Specifications; Wiring Connections - ZUM Radio MMDVM-Pi User Manual

Elite 3.5 LCD ZUMspot kit user guide

Specifications

The MMDVM-Pi board is designed for repeater and high power hotspot applications – connects to user
supplied Raspberry Pi board and radio(s)

Utilizes a high performance 32bit ARM processor (STM32F722) running at 180Mhz (Room for
future upgrades)

Fifth generation analog filter design that provides an extremely low BER compared to previous
generations

2 Multi-turn pots for fine RX and TX adjustments

Onboard LEDs to show status and modes (PTT, COS, Power, D-Star, DMR, P25, Fusion, NXDN and
POCSAG)

Onboard LED to show receive signal level clipping

Connection for OLED and Nextion LCD screens

8 pin JST Connector with pigtail wires

Open source MMDVM firmware preloaded and easily upgraded by software

Wiring connections

Here is a picture of the 8 pin header with cable showing wire colors:
Here is a table of the pin numbers, names and wire colors:
Pin number Signal name
1
2
3
4
5
6
7
8
Copyright 2019-2022 ZUM Radio, Inc
CTRL
COS/STAT1
RX audio Receive audio from radio (input)
Ground
Ground
TX audio Transmit audio to radio (output)
PTT Push to talk (enable transmit) (input)
RSSI Received signal strength indicator (input)
Description
Control (output)
Carrier sense (input)
Signal ground
Signal ground
3
Wire color
Black
Red
White
Yellow
Orange
Green
Blue
Purple
Rev 1.0