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Old 14th Jun 2021, 2:35 pm   #1
Wendymott
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Default 2 metre Yagi antenna

Hi peeps.
Searched high and low on "Tinternet" for a reliable design for a 2 metre 4 ele yagi with folded loop dipole.
I thought I had seen one at one time or another.... but it is eluding me..has anyone got a link for Dimensions & a reliable easy to make matching element for 50 ohm coax.
Thanks
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Old 14th Jun 2021, 3:32 pm   #2
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Default Re: 2 metre Yagi antenna

A quick look about and... http://radio.meteor.free.fr/us/antenna.html you could simulate it in something like MMANA-GAL before going to metal.
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Old 14th Jun 2021, 3:36 pm   #3
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Default Re: 2 metre Yagi antenna

Do a search for 'NBS Technical Note #688' which documents extensive testing and modeling done by Peter Viezbicke on behalf of the US National Bureau for Standards in the mid-1970s.

There are plenty of 'ham band' designs based on this analysis.
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Old 14th Jun 2021, 3:38 pm   #4
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Default Re: 2 metre Yagi antenna

And, a Nano-VNA is an almost must for aerial fiddling, next day for 40 quid, half as much for a bit of a wait.

https://www.amazon.co.uk/Analyzer-50...685025&sr=8-10
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Old 14th Jun 2021, 10:03 pm   #5
Wendymott
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Default Re: 2 metre Yagi antenna

Hi Merlin. Got one had it a while

Thanks peeps.... I have an ex FM ant to cut down..
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Old 14th Jun 2021, 10:20 pm   #6
Cruisin Marine
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Default Re: 2 metre Yagi antenna

Don't cut too much off Wendy- it is a one way street
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Old 15th Jun 2021, 1:38 am   #7
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Default Re: 2 metre Yagi antenna

Oh, I dunno. I've TIGged bits on aerials for a few people. But cutting is definitely easier and cheaper.

David
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Old 15th Jun 2021, 2:33 am   #8
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Default Re: 2 metre Yagi antenna

Quote:
Originally Posted by Wendymott View Post
Thanks peeps.... I have an ex FM ant to cut down..
You'll have to adjust the spacing between elements as well as shortening them to get it to "work just right"

Here's one design https://vk3arr.wordpress.com/2016/07...ement-2m-yagi/
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Old 15th Jun 2021, 4:14 am   #9
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Default Re: 2 metre Yagi antenna

Hi Terry

Can thoroughly recommend Justins designs

https://www.g0ksc.co.uk/2013-yagis/1...a/5el-lfa.html

All the AL can be obtained from Bunnings and the stauff clamps from hydraulic/mining suppliers in most state capitals.

I'm using his designs for 6m and 2m.

I have a 7 el LFA for 2m and have worked into Melbourne on digital modes and SSB to Hamilton in VK3 (all > 2,700km). From a backyard of an inner suburban Perth QTH.

Matching is almost perfect and its easy to build the ferrite choke "balun".
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Old 15th Jun 2021, 5:06 am   #10
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Default Re: 2 metre Yagi antenna

Thanks Nigel.

All I need now are a new collapsible tower to put them on and something decent to put on the other end
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Old 15th Jun 2021, 4:02 pm   #11
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Default Re: 2 metre Yagi antenna

Quote:
Originally Posted by Wendymott View Post
Hi peeps.
Searched high and low on "Tinternet" for a reliable design for a 2 metre 4 ele yagi with folded loop dipole.
I thought I had seen one at one time or another.... but it is eluding me..has anyone got a link for Dimensions & a reliable easy to make matching element for 50 ohm coax.
Thanks
YU7EF starts at 6 elements

http://www.yu7ef.com/

Fred
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Old 16th Jun 2021, 10:38 pm   #12
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Default Re: 2 metre Yagi antenna

What's going on in W.Yorks on 2m now Wendy? I recall the late 60's early 70's when there were loads of people on AM, often Pye boxes, and J Beam '6 over 6' antennas were the must haves! Leeds had at least two ham radio clubs and there were two rallies there each summer.

Where I am now, I cannot hear anything at all; little activity and bad location (edge of a valley).

B
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Old 18th Jun 2021, 4:08 pm   #13
Wendymott
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Default Re: 2 metre Yagi antenna

Hi Bazz. I originally started life in the market town of Otley, on the north side of the river with a J Beam 8 ele and 15 W AM. Not much good apart from Leeds, etc as the big hill to the south was a great "stopper". I was a founder member of Otley Radio soc, and eventually ran the NMR "Northern Mobile Rally" for two years,....it has had many different organisations run it since. In my view the Liner2. killed it for me, as everyone and his auntie went SSB. I am now in Huddersfield, with a 5 ele Moonraker.... just to put me on... and I will build a 2M SSB transceiver.... for the NEXT SPE season.
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Old 18th Jun 2021, 4:13 pm   #14
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Default Re: 2 metre Yagi antenna

Quote:
What's going on in W.Yorks on 2m now
More if people do it, like Wendy.
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Old 4th Jul 2021, 9:19 am   #15
Malcolm T
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Default Re: 2 metre Yagi antenna

Where can i look at up to date predictions / conditions for sporadic E and tropo for vhf please .
I have tried DX maps are there any others ?.
I am trying to get up on 2mts for ssb.
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Old 5th Jul 2021, 9:32 am   #16
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Default Re: 2 metre Yagi antenna

For tropo, try the "Hepburn Tropo forecast". Our locked down works IT won't let me go there to get a link for you (thinks it is something to do with watching TV!). A google search for 'Hepburn Tropo' should find it.

On the landing page there is an easily missed small dropdown box, upper left, to select the region you want look at.
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Old 5th Jul 2021, 3:15 pm   #17
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Default Re: 2 metre Yagi antenna

Here it is... https://www.rfcafe.com/miscellany/ho...-Forecasts.htm
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Old 5th Jul 2021, 6:52 pm   #18
Steve G4WCS
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Default Re: 2 metre Yagi antenna

Hi Wendy. The DK7ZB designs are reliable and repeatable and lend themselves to repurposing other antennas. I made a 5 element from a moonraker 2m yagi that had an awfully implemented gamma match. Used 75 ohm ct100 for the matching transformer

Designs here


https://www.qsl.net/dk7zb/start1.htm

You could probably use what you cut off the loop driven element to make another parasitic element.

Can also recommend the lfa designs. Ive a 7 element on the main mast
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Old 7th Jul 2021, 7:01 am   #19
Malcolm T
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Default Re: 2 metre Yagi antenna

Thank you for the Tropo pages.
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