| |
GM0CSZ > ANTENN 27.05.05 01:25l 32 Lines 1166 Bytes #999 (0) @ WW
BID : A91944GM0CSZ
Read: GUEST OE1DMB DK3TB
Subj: Re: Randomwire .vs. Endfed Windom
Path: DB0FHN<DB0CL<DB0PDF<DB0SM<DB0EA<DB0RES<DK0WUE<7M3TJZ<IK1ZNW<GB7CRV<
GB7FUR<GB7IOM<GB7SAN<GB7INV<GB7NOS
Sent: 050524/2324Z @:GB7NOS.#76.GBR.EU #:33986 [Golspie] FBB7.00i $:A91944GM0CS
From: GM0CSZ@GB7NOS.#76.GBR.EU
To : ANTENN@WW
W5DXP wrote:-
> You can certainly use an end-fed Zepp on other bands but
> it won't be a Zepp on those other bands. The definition of
> a Zepp is 1/2WL long end-fed with 1/4WL open-wire feedline.
========
The Transmatch or the Johnson (balanced) matching unit works best when it
is offered a high antenna/feeder impedance , hence with a 1/2 wavelength
single wire antenna ,the (electrical)feeder length should also be near 1/2
wavelength (or a multiple of it) at the operating frequency.
If the wire antenna can't be made 1/2 wavelength the overall length of
antenna + feeder should be a multiple of 1/2 wavelength.
At the insulated end of the antenna there is a high impedance (ie NO
current hence high voltage) This condition repeats itself every 1/2
wavelength or every even number of 1/4 wavelength.
73 - Frank , GM0CSZ @ GB7NOS.#76.GBR.EU
Inver by Tain , IV20 1RX Scotland UK Loc: IO87AT
e-mail: gm0csz.kn6wh@dsl.pipex.com
Also in 2005 they say the future is bright ; 2 of its challenges remaining
to be RENEWABLE ENERGY and LINUX.
Message timed: 15:10 UTC on 24 May 2005
Read previous mail | Read next mail
| |
