On Mon, 03 May 2004 18:51:13 +0100, Andy Hall
wrote:
Channelising filters will help with adjusting everything to equal
level.

Sorry I've never come across a channelising filter...presumably this
would need to fitted in line with the output RF from the twin
modulator? A Google search didn't find any such beast - could you
possibly direct me to a URL for one of these?
What would happen if I didn't use a filter?