This forum is run by the BATC (British Amateur Television Club), it is service made freely available to all interested parties, please do not abuse this privilege.
until they lost their site. I even worked DL on SSB with 10 watts with it.
- 8132018143412.jpg (182.84 KiB) Viewed 3642 times
*** 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
Try media player in your search; there are loads about and it's what I use.
https://www.ebay.co.uk/itm/Full-HD-1080 ... SwUchaBB~n