RE: [DX-CHAT] Automatic Antenna Tuners
Hello. It is possible to use it from 10m to 20m, but lower bands can be matched also, it only depends on the tuner. Anyway, for low (40/80m) bands, a solution with capacitive hats on top should provide a better efficiency of the radiant system, but that's work for further analysis. Best regards, -- Sérgio Matias CT2HMN _ De: Ragnar Otterstad [mailto:[EMAIL PROTECTED] Enviada: sábado, 28 de Abril de 2007 3:26 Para: [EMAIL PROTECTED] Assunto: RE: [DX-CHAT] Automatic Antenna Tuners For what bands will you be using this ? 73 RAG Ragnar Otterstad LA5HE JW5HE OZ8RO -Original Message- Subject: [DX-CHAT] Automatic Antenna Tuners Hello all. As I have one automatic antenna tuner for random wire (like the Icom AH-4 or Yaesu FC-40), I installed it along with an old aluminium vertical element, with about 5.5m (18ft) of length, to make a multiband vertical antenna. I did some searches on the internet about the same topic and came with some results. Comments say that this vertical antenna approach is not very different in terms of efficiency comparatively to a multiband vertical antenna from a commercial manufacturer. Being the only practical solution I have for my location, and as I'm in the process of testing and experimenting with it for further analysis, I would like to read some comments about this configuration from other users. Best regards, -- Sérgio Matias, CT2HMN Subscribe/unsubscribe, feedback, FAQ, problems http://njdxa.org/dx-chat To post a message, DX related items only, dx-chat@njdxa.org This is the DX-CHAT reflector sponsored by the NJDXA http://njdxa.org
RE: [DX-CHAT] Automatic Antenna Tuners
Hello Victor. In my case I used an External remote automatic antenna tuner (like the FC-40 or AH-4) but instead of connect it to a wire, either in horizontal or vertical mount, I adapted it to an old 10m vertical antenna I had here, with about 5.5m of length, bypassing (you can remove also) the matching section. Simply connect the RF output of the tuner to the aluminium element and that's it. Grounding should be provided also, as recommended. The tuner can match the vertical element in all bands from 80 to 10m, but as the length is not sufficient for the lower bands, the efficiency is reduced. To overpass this limitation on the lower bands, it is recommended (as I read somewhere) to use capacitive hats on the top of the vertical element. Also, documentation of this kind of tuners says that lengths of wire near 1/2 wavelength of the frequency you plan to use should be avoided, due to the high voltage present on the RF output terminal of the tuner. Playing a little bit with a spreadsheet, you can get a good length that is fine for all bands. And, with this solution, you may have to stick to a limited range of models from a certain brand, or you can buy a non-big three brands tuner, which works with every transceiver. Best regards, -- Sérgio Matias, CT2HMN De: Clubul Sportiv UNIVERSITATEA Brasov YO6KSU Assunto: Re: [DX-CHAT] Automatic Antenna Tuners Dear Sergio. I am very interesting for matching the antenna. Please give more information Tnx 73 ! yo6mp Victor - ham of YO6KSU team Subscribe/unsubscribe, feedback, FAQ, problems http://njdxa.org/dx-chat To post a message, DX related items only, dx-chat@njdxa.org This is the DX-CHAT reflector sponsored by the NJDXA http://njdxa.org
[DX-CHAT] Automatic Antenna Tuners
Hello all. As I have one automatic antenna tuner for random wire (like the Icom AH-4 or Yaesu FC-40), I installed it along with an old aluminium vertical element, with about 5.5m (18ft) of length, to make a multiband vertical antenna. I did some searches on the internet about the same topic and came with some results. Comments say that this vertical antenna approach is not very different in terms of efficiency comparatively to a multiband vertical antenna from a commercial manufacturer. Being the only practical solution I have for my location, and as I'm in the process of testing and experimenting with it for further analysis, I would like to read some comments about this configuration from other users. Best regards, -- Sérgio Matias, CT2HMN Subscribe/unsubscribe, feedback, FAQ, problems http://njdxa.org/dx-chat To post a message, DX related items only, dx-chat@njdxa.org This is the DX-CHAT reflector sponsored by the NJDXA http://njdxa.org
