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until they lost their site. I even worked DL on SSB with 10 watts with it.
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*** And the great news is that it seems unaffected. 1 minute in a 800 watt microwave with a cup of water, plastic came out stone cold. So it seems suitable for RF....how much of a helical would be good for an uplink? I can search for existing designs or possible do the cad to enable reliable replication. **
There's some info here on a helical feed for offset dishes: http://www.g6lvb.com/60cm.htm
Around 5 turns seems to be optimum, but if the framework could support 6 turns, it would allow for experimentation. I wonder if it could be made so that it could attach to the standard 40mm LNB holder?
There's more info here, including a design for prime focus dishes: http://www.w1ghz.org/antbook/conf/Helic ... tennas.pdf
ISS and Es'hail-2 use RHCP, so the helical feed should be left hand to allow for the reflection off the dish face: anti-clockwise when viewed from behind the ground plane.
Select Band=C and Country=United Kingdom and click on the dot at the centre of the circle to get the frequency. It might explain some de-sensing if you're near one or beaming at one.
http://eumetnet.eu/wp-content/themes/ae ... index.html