Portsdown wiki update

[g8gtz]

There have been some updates and additions to the Portsdown wiki pages.

The Power amplifier page https://wiki.batc.tv/Power_amplifiers has been updated to show what happens when you try to run an amplifier close to it's rated output on DATV - it's not nice! There is some also advice what to do (and not) with amplifiers and the Portsdown transmitter - please let us know of any experiences / tips / ideas you have so we can share with everyone.

We have added information on the filters page https://wiki.batc.tv/Filters - this page talks about the need for different types of filtering on BOTH Transmit and receive and each band now has a page linked from this page. If you have any filters that you have used please add them to the wiki or let us know and we will.

Finally we've added a Portsdown community page https://wiki.batc.tv/Portsdown_community where we have announced a couple of competitions, special Portsdown awards for the June ATV contest and a list of rallys where we will be holding Portsdown clinics.