On 9/28/2015 7:23 AM, Jeff wrote:

Why can't the ATU also match the impedance of the cable eliminating
reflections there?

The ATU is only in one location, if it is directly at the antenna feed
point the there is only 1 mismatch to tune out. If you put the ATU at
the Tx end and have a feeder between the ATU and the antenna then the
ATU can do nothing about the mismatch between the antenna and the
characteristic impedance of the feeder; all it can do is make whatever
impedance there is at the Tx end of the feeder acceptable for the Tx.

I wasn't refering to reflections at the antenna. I was referring to the
reflections from the ATU to cable interface. The ATU can match both the
transmitter and the cable, no?

--

Rick