I perhaps have maybe a worst case scenario ... I live on a 60' by 90' lot in Houston. Fortunately I have some very nice tall pine trees that support my inverted L. It has one elevated radial in the shape of an L about 20' above the ground and the antenna is fed through a current balun. One leg of my K9AY loop is within 6' of the elevated radial and 40' from the antenna. Yes, I get significant noise transferred from the transmit antenna to the K9AY loop on receive. As per ON4UN's book, he suggests to ground the TX antenna during receive and I set up a relay to do such and as a result, there is a significant decrease in the received noise from the loop. The power line in my area is underground, underneath and parallel for some distance with that radial.
Just what I have managed to do here and have worked 155 countries with 600 W. 73, Mike WA5POK -----Original Message----- From: W2PM Sent: Monday, June 18, 2012 5:50 AM To: Bill and Liz Cc: <topband@contesting.com> Subject: Re: Topband: TX ANT TO RX ANT COUPLING Do you have much noise in the first place to reradiate? Line noise also is very spotty along a power line - along the same line of wires any nasty arcing noise can be very strong or very weak at certain spots so the noise level - if you have noise - may not be strong enough to reradiate with any affect. Sent from my iPad On Jun 17, 2012, at 17:34, "Bill and Liz" <ma...@isp.ca> wrote: > I have been following the thread with interest. I have a K9AY and a DO > loop > located within 60 to 75 ft of the TX vertical at our summer home. > Interestingly, I find both these antennas very quiet with no sign of noise > being coupled to them via the TX antenna. I work a lot of DX from this > location on topband using these loops as well as a pair of Beverages, both > of which also pass fairly close to my TX vertical and both of which are > very > quiet. > > So, why am I not hearing this noise many are experiencing? The TX > vertical > is a 60 ft toploaded affair and I do not de-tune it on receive. All I > have > done is to run all the feedlines for both RX antennas and the TX vertical > underground in different conduits to a remote switching location. Someone > please tell me why I am missing out on all the fun of having noise on my > RX > antennas. > > Bill, VE3CSK > > > > ----- > No virus found in this message. > Checked by AVG - www.avg.com > Version: 2012.0.2180 / Virus Database: 2433/5075 - Release Date: 06/17/12 > > _______________________________________________ > UR RST IS ... ... ..9 QSB QSB - hw? BK _______________________________________________ UR RST IS ... ... ..9 QSB QSB - hw? BK _______________________________________________ UR RST IS ... ... ..9 QSB QSB - hw? BK