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Old 02-13-2018, 10:56 AM
EricCottrell EricCottrell is offline
Join Date: Nov 2002
Location: Boston, Ma
Posts: 2,192


I have a Wellbrook ALA1530 loop and do see the nulls on LW/MW. Nearby metal objects can affect the nulls, so the loop should be in the clear. Nulls will not be of much help if you have nearby MW stations in different directions. I have several nearby MW stations with one of them causing about S9+70 (0 dBm or 1 milliwatt!) on my WJ-8711A. I can get a decent null on that station but still have strong signals from other stations.

I use an external MW Band Reject filter on some receivers, like the RSP1. Sometimes I have to throw in 10 dB attenuation. I also had problems years ago using dipoles and older tube type radios, mainly MW images up to about 3 MHz.

73 Eric
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