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Author Topic: GM950 TX Problem (Flashing LED's and Intermittant Bleeps) RX OK <HELP>  (Read 3874 times)
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« on: May 23, 2015, 12:02:33 PM »


I have a GM950 (VHF) model M08KHF4AN3AN that has developed a fault.  RX is fine, but when I press the PTT I get no RF out and the LED's on the left of the display flash and the radio emits a intermittent bleep as can be see in the video here:


I have tried reprogramming the radio on various frequencies throughout it's VHF range, but it still has this issue.  Currently its programmed on the amateur 2m band and RX is very good, but I have no RF power going out when I press the PTT.

Any help or advice most welcome.

73 Colin G1IVG
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« Reply #1 on: February 04, 2019, 09:16:22 PM »

Hello Colin,

I know that this is an old entry, but since it is the same fault and I have not found information about it, I consult you if you have managed to solve the problem.

I bring my experience:
As you read on page 3 of https://www.zenbakaitz.com/GM950_UG_EN.pdf, I understand that the failure is due to the hardware:
Audio Signals

H / W error - Button press
not accepted, tone
continue until valid

I have:
* Disconnected the RF exciter and amplifier stages
* Disconnected the temperature sensor of the RF amplifier stage, the NTC R3611 (THERM 100K @ 25C)
* Changed the voltage regulator U0601 (IC 9.3V REG 2941)
* Changed the head of the radio
* Made many changes in its programming (frequencies, powers, etc.)

I would try to update the firmware, but I have not found enough information to do it. Here it says that it is possible to do it:

I only conclude that the fault is located on the main board of the radio, but I do not know if it is hardware or software still.
It could also be a damaged internal track, since it is a multilayer plate.

A cordial greeting.
Josť Luis
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