Hey OM:

Here I thought this was the homebrew forum. The separate antenna is the easy way out,

I'd go with sum pin diode switching and a frequency sense circuit to switch the pin diodes. Or there are some good mercury wetted relays out there that can handle 100 watts.


On Thursday, December 6, 2012 4:15:39 AM UTC-5, David Griffith wrote:
In order to connect a 2m/70cm radio and a 1.25m radio to a triband

antenna (2m/1.25m/70cm), one requires a triplexer and diplexer. I'd

like to cut down on the number and size of equipment to do this.



I asked Comet about making a single compact unit that takes 2m/70cm on

one port and 1.25m on the other. Mick Stwertnik told me that they

designed and specced it out, but the cost would be a prohibitive

$200-ish.



So I investigated making my own and found Jim Tonne's Diplexer program.

I asked him if he could extend the program to allow for designing

triplexers. He had some hackish solution that sort of worked, but he

doesn't know the math to do it correctly in the first place.



Where should I go from here?



--

David Griffith

--- Put my last name where it belongs