Scanner & Transceiver Multicoupler

[KG5HHS]

Hello Everyone,
Going back to the drawing board, trying to think of a good home antenna solution for my radio's and scanner's. I have been looking at the Stridsbert MCA208M scanner mulitcoupler for my scanners along with a discone antenna. I also have a VHF, UHF, and 7/800mhz (used for NAS, this radio will not transmit) radio's I need to figure out an antenna solution for. I was thinking about putting those radio's on a triplexer and multiband antenna and calling it a day. The radios will hardly transmit as I don't talk often. My concern is that with that setup, is that I will fry the scanners front ends because there is a 99.9% chance I will forget to disconnect them when the time comes to transmit on one of those radio's. Does anyone know of a multicoupler that will handle RF coming into it AND Isolate it from the scanners or any other solution?? Suggestions will be greatly appreciated.

 

[ka3aaa]

put separate antennas up for each radio and be done with it that way you dont need to disconnect anything

 

[KG5HHS]

my concern with that setup is spacing, specifically from the discone antenna feeding the scanners.

 

[mmckenna]

A diplexer/triplexer divides the ports up by bands. If you use one to connect a transceiver and a scanner to a common antenna, your scanner will be deaf on the bands that the transceiver uses.

Two separate antennas with a few feet of spacing is the right way to do this, and still have everything work the way you want.

 

[KG5HHS]

A diplexer/triplexer divides the ports up by bands. If you use one to connect a transceiver and a scanner to a common antenna, your scanner will be deaf on the bands that the transceiver uses.

I was thinking about using the triplexer just for the radios, not the scanners

Two separate antennas with a few feet of spacing is the right way to do this, and still have everything work the way you want.

I won't really have a lot of space to put the scanner discone and radio antenna. the vhf radio will transmit at up to 50watts and the UHF will transmit up to 25watts. How much seperation between the two will be needed. I'm not sure if its worth noting but I will be using something like this mobile to base kit for the VHF/UHF/800mhz radios.

 

[mmckenna]

I won't really have a lot of space to put the scanner discone and radio antenna. the vhf radio will transmit at up to 50watts and the UHF will transmit up to 25watts. How much seperation between the two will be needed. I'm not sure if its worth noting but I will be using something like this mobile to base kit for the VHF/UHF/800mhz radios.

There's a lot of variables involved, so there's no easy answer.
Horizontal separation is good, vertical separation in addition to that will increase the amount of isolation.
I'd start with a few feet of horizontal separation and a few feet of vertical separation.