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Old June 26th 06, 10:21 PM posted to rec.radio.amateur.antenna
David G. Nagel
 
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Default low power FM TX and multiple antennas?

MRW wrote:
Greetings.

If we are using one low power FM transmitter and we want to use a 2-bay
FM antenna configuration, will using a power splitter at the
transmitter output be sufficient?

The FM TX utilizes a type N connection to the FM antennas. .... So if I
split the power output and just have two outputs to handle each of the
two antennas, then that would work right?

What other considerations should I have in mind? Do I need to worry
about phasing issues?

Thanks!


You need to move the splitter closer to the antennas in order to save
power losses. You you need to worry about phasing but that is taken care
of when you run the coax from the antennas to the splitter cut the coax
to approx. 1/2 wave. See the ARRL antenna book.
You will have a change in impedance in this configuration from the
splitter to the antennas. Look at about 70 ohms to the antennas and use
50 ohms from the transmitter to the splitter.
I am sure that other helpful assistance will be forthcoming from others.
Turn your BS filter on.

Dave WD9BDZ
 
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