... More or less finished playing with this little 18GHz - H/V/L/R pol project apart from taking off the temp feed covering due to having a lazer pointer tucked down the feed waveguide whilst aligning the feed up for illumination. It's working surprisingly well to say it's cobbled up from various bits, a home-brew rotory joint, miss-matches on coax adapters etc. I spent a fair while tweeking for best performance and don't think i can improve on it. Did a comparison to see how affective the multi-pol unit was by comparing performance between the two units, a well tweeked Norsat pll lnb fixed in the Vertical pol position looking at the stable 19.2°East Ka Newsnet Comms freq 18561 GHz V and the Multi pol unit, which both are now on the lnb changer on the 1.2 Gibby. The fixed pol has a far simpler signal path with less components in the chain compared to the multi pol unit - see drawing.
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