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Questions on broadband antenna design (e.g. T2FD)
"C. J. Clegg" wrote in message news On Tue, 21 Nov 2006 22:19:44 +0000, Wayne wrote: I don't have the technical data you ask about, but I do have experience in installing systems such as you describe. We simply used the commercially available B&W broadband loaded dipole. Good afternoon, Wayne. That's certainly an option, but as I said I would rather not spend $200+ unnecessarily, especially since I already have all of the necessary materials except for the terminating resistor. Anyway, the BWD-65's lower end is 4 MHz, and some of what I've read about T2FD antennas seems to indicate that near the low end is where efficiency is worst (inside of the design range ... outside of the design range it is MUCH worse). I suppose I could use the BWD-90 but I have a hard time understanding how they get all the way from 1.8 to 30 ... that seems very, very wide even for a T2FD antenna (I suppose it's a moot point, though... I'm sure it will get to my upper limit of 9 MHz nicely). As an aside, I see from the latest HRO catalog that the BWD-20, BWD-45, and BWD-65 are all $220 and the larger / longer BWD-90 is only $200. Why do you all suppose the bigger one is cheaper than all of the smaller ones? Yes, as I said, I don't have the technical data. I just wanted to cite experience that would indicate that you can most likely be successful in using an antenna such as a T2FD for your application. Good luck. |
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