Jump to content
  • 0

Repeater antenna separation



I'm planning a new antenna system and mast for my repeater.

Got it in my head, that I want to try separate tx / rx antennas. Vertically 

So, I've looked up the charts and used the CommScope antenna separation calculator.

Vertical separation would be 20' - (70db).  Which is ok... My rx antenna would be 45' and my tx antenna would be 25'. 

But does that take into account the isolation I have at the transmitter? 

I have 3 1db wacom  cans on the rx side 

2 wacom 1db cans on the tx side,  plus a circulator.

I will lose 80db without my duplexer. But I can make that up with some more band pass / band reject cavities.

So, can I move the tx antenna a little higher up on the mast and make up iso db's at the transmitter,

Also my tx antenna will be 6dbd and my rx antenna will be 1/2 wave stacked completely vertical. 

Please and thank you for any help





Link to comment
Share on other sites

1 answer to this question

Recommended Posts

  • 0

Thats an awful lot of equipment and feedline for a UHF repeater at 45' off the ground. Are you on a 5000' mountain ? If not I dont see why a decent duplexer would't work better than trying to be separate antennas. Normally when separate antenna's are used its adding multiple TX and RX channels to a system. For a single GMRS/ UHF repeater I'd just use a duplexer and a single antenna. 

What is the reasoning of using 2 antenna's vs one ? 

Link to comment
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.

Answer this question...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

  • Create New...

Important Information

By using this site, you agree to our Terms of Use and Guidelines.