UHF problems

Submitted: Monday, Apr 24, 2006 at 13:15
ThreadID: 33184 Views:1890 Replies:7 FollowUps:2
This Thread has been Archived
I run a Uniden Sundowner unit in my 4.8 Patrol. I have had no issues for the first year or so untill recently there seems to be a lot of interferance in transmitting while driving at speed. Receiving seems to be unaffected but at highway speeds a vehicle about 50m ahead cannot hear my voice. At the same distance between vehicles but travelling at around 20km/h the communications are crystal clear. Can anyone offer some advice on how I can solve this one ?
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Reply By: Voxson (Adelaide) - Monday, Apr 24, 2006 at 13:32

Monday, Apr 24, 2006 at 13:32
Is it possible your antenna has a break internally?...
Or a bad connection on the base?...
AnswerID: 168703

Follow Up By: rooscoota - Monday, Apr 24, 2006 at 13:35

Monday, Apr 24, 2006 at 13:35
hey hey g'day

yup, sounds like new antenna time to me also....

____________________________________________________________________

lifes a garden........ dig it

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FollowupID: 424093

Reply By: Cornelius - Monday, Apr 24, 2006 at 13:37

Monday, Apr 24, 2006 at 13:37
I have checked the connections and they seem OK , the antenna is one of those two piece ss wire ones and appears to be OK.
Could it just be time for a new unit ? I'd hate to replace the thing every two years though ............
AnswerID: 168704

Follow Up By: howie - Monday, Apr 24, 2006 at 13:48

Monday, Apr 24, 2006 at 13:48
you probably need to test it with an s.w.r. meter first, then go from there.
last time i looked at an u.h.f. meter,they were pretty cheap .
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FollowupID: 424094

Reply By: Cornelius - Monday, Apr 24, 2006 at 13:50

Monday, Apr 24, 2006 at 13:50
Thanks for the tip ! Will try that .....
AnswerID: 168708

Reply By: Kiwi Kia - Monday, Apr 24, 2006 at 17:08

Monday, Apr 24, 2006 at 17:08
As already said - check your wireing to the aerial. The earth connection often corodes and does not make a good connection.
AnswerID: 168727

Reply By: Michael Carey - Monday, Apr 24, 2006 at 18:43

Monday, Apr 24, 2006 at 18:43
It's possible your radio is suffering from something called microphonics.
This is where vibration from the vehicle eg. road, transmission, engine is transfered to the radio via it's bracket and makes components in the radio vibrate. This can then affect the transmitted audio. A quick check is to remove the radio from the bracket and support it without direct physical connection eg with a cushion or towel. You might need to get some help from someone for this test. You can even tap the radio while transmitting and see if the people on the other end can "hear" the tapping.
If the interference goes away during this test then it's a trip to the service shop to fix the problem.
How is the UHF mounted? Does it get hot? Some Uniden radios have a small wax filled metal box which contains vibration sensitive components. If the radio gets hot, this wax can melt and move away from where it should be. Radios mounted in dash pods suffer badly from heat related faults.
AnswerID: 168744

Reply By: Member - Vincent A M (NSW) - Tuesday, Apr 25, 2006 at 09:03

Tuesday, Apr 25, 2006 at 09:03
Have simular problem some times with the same unit

The problem i find is that the mic lead has come loose & needs a clean & tighten
& works well for mounths again
AnswerID: 168848

Reply By: Cornelius - Wednesday, Apr 26, 2006 at 10:57

Wednesday, Apr 26, 2006 at 10:57
Many thanks to you guys that took the time to respond ! Looks like a little Saturday morning mission will be coming up this week.

AnswerID: 169047

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