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Since the radios are from a yard sale, the batteries are likely bad. Transmit takes a lot of power, likely more than the batts can produce. Assume the batts are good, 1) same channel, as you said: 8. BUT, the same code? You need the channel and code to match. If you transmit on one, is there a blinking indicator or small screen indicator that changes? If so, your radios do work. You need to program them exactly the same.
Check the headset jack. There may be something inside causing a short. also, the CLS has an audio tone out button. Be certain you are not pressing it as you push the PTT button. The PTT is odd on this radio, it is the top BIG rubber button on top FRONT. Many customers get this confused with the tone transmit button.
It is called battery save. You push the push to talk about 3-5 seconds and all the radios will "wake up". On most models, it can be turned off, but battery life (time before you need to recharge) is shortened.
The battery is bad or not charged. Check your charger and charger/battery connection. Clean all contacts with a pencil eraser and try charging again. With a new battery it may take up to 3 charge cycles to fully charge your battery.
You can open the radio up and clean the switch up a bit but it sounds like the switch may be worn. It's a simple on off push switch. You may just go to your local hardware store or electronics store and get a switch and solder it in.
In radio communications, "voice activation" or "VOX" has been used for
decades where convenience or the need for hands-free operation rule
out push to talk. The idea is simple: monitor the microphone input
and transmit only when the user is actually talking.
The sound produced by a Motorola radio when the mike is keyed refers to the "Transmitting
Call Tone" which is another feature other than the "Interference
Eliminator" or the "Roger
On most Motorola GMRS/FRS TalkAbout radios, setting the "Call
Tone" to 0 disables the feature. This is done with the radio ON by pressing on the "Menu" button 3 times which will result in the display showing the current Call Tone setting (flashing) and the letters CA; pressing on the <- or +> buttons will change selection (you
will also hear the different Tones), select 0 (it
may be up to 5 or 10 depending on the version). Press on the "Menu" or "PTT" button to set, save and exit.
Hope that this be of some help/idea. Pls post back how things turned out or should you need additional information.
If you are using vox (voice activated transmit) go into the menu and make sure you don't have the VOX setting too high.
You should be able to put the headset on... hit the "push to talk" button on the radio and transmit you audio. Turn the other radio on and make sure the radio is "keying" (tx with no auio) then make sure there is audio. If you don't have audio but the radio is transmitting.. you might have the wrong type of plug on your headset for the audio..... there are 2 plugs... 1 for transmit audio....1 for recieve audio. It could be the wrong type of plug for the jack in the radio.
Regardless.. the way the headset works is either you push the "push to talk button" onj the radio OR you use the VOX function... with the vox function you just have to talk into the mic to transmit. This is what your headset is designed for. You will have to go into the menu and set up the radio for VOX.
If you still have problems follow my directions at the top of this page ( check mic jack and stuff)
I think you just have to set the radio up for VOX operation and set the VOX setting.
You should be able to push the push to talk button and talk through the mic on the headset. If you don't get any audio that way there is a problem and you should check the jack and plug on the headset.