A crossed Yagi for 255 mHz. SatCom

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VE3EAR
Posts: 36
Joined: Sat Oct 05, 2019 10:13 pm

A crossed Yagi for 255 mHz. SatCom

Post by VE3EAR » Mon Nov 25, 2019 3:49 pm

I built this crossed-Yagi RHCP antenna last week for listening to the pirates on SatCom CONUS.

73, Bruce, VE3EAR
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SatCom Yagi1.JPG
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Username
Posts: 602
Joined: Sun Oct 09, 2016 7:27 am

Re: A crossed Yagi for 255 mHz. SatCom

Post by Username » Mon Nov 25, 2019 6:20 pm

You understand Portuguese?

VE3EAR
Posts: 36
Joined: Sat Oct 05, 2019 10:13 pm

Re: A crossed Yagi for 255 mHz. SatCom

Post by VE3EAR » Wed Nov 27, 2019 2:17 am

You understand Portuguese?
Nope....but I have a friend with an app on his smart phone that does!

73, Bruce, VE3EAR

fresnoboy
Posts: 6
Joined: Thu Jun 14, 2018 4:56 pm

Re: A crossed Yagi for 255 mHz. SatCom

Post by fresnoboy » Thu Jan 02, 2020 4:01 pm

Neat... can you outline what you started with and what you did to make it work? I’d be interested in doing the same if it’s not that hard...

Thx
Mike

USAFE501
Posts: 12
Joined: Fri Mar 29, 2019 11:11 pm

Re: A crossed Yagi for 255 mHz. SatCom

Post by USAFE501 » Fri Jan 03, 2020 3:33 am

Morning,
Antenna in photo looks good - I have a Military version (Quick deploy - 60 sec set up/tear down) that fits neatly into a small bag no bigger than one of those tins of peanuts you get.
I see them for sale on ebay for anything up to £700 !!! ....yours looks almost identical in design.

Not sure what you will hear, unless as mentioned, you know your Portuguese, but the voice volume level and excitement was tremendous during the last Football World Cup !!!!!!!!!

Have heard a few clear voice comms from US Military that occurred in error...there used to be a website that logged 250mhz comms called Solarix however the last entry was dated Sept 2018 , still makes interesting reading and listening as many of the posts on there have sound recordings attached... (solarix.net or similiar I think ?)

Thanks
K :D

Username
Posts: 602
Joined: Sun Oct 09, 2016 7:27 am

Re: A crossed Yagi for 255 mHz. SatCom

Post by Username » Fri Jan 03, 2020 8:41 am

I have a Military version
The Trivec?

Does the (US) Military use UHF?
I know there are 2 other Sat, System 2 Sat from the Germans "Comsat BW" and from the Italians there Sicral.

VE3EAR
Posts: 36
Joined: Sat Oct 05, 2019 10:13 pm

Re: A crossed Yagi for 255 mHz. SatCom

Post by VE3EAR » Sat Jan 04, 2020 4:12 am

Neat... can you outline what you started with and what you did to make it work?
I built the antenna from materials I had on hand. I used an on-line Crossed-Yagi calculator, not sure which one, to get the measurements for element lengths and their spacing on the boom. The most difficult part of the build was fabricating a lumped-element Wilkinson Combiner that the two driven elements are connected to, via RG-6 of half-wavelength for one, and three-quarter wavelength for
the other, to get the required right-hand circular polarization.

73, Bruce, VE3EAR

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