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Technical Details
If you are interested in the audio connector interface, see our "Single Pin Mono Headset Pin-Out" article.
In order for this security headset to work with the Cobra microTalk CXT280 radio, the radio has to be in VOX mode while the headset is in PTT mode. After pushing and holding the PTT button, you can start transmitting voice. But the transmission will only occur after the CXT280 radio has detected voice (VOX mode). Therefore, your initial voice will be cut off (as with any radio in voice activation mode).
It seems to us that the Cobra radio cannot detect the PTT button being pressed on the headset. Instead, the PTT button simply enables the voice to travel to the radio. It is a limited success with the Cobra microTalk Two-Way Radio CXT280. It seems that the limitation is on the radio side.
The audio is loud and clear through the transparent earbud and transparent audio tube. Voice activation works well, too, but be prepared to talk at a slightly louder voice than your typical chatting voice.
The security headset works right off the bat with the Motorola TalkAbout MR350R radio. Both VOX and PTT works. However, there are some artificial limitation imposed by the Motorola MR350R radio. In order for the security headset to work in VOX mode, the security headset has to be plugged in, then the MR350R radio turned on. The MR350R will detect the security headset and automatically switch to VOX mode. However, as soon as you press the PTT button on the MR350R radio, it switches VOX off.
That also means you can't switch between PTT and VOX mode on the fly with the switch on the security headset. As soon as you switch to PTT mode using the headset, you have to stay in the PTT mode. Switching back to VOX mode on the headset causes the MR350R radio to think PTT button is continuously pressed. The only way to switch back to VOX mode is to turn off the MR350R radio, switch the headset to VOX, and then turn the MR350R radio back on.
The audio is loud and clear through the transparent earbud and transparent audio tube. Voice activation works well, too, but be prepared to talk at a slightly louder voice than your typical chatting voice.
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