Beginners antennas

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G4GUO
Posts: 665
Joined: Tue Feb 16, 2010 12:51 pm

Beginners antennas

Post by G4GUO » Wed Mar 09, 2011 10:32 am

Hi,

Does anyone know where it is possible to get a low gain antenna for 24 cms
suitable for simple home construction / inexpensive. I am trying to get some of
my locals interested in ATV on 24. Getting hold of a Freesat box is not
a problem but getting hold of a simple antenna to plug it into is.

- Charles G4GUO

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gm1mfn
Posts: 68
Joined: Tue Sep 09, 2008 12:32 pm

Re: Beginners antennas

Post by gm1mfn » Sat Mar 12, 2011 11:16 pm

Would an Alford Slot be any use?
Doppler effect: The tendency of stupid ideas to seem smarter when they come at you rapidly.

G4GUO
Posts: 665
Joined: Tue Feb 16, 2010 12:51 pm

Re: Beginners antennas

Post by G4GUO » Sun Mar 13, 2011 8:00 am

I was really looking for a simple (really cheap) antenna to get people started.
(I need an audience for my transmissions!)
There is a guy selling a bunch of 16 ele Comet Yagis on eBay at the moment
for £35 each item nr 170603715687 that is the closet I have come so far.

- Charles G4GUO

M0DTS
Posts: 462
Joined: Sun Feb 24, 2008 9:03 pm

Re: Beginners antennas

Post by M0DTS » Sun Mar 13, 2011 10:58 am

Hi Charles..

Good luck finding something, i have never seen anything like that unfortunately... the only thing was the sevenside antennas.
My first antenna was home brew loop yagi as there was nothing available then (~10 years ago)

A old sat dish with ring feed will work fine at 23cm, maybe that's a bit big though..?!
A horn made from a large tin?

13cm has much more available but far more interference due to that!

Rob
M0DTS

G4GUO
Posts: 665
Joined: Tue Feb 16, 2010 12:51 pm

Re: Beginners antennas

Post by G4GUO » Sun Mar 13, 2011 3:38 pm

Hi Rob,
Probably the cheapest solution will be to use a piece of double sided PCB for the transmission line
and soldering 14 SWG elements onto it. I have seen that done with an LPA but I assume one could
do something similar with some phased dipoles then tape that to an upstairs window. I will have to have
a think about it.

- Charles G4GUO

M0DTS
Posts: 462
Joined: Sun Feb 24, 2008 9:03 pm

Re: Beginners antennas

Post by M0DTS » Mon Mar 14, 2011 11:01 am

Yes that would be quite neat.
Watch out for the new pilkington K windows, they reflect RF very well at the higher bands!

A year or so back i had a 10GHz (ssb) qso with Eddie G0EHV via rain scatter, I am south of him and so was the the rain storm.
Eddie had his east facing window open at 45deg and was reflecting the 10G signals (with the tx in the shack) off down the side of his house into the rainstorm then down to me!

that was a very interesting qso!

Rob
M0DTS

G4GUO
Posts: 665
Joined: Tue Feb 16, 2010 12:51 pm

Re: Beginners antennas

Post by G4GUO » Tue Mar 15, 2011 8:49 am

Hi Rob,

I managed to get diverted 'again'. 10 GHz ATV, apparently there has been some
activity locally on 10 GHz Digital ATV so I will have to investigate that next. I do have
some narrowband gear so I can re-use the WDG PA etc. I also have a YIG (8 - 9 GHz)
I bought a while ago so I can generate a synthesized LO signal and inject that into a
satellite LNB instead of the DRO. Not sure what to do about the tx side yet.

All play and no work!

- Charles G4GUO

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G0NMY
Posts: 79
Joined: Wed Nov 11, 2009 6:10 pm

Re: Beginners antennas

Post by G0NMY » Sat Apr 09, 2011 11:25 pm

Here is a PDF file with a design for a wideband 23/24cms atv antenna By G8CKN
Might be worth building a few?

http://dl.dropbox.com/u/22562965/yagi.pdf

Also design of cheap hairpin yagis for many different bands simple to build.
http://dl.dropbox.com/u/22562965/cheapyagi.pdf

HTH
Cheers Mark GØNMY
http://www.g0nmy.blogspot.co.uk/

¡ʎɐqƎ ɟɟo pɹɐoqʎǝʞ ɐ ʎnq I ǝɯᴉʇ ʇsɐl ǝɥʇ sᴉ sᴉɥʇ

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