Batboard

Hello from wet old Melbourne, Australia

I have been asked to put together a package for a sporting event that will have 2 capacity plus bases flying to give us 4 cap.plus channels of UHF trunking

Have 2 dr3000's = easy bit
Have 1 useable hole in the plane to mount antenna = getting more difficult
Have 24volts dc at 20 amps = handy

I need some advice on a light weight uhf combiner (470 mhz tx 475 mhz rx) to take the 2 dr3000's into just 1 antenna

We would run the bases only at 5 - 8 watts which I understand makes the whole combiner package a bit easier and smaller

Thoughts on what I should be looking at would be appreciated

TIA
Mike

What sort of weight/space limits do you have? What sort of aircraft is it going in?

Since you're going to need another hole for the rx antenna why don't you just use duplexers on each repeater? Or you're going to have a mag mount inside the plane for RX??? Sounds you could use a combliner.....there I said it

mr.syntrx wrote:What sort of weight/space limits do you have? What sort of aircraft is it going in?

Still to be determined but i have been told 2 x 10 ru rack cases would fit in with a weight limit of around 90 kgs total as it is a 2 seater with cargo bay

The deal breaker is only having 1 antenna for tx & rx and the 2 bases

I have seen multiple repeaters with a combiner and the multicoupler run through a duplexer to get it down to 1 antenna. This add slightly more loss and an additional area of failure. However, I think you could get away with mobile duplexers (small,light,cheap,not great performance) vs. a high performance 6+ cavity duplexer. Just for clarification, you are putting in 2 repeaters correct? You refer to "bases," but it sounds like you are making reference to repeater activity. FB

FatBoy wrote:I have seen multiple repeaters with a combiner and the multicoupler run through a duplexer to get it down to 1 antenna. This add slightly more loss and an additional area of failure. However, I think you could get away with mobile duplexers (small,light,cheap,not great performance) vs. a high performance 6+ cavity duplexer. Just for clarification, you are putting in 2 repeaters correct? You refer to "bases," but it sounds like you are making reference to repeater activity. FB

Hi FatBoy

Yes that is correct, it would be my intention to have 2 repeaters in Capacity Plus Trunk configuration to give me 4 channel trunk capabilities

The deal breaker is that we have only 1 antenna hole on the aircraft so therefore I need both repeaters to tx & rx through 1 antenna