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Vertex VXR-7000 UHF OPENS NEARBY RADIOS

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tiredretired

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As soon as this repeater is powered on all nearby radios that are programmed on the same freq pair there RX lights come on Indiacating receive. The repeater appears to be transmitting some sort of signal without the transmitter being keyed. I checked RF power output from the antenna connector an# there no power output. Everything works great, RX good, TX output good, just this crazy issue????
 
WA0CBW

WA0CBW

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I believe this has been discussed here before. Essentially the TX local oscillator runs all the time instead of only when the transmitter is keyed. Don't remember if there was a solution. Maybe someone else here can provide additional information.
BB
 
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tiredretired

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Any help or guidance would be appreciated. I changed out the capacitors in the PA thinking it was a filtering issue. The reply must be correct about running all the time because as soon as I unplugged the transmitter board the condition stopped. I thinking maybe the crystal needs to be replaced???? HELP NEEDED
 
cmdrwill

cmdrwill

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WA0CBW said:
Essentially the TX local oscillator runs all the time instead of only when the transmitter is keyed. BB
Click to expand...

Exactly. Nothing wrong with your repeater. The repeater runs the TX VCO, "transmitter local oscillator", all the time so the transmitter has a fast 'turn on time' . You already have the Tone squelch on your radios you wont hear the TX VCO. And you probably will get the busy indicator, this IS normal for that and many other repeaters.

The TX VCO is a phase lock loop so it does have some 'turn on time' so to eliminate the turn on and lock up time it stays on all the time. The "signal" is not very strong and does not even get to the repeater antenna. So when you and you handheld radio get away from the repeater your radio will not 'hear' the TX VCO.
 
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tiredretired

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Only This Repeater Does This

I have 5 of these Vertex VXR-7000 UHF Repeaters and I have sold 4 or 5 others and they did not do this. It's a problem because the HT' s are many times within blocks to the repeater and there receive lights are on and then they can't Scan. One person purchased it and soon returned it. I don't blame them because it is an nagging condition.
 
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