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GP338 plus MODEL AZH38KDH9AA6 SERIAL NO 004GN4071 is giving error tone with synth unlock display

GP338 plus giving error tone when put on, with synth unlock display

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Unfortunately synthesizer unlock indicates the radio is in need of repair.

Posted on Sep 17, 2008

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HI, I have a GM338 VHF radio with "synth unlock" how can I fix it, please help me

If "synth unlock" is displayed when you power the radio on, that means the frequency synthesizer is unable to synthesize the desired frequency. it may be faulty or the last frequency entered in the radio may be out of the radio's range. Try changing channels. If that doesn't resolve the problem then the synthesizer is most likely bad and the radio would need to be serviced by a qualified radio service shop.

May 26, 2014 | Motorola Radio Communications

1 Answer

GP338 with wifi router

Simple answer, no. There are devices which would aid in connecting your radio communication with the internet, too large of a topic for this basic answer. Look at and read about their IP Gateways.

Feb 16, 2014 | Motorola Radio Communications

1 Answer


You can tell by looking at the radio. Either on the bottom or on the back of the chassis (where you would find the serial number) you will see a small green diamond with an FM logo inside. This would indicate the radio is intrinsically safe (factory mutual approved). If the radio is intrinsically safe you must also use an intrinsically safe battery. Check the battery for the green markings too.

Best regards.

Apr 15, 2011 | Motorola GP300 Compatible 2 Way Radio...

1 Answer

Can motorola talkabout T5720 FRS/GMRS talk with Motorola GP338 UHF?

Your GP338 would need to be reprogrammed to one or more of the frequencies available in the T5720. If you are using the interference code eliminator, it would also need to be programmed into the GP338. Take your GP338 to your local Motorola dealer for reprogramming.

Here is a link to the user guide for the T5720, where you will find a list of frequencies: See page 19.

Best regards.

Feb 23, 2011 | Motorola Talkabout T5720 (7 Channels)...

1 Answer

Fram my radio gp338, the audio becomes slowly goes

if when you are transmiting your voice level is falling down in the others radios, this is a modulation problem, try with an audio accesory if you voice level or modulation level keeps constant your radio need to be repaired. if your problem is when you are receiving a communication, may be the speaker needs to be replaced

Jan 02, 2010 | Radio Communications

1 Answer

Operation of handie talkie GP338

Mostly of this features need to be able by the programing software, this mean that if you dont find it with your menu botton, mean that the radio has disable this features, also depends on the system that provide the service to have this features working, on your profile as customer, ETC Check this link can help you

Aug 25, 2007 | Motorola Walkie Talkie 2-Way Radio

1 Answer


This tone indicates that there is a problem with the radio, I tried to find in the service manaual the meaning and just says " due to nature of fatal ROM and RAM errors it may not be possible to present an error code on the display, in there cases the radio will attempt to display the aproriate error code, generate an ellegal mode tone for one second and reset its Up." I hope this can help you

Mar 06, 2007 | Motorola HT1000, MTS2000, MTX8000/9000...

1 Answer

Mt1000 lock up

I think there is a problem with the Synthetizer, you will need quilyfied service. This could be caused when you change frequency, the Synth, can not be able to "produce" the desired freq. caused for a problem in this area, this causes to the radios get PLL UNLOCKED and this could be the way that the radio give an alert to the user.

Feb 28, 2007 | Motorola MT1000 Compatible 2 Way Radio...

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