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5th October 2023, 03:05 PM
#1
Patrol God
Crazy UHF problems.
I have a Uniden UH7700NB 80 channel that's been in storage for 8 years or so. Stored well, in great condition. I recently fitted it the patrol with a new fairly cheapo maxtrac aerial. Can hear chatter but can't talk out. Tried two other UHFs and they behaved exactly the same. Today I returned the cheapo aerial and got a nice 6db GME. Fitted all up and still have the same problem: can hear workers chatting away but can't broadcast to my handheld.
Weird bits:
If I talk on the handheld and scan with car then the car stops one channel past the hand-held and picks up violent screeching that has a hint of my voice.
If I hit the talk button on the handheld, the "signal received" symbol appears on the car but that will happen no matter which channels either are on.
I have gone through the manual and am pretty happy that all settings are where they should be.
Any tips?
.......from under the great down under.
Hello from Under Down Under!
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5th October 2023 03:05 PM
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5th October 2023, 03:34 PM
#2
Patrol God
I did a factory reset and now it seems to send and receive to the hand held but only if it's one channel apart. Ie handheld on 24 and car on 25 works but not if both on 24 or both on 25? What the heck is going on there!?
.......from under the great down under.
Hello from Under Down Under!
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5th October 2023, 03:56 PM
#3
Patrol God
Sounds as if it is sort of acting as duplex on simplex mode. Maybe?
My advice is: not to follow my advice.
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5th October 2023, 04:40 PM
#4
Patrol God
Originally Posted by
mudnut
Sounds as if it is sort of acting as duplex on simplex mode. Maybe?
It mentions duplex in the manual but I don't fully understand it. It's for use with repeater stations right? So the UHF will display channel 1 but it transmits on channel 31 to the repeater which repeats it as channel 1? Something like that?
The car UHF and handheld will only communicate if the car is one channel up from the handheld. Weird. Also, I could hear some workers chatting, coming out of both uhfs at the same time and one was 20 and the other 21.
.......from under the great down under.
Hello from Under Down Under!
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5th October 2023, 05:13 PM
#5
Patrol God
Originally Posted by
taslucas
It mentions duplex in the manual but I don't fully understand it. It's for use with repeater stations right? So the UHF will display channel 1 but it transmits on channel 31 to the repeater which repeats it as channel 1? Something like that?
The car UHF and handheld will only communicate if the car is one channel up from the handheld. Weird. Also, I could hear some workers chatting, coming out of both uhfs at the same time and one was 20 and the other 21.
.......from under the great down under.
Bear with me, as yours is a different model. I've just got your models online manual.
My advice is: not to follow my advice.
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5th October 2023, 05:18 PM
#6
Patrol God
Yours has basically the same operating system as mine, but I can't find my paper manual. I seem to remember seeing advanced settings to change channel parameters on duplex. Try another factory reset. Being in storage so long, my have let some data be corrupted. @TPC your turn mate.
Are the numbers on the display operating properly?
Last edited by mudnut; 5th October 2023 at 05:38 PM.
My advice is: not to follow my advice.
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The Following User Says Thank You to mudnut For This Useful Post:
taslucas (5th October 2023)
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5th October 2023, 06:06 PM
#7
..........
Duplex should only be on channels 1 to 8 so that shouldn't have anything to do with it. Sounds like one of them has gone a long way off frequency. I can check them, you just have to come up to here, make sure you bring a flynet.
Screenshot_20231005_180359_Maps.jpg
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The Following 2 Users Say Thank You to TPC For This Useful Post:
mudnut (5th October 2023), taslucas (5th October 2023)
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5th October 2023, 08:00 PM
#8
Patrol God
Originally Posted by
TPC
Duplex should only be on channels 1 to 8 so that shouldn't have anything to do with it. Sounds like one of them has gone a long way off frequency. I can check them, you just have to come up to here, make sure you bring a flynet.
Screenshot_20231005_180359_Maps.jpg
I'd love a trip but it might be a bit more cost effective to get one of those icom ic-455 you've mentioned.....
.......from under the great down under.
Hello from Under Down Under!
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The Following User Says Thank You to taslucas For This Useful Post:
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6th October 2023, 09:03 AM
#9
Patrol Freak
Just make sure all of your power connections and earth connections are clean and secure. Even undo the fuse in the fuse holder and give everything a good clean. If there is a bad connection and the voltage to the set is too low they can do odd things, especially when you transmit as it then draws more current and the voltage drops even further.
Worth a try.
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The Following User Says Thank You to BillsGU For This Useful Post:
taslucas (6th October 2023)
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6th October 2023, 10:15 AM
#10
Patrol God
Cheers mate. Yep, checked and rechecked everything. Has a new power supply straight from the aux battery. Fuse checked and cleaned.
.......from under the great down under.
Hello from Under Down Under!
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The Following User Says Thank You to taslucas For This Useful Post:
Stropp (6th October 2023)