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G6OHM > TECH 20.03.05 10:01l 113 Lines 2762 Bytes #999 (0) @ WW
BID : 56117_GB7HOL
Read: DK7JAN GUEST
Subj: Hentenna Design For Various Bands
Path: DB0FHN<DB0THA<DB0HDF<DB0ERF<DB0ROF<DB0AIS<DB0SIF<DB0EA<DB0RES<ON0AR<
7M3TJZ<JE7YGF<CT2GWY<GB7YKS<GB7YFS<GB7HOL
Sent: 050319/1534Z @:GB7HOL.#22.GBR.EU #:56117 [Holbeach] FBB7.00i $:56117_GB7H
From: G6OHM@GB7HOL.#22.GBR.EU
To : TECH@WW
r 289271
From : G0FTD
To : ANTENA@GBR
Type/status : B$
Date/time : 25-Jul 21:28
BID (MID) : FE6207G0FTD
Message # : 289271
Title : Re: Wanted Hentenna Design for 4m
(This message has been read 2 times so far in this BBS.)
Path: !GB7YFS!GB7TUT!GB7CIP!GB7SXE!
From: G0FTD@GB7SXE.#38.GBR.EU
To : ANTENA@GBR
THE HENTENNA
OK here's the dimensions as requested by G6OHM for the Hentenna in glorious
technicolour ascii ;-)
I've never used one, but according to my info the antenna radiates like a
HORIZONTAL dipole with the usual figure of eight pattern _but_ is in fact
vertically polarised.
Both lobes have 3.1db gain over a dipole.
A
_______________
| |
| |
| |
| |
| |
D | | D
| |
| |
| |
| |
|_______O_______|
| B B |
C | | C
|_______________|
A
O is of course the feedpoint !
50Mhz dimensions:
A=100cm
B=50cm
C=60cm
D=240cm
70Mhz dimensions:
A=71.3cm
B=35.65cm
C=42.7cm
D=171cm
145Mhz dimensions:
A=34cm
B=17cm
C=20.7cm
D=83cm
433Mhz dimensions:
A=11.5cm
B=5.75cm
C=7cm
D=27.7cm
1296Mhz dimensions:
A=38mm
B=19mm
C=23mm
D=93mm
Using MMANA simulation shows that the 23cms version has a max VSWR of 1.3:1
from 1292Mhz - 1230Mhz and a flat gain response across the whole range
(3db).
Hope this helps.
ZDDDDDDDDDDDDDDDDDDDD?
3 73 - Andy 3
3 G0FTD 3
3 Whitstable, Kent 3
322:00 on 2004-Jul-253
3 ZDDDDDDDDDDDDD? 3
3 3 [ 3 3
@DDADDDDDDDDDDDDDADDDY
--- End of messsage #289271 to ANTENA from G0FTD ---
(1) GB7HOL BBS>
Please note i have only tryed one on 4m and it did work.But i cannot say
how well the hentenna will work on other bands.
73 - ANDY, G6OHM @ GB7HOL
Message timed: 15:40 on 19 Mar 05
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