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Re: No audio but transmits ok
Check the Continuous Tone Coded Squelch (CTCSS) settings on all the radios. (Note that some manufacturers refer to this feature as a Privacy Code or Quiet Code. The actual name of the feature may vary.)
In order for your radios to communicate with eachother all of the radios need to be on the same channel and have the same CTCSS / Privacy Code programmed (or the CTCSS feature must be disabled on all the radios). If CTCSS is enabled on one of the radios, but not the other, the situation you describe would occur.
Check your user's manual for more information on the Privacy Tones and how to set them.
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Simrad RS82. Ok, can you switch to 1 watt and see if it transmits on low power? If it does, check all wiring and your power source (battery or power supply) for enough voltage. Marine radios often get corrosion on connections. Later, check your external antenna and connectors. Of course, you can never transmit on the pre programmed weather channels.
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.
Three things come to mind:
1) The radio is receiving, hence the light, but you may have a different PL code than the other radio and it is muting the transmission. Check your programming to be certain both radios are programmed alike. The red light indicates activity on your frequency.
2) Your radio may have a problem with the receive side of the radio or a bad speaker.
3) The transmitting radio may have a problem with transmit. This can be a sign of a bad battery. Swap batteries and see if the problem moves to the other radio. If so, replace the battery. (It takes more energy to transmit than to receive, so loss of transmit is common with a bad battery.)
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
You may have the CTCSS privacy code function enabled on one radio and not on the other. This function keeps your radio's received muted unless it receives a signal from another radio using the same privacy code. If you have Privacy Codes set for radio A but not for radio B you will still be able to transmit from A to B but when you transmit on radio B your signal will not be heard on radio A.
Make sure that both radios are set to the same privacy code or that the function is turned off on both radios.
Do you hear the Beeps on the speaker?
Check for the QT and the code squelch are the same in both radios, try to set code squelch in "0".
Make sure that the radio is not receiving or the other one is not transmiting, with two radios will see the same.
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.