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Motorola SLR 8000 repeater not communicating with walkie-talkies issue

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Gooms

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Oct 28, 2023
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Please i recently purchased two motorola SLR VHF repeaters and after programming it i tried communicating through the repeater using walkie talkies but the walkie talkies wouldn't communicate with each other unless they're directly in front of the repeater and if i take a step away from the repeater i wouldn't be able to use the walkie talkies again. please does anyone know the cause of this problem or how i can fix the issue on the repeater. I've tried getting the codeplug for the repeater but all my attempts to contact motorola has failed. please how do i fix this issue? i need help.
 

Gooms

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Do you have a duplexer ot two antennas? If you dont have a duplexer you would need one antenna for transmit and one for receive spaced as far apart as possible
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I am using two separate VHF antennas one for transmit and one for receive. I'm carrying out ground testing now so the antennas have not yet been rigged up to the mast. but at that, the walkie-talkies are supposed to be able to communicate with each other at a close distance.

And that would need to be vertical separation, not horizontal. And at VHF frequencies that would need to probably be 60’ at a minimum.
the frequencies I'm using for the repeaters are RX: 145.250, TX: 140.250, and no tone. also, the firmware version of the repeater is an old version "R02.07.08.02" I don't really know if that's a factor contributing to the issue.
 

davidgcet

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you are experiencing desense and receiver blanking, the transmit is overloading the receive and killing it, that is why the above advice is given. put the repeater on a couple dummy loads, a small one is fine for the RX but the TX needs to be rated for at least the amount of power out.
 

davidgcet

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btw, with VHF the portables can have blanking anytime they are too close to a high power signal. i've seen it many times where a portable would be deaf when a nearby control station would key up. only solution is to raise the antenna or make it so the portable is not in the strongest part of the field. heck even mobiles will have it, 2 vehicles next to each other and when 1 keys up the other never hears it because the signal is just too strong.
 

Firebuff880

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Location
Boynton Beach, FL
I've tried getting the codeplug for the repeater but all my attempts to contact motorola has failed. please how do i fix this issue? i need help.

Motorola will not have your code plug -- You build and set them in both the repeaters and subscribers.

R02.07.08.02" I don't really know if that's a factor contributing to the issue.

It absolutely could be if your new subscribers came with current firmware and have the Inband talker alias or GPS options selected. Or you have a mismatch in any number of other settings.

I would get a Motorola Dealer involved.
 
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