[FoxHunt] antennas for harmonic sniffing
WolfBob
[email protected]
Tue, 27 Jan 2004 23:01:29 -0800
Great Dale:
The URL is not working try:
http://www.cebik.com/wb46.html
for his wide spaced 6 el. 420, I didn't find the short one.
The dimensions for my 6 el wide spaced is:
F=732.825 (146.565 X 5) wavelength= 16.106 in. 1/8 in. brass welding rod
ref 7 3/4 0
drv 7 1/16 3
1 7 6 7/8
2 6 7/8 10 3/4
3 6 7/8 14 5/8
4 7 18 1/2
At 55 inches off real ground:
Vert pol lobe 3dB=48.2 deg G=16.05 dB
Horz pol lobe 3dB=42 deg G=17.91 dB
Bob, WB6JPI
Kuon & Dale Hunt wrote:
>
>
> I used the metric scale on my ruler since it was
> a whole lot easier than trying to convert the
> scaled element dimensions to thirty-seconds of
> an inch.
>
> Element diameter 1/8" or #8 wire, insulated boom
> Design frequency 730 MHz
> Direct 50 ohm feed.
>
> length spacing from reflector
> inch mm inch mm
>
> reflector 8.158 207
> driver 7.957 202 2.04 52
> dir 1 7.295 185 2.88 73
> dir 2 7.025 178 5.21 132
> dir 3 7.025 178 7.49 190
> dir 4 6.690 170 10.90 277
>
> Note that the spacing between the driven element and
> the first director is very small - less than 3/4".
> Total length is under 11". It may look a bit funny,
> but it has a nice clean pattern and sharp lobe. I
> scaled this from W4RNL's "OWA" design: design info
> and pattern plots for other bands are available on
> his web site at www.cebik.com/radio/
>
> Might be optimized further - I haven't modeled it.
>
>
> ---
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