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VXR-7000 - If the antenna becomes inconveniently deceased?

Joined
Jun 21, 2016
Messages
77
Location
New York, USA
#1
In the event that the relatively cheap antenna (which is all i could afford for now) or the cable going to it becomes damaged, will the repeater die upon transmitting?

If so, would leaving an SWR meter between repeater TX and the duplexor be a good way to protect it?
 
Joined
Dec 11, 2009
Messages
14
Location
Williamstown ny
#2
It wont necessarily die upon the first transmit but if you have an bad part of the antenna system it will A. not transmit the distance it could and B. destroy the transmitter very shortly

Leaving a SWR meter in line does nothing for protection, Its only a measuring device! There is nothing that you can put inline to protect the transmitter from a faulty antenna system with a improper ground plane, ohm mismatch, poor SWR or damage to antenna and/or cable
 
Joined
Jun 21, 2016
Messages
77
Location
New York, USA
#3
I heard that an SWR meter has a load coil or something (i don't quite understand) so if you test an antenna that is bad, the meter would absorb the signal or something so the radios transmitter doesn't burn out. Is that not true?

Also, I did have a Motorola CDM radio who's antenna cable fell out, it didn't appear to be damaged after several attempts to transmit at 50 watts, which is why I was thinking maybe the repeater would have something to protect it since I guess the Motorola did I guess.
 
Joined
Dec 22, 2013
Messages
2,868
#4
I heard that an SWR meter has a load coil or something (i don't quite understand) so if you test an antenna that is bad, the meter would absorb the signal or something so the radios transmitter doesn't burn out. Is that not true?

Also, I did have a Motorola CDM radio who's antenna cable fell out, it didn't appear to be damaged after several attempts to transmit at 50 watts, which is why I was thinking maybe the repeater would have something to protect it since I guess the Motorola did I guess.
A VSWR meter does nothing to protect the radio. It is probably not good to leave one in line on a repeater because the detection diodes might create some nasty IMD interference.

A circulator or isolator between the TX and the duplexer will protect the transmitter. But those should only be used with duplexer having a bandpass cavity or with a harmonic filter, also due to IMD.

Invest in a decent antenna system.

Sent from my SM-T350 using Tapatalk
 
Joined
Jun 21, 2016
Messages
77
Location
New York, USA
#5
I'm hoping over the next couple years (given a little time and money) I will have a proper and professional setup. Right now I'm just trying to do the best I can with what I got.

Thank you
 
Joined
Jun 16, 2013
Messages
3,227
Location
Texas
#6
I've seen several VXR-7000s die due to antenna issues. Unlike some of the more expensive repeaters, the VXR-7000s don't have a high VSWR throttleback. One in particular, a roofer cut the antenna feedline. Within 10 minutes the power amplifier was cooked.
 
Joined
Dec 5, 2008
Messages
1,615
Location
Sonoma, CA
#7
A circulator or isolator between the TX and the duplexer will protect the transmitter. But those should only be used with duplexer having a bandpass cavity or with a harmonic filter, also due to IMD.
I second that. Use a load that will accept your full reflected power. And yes, don't put it behind a simple notch duplexer.
 
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