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Not getting audio

Hello Sir, i have gm338 vhf transmitting and receiving all ok but i am not getting audio, i check sound amplifier ic that is ok speaker also ok. volume control also ok. how can i solve this problem

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Check your receive audio enable.

Posted on Jan 23, 2009


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? new bp 200 replacment for bp 199 will not operate my ic t8e radio


The IC-T8E is the Icom VHF / UHF Amateur (or "Ham") transceiver capable of wide-band AM & FM receive and 6 meter (50Mhz - 54Mhz) , 2 (144Mhz - 148Mhz) meter and 70 centimeter (430Mhz - 450Mhz) FM only transmit - when appropriately licensed by your country's communications authority.



RigPix Database Icom IC T8E



Any FM transmitter operating in those frequency ranges will be received and played thru the speaker - unless they are encoded with a squelch decode sub-audible tone or digitally encoded squelch control that does not match the one set to the IC-T8E. Program the squelch to be open or to match that of the transmitter so that the radio will play only when that particular transmitter is transmitting.



An FM transmitter operating in APCO25, DSTAR, etc. will not be decoded as these are digital signals that the ICT82 is not capable of decoding.



I was unable to locate any "BP200" radio you mentioned, so I can't comment on their capabilities or if they have an incompatibility in encoding, frequency, etc.

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I have feedback when transmitting


Check your audio settings. Feedback is a condition caused when you are transmitting and your audio is coming out of a speaker (headphone) and is picked up by the microphone. Try turning your audio down; reducing your microphone gain; and perhaps using a wind sock (microphone cover) over your microphone to reduce the amount of feedback audio entering into the microphone (manual pg 13).

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check RX/TX frequency must be same, also check QT/DQT, this option at both radio must be same or disable.

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1 Answer

No sound on unit


There are any number of reasons for no sound. I will assume you're using new batteries or fully charged batteries. The simplest reason is that a wire has become disconnected from the speaker. This would make the radio sound the same on as off. To test this see if the radio has a way of turning the squelch off, sometimes a simple push button, sometimes a menu setting, sometimes a dial to adjust the squelch setting. If there is no hissing, sometime very loud so turn your volume down first, then either the audio output amp is dead or a wire to the speaker is broken or disconnected. I today's radios the audio amp is most likely a simple small IC but, it could be inside an all-in-one chip and if it's proprietary getting the chip could be a problem. If it's a simple audio chip you'll have to find a replacement or rig up another audio amp IC to work as a replacement. Let's hope for the simple broken or disconnected wire which should be easy enough to fix.

Now, if when you remove the squelch you hear the hissing but you still cannot hear transmitting from your other radio, it could be that the one transmitting is in fact NOT transmitting an not that the other radio cannot hear. You have checked that both radios can or can not hear someone else's radio right?

Assuming you do know that one radio cannot hear what the other can and make no sound other than hissing when the squelch is off the problem is either in the RF or IF sections of the radio's receiver. In general this used to be a more complex repair so let's go another easy fix by going to the very first place the RF comes in, the antenna.

Just like the audio section when a speaker wire is disconnected sometimes the wire or trace going to the bottom of the antenna can become disconnected or broken. To check this bring a good transmitting radio very close to the one that hisses but does not hear the transmitting radio and see if any place as close as you can get the two radios causes the non-hearing radio to hear the transmitting radio. If so, then look for a problem with the antenna connection.

If none of these easy things bring the problem to heel then there's probably something amiss in the RF or IF receiver sections. If the radio has one or two chips that do all the work here then see if you can get both and replace them. I haven't even taken apart my own small FRS radios to see how complex the receivers are in these so I won't go any further than that since I simply don't know your radio.

I hope that helps.

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turn the squelch down? the RF gain down too
do you have an attenuator turned on ?

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1 Answer

What is the difference between GM338 and PRO7100


GM338 is an Asia/Pacific model. Available Lowband, VHF, UHF, in 1-25 or 25-45 watts.

PRO7100 is a Latin American model. Can program in English, Spanish, French and Portuguese. Available in 200 MHz, VHF, UHF, 700 MHz.

These are very similar to the CDM1250 mobile for use in the United States. The PRO7100 and GM338 are not type accepted for use in the United States.

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1 Answer

Radio not receiving on any channel


Hi Mike,

The manual for this radio (in Adobe .pdf format) is available for download directly from Icom America, free of charges.

Since the "AquaQuake" function works and you do hear static when the squelch is off, that is sufficient to let us know that the voice coil of the speaker is functional and should produce sounds with the right signal applied.

The first thing to determine is if you're close enough to another operating transmitter for the radio to receive a signal. One of the 10 weather channels the radio is capable of tuning should be close enough produce some intelligible audio from the speaker - assuming the squelch setting isn't set too high.

If a WX channel works, then you'll need to see if there's a VHF Marine band transmitter operating nearby. You might need to set another Marine band radio receiver up to verify that there is indeed a signal present on the particular Marine band channel that you're monitoring. A list of frequencies is published on pg 27 (of the manual linked above) in case you need to convert between channel and frequency to tune on a non-channelized radio.

Outside of that, there's little the end user can do without specialized test equipment, schematics and of course, training. Many shops will be happy to provide an estimate for repair when provided with a small bench diagnostic fee. This fee is usually applied towards an authorized repair by most reputable repair shops.

I hope this helps & good luck!

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I think you can have problems with the speaker, if you see the signal display working when you reiceve the VCO is working. If you could check (I dont remeber if this radio has audio connectors) external speaker. If this radio has an audio conector, this conector switches the internal and external speaker and could be dirt and is not switching to the internal spk.

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