Set your analyzer to see the transmit signal. Be sure to set up a sufficiently powerful attenuator to protect your analyzer. Your spectrum analyzer must now be connected to the RF output of the transmitter. You can optionally listen the signal with an analog receiver set on the output frequency of your (future) relay. At this time, the MMDVMCal software sends a low-frequency signal of 1200 Hz to your transmitter. The PTT light on the MMDVM board must light up. To switch to transmission, press the space bar. Place the “D” command (shift key D) to enter the DMR mode setting. The commands are:ĭ DMR Deviation Mode (Adjust for 2.75Khz Deviation) Usually, the USB port is created under /dev/ttyACM0 sudo /opt/MMDVMCal/MMDVMCal /dev/ttyACM0 Start the tuning software, specifying the serial port on which the arduino is connected to the Raspberry Pi. MMDVM, filter shield with PS2 connectors for transceivers The Squelch (COR) signal level must be checked (active = high level), and if necessary be reversed by programming the GM360. They are connected to the filter shield with PS2 (6-pin) connectors, and on the GM360 accessory socket (Supplier eg Aliexpress). In my case, I use two Motorola GM360 sets. Take a moment to check your wire-to-wire connections before you start the settings (Rx Audio, Squelch, Tx Audio, PTT and Ground). To make our adjustments, your transceivers must be connected to the MMDVM filter shield. We will launch the compilation of the software. We change now to the /opt/MMDVMCal directory that contains the source code previously downloaded. Sudo git clone Compile the MMDVMCal software We are now downloading Jonathan’s MMDVMCal project and made available on, with this command: cd /opt/ Installing the Calibration Software Download MMDVMCal For this, we will use the calibration software MMDVMCal. A spectrum analyzer and its attenuatorsįirst, we will set the transmission of the repeater, then in a second step, the reception of the repeater.Nous vous présentons la technique permettant d’avoir un résultat optimum.
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