Hello David

I made myself a 23cm cross yagi(2*19el) which worked FB for uplink AO-51.The measurements where exactly as designed.Elements are spaced 1/4L between H and V, i spent most off the time in the element cutting,feeding the DR was right on the first timewith 2*1/4L 75ohm coax. It is RHCP.The same design i used for my 8*32el years ago. So if you are in the possibility to make yourself an antenna, try it. The SHF design antennes from WIMO are the same, and broadband, but for that expensive price, you can make yourself a few.

73's Jerry,ON4CJQ

----- Oorspronkelijk bericht ----- Van: "David G0MRF" g0mrf@aol.com Aan: amsat-bb@amsat.org Verzonden: Zaterdag 21 februari 2015 12:52:04 Onderwerp: [amsat-bb] L Band antenna recommendations?

Hi

I'm looking for a recommendation for an L band antenna suitable as a groundstation uplink to a satellite in LEO. Does anyone have anything they could check for SWR on 1264 MHz please?

Linear polarisation is fine as the receive antenna will have circular polarisation. Most of the published data I've seen assumes the user will be on 1296.

Any thoughts much appreciated

Many thanks

David G0MRF _______________________________________________ Sent via AMSAT-BB@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://amsat.org/mailman/listinfo/amsat-bb

Hi David,

I rolled my own from the VE3NPC design, and it works quite well and is pretty portable actually. Details and pictures on my website at http://n0jy.org click on the Satellite Antennas tab and you'll find a link to the pdf right at the top of the description paragraph on the satellite antennas page.

It was both fun and fairly easy to build, and I'm a very average builder of anything hardware. I used a 3" piece of PVC pipe as the form to wrap the turns, and if I recall correctly I just used the whole 25 foot roll of copper wire I got from the hardware store so mine is a bit longer than the design calls for. And when I was done winding I saw that I had done it "backward" giving me LHCP rather than the desired RHCP! Must be because I'm right handed and as I said, "average" or perhaps that was overstated. I found that the wire did not like being unwound and rewound so it cost me another roll of wire... :-)

73

Jerry Buxton, NØJY

On 2/21/2015 05:52, David G0MRF wrote:

Hi

I'm looking for a recommendation for an L band antenna suitable as a groundstation uplink to a satellite in LEO. Does anyone have anything they could check for SWR on 1264 MHz please?

Linear polarisation is fine as the receive antenna will have circular polarisation. Most of the published data I've seen assumes the user will be on 1296.

Any thoughts much appreciated

Many thanks

David G0MRF _______________________________________________ Sent via AMSAT-BB@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://amsat.org/mailman/listinfo/amsat-bb