[NLRS] Dual Band Radio to Seperate Yagi's

[jcplatt1 at mmm.com]

Hi Scott.  If I understand your question correctly, your radio has one RF
port where both 2m and 432 come from.   Your current vertical is probably a
dual band vertical, so this works just fine.  Now you wish to also be able
to run separate 2m and 432 beams.

You cannot simply "T" the 2m and 432 antennas together and drive them from
the one RF port on your radio - this may work for just 2m as the 432
antenna will not be "seen" as too much of a load on 144 MHz, but this will
definitely not work on 432 as the 144 antenna is 3/4 wavelength on 432 and
will load nearly as good as the 432 antenna on 432 .... 432 will be
"screwy".   This is the same physics as to why a 40m dipole also works on
15m.   Yes, you will need a diplexer somewhere along the way to isolate the
two single band antennas from each other.   The diplexer could be up close
to the two antennas so that you only need one long run of coax from the
radio to the two beams.

I'm not sure how the CC dual band antenna gets away with this other than
you can do it but the pattern will be screwy on 432 .... 2m will probably
work OK.

73, Jon
W0ZQ