[amsat-bb] Antenna for 1200MHZ for satellites and EME Activity?

[Greg D]

For satellite use (not as likely for EME), I've had good results with a
simple helix antenna.  They are easy to build, and pretty tolerant of
slight inaccuracies in manufacture (much more so than a Yagi).  There
are a lot of designs and calculators for designs on the Web, but I can't
seem to find the one I used for mine.  Ed KL7UW, and Clare VE3NPC, were
great mentors in the process.  If I recall, the key dimensions are
making one turn of the helix one wavelength long, and the pitch between
turns spaced to get a 12.5 degree angle.

Of considerable help in construction, anything that's inside the helix
is pretty much irrelevant to its performance, so long as it doesn't
touch the helix windings.  I used a metal rod, then some zip ties to
support the winding every so often, one thick tie around the rod
extending out, then a small tie to attach the winding to the first tie. 
Some use plastic pegs into a wooden dowel.  Be creative and make
something up.

The reflector and feed point is a flat sheet of metal with an N
connector attached.  Angle the first 1/4 turn at a shallow angle for
impedance matching, and you're done.

Good luck!

Greg  KO6TH


Patrick Leicht wrote:
> Hello Enzo,
>
> I'll try this week a homemade 24 element yagi (DL6WU design). I think this antenna is only for sats an for EME to small with my 10W from the TS-2000X.
>
> 73 de Patrick  (DL3MLP)
>
> -----Ursprüngliche Nachricht-----
> Von: vimone at alice.it <vimone at alice.it>
> Gesendet: Montag 15 Oktober 2018 22:49
> An: amsat-bb at Amsat.org
> Betreff: [amsat-bb] Antenna for 1200MHZ for satellites and EME Activity?
>
>
> Hello,
> please anybody can suggest me an
> array antenna for 1200MhZ for satellites and EME Activity?
> Thanks
>
>
> 73 de Enzo IK8OZV
> EasyLog 5 BetaTester
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>
>
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