[amsat-bb] antenna for 1.2 Ghz

[Chris Thompson]

There is more than one M2 antenna.  I have had good success terrestrially
with the shorter antenna.  The elements are stamped from a single piece of
metal, so it is simple to put together and you can't get the element
spacing or alignment wrong.  It is rear mount if that is an
issue/advantage.  DX Engineering will ship it to you rapidly:

https://www.dxengineering.com/search/department/antennas/part-type/vhf-uhf-beam-antennas/product-line/m2-antennas-23cm22eza-1296-mhz-yagi-antennas?autoview=SKU&N=4294953330%2B4294952638%2B4294948220&sortby=Default&sortorder=Ascending

On Mon, Aug 27, 2018 at 9:57 PM Mac A. Cody <maccody at att.net> wrote:

> I'll also add in my recommendation to build.  For 2018 Field Day, I built
> a Kent Britain WA5JVB 1296 MHz Cheap Yagi.  The plans can be found in the
> PDF document https://www.wa5vjb.com/yagi-pdf/cheapyagi.pdf.  It was easy
> to construct, if you are careful.  Without tuning, I was able to get a
> 1.25 SWR on transmit frequency for AO-92 in L/v mode.  I was able to make
> two successful QSOs during the one decent pass, for my location on Field
> Day that AO-92 was in L/v mode.  Unfortunately, that pass occurred before
> Field Day officially started.  Anyway, I felt validated that the antenna
> worked!  Give it a try!
>
> 73,
>
> Mac Cody / AE5PH
>
>
>
> On 08/27/2018 05:19 PM, Greg D wrote:
> > Add in my recommendation for building your own.  I made one with some
> > old aluminum Radio Shack "ground wire" that I had laying around.  Follow
> > the calculator for radius and spacing as best you can, but don't sweat
> > over the super fine detail.  Helix antennas are inherently forgiving in
> > construction, and are nice that they are circularly polarized which
> > helps when working a spinning satellite.  Both traits are in contrast to
> > building a Yagi beam.
> >
> > Anything inside the helix is invisible to the antenna; I used an
> > aluminum rod, and heavy zip ties out to the wire turns.  Tie one end
> > around the central support, then use another (smaller one) to attach the
> > wire to the "tail" of the first.  Don't need to support every turn; just
> > use enough to keep things kind of in place.
> >
> > Greg  KO6TH
> >
> >
> > Zach Metzinger wrote:
> >> On 8/27/18 2:28 PM, Philip Jenkins wrote:
> >>> Does anyone have recommendations for another brand, or have an
> >>> appropriate
> >>> one for sale? (I wish I had bought some of those loop yagis which were
> >>> prominently displayed in Ball Arena at Hamvention in the early 90s...)
> >> You might also try this home-brew model:
> >>
> >> https://www.mictronics.de/2011/07/1240mhz1280mhz-diy-helix-antenna/
> >>
> >> --- Zach
> >> N0ZGO
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> > to all interested persons worldwide without requiring membership.
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> > are solely those of the author, and do not reflect the official views of
> AMSAT-NA.
> > Not an AMSAT-NA member? Join now to support the amateur satellite
> program!
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>
> _______________________________________________
> Sent via AMSAT-BB at amsat.org. AMSAT-NA makes this open forum available
> to all interested persons worldwide without requiring membership. Opinions
> expressed
> are solely those of the author, and do not reflect the official views of
> AMSAT-NA.
> Not an AMSAT-NA member? Join now to support the amateur satellite program!
> Subscription settings: http://www.amsat.org/mailman/listinfo/amsat-bb
>


-- 
Chris E. Thompson
chrisethompson at gmail.com
g0kla at arrl.net