On Sunday, March 15, 2015 at 3:59:22 PM UTC-4, Phil Kane wrote:
On Sat, 14 Mar 2015 10:12:20 EDT, Tom Horne wrote:

I am looking for recommendations for a dual band antenna that will serve
tw
o separate radios. The reason that I want to use a single antenna is th
at
I have a limited number of mounting points for antennas.

One radio will be a two meter packet node which will be used as a Winlin
k R
adio Message Server. The other radio will be a UHF D-STAR hotspot. I a
m w

At the hospital we use a tri-band (144, 222, 440) Comet vertical
antenna fed with a single coax cable, and at the radio end a three-way
splitter and a set of Polyphaser bandpass filters for each radio. That
is necessary because of the high rf environment. Has worked well for
over 10 years.

The dual-band (2m/440) equivalents are available off-the-shelf from
your favorite ham radio supplier (store or on-line).

It sure beats messing around with any of the other schemes reported
here.

73 de K2ASP - Phil Kane

Member, Washington County, OR
Emergency Communications Team
for ARES/RACES and HEARTNET

Station Co-manager - W7PSV / K7PSV
Providence St. Vincent Medical Center
Disaster Communication Team

Phil

How does the use of Polyphaser band pass filters instead of Digital Communi
cations Incorporated band pass filters make your situation different from w
hat I have been asking about here. What would be a tremendous help is for
you to provide the model numbers for the filters you are using there. That
would give us a different manufacturer to turn to for band pass filters co
upled with the knowledge that the models you are using are already working
in a very similar application.

The only difference that is obvious to me is that you appear to only need o
ne transceiver to be able to operate on each of those bands at one time wer
e on two of them I will have a need for two transmitters at the same time.
Between the vertical separation of the two multi-band antennas and the two
MHz separation of the co band operating frequencies I am hoping to make it
work.

--
Tom Horne W3TDH