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G0FTD > HELP 04.04.07 15:36l 35 Lines 1050 Bytes #999 (0) @ WW
BID : 000404093PZT
Read: GUEST
Subj: re: 1/2 wave end fed
Path: DB0FHN<DB0MRW<OK0PPL<DB0RES<ON0AR<7M3TJZ<ZL2BAU<GB7MAX<GB7PZT
Sent: 070404/1139Z @:GB7PZT.#24.GBR.EU [Kidderminster] #:40400 XSERV410h
Date: Wed, 04 Apr 2007 12:39:38 +0000
From: g0ftd@gb7pzt.#24.gbr.eu (Andy)
To: help@ww
Subject: re: 1/2 wave end fed
For 20m, you could always make the matching unit using an air core coil plus
postage stamp trimmer and housed in a 35mm film canister.
Coax in one end, wire out the other = simple throw up portable antenna.
> An equivalent circuit for explanation.
> ÚÄÄÄÄÄÄ´ ÃÄÄÄÄÄÄ¿
> ³ ³
> ÄÄÄ´ ÃÄÄÄxÄÄÄÄÄÄÄ//ÄÄÄÄÄÄÄ Horizontal or vertical.
> Connect to ³ ³ 20 metre dipole
> coax shield ÀÄÄÄÄÄ)))))ÄÄÄÄÄÙ
> By using a 'lossy' inductance (ferrite core) and a minimum of 'C', a fairly
> broad band-width could cover the desired frequencies of interest.
I used to be wary of anything ferrite for transmit purposes but eventually
learnt better. No ferrite core is lossy unless it's the wrong material or
incorrectly used.
> I haven't tried this,
I have, see above.
Hope this helps.
- Andy -
G0FTD @ GB7PZT
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