whoosh sound at ends of DMR transmissions

wa2n
Posts: 20
Joined: Thu Apr 08, 2021 5:34 am

Re: whoosh sound at ends of DMR transmissions

Post by wa2n » Sun Apr 25, 2021 2:37 am

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.
G4EML wrote:
Sat Apr 24, 2021 9:21 am
The 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.

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