GME UHF

Hi all
I have a GME UHF (not sure of the model, one of the remote head models) it has been working fine for about 2 years, but now it still receives fine, but I can only transmit about 200 - 300 metres. the aerial is in the middle of the roof. I'm not sure what's going on. Any suggestions?
Thanks Tony.
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Reply By: Member - Broodie H3 - Wednesday, Mar 27, 2013 at 23:39

Wednesday, Mar 27, 2013 at 23:39
I have the same problem with the one in my vehicle I have just checked the aerial was connected to the radio correctly and found where it connects into the back of the radio it was loose' and I have just tried to transmit for reception and radio check and nothing happened so I am suspecting the mike may be faulty. I shall get the experts on to it in the morning. I know its not much help but that is the situation at the moment.
Broodie H3
Have car will travel

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AnswerID: 507704

Reply By: Ken - Thursday, Mar 28, 2013 at 07:36

Thursday, Mar 28, 2013 at 07:36
Hi Tony, have just had the same problem with a GME 3420. It was found to be a blown output stage according to the repairer. Apparently not all that uncommon with some GME models according to the repair place. Fairly easily fixed in Melb. for $125.00.
No obvious reason for it packing up, the cable was not damaged, connectors all tight and not problem with the antenna itself. I understand these radios also have some form of internal protection for their output stage ??? so possibly the problem was due to a failed component, who knows.
Good luck fix.

Ken
AnswerID: 507712

Reply By: Member - PJR (NSW) - Thursday, Mar 28, 2013 at 09:02

Thursday, Mar 28, 2013 at 09:02
Just a bit off track here but I would not jump too quickly to blaming the radio for blowing the output circuitry.

I have seen in the past some strange installations and repairs. Some look as if the soldering was done with a welder or even a plumbers 120 watt big brother soldering iron. You go to the tyre specialist to ensure the tyres are correct then why not go to a radio bloke to make sure the radio and whole antenna system is correct? Such an important bit of emergency comms not just a chat!!

I have mentioned it before to take your radios to those who have skills to work on them. Don't get a "mate from the pub" to install the radio or "see what's wrong" with it unless he or she has the skills. Matching the antenna and the whole length of the antenna cable, including the connector and erthing is very important. A kink in the cable, or a wayward braid strand or a shoddy soldering job can stuff the radio.

Phil
AnswerID: 507719

Reply By: PeterInSa - Thursday, Mar 28, 2013 at 14:25

Thursday, Mar 28, 2013 at 14:25
Had trouble transmitting with my remote head GME unit, probably the Mic cable purchased a new mic for around $44, works great.

Have another GME unit ( not a remote) with a similar problem hope its not the output amp but the mic cable, yet to test.

Peter
AnswerID: 507735

Reply By: CraigB - Thursday, Mar 28, 2013 at 15:01

Thursday, Mar 28, 2013 at 15:01
Before spending any money I would be checking all the joints/connections in the antenna cable first. As you said it has been fine for a couple of years which probably means in that time its been subjected to corrugated roads and overhanging trees on tracks. Only needs a hair-line crack in a solder joint or a slightly loose connection at either end to give the symptoms you have described.
AnswerID: 507737

Follow Up By: Ross M - Thursday, Mar 28, 2013 at 15:13

Thursday, Mar 28, 2013 at 15:13
Good advice Craig.

Having continuity where IT should be, and insulation where IT should be, is essential.


Essential to have continuity from the connector to the tip of the aerial and insulation of the shield from that centre conductor.
Many don't check these two items.
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FollowupID: 785030

Reply By: Ken - Thursday, Mar 28, 2013 at 15:56

Thursday, Mar 28, 2013 at 15:56
Just a clarification on my earlier post. I make no judgement on the quality or reliability of these radios. I have had a couple prior to this one and would not hesitate to buy another. The comment re output stage damage was not something I deduced or imagined, the info was given to me by the repairer, a GME dealer. As for mates doing the install and poor workmanship rest assured the work was done by a very able person with experience in electronics. Naturally before firing up the repair unit testing on cabling and the antenna itself was done and showed no problem. The fault may well have been due to a component failure, a problem that can occur with any electronic equipment

Ken
AnswerID: 507740

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