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High performance 32-bit ARM processor, fully tested.
Supports DMR, P-25, D-Star and system fusion.
Onboard LEDs to show status (Tx, Rx, PTT, Mode).
Up to 10mW RF power.
SMA antenna connector, antenna is included.
Mounts cleanly on all current Raspberry Pi, including the Pi Zero.
The firmware is pre-loaded and is easily upgraded via software.
Open source 3D printable box available.
UHF 430-450MHz, 433MHz and 900MHz, VHF 144 220 Opera FREQ.
The upper part is TX, the lower is RX antenna.
Modem select: STM32 HS GPIO
Set TX frequency, RX frequency
TX, RX frequency had better 10M or more apart.
SLOT1, SLOT2 support.
Package size: 80 * 80 * 30mm / 3.1 * 3.1 * 1.2in
Package weight: 40g / 1.4ounce
Best version: latest version V1.3, and the firmware is latest.
Duplex variant of MMDVM HS Hat: this PCB uses the MMDVM HS. It has two ADF7021 onboard and allows for duplex operation with two time slots on DMR.
Revision 1.3: an accidentally deleted 3v3 wire has been added back to the PCB layout. BOM, Mouser cart and stencil stay the same as for rev1.2.
1 * MMDVM Duplex Hotspot Module
2 * Antenna
2 * SMA Socket