Pete, in my previous QTH the pole of the K9AY was in the corner of my house, both loops partly running alongside the walls. I had good nuls in all four directions and Iworked 230 dxcc on topband.
Kees, PE5T Verzonden vanuit Mail voor Windows 10 Van: Tim Shoppa Verzonden: zondag 24 januari 2021 16:53 Aan: N4ZR; topBand List Onderwerp: Re: Topband: K9AY Loop Proximity to Structures Pete, I live in a residential neighborhood (not the most dense by any means), and all my receive antennas will point towards my house or a nearby neighbor's house. There are certainly buzzes and whines in parts of 160M that are accentuated in some directions on some RX antennas and not so much in other directions and other antennas. Presumably these are a wide spectrum of consumer electronic devices. But (other than my daughter's horrible RFI producing LED strip power supply which has been banished, replaced by a linear supply) I can't say any one direction or antenna is overall worse than any other direction. When I'm picking a run frequency I tend to stay away from the worst of the buzzes and whines. The buzzes and whines wander and turn on and off. So sometimes what was a good run frequency is not so good later in the night. After midnight I think folks turn off their TV's and computers and I can tell the buzzes and whines bother me less. If you are worried about the directivity of the K9AY being affected by nearby structures, you might carefully listen to stations in various directions and figure out where the nulls are for each loop/direction. The null on a K9AY loop is very pronounced (unlike the forward directionality which is very broad). I see no indication that my house (which is less than 40 feet away from the K9AY I use most often) and the neighborhood chain line fences (which are less than 30 feet away from the K9AY) affects the null direction. Tim N3QE On Sun, Jan 24, 2021 at 9:29 AM N4ZR <[email protected]> wrote: > When I put up my K9AY loop, it was convenient to do so at a location in > my back yard where I already had a stub of tubing (from a defunct > birdhouse) protruding above ground. I didn't think about it before > this, but that puts the northeast lobe to Europe going through my house > at a distance of much less that 1/4 wavelength on 160. The house itself > is pretty RF-quiet, and the antenna seems to work (using it to select > one of two broadcast stations on the same frequency) but I'm wondering > if it would be worth the effort to move it to a location where it has a > clear shot to Europe > > -- > 73, Pete N4ZR > Check out the new Reverse Beacon Network > web server at <http://beta.reversebeacon.net>. > For spots, please use your favorite > "retail" DX cluster. > > _________________ > Searchable Archives: http://www.contesting.com/_topband - Topband > Reflector > _________________ Searchable Archives: http://www.contesting.com/_topband - Topband Reflector _________________ Searchable Archives: http://www.contesting.com/_topband - Topband Reflector
