[BC] 50 ohm load

[Ronald J. Dot'o Sr.]

From: "Thomas G. Osenkowsky" <tosenkowsky at prodigy.net>

> Don't forget that you have non-concentric hardware
> in the RF contactor. Unlike an FM switch, you no
> longer have a true 50 Ohm system throughout. Just
> consider all of that as part of the system when you
> tune for the optimum sideband rotation at the tx
> output terminals. B.E. should be able to provide you
> with what the best load is there. It may NOT be
> symmetrical at that point!
>
> Tom Osenkowsky, CPBE
>
OK, let me ask this question from a different angle.

You've just taken over a station with a AM-1A loading into a BE
matching network (which was later stolen in a break-in) which loads
into the ATU through an RF contactor and the backup Gates 1 is dead,
and the station has a lousy signal coverage.

When you run the TX directly into the ATU without the network the TX
goes into foldback, but you think that the ATU can be retuned for a
good match rather than relying on the network to match the mismatch
and therefore improve the efficiency of the system.

What would you do clean up that mess?

Another question that I have is will someone please explain "Rotation"
to me.  Other than the electronics that the AF taught me a lot of my
Broadcast experience has been OJT or self-taught and "Rotation" hasn't
been part of it.

Thanks,

Ron D