I originally started this thread and I want to once again thank everyone who provided input and advise both privately and on the reflector. So the 100' tall vertical with the 30' horizontal loading w
Two 100 x 3 ft rolls of chicken wire were added this fall. I have about 45 radials, good conductivity, clear view, and the sump pump dumps out nearby. It is quiet in the country but the beverages are
Modeling I've done shows it a bad idea to have in ground and elevated radials connected together, but that is not clear from what you described. Then with the elevated separate, moving the feedpoint
Hello Grant, Your advice is spot-on! Elevated radials MUST NOT be connected to ground. Perhaps that's one of the reasons why Todd's inverted-L is working so poorly. Another important thing is to have
Sorry, I wasn't completely clear in my post. The elevated radials are not connected to the buried radial field. They are two separate entities. Now the elevated radials do sit above or cross some the
Hi Todd, I'll bet the farm (if I had one) that your air-core choke is ineffective. Take at look at http://www.karinya.net/g3txq/chokes to see what I mean. A very, very good common mode choke is the o
Hi Mike, Oh, I would totally believe that the air-wound choke is ineffective at 160m. It just happens to be what I had available to use when I rigged up the elevated radials in the cold rain yesterda
A person emailed me to ask if I could take SWR readings at the rig without a tuner. Since my antenna analyzer is non-op due to the AM station nearby. The feedline is about 140' of LMR-240. Here is th
Those SWR readings seem to indicate a very large bandwidth, to the extent it might suggest that your ground resistance losses are swamping the antenna R radiation resistance. It would be nice to know
Problem #1. The swr indicates about a 140Khz plus < 2:1 bandwidth (2 * 1880-1810) which implies a high radial resistance. Are the elevated radials fully insulated from trees, not contacting foliage,
Hello Grant, Thanks for the input. I've made a couple of modifications this morning. I can't make that choke today because I don't have the FT240-31 but I'll check out that design and look into order
Exactly! You have a lot of loss in your ground (or something), Todd. Perhaps it's the lack of a proper feedline choke. 73, Mike www.w0btu.com _________________ Searchable Archives: http://www.contest
Hi Grant and Todd I suggest there is also potential for a 4th problem - mutual coupling between the vertical wire and supporting tree. Any such coupling would be smaller for the 43 ft vertical if it
Hmmm....you DID relocate or rebuild your ground system so it converges on a point below the bottom of the 100 foot tall wire right? I mean, you aren't using the 43 foot vert. ground system with the 1
Hi Rob, You ask some good questions and make some interesting observations. Nope, it is the same radial system. I don't have a reasonable way (time/money/effort) to create a whole new 50-60 wire buri
Todd If you are interested in experimenting, you could try a K2AV folded counterpoise under that inverted L. If installed as recommended, it will provide a decent counterpoise system. One advantage t
Todd, Thanks for sharing. I've been following your post. I too wondered about sharing the radial field like you did. My situation is somewhat similar in that I feed a 90 foot tower which has a c31 at
Hi Chet, Before we start, a disclaimer: I still have my MP, maybe I'm a radio hoarder. I do have a 75A3 and a Johnson Ranger and Courier and an FT 101ZD. The only long used radios I don't still have
Hello Guy, a very interesting evaluation of the 1000MP. Your diagnosis coincides with my observations with the K3. I did not own an FT-1000MP, but I was using my K3 for listening on the very crowded
Thanks again everyone. I've read all your suggestions and advise and although I won't be able to make some of the more difficult (or impossible at my site) changes there are a few things I'm willing