, I compared that 
with just increasing the volume level with NR off, but on very weak 
signals there was a striking advantage to signal readability with NR 
on.

Guess I'm going to have to pull one of the audio DSP boxes out of 
storage and see how it behaves in the same circumstance.

Grant/NQ5T


> Thanks to W7SV, KE4WY and NQ5T who sent the v1.337 Orion 
update file. > I loaded it into my Orion, but the NR acted the same 
as when the newer > update files were loaded.  I'm at a loss as to 
why the NR seemed to > work so well on CW when I first tried it.  
Either something went west > with my Orion's NR on CW or its an 
inherent problem in all Orions. > > Hopefully Ten-Tec can solve the 
problem in a future update. > > 73, de Earl, K6SE > 
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