I can't answer as to why but I understand the frustration.
I'm sure this topic is on the RadioReference forums, but so far have not had a lot of time to look into it. I've seen a few post but none answered the questions I've had. I haven't seen the answer to the fix.
I wonder if it's related to the delay and hearing the radio traffic twice whenever I have my G5 on the amplified charger? That is problematic enough. But whenever I have one of my SDS scanners going it just compounds the problems so much more because you're hearing the same radio traffic, providing you're on the same talk group or in your scan at the time, coming at you at three different times with the delays. Due to the delay between the scanner audio, which I attribute to it needing to somehow use the SD card before the audio is passed, makes it hard to just use the SDS scanner and another regular scanner if they come across the same transmission at the same time. And then the G5 lower volume audio that comes through the Unication amplified charger speaker about 1 - 2 seconds prior to the louder audio passing through makes it sound like you have 3 out of sync radios receiving the same signal. If you're trying to listen for an address or any detail it can really make it hard and often impossible to catch the details in the transmission. This is something I'm going to look into and try to fix on my G5 setup.
When I try to use my G5 and an amplified Bluetooth speaker, I don't get a thump as much as I get a set of beeps or noises at the end of the transmission. I believe it's at the end because I haven't tried doing it in a while. There's no way you can put up with using a Bluetooth speaker and listening to this. It's very similar to what you hear when you go back and listen to one of the recorded transmissions on the G5. It's those same set of noises at the end of the transmission. It's definitely not a noise you want to hear. I've never tried it with Bluetooth headphones because I don't want to spend the money on them and then have this same thing happen in my ear. Does it work better if it's just a Bluetooth headset type of setup?
My only solution has been to try and make sure that I don't have the same talk group or frequency scanning on the scanner and the pager at the same time. But since this is a totally different topic I'm getting on, I'm going to stop talking about it.
I really do hope I can get these issues solved. And the one that you're talking about, even though mine sounds a little bit different than you described, is definitely something I hope to be able to fix. But I do wonder also if the two issues I mentioned, one being the same issue you're having, are related?
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Sent using Google Voice to Text. Please excuse any errors I could not see or catch.
Brian (COMMSCAN)