metavox at earthlink.net
Mon Jul 9 16:09:56 CDT 2007
I opened my latest copy of RF Design magazine and found an article about
a Doherty amplifier for 900 MHz. This is a good magazine to get and if
you can qualify, it is free.
There were some very fine Doherty transmitters for AM broadcast that
generated 50 kW 24/7. This is a touchy design to get tuned up but once
done, it is very good at amplifying high peak to average ratio signals
and did not require the high power audio modulator.
The article can be found at
George Lemaster can add a lot of info and history of their use with AM
broadcast. As I recall, at least RCA used the design and I think one of
these was installed at WTOP in Wheaton MD.
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