[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,

One other thing to consider is whether the interference is actually 
coming in on the "earth" connection.  With the K2, on 80m, I find that 
the noise drops drastically when I disconnect from the mains power 
supply (a very old one that has high leakage and therefore needs to be 
earthed and the secondary side) and run on a battery.  It drops from 
about S9 to about S2 (although my S meter calibration is suspect).  This 
is using a crude indoor doublet, with a BL-1 and with a clamp on ferrite 
ring on five or six turns of the DC supply cable.

My impression is that the BL-1 isn't terribly effective on an 
electrically short (about 10m either side, although not in a straight 
line) antenna at 80m, even though the KAT-2 can tune it.  I'm going to 
have to do more research on indoor antennas.

I'm in a first floor flat and running a separate functional (RF) earth 
is not possible, and it would be electrically long if I ran it, anyway. 
  Note, make sure that you understand the issues about protective 
multiple earthing, and know how your electricity supply is done, before 
providing any alternative earthing.

-- 
David Woolley
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