[600MRG] GW4ALG Nosie Canceller (was Re: QEX Noise Canceller)

[Warren K2ORS]

See Steve GW4ALG noise canceller:
http://www.alg.myzen.co.uk/radio/136/noise_can.htm

73 Warren

On 3/30/2015 3:18 PM, Brian Pease wrote:
> One of the 2 antennas must have a better s/n than the other, otherwise
> the desired signal will be cancelled out with the noise. Using an
> identical "noise" antenna helps keep the noise waveform the same for
> better cancellation.
>
> On 3/30/2015 2:59 PM, Kenneth G. Gordon wrote:
>> On 30 Mar 2015 at 17:59, Marshall Cross wrote:
>>
>>> Then why not use the same antenna with a splitter?
>> Hmmm....that makes sense...sort of....to me, but I am most certainly
>> not an
>> expert on such things either. Perhaps some separation between the
>> antennas, even if small, is needed in order to achieve a necessary phase
>> difference. I may ask Mike about it.
>>
>> BTW, I was wrong on the value of the reduction in noise level that Mike
>> achieved with his unit: instead of a 25 dB reduction in noise, it was
>> actually
>> a measured 31 dB reduction in noise.
>>
>> I thought that was.....adequate... ;-(
>>

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