[Elecraft] K3, diversity and noise reduction

[David Woolley]

This is normally done ahead of the aerial input and will work with any 
receiver that supports such an input.

Effectively what you are doing is creating a null in the antenna pattern 
in the direction of the source.

It needs an effective point source to work well.  If the signal is 
getting out through the mains lead, it may be more difficult.

http://www.g8jnj.net/rfnoisecancellation.htm
http://www.eham.net/reviews/detail/1138
http://www.eham.net/reviews/detail/1205

Incidentally, the first article claims a 30dB, rather than 20dB null.
-- 
David Woolley
Owner K2 06123



On 26/05/15 02:00, Tony McRae wrote:
> I have been watching some youtube clips showing how by adjusting the phase and amplitude of two received signals on a diversity receiver local noise can be reduced by more than 20db.
> This would be particularly useful to me as I have the dirtiest plasma TV on one side of me and a gaggle of cheap ADSL routers on the other. When pointed at them with my yagi the noise floor on 20-15m is over S7.
>
> The equipment used in the clip was the ANAN 100D SDR.
> Is anyone aware if this technique is possible using the K3 dual receivers?
> I have not found any place in the manual where it is possible to alter the phase of the secondary or primary signals.