Christchurch Repeater Ideas
I wanted to put a page together with some ideas on how the RF part of the ZL3AC ATV repeater could be improved / developed. I'm not saying that any of these ideas are perfect, this page has been put together as the start to discussing ideas.
The top diagram is the current design of the repeater.
The second diagram could be a 'half way house' between the current design and further improvements. Here the video and sound carriers are mixed up to the final frequency separately, hopefully reducing any unwanted mixing product between the video and audio carriers. The only non-linear products will come from the PA.
The last two diagrams are essentially the same. Both use separate PAs for the video and sound carriers. The third diagram combines the signals to use a single antenna, while the last diagram uses to antennas.