13B2 for 70CM?
 

What abt using my 13B2 for us on 440? I don't have an analyzer for that band
nor a swr meter. What are the thoughts on this? I have a friend in Houston
who does it and verifies it to be ok. Responses and thoughts appreciated.

"AO KD5FXT" wrote in message
...
What abt using my 13B2 for us on 440? I don't have an analyzer for that
band
nor a swr meter. What are the thoughts on this? I have a friend in
Houston
who does it and verifies it to be ok. Responses and thoughts appreciated.

Seem like a waste of a good Cushcraft 13B2 (13 element yagi) 2 meter antenna
($ 150 MSRP)
for 440 MHz antenna. http://www.chq-inc.com/cush/13B2.html

What are you trying do on 70 cm ? (440MHz) SSB/CW DX, FM repeaters, ATV,
satellite work

1. When you move from 2 meters to 70 cm -- the coax you use from you
operating position to the antenna
becomes much more important than at HF or low VHF frequencies.

For example, for 100 feet of coax the attenuation in dB [from Cable X-perts
charts]
http://www.cablexperts.com/cfdocs/ca...USA_ship=1&c=0

RG-213/U at 150 MHz - 2.8 dB; at 450 MHz - 5.2 dB
LMR-400 at 150 MHz - 1.5 dB; at 450 MHz - 2.7 dB

2. Some designs to consider !

K5OE 70 cm yagi designs (in this case for AO-40)
http://members.aol.com/k5oe/P3D_ant/P3D_yagi.htm

VK3KHB 8 element design for ATV usage
[Uses 1/8" (~3 - 5 mm) solid rod for elements and round or square aluminum
tube (~ 10 mm)
http://www.gak.net.au/vk3khb/atv/antdesign.htm

WiMo products [Germany] - great for ideas
http://www.wimo.com/verteiler-e.htm?s1_e.htm

KK5UFO designs
http://www.homestead.com/kk5ufo/VHFbluprint.html

XE1MEX design (for 2m and 70cm)
http://xe1mex.gq.nu/antenas/yagi.html

Martin DK7ZB very nice designs
http://www.qsl.net/dk7zb/start1.htm

Derek, G4CQM
http://www.g4cqm.btinternet.co.uk/an...gner/yagis.htm

That's a start !!

w9gb
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I forgot Kent Britain, WA5VJB
Cheap Yagi antennas for VHF / UHF

http://www.clarc.org/Articles/uhf.htm

Element spacing and lengths provided on web site

w9gb
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If you do this. Don't assume the main lobe will be straight ahead. I have
used a 7 el Cushcraft on 432, and found its best direction was about 30
degrees to one side. It had a gamma match.

Tam/WB2TT
"AO KD5FXT" wrote in message
...
What abt using my 13B2 for us on 440? I don't have an analyzer for that
band
nor a swr meter. What are the thoughts on this? I have a friend in
Houston
who does it and verifies it to be ok. Responses and thoughts appreciated.

G.Beat wrote:
"AO KD5FXT" wrote in message
...
What abt using my 13B2 for us on 440? I don't have an analyzer for that
band
nor a swr meter. What are the thoughts on this? I have a friend in
Houston
who does it and verifies it to be ok. Responses and thoughts appreciated.

Seem like a waste of a good Cushcraft 13B2 (13 element yagi) 2 meter antenna
($ 150 MSRP)
for 440 MHz antenna. http://www.chq-inc.com/cush/13B2.html

What are you trying do on 70 cm ? (440MHz) SSB/CW DX, FM repeaters, ATV,
satellite work

1. When you move from 2 meters to 70 cm -- the coax you use from you
operating position to the antenna
becomes much more important than at HF or low VHF frequencies.

For example, for 100 feet of coax the attenuation in dB [from Cable X-perts
charts]
http://www.cablexperts.com/cfdocs/ca...ub=0&bskt=0&US
A_ship=1&c=0

RG-213/U at 150 MHz - 2.8 dB; at 450 MHz - 5.2 dB
LMR-400 at 150 MHz - 1.5 dB; at 450 MHz - 2.7 dB

2. Some designs to consider !

K5OE 70 cm yagi designs (in this case for AO-40)
http://members.aol.com/k5oe/P3D_ant/P3D_yagi.htm

VK3KHB 8 element design for ATV usage
[Uses 1/8" (~3 - 5 mm) solid rod for elements and round or square aluminum
tube (~ 10 mm)
http://www.gak.net.au/vk3khb/atv/antdesign.htm

WiMo products [Germany] - great for ideas
http://www.wimo.com/verteiler-e.htm?s1_e.htm

KK5UFO designs
http://www.homestead.com/kk5ufo/VHFbluprint.html

XE1MEX design (for 2m and 70cm)
http://xe1mex.gq.nu/antenas/yagi.html

Martin DK7ZB very nice designs
http://www.qsl.net/dk7zb/start1.htm

Derek, G4CQM
http://www.g4cqm.btinternet.co.uk/an...gner/yagis.htm

That's a start !!

w9gb

Also the 'VHF/UHF Long Yagi Workshop' on my site.

--
73 from Ian G3SEK 'In Practice' columnist for RadCom (RSGB)
Editor, 'The VHF/UHF DX Book'
http://www.ifwtech.co.uk/g3sek

"Ian White, G3SEK" wrote in message
...
G.Beat wrote:
"AO KD5FXT" wrote in message
...
2. Some designs to consider !

K5OE 70 cm yagi designs (in this case for AO-40)
http://members.aol.com/k5oe/P3D_ant/P3D_yagi.htm

[snip]


That's a start !!

w9gb

Also the 'VHF/UHF Long Yagi Workshop' on my site.

--
73 from Ian G3SEK 'In Practice' columnist for RadCom (RSGB)
Editor, 'The VHF/UHF DX Book'
http://www.ifwtech.co.uk/g3sek

Sorry Ian ! I did not have your site readily bookmarked !!
[That's been addressed now ! ]

Cheers

Greg
w9gb
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