[Moon-net] 10GHz Polarisation

[Chris Bartram]

Can we not let the discussion regarding circular/linear polarisation turn into 
a crusade! Although instinctively I feel that CP is the right choice, 
particularly as activity (hopefully!) increases around the globe, and the 
Eu/NA axis becomes less important, the arguments of the advocates of the 
retention of the current polarisation standard are also quite convincing. We 
need to examine the advantages and disadvantages of a change in a 
dispassionate way.

When I get a few hours, I will analyse the available test results and look for 
things like evidence of poor circularity. It's not _that_ difficult to do! As 
Brian, G4NNS, has said, we need more information, but that means that future 
tests need better planning. Unfortunately, there are few stations with 
facilities like calibrated adjustable linear polarisation. In my case, it 
would be a _lot_ easier to go circular than to arrange adjustable linear 
polarisation...

Can I echo (pun intended!) Brian's other comment. If you are interested in 
joining us on 10GHz, don't let these discussions about polarisation put you 
off! If you can find the Moon with a 1.8m or larger dish on 10GHz, and you 
have a tropo system which runs >10W with a reasonable receiver, you should be 
able to make some contacts, particularly around perigee. Come and join us!

As for 24GHz and up - at least there's not the temptation to try to use coax 
systems on those bands!!

Vy 73

Chris
GW4DGU