MMDVM BER error rate tuning

Howto tune your MMDVM Hotspot to your radio

I have done this video (look below) where BER is tuned to lowest possible on MMDVM hotspot easily. it take only few minutes to do it.

Basically you need
– Console connection or ssh (and abit linux experience)
– Radio DMR for tuning
– MMDVM hotspot pi-star or self complied

For start you need compile new MMDVMCal version as this time of writing the pi-star one is outdated.
Start by installing necessary packets:
rpi-rw
sudo apt-get install git build-essential
git clone https://github.com/g4klx/MMDVMCal.git
cd MMDVMCal
make -j4
sudo systemctl stop mmdvmhost
./MMDVMCal /dev/ttyAMA0

Now you have the tool open, you start by inserting right frequency, then put full power, then dmr ber mode pressing B. you will press ptt on your radio at tg1 on same frequency then tune up frequency while looking the error bit rate. do it untill get 0.0% error rate. (THIS IS DONE ON THE FLY, ADJUST FREQUENCY UNTIL THE ERROR IS 0%)
You want also tune deviation, if your radio wont listen the hotspot well. there is option M/m for DMR simplex 1031Hz deviation test.

After you done adjustments you want new frequency and calculate right offset for it, same as deviation you calculate right number for it(look mmdvm manual how to do this)

After completing edit your mmdvm.ini you want to restart/start the mmdvm
service sudo systemctl start mmdvmhost

Video, restart video from begining to see all.
video has also some other info about transmit power and how wide the harmonics are on VHF/UHF modes