G4EML wrote: ↑Sat Apr 24, 2021 9:21 amThe HR-C6000 DMR chip and the firmware normally check the CC to ensure that the received signal is valid. This check is built into the hardware. I managed to find a way of disabling it to allow the CC filtering to be turned off. This is using the chip in a way that was not intended by its manufacturers. Unfortunately this can result in the bursts of noise you are hearing when the signal starts and stops.
In commercial use a DMR radio would never need this feature. However it is a useful tool for amateur radio use.
As Daniel says, this feature is not intended to be used for normal reception. It should only be used for a short time to detect the correct CC for a new signal and then that CC can be entered in the channel details menu.
Colin.
whoosh sound at ends of DMR transmissions
Re: whoosh sound at ends of DMR transmissions
Thanks for the detailed explanation Colin, makes perfect sense. After Daniel's suggestion to turn on the CC filter the bulk of the noise disappeared.