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Re: [TenTec] Corsair II noise blanker

To: tentec@contesting.com
Subject: Re: [TenTec] Corsair II noise blanker
From: Ken Brown <ken.d.brown@hawaiiantel.net>
Reply-to: Discussion of Ten-Tec Equipment <tentec@contesting.com>
Date: Sun, 30 Mar 2014 07:34:31 -1000
List-post: <tentec@contesting.com">mailto:tentec@contesting.com>
The ANC-4 is not a noise blanker, and it is also not a DSP noise reduction device. As it's model number suggests it is a "noise canceller."
What it really does is use an additional antenna and some phase and 
amplitude controls to make a phased array for receiving only. If the 
offending noise arrives at the two antennas (the main antenna and the 
"noise antenna") with a different phase and amplitude relation than the 
signal you wish to hear, the adjustments can be made to cancel the noise 
and still be able to hear the desired signal. If the noise source 
arrives at the two antennas having the same phase and amplitude relation 
as the desired signal, it will not be able to cancel the noise without 
also cancelling the signal.
It does not "blank" or shut down the whole signal path during noise 
pulses, and it does not do any frequency selective filtering or 
reconstruction of the signal waveform as a DSP unit does.
All of these methods can be helpful.

DE N6KB
On 3/29/2014 1:37 PM, A R wrote:
  But, given the very variable characteristics of my noise, requires fussing 
with (adjusting) the phase and gain of the noise reference in the ANC-4. But 
with a lot of patience in the adjustment, including an effective technique for 
matching amplitude of the reference antenna noise with the main antenna noise, 
it does a very good job. I can reduce 9+20db noise to an S3, without affecting 
signal processing or audio within the radio. But, it does take a LOT of fussing 
with adjustments.
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