Dual band antenna
Dual band antenna
Has anyone got some plans for a dual band yagi antenna 2m 70cm handy?
I can't seem to find much on google.
Ben
I can't seem to find much on google.
Ben
Last edited by VK5TX on Sat Mar 30, 2013 5:33 pm, edited 1 time in total.
Re: Dual band antenna
Hi Ben try this one Im using one i made at xmas timeVK5TX wrote:Has anyone got some plans for a dual band antenna 2m 70cm handy?
I can't seem to find much on google.
Ben
http://vk2zoi.com/articles/dual-band-hi ... lower-pot/
Andy Kay VK3VKT can be found lurking on VK3RBW 438.450 91.5 tone
Club net 8pm Wednesday nights on the above repeater open to all
MERC Webpage | MERC Facebook Group | My QSL Card site
Club net 8pm Wednesday nights on the above repeater open to all
MERC Webpage | MERC Facebook Group | My QSL Card site
Re: Dual band antenna
Thanks for that but I was looking for a yagi.
Ben
Ben
Re: Dual band antenna
Hi Ben
You can find few designs at DK7ZB web pages ... http://www.qsl.net/dk7zb/Duoband/duoband_principles.htm
I had tried to design something like that but never got reasonably good performance so gave up on that ... my result
was very similar to what Martin presented and for me that was not good enough ....
problem is that 144MHz elements are close to 432MHz WL multiplier hence interaction is significant and I never liked
those "maple leaf" shaped radiation patterns on 70cm ... however, this may work for small distance communication
and FM repeater opening but it is far from a mono band yagi performance and specifications - it all depend on what
you need such antenna for
Pop, YU7EF
You can find few designs at DK7ZB web pages ... http://www.qsl.net/dk7zb/Duoband/duoband_principles.htm
I had tried to design something like that but never got reasonably good performance so gave up on that ... my result
was very similar to what Martin presented and for me that was not good enough ....
problem is that 144MHz elements are close to 432MHz WL multiplier hence interaction is significant and I never liked
those "maple leaf" shaped radiation patterns on 70cm ... however, this may work for small distance communication
and FM repeater opening but it is far from a mono band yagi performance and specifications - it all depend on what
you need such antenna for
Pop, YU7EF
Re: Dual band antenna
I'm ecstatic with the way this one has worked out for me:
http://www.adl303.oevsv.at/technikecke/dlogpant/
Technically, a log periodic, not a yagi, but do you care?
Very clever design - elements *sized* for 2 mtrs, but spacing optimised for 70 cm.
Because of the 3:1 frequency ratio, the match is good, but the gain is great!
Happy Easter!
John VK4TJ
http://www.adl303.oevsv.at/technikecke/dlogpant/
Technically, a log periodic, not a yagi, but do you care?
Very clever design - elements *sized* for 2 mtrs, but spacing optimised for 70 cm.
Because of the 3:1 frequency ratio, the match is good, but the gain is great!
Happy Easter!
John VK4TJ
Re: Dual band antenna
I know Ron VK3AFW made one for portable work. 3 elements on 2m and 6 on 70cm or something. Can't remember if it was written up in AR or not.
-------------------------
Peter VK3YE http://www.vk3ye.com
NEW FOR 2019! Illustrated International Ham Radio Dictionary. 200 page Kindle ebook. $AU $5.99. Get yours at http://home.alphalink.com.au/~parkerp/dictionary.htm
Peter VK3YE http://www.vk3ye.com
NEW FOR 2019! Illustrated International Ham Radio Dictionary. 200 page Kindle ebook. $AU $5.99. Get yours at http://home.alphalink.com.au/~parkerp/dictionary.htm
Re: Dual band antenna
I'm not sure about AR, but Ron did present this at Gippstech 2001. If you can get access to a copy of the 2001 Proceedings, it's on page 45. 3 elements on 2 m; 7 elements on 70 cm.VK3YE wrote:I know Ron VK3AFW made one for portable work. 3 elements on 2m and 6 on 70cm or something. Can't remember if it was written up in AR or not.
Or perhaps Peter VK3PF will appear like magic from a cloud of smoke and point the way to a soft copy version?
73,
Barry
VK3BJM
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Re: Dual band antenna
Have a look on Ham Universe here http://www.hamuniverse.com/antennas.html
Loads of antennas of every type you are sure to find what you want.
73 Dave
Loads of antennas of every type you are sure to find what you want.
73 Dave
David
VK5PL
VK5PL
Re: Dual band antenna
I have a published design for a 2m / 70cm (crossed) Yagi for /P use.
Just Google 'VK2GOM Yagi' and that should find it. It's on the web in a few places including the AMSAT VK pages.
73 - Rob VK2GOM / GW0MOH
Just Google 'VK2GOM Yagi' and that should find it. It's on the web in a few places including the AMSAT VK pages.
73 - Rob VK2GOM / GW0MOH
- VK3BQ
- Forum Diehard
- Posts: 617
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Re: Dual band antenna
Always this cheap commercial version. http://www.eham.net/reviews/detail/3297
Re: Dual band antenna
I made this also - it works very well. Is very compact, I made mine out of "heavier" gauge materials than was really necessary so it needs a strong rear mounting arrangement.VK4TJ wrote:I'm ecstatic with the way this one has worked out for me:
http://www.adl303.oevsv.at/technikecke/dlogpant/
Technically, a log periodic, not a yagi, but do you care?
Very clever design - elements *sized* for 2 mtrs, but spacing optimised for 70 cm.
Because of the 3:1 frequency ratio, the match is good, but the gain is great!
Happy Easter!
John VK4TJ
Re: Dual band antenna
Ben,
I built one of these, the 5-8 element version for field day use. There are also details for a more permanent construct version as well.
http://www.qsl.net/dk7zb/Duoband/duoband_principles.htm
Very happy with it's performance over the last few yeas as a field day antenna, and as a home station set of ears whilst the big antenna's were down during our renovations...
Cheers
Andy - VK5LA
I built one of these, the 5-8 element version for field day use. There are also details for a more permanent construct version as well.
http://www.qsl.net/dk7zb/Duoband/duoband_principles.htm
Very happy with it's performance over the last few yeas as a field day antenna, and as a home station set of ears whilst the big antenna's were down during our renovations...
Cheers
Andy - VK5LA
Re: Dual band antenna
I've bulit one of these for AMSAT use. Works very well indeed.VK2GOM wrote:I have a published design for a 2m / 70cm (crossed) Yagi for /P use.
Just Google 'VK2GOM Yagi' and that should find it. It's on the web in a few places including the AMSAT VK pages.
73 - Rob VK2GOM / GW0MOH
Rick Kowalewski
-- Perth, WA, 6530 -- OF77xw --
VK6RK
-- Perth, WA, 6530 -- OF77xw --
VK6RK