[TenTec] Corsair II noise blanker

[Ken Brown]

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.