[Two radios on one antenna]

On 6/14/2022 at 10:04 PM, tinaeuc said:

I’m adding a screen room onto my radio shed and want to have a radio in it.

I don’t want a switch I want to listen on both radios but TX on one at a time.

This is for 2 GMRS radios. Inside will be a BTECH 50x1 and In the screen room will be just the face plat of a Motorola MCS 2000.

Any help would be much appreciated.

Thanks in advance 

So I had to go with a switch..

only one radio at a time to listen and transmit.

thanks for all the help.

[Two radios on one antenna]

On 6/15/2022 at 12:17 AM, wayoverthere said:

Diamond rates this one at .1 db insertion loss, and 60db of isolation between ports.

https://www.dxengineering.com/parts/dmn-cx210a

I have one on my desk currently; when my faltering btech gets retired, I'm planning to drop it in between the diplexer and my uhf radio, so I can switch between the feed to the dual band ham antenna (comet gp1), and the gmrs antenna (Midland 3db whip)

Thanks I think this will do.

[Two radios on one antenna]

1 hour ago, WRHS218 said:

I used one of these, MFJ-1702 2 Position Antenna Switch, for that purpose a long time ago. GigaParts has them for around $40. I am sure there are other brands and venders out there.

How much loss did you have?

[Two radios on one antenna]

7 minutes ago, WRKC935 said:

If you are wanting to have two or more radios on a single antenna you are out of luck..... you need two antenna's one for transmit and one fore receive... If you are willing to run 2 antenna's you can run a control station combiner that allows you to run as many radios as it has ports.  4 is usually the minimum but 8 is more common and they can be expanded to 32 ports which is the largest I have seen. With tow antenna's. 

Now the pricing isn't for the faint of heart, typically about a grand per port on the smaller ones and can get down to 500 per port on the larger units.  Plus of course the two antenna's required.  Signal loss though these is pretty high as well.  Looking at 6 dB both directions.  SO a 50 watt radio will have 12.5 watts out, but it's typical to turn the radios down to 20 watts so you are looking at 5 watts out.  Incoming signal is also 6dB down so you need to be fairly close to the repeaters you are talking to.

 

Thanks.

If I use a simple T- switch only one radio at a time then I should have no problem?

is there a high end switch with little to no loss?

just for info I’m using 50 foot LMR-400UF and a comet CA-712.

Thanks for your help.

[Two radios on one antenna]

I’m adding a screen room onto my radio shed and want to have a radio in it.

I don’t want a switch I want to listen on both radios but TX on one at a time.

This is for 2 GMRS radios. Inside will be a BTECH 50x1 and In the screen room will be just the face plat of a Motorola MCS 2000.

Any help would be much appreciated.

Thanks in advance 

update……

I changed my mind and I will only be listening and transmitting on 1 radio at a time.

Thanks for all the help.