Home |
Search |
Today's Posts |
#14
![]() |
|||
|
|||
![]()
Paul Burridge wrote in message . ..
.... It's annoying, because the tx output Z I'm trying to match is (by a strange coincidence) 140 ohms! So a folded dipole would be ideal, I guess. However - and it's a big *however* - I can't use one. I'm stuck with a telescopic whip and a ground plane the size of a box of Swan Vestas. I imagine the radiation resistance of such a non-ideal antenna is pretty low, but until someone can gimme a ballpark figure for it, I can't even begin to think about how to go about matching it. :-( Paul, it would be reeeeally helpful if you'd include enough info so we could give you a ballpark figure. What wavelength (or frequency)? How long is the antenna? How big is that box? (Will someone be holding it during operation?) Yeah, someone did offer a ballpark figure, but that depends a whole lot on what fraction of a wavelength you have for your antenna and your ground plane. (Or perhaps the posting in which you explained all that hasn't made it to this corner of the universe.) Cheers, Tom |
Thread Tools | Search this Thread |
Display Modes | |
|
|
![]() |
||||
Thread | Forum | |||
Radiation Resistance & Efficiency | Antenna | |||
Measuring radiation resistance | Antenna | |||
50 Ohms "Real Resistive" impedance a Misnomer? | Antenna |