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forum.funcube.org.uk • View topic - Aerials

Aerials

For the early roll-out of the Dashboard

Moderator: pa3weg

Aerials

Postby g8kuz » Fri Nov 22, 2013 12:48 pm

Hi
Was wondering what aerials, antennas, people are using?
I am using a discone at the moment, seems to work better on low passes than on high passes.
I think a turnstile should be better, or perhaps a QFH.
Does anyone have dimensions/construction details for a QFH at 2mtrs?

Regards
John
g8kuz
 
Posts: 6
Joined: Thu Nov 14, 2013 3:21 pm

Re: Aerials

Postby 2e0sql » Fri Nov 22, 2013 1:48 pm

Hi John,

This topic might be more suitable for one of the general subtopic areas (Mods might be able to move it!).

I'm using Wimo X-Quads at 16ft above the ground,which is about what I can get away with on college campus here in central Oxford antennas are also pretty sheltered from S-SW-N due to buildings being in the way so need reasonably high passes in those directions however the FCD Pro Plus seems to be decoding telemetry on every pass tried :)

I've used QFH antennas for 137MHz APT weather satellite's with great success from this location, I did try a turnstile but never had much luck with mine but of course this might be different for amateur satellites!
Peter, 2E0SQL
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Location: Oxford, UK

Re: Aerials

Postby M0SAT » Sat Nov 23, 2013 10:28 am

Hi John

See

also for an interactive design calculator see

I used to use one on 137 for Wx reception, outperformed turnstiles & discones admirably.

Good luck.

Dave
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Joined: Fri Nov 22, 2013 5:25 pm

Re: Aerials

Postby g8kuz » Sat Nov 23, 2013 4:50 pm

Hi Dave

Thanks for the links.
I think a visit to B&Q to source all the bits is scheduled for tomorrow! ;~)

Regards
John
g8kuz
 
Posts: 6
Joined: Thu Nov 14, 2013 3:21 pm

Re: Aerials

Postby Duncan » Sat Nov 23, 2013 6:17 pm

The measurements at http://jcoppens.com/ant/qfh/calc.en.php are what I used for mine, only I read that one of the loops should be smaller than the other (when viewed from above) so I guessed by how much, and ended up with a QFH tuned to 155MHz (checked with a VNA). So I would say use the figures from that site, but don't bother making one "loop" samaller than the other...

I have to say this was the first antenna I've ever built so I might not know what I'm talking about (although it did decode 18 packets sitting on the ground in the hotel carpark, even though its off tune)

Cheers,
Duncan.
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