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Antenna repeater upgrade help

kb4mdz

Member
Joined
Apr 28, 2003
Messages
305
Location
Cary, NC
If your ground units can hear the repeater at all times, increasing repeater power won't help. It appears your problem is the repeater hearing your ground unit handhelds. The fix for that is get the equipment a tune up, make sure the antenna, feedline, duplexer and receiver are working top notch (why leave performance on the table), then if you are replacing you need to get the antenna higher or add additional receive sites.
Yes, this.

You're experiencing a 'talk-in' problem, not a 'talk-out' problem. And high site noise or site noise generated by the transmitter energy impinging on nearby rust junctions, etc (and this is just 1 of the problems that can crop up), and many other factors can kill your talk-in sensitivity.


"Repeater Site Sensitivity Test" is the phrase your looking for.

Yes, some basic tests of repeater RX Sensitivity, TX power & modulation, VSWR, site sensitivity, antenna & feedline sweep would give you an understanding of your current baseline performance. That will give you a chance to know what kind of improvement you really get with the new equipment.

Others have said it right, if someone in your org tells you something can't be afforded, you need that answer in writing. Cover year... head.

(You're in for a slog, friend, and if it doesn't work out, you might have your resume updated and circulating for a quick exit. )
 

W4EMS

Member
Premium Subscriber
Joined
Dec 19, 2002
Messages
755
Location
Middle Tennessee
Any thoughts on using remote receivers for the dead areas once you have determined where they are? I know of a couple ham sites that do that using a comparator to select strongest input for repeating.
 

kb4mdz

Member
Joined
Apr 28, 2003
Messages
305
Location
Cary, NC
Any thoughts on using remote receivers for the dead areas once you have determined where they are? I know of a couple ham sites that do that using a comparator to select strongest input for repeating.
Voted receivers will add at least an order of magnitude of complexity what with siting, coverage modeling, testing, and such. The idea has definite merit, but is fraught with its own issues. FWIW, JPS comparator/voter boxes are great!
 

mmckenna

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Joined
Jul 27, 2005
Messages
18,039
Location
Pt. Nemo
Any thoughts on using remote receivers for the dead areas once you have determined where they are? I know of a couple ham sites that do that using a comparator to select strongest input for repeating.
Yes, common in the LMR industry, but expensive. Plus, you would need fairly reliable backhaul. The initial buildout costs can get pretty high, plus your ongoing support costs increase.
If the site worked fine at one time, it may be cheaper to find and fix the issue. With the right knowledge and test equipment, there's the real possibility that this could be a really simple fix.
 
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