Hytera MD78X Service Manual

Interface Definition
UHF5 (806MHz
–
941MHz)
38
Pin
No.
Name Type
Signal Electrical
Performance
Description
3
GP5_3
(Chan_Act)
GPIO 5V TTL GPIO. Programmable via CPS.
4 SWB+
Power
output
Power supply :13.2V±15%;
output current ≤1 A
Power
output: 13.2 V; output
current: ≤1 A
5 External Alarm
Analog
voltage
output
13 V alarm output
Programmable output pin
(“External Horn & Lights” feature
by default, programmable via
CPS).
6 Power Ground
Power
supply
(grounding)
/ /
7 TX Audio
Analog
signal input
Vrms=80 mV±10%@1 kHz
60% system max. deviation
This pin is used for signal input
of external MIC. The audio path
is valid when the external Mic
PTT is held down.
8 RX Audio
Analog
signal
output
Load impedance>1 kΩ
Vrms=300 mV±10%@1
kHz 60
% system max.
deviation
Default output is 300 mV. The
output signal amplitude can be
changed by modifying the
“Analog RX Gain” value via
CPS.
9 SPK-
Analog
output
It forms differential output
together with SPK+. Max
power output: 10 W(R=8 Ω)
External speaker output-
10 D+
USB data
cable+
USB data USB data cable+
11 USB_GROUND
Ground
cable
/ /
12
GP5_2
(Monitor)
GPIO 5V TTL
GPIO. Programmable via CPS;
Monitor feature by default.
13 ACC_IO2 Digital input 5V TTL
Accessory identification

Hytera MD78X Specifications

General

Brand	Hytera
Model	MD78X
Category	Radio
Language	English