Can someone steer me towards a yagi design that works,
I know there are heaps on the net.
What I want it is a design you use and have had good results and repeatable results with.
I can bend alum tube, never made a folded dipole before, but got a pipe bender here.
Willing to have a go.
Andy
---------------------------------------------------------------------------- Andrew Rich VK4TEC vk4tec@people.net.au http://www.tech-software.net
The Cheap Yagis by WA5VJB work great and are easy to make:
< http://wa5vjb.com/yagi-pdf/cheapyagi.pdf >
< http://www.wa5vjb.com/references/Cheap%20Antennas-LEOs.pdf >
Precise measurements of element length at 432 are important. You should strive for measurements of at least +/-1/16" with +/- 1/32" better. For the metric inclined you should strive for +/- a mm. These tolerances are possible with a good metal rule, but a bit more difficult with a wooden rule or tape measure. Cut the element a bit long and then file or grind to the proper length checking often.
I have made the 3, 4, and 6 element 2M versions and the 11 element 432 version. They all work well with sharp patterns. They have close to 50 Ohm impedance without adjustment. Let me know if you have any more questions, and more importantly, let us know how it all turns out. - Dr. Megacycle KK6MC/5
-- James Duffey KK6MC/5 Cedar Crest NM 87008 DM65
The Cheap Yagis by WA5VJB work great and are easy to make:
< http://wa5vjb.com/yagi-pdf/cheapyagi.pdf >
< http://www.wa5vjb.com/references/Cheap%20Antennas-LEOs.pdf >
I have to totally agree here. They won't necessarily win on the antenna range, but they have to be the easiest antennas I've ever built that have consistently tuned easily and worked.
73, Howard G6LVB
I second this. These antennas are easy to construct and there is no matching section to fiddle with. You can also construct a pair offset on one boom for RHCP or LHCP, even switchable just like any other satellite yagi but then you have to start dealing with phasing harnesses. I don't have an SWR analyzer for that task so I've just got 11 elements and 4 elements vertically polarized on 70cm and 2 meters respectively. They worked quite well when I had a rig! I'm trying now to find one I can afford so I can get back in the game. I miss it! 73, Michael, W4HIJ James Duffey wrote:
The Cheap Yagis by WA5VJB work great and are easy to make:
< http://wa5vjb.com/yagi-pdf/cheapyagi.pdf >
< http://www.wa5vjb.com/references/Cheap%20Antennas-LEOs.pdf >
Precise measurements of element length at 432 are important. You should strive for measurements of at least +/-1/16" with +/- 1/32" better. For the metric inclined you should strive for +/- a mm. These tolerances are possible with a good metal rule, but a bit more difficult with a wooden rule or tape measure. Cut the element a bit long and then file or grind to the proper length checking often.
I have made the 3, 4, and 6 element 2M versions and the 11 element 432 version. They all work well with sharp patterns. They have close to 50 Ohm impedance without adjustment. Let me know if you have any more questions, and more importantly, let us know how it all turns out. - Dr. Megacycle KK6MC/5
-- James Duffey KK6MC/5 Cedar Crest NM 87008 DM65
Sent via AMSAT-BB@amsat.org. Opinions expressed are those of the author. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
Thanks guys, construction is under way
I have a question, directors 3 4 5 of the first yagi then displaced by 6.5 inches come very close to some directors of the second offset yagi 6.5 inches.
Is it ok to just jump forward a bit to stop the clash ?
They come withing mm of each other
Did you find this ?
---------------------------------------------------------------------------- Andrew Rich VK4TEC vk4tec@people.net.au mailto:vk4tec@people.net.au http://www.tech-software.net
-----Original Message----- From: amsat-bb-bounces@amsat.org [mailto:amsat-bb-bounces@amsat.org]On Behalf Of Michael Tondee Sent: Friday, 28 December 2007 11:08 AM Cc: Amsat-Bb@Amsat. Org Subject: [SPAM] [amsat-bb] Re: 70cm yagi design Importance: Low
I second this. These antennas are easy to construct and there is no matching section to fiddle with. You can also construct a pair offset on one boom for RHCP or LHCP, even switchable just like any other satellite yagi but then you have to start dealing with phasing harnesses. I don't have an SWR analyzer for that task so I've just got 11 elements and 4 elements vertically polarized on 70cm and 2 meters respectively. They worked quite well when I had a rig! I'm trying now to find one I can afford so I can get back in the game. I miss it! 73, Michael, W4HIJ James Duffey wrote:
The Cheap Yagis by WA5VJB work great and are easy to make:
< http://wa5vjb.com/yagi-pdf/cheapyagi.pdf >
< http://www.wa5vjb.com/references/Cheap%20Antennas-LEOs.pdf >
Precise measurements of element length at 432 are important. You should strive for measurements of at least +/-1/16" with +/- 1/32" better. For the metric inclined you should strive for +/- a mm. These tolerances are possible with a good metal rule, but a bit more difficult with a wooden rule or tape measure. Cut the element a bit long and then file or grind to the proper length checking often.
I have made the 3, 4, and 6 element 2M versions and the 11 element 432 version. They all work well with sharp patterns. They have close to 50 Ohm impedance without adjustment. Let me know if you have any more questions, and more importantly, let us know how it all turns out. - Dr. Megacycle KK6MC/5
-- James Duffey KK6MC/5 Cedar Crest NM 87008 DM65
Sent via AMSAT-BB@amsat.org. Opinions expressed are those of the author. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
_______________________________________________ Sent via AMSAT-BB@amsat.org. Opinions expressed are those of the author. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
One is done
Photos here
Up the pole she goes.
http://www.tech-software.net/70cmyagi/index.html
---------------------------------------------------------------------------- Andrew Rich VK4TEC vk4tec@people.net.au mailto:vk4tec@people.net.au http://www.tech-software.net
-----Original Message----- From: amsat-bb-bounces@amsat.org [mailto:amsat-bb-bounces@amsat.org]On Behalf Of Andrew Rich Sent: Friday, 28 December 2007 1:31 PM To: Michael Tondee Cc: Amsat-Bb@Amsat. Org Subject: [SPAM] [amsat-bb] Re: [SPAM] Re: 70cm yagi design
Thanks guys, construction is under way
I have a question, directors 3 4 5 of the first yagi then displaced by 6.5 inches come very close to some directors of the second offset yagi 6.5 inches.
Is it ok to just jump forward a bit to stop the clash ?
They come withing mm of each other
Did you find this ?
---------------------------------------------------------------------------- Andrew Rich VK4TEC vk4tec@people.net.au mailto:vk4tec@people.net.au http://www.tech-software.net
-----Original Message----- From: amsat-bb-bounces@amsat.org [mailto:amsat-bb-bounces@amsat.org]On Behalf Of Michael Tondee Sent: Friday, 28 December 2007 11:08 AM Cc: Amsat-Bb@Amsat. Org Subject: [SPAM] [amsat-bb] Re: 70cm yagi design Importance: Low
I second this. These antennas are easy to construct and there is no matching section to fiddle with. You can also construct a pair offset on one boom for RHCP or LHCP, even switchable just like any other satellite yagi but then you have to start dealing with phasing harnesses. I don't have an SWR analyzer for that task so I've just got 11 elements and 4 elements vertically polarized on 70cm and 2 meters respectively. They worked quite well when I had a rig! I'm trying now to find one I can afford so I can get back in the game. I miss it! 73, Michael, W4HIJ James Duffey wrote:
The Cheap Yagis by WA5VJB work great and are easy to make:
< http://wa5vjb.com/yagi-pdf/cheapyagi.pdf >
< http://www.wa5vjb.com/references/Cheap%20Antennas-LEOs.pdf >
Precise measurements of element length at 432 are important. You should strive for measurements of at least +/-1/16" with +/- 1/32" better. For the metric inclined you should strive for +/- a mm. These tolerances are possible with a good metal rule, but a bit more difficult with a wooden rule or tape measure. Cut the element a bit long and then file or grind to the proper length checking often.
I have made the 3, 4, and 6 element 2M versions and the 11 element 432 version. They all work well with sharp patterns. They have close to 50 Ohm impedance without adjustment. Let me know if you have any more questions, and more importantly, let us know how it all turns out. - Dr. Megacycle KK6MC/5
-- James Duffey KK6MC/5 Cedar Crest NM 87008 DM65
Sent via AMSAT-BB@amsat.org. Opinions expressed are those of the author. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
_______________________________________________ Sent via AMSAT-BB@amsat.org. Opinions expressed are those of the author. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
_______________________________________________ Sent via AMSAT-BB@amsat.org. Opinions expressed are those of the author. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
participants (4)
-
Andrew Rich -
Howard Long -
James Duffey -
Michael Tondee