Re: [Repeater-Builder] re: DDRR Antenna on a tower
On Fri, 11 Jun 2010, skipp025 wrote: Keep in mind the DDRR Antenna is a reduced size vertical polarized antenna and the Squalo Ho-Loop are normally considered full or standard size loop type antennas that are horizontally polarized. DDRR Antenna mounted on a tower? Only if there were no other decent options.Maybe, but I've never run into that situation. That would definately earn you the hammie award, which is a downward look from the commercial guys. Also, DDRRs are notoriously touchy about the local environment and tuning. Expect a 500KHz wide 2:1 and if anything changes within a wavelength or less of the antenna, it's tuning will change. In short, it's an antenna best used as a mobile, where you're likely to be able to keep it in tune. -- Kris Kirby, KE4AHR Disinformation Analyst
[Repeater-Builder] Re: DDRR Antenna on a tower
Re: DDRR Antenna on a tower Keep in mind the DDRR Antenna is a reduced size vertical polarized antenna and the Squalo Ho-Loop are normally considered full or standard size loop type antennas that are horizontally polarized. DDRR Antenna mounted on a tower? Only if there were no other decent options. Maybe, but I've never run into that situation. Kris Kirby k...@... wrote: That would definately earn you the hammie award, which is a downward look from the commercial guys. Don't want the commercial radio guys looking down at me any more than they already do... Also, DDRRs are notoriously touchy about the local environment and tuning. Expect a 500KHz wide 2:1 and if anything changes within a wavelength or less of the antenna, it's tuning will change. Possibly why they are normally supplied with a radome. In short, it's an antenna best used as a mobile, where you're likely to be able to keep it in tune. Hasn't been a problem so far, but I could be the exception to the rule book. I'll Keep the Kreco and Sinclair LB Antennas in place on the tower. thanks, s.
[Repeater-Builder] re: DDRR Antenna on a tower
cruizzer77 atlant...@... wrote: This DDRR antenna is also new to me but space-wise it is even smaller than the Squalo so definitely worth considering, Keep in mind the DDRR Antenna is a reduced size vertical polarized antenna and the Squalo Ho-Loop are normally considered full or standard size loop type antennas that are horizontally polarized. And most mobiles working FM are vertical polarized signals. ... especially because I wouldn't want to try the squalo if the majority says it won't perform as expected. It should preform exactly as we expect it would. But not as you might desire it would... Would you use just one of them even though it's on the side of the tower or 2 or 4 of them around? Squalo /or Ho-Loop rotated out of the normal mounting plane and installed on a tower? Zero or not Your intention of possibly mounting a rotated Squalo or Ho-Loop is a popcorn fart. They are normally considered a standard size loop and by the time you get one installed you've practically reached the size of a standard 1/4 ground plane. So avoid the obvious waste of time... and money. DDRR Antenna mounted on a tower? Only if there were no other decent options.Maybe, but I've never run into that situation. s.
