[Elecraft] K3S Noise reduction Test

[brian]

Had an ANC noise canceller like this. MFJ makes one too.  Same idea. 
Collins also had such a thing for their mobile way back when using a 
separate whip on the back of the vehicle.

They work well but only for one signal source at a time.  If you have 
two noise sources located differently, you can cancel only one.

There was also the nastiness of blowing up the inputs of these units 
when operating high power.  Some way of isolating the circuitry or 
protecting it from transmitted RF was needed.  The desire for QSK may 
make this a little difficult.

A conventional noise limiter would still be needed to handle the left 
over sources.

73 de Brian/K3KO



On 6/21/2017 1:39 AM, john at kk9a.com wrote:
> But that is not what NK7Z is suggesting.  He suggested a built in noise
> canceller which would be awesome!
>
> John KK9A
>
> Don Wilhelm wrote
> Tue Jun 20 19:51:45 EDT 2017
>
> Dave,
>
> The K3S has a receive antenna connection so you can do exactly that.
> The low noise antenna is up to the operator to provide.
> If you have the KRX3 option installed, diversity reception may also help.
>
> 73,
> Don W3FPR
>
> On 6/20/2017 6:21 PM, Dave Cole wrote:
>> What would be really nice would be to have a separate antenna designed
>> for noise reception, and the ability to phase shift it from the normal
>> antenna, allowing for noise cancellation...
>
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