[Elecraft] Diversity receive versus QRM eliminators

[donovanf at starpower.net]

Diversity is not helpful as a QRM eliminator. 


Antennas with steerable nulls can be helpful, small loop antennas have 
very deep nulls but also require a high gain, low noise figure preamp 
and very careful attention to common mode rejection during installation 


73 
Frank 
W3LPL 

----- Original Message -----

From: gt-i at gmx.net 
To: "Elecraft Reflector" <elecraft at mailman.qth.net> 
Sent: Monday, June 29, 2020 5:18:30 PM 
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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