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: [email protected] To: "Elecraft Reflector" <[email protected]> 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 ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [email protected] ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [email protected]
