| T.R | Title | User | Personal
Name | Date | Lines |
|---|
| 495.1 | do the match and balance at the same time.. | TEKVAX::KOPEC | Consider a spherical chicken; .. | Mon Mar 17 1997 14:09 | 11 |
| If you're really concerned about getting every watt to the antenna, I'd
use twin-lead of some sort to feed the antenna, and build a
link-coupled tuner with a balanced output link. Carefully constructed
with air-core and air-dielectric parts, such a tuner can be very
low-loss, and you deal with the matching and the balanced-unbalanced
issued at the same time.
Lots of ham handbooks have info on such things; I can scan something in
if you don't have access to any..
...tom
|
| 495.2 | Twin line losses | BIS6::VANDEWEYER | | Tue Mar 18 1997 10:48 | 6 |
| Thanks Tom for the reply.
My intention was to use coax because of the better quality. Wont I lose
to mutch power in the twin lead. I have to cover a distance of about 35
meters.
Regards, Dirk.
|
| 495.3 | much less loss than coax.. | TEKVAX::KOPEC | Consider a spherical chicken; .. | Thu Mar 20 1997 06:06 | 15 |
| as long as you keep it away from the ground and conductive objects,
parallel-line is very low loss.. especially when run with a high SWR
(which you'll have, unless you do some matching at the antenna)
I would probably use osmething better than TV twinlead if this is a
permanent installation (I like the smaller window lead; 18ga stranded
copper conductors, about half an inch spacing, black poly insulation)
I've found that the wider window lead with solid copperweld conductors
doesn't hold up well if it is subject to any flexing at all..
("window lead" is solid-dielectric parallel-conductor line with
"windows" punched out of the dielectric)
...tom
|