[BC] Diplexing an AM antenna.

[Ronald J. Dot'o Sr.]

Hi Gang,

I'm about to take on a job I've never done before and would be grateful for 
any advice.

I'm under the impression that a diplexer is like a double ATU with filter 
traps to couple each station to the tower while rejecting the other station 
from the respective transmitter's output.

Is it very different from tuning a single ATU for each respective station?

Any suggestions on who to get the diplexer from?  Do they usually provide 
detailed tuning instructions?

The frequencies are 1220 and 1490, both 1 Kw. class C's.  I don't know what 
the tower resistance is yet.

Thanks for any help,

Ron D.