[Elecraft] Anyone use a noise canceller?

[David Woolley]

Mark Hampton wrote:

> I have a S-9 noise level across the bands and despite some detective
> work, I have been unable to locate the source.

Noise cancelers would better be described as interference cancelers. 
They work by creating a null in the antenna pattern.  They cannot 
suppress thermal or undirected sky noise.

As such, if you don't know the direction of the source now, but 
successfully "noise" cancel it, you will have established some 
information about the direction, and could, in theory, have used other 
means to do that more directly.

A possible other approach would be to use a separate, receive antenna, 
positioned for minimum interference.  My impression is that noise 
cancelers only work well at frequencies where external noise and 
interference dominate receiver noise, so one should not need as 
efficient an antenna for receive as one does for transmit.

> Apologies for the off-topic post but I though I'd canvass opinions
> before I buy one.

I've removed the OT tag, as this appears, to me, to be on topic 
according to the guidelines, which allow more than just Elecraft 
hardware related articles.

-- 
David Woolley
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