Hi Gernot.
I use an LZ1AQ double mag loop (rotateable) to null out as much hash as
possible. This feeds the RX Ant In input on the K3S. I also have an MFJ
Noise eliminator which is also inline, using the LZ1AQ as the main (RX)
antenna and I've tried a couple of antennas (including my HF vertical)
as the 'noise' antenna and I don't find any noise suppression by phase
elimination with the MFJ. I've yet to try a mini-whip antenna as the
'noise' antenna. I actually wonder if the MFJ unit is faulty, as I've
heard that other people have at least noticed a small difference when
using it. Once/if I get the MFJ untit to work, I may then buy one of the
more expensive noise eliminators.
73,
Alan. G4GNX
------ Original Message ------
From: [email protected]
To: "Elecraft Reflector" <[email protected]>
Sent: 29/06/2020 18:18:30
Subject: [Elecraft] Diversity receive versus QRM eliminators
Hello all,
In a recent rush to eliminate urban noise I bought an QRM eliminator.
The working principle is to null out signals by shifting the phases of
two antennas (one main/tx and one rx). I can see the effect sometimes,
but it is not the holy grail for all types of QRM. I still don't get rid
of the PSU/LED/plasmaish noise here, sometimes the S/N is a bit better
but maybe thats my inner impression to justify buying this thing.
Now, I do wonder how this differs from diversity receive, effectively
versus local QRM.
Note I have a 10m vertical as the 2nd ant, while the main ant is horizontal.
Any thoughts or hints ?
tnx 73 Gernot DF5RF
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