[BC] Diplexing an AM antenna.

[Mike McCarthy]

This is a no brainer.  Call Ron Rackley and he'll set you up with the right 
design. Have Kintronics build it to Ron's specs. Then have Don Crane  come 
up and do the pre-measurements and then post install tune.. You'll be all 
set now and for when you want to do IBOC.  None of the above are the 
cheapest. But you do get what you pay for with this configuration.  Been 
there done it....twice.

You are correct that there is an ATU first, then the filter networks.  Each 
is designed for that tower only.

1220 is not a graveyarder.  1230 and 1240 are for certain.  I've got a 1220 
here which is a DA-2.

MM

At 07:51 PM 4/30/2007 -0700, Ronald J. Dot'o Sr. wrote
>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.
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