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Re: [TenTec] [Orion] Orion II Noise Blankers

To: Discussion of Ten-Tec Equipment <tentec@contesting.com>
Subject: Re: [TenTec] [Orion] Orion II Noise Blankers
From: Lin Davis <linbdavis@earthlink.net>
Reply-to: Discussion of Ten-Tec Equipment <tentec@contesting.com>
Date: Sun, 26 Feb 2006 19:12:36 -0500
List-post: <mailto:tentec@contesting.com>
I would absolutely *love* to sit down with the software team and talk about all 
the DSP code modules they used or came up with on their own. For that matter, 
the hardware team too!
So Gary is a good contact man? I'll try to reach him tomorrow. Thanks for the 

Best to you,

Grant Youngman wrote:

>>but I DO still hear a difference. I can only conclude from 
>>this that there is no adaption component to the NR function, 
>>and therefore the NR value is not controlling an adaption 
>>rate, but something else, which sounds to me to be an 
>>amplitude threshold.
> We seem to be talking around each other, but there's no reason to believe NR
> level is controlling some simple threshold. 
> All I can suggest you do is take it up with Gary at T-T for a definitive
> answer straight from the proverbial horses mouth :-)  
> My take on it, based on experience and T-T's own description is that:
> 1.  It's adaptive
> 2.  It builds dynamic filters around signal spectral components
> 3.  Since the filters are dynamic, they are built and rebuilt as the
> apparent spectral components change in the bandpass, at a rate determined by
> the NR setting.  (I'm not saying this is precisely the mechanism, but it is
> the effect of the mechanism.  T-T has not published, that I'm aware of, the
> specific algorithms employed).
> 4.  The closer the signal amplitude gets to the noise level, the longer
> adaption will take -- and in some cases, it may not take at all, in which
> case, turn it off or turn down the THRESHOLD level or turn up the RF gain.
> And if that doesn't work, then turn it off.
> 5.  It's primary function is to improve S/N ratio, not provide a "noise
> free" environment for listening enjoyment :-)
> Note that I am not making statements about how WELL it works, or doesn't.
> Many seem to think it worked better in 1.371 and earlier releases than the
> current realization in 2.xxx.
> Grant/NQ5T
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