
m4a5a_v320_eng (14.02.2013)
- 36 -
Kompetent für Elektroniksysteme
m4a5a_v320_eng (14.02.2013)
- 37 -
Kompetent für Elektroniksysteme
Connecting Major 4a/5a --> Two-Way-Radio via Multiwire
All audio in/outputs of the Major 4a/5a are equipped with transformers and hence are potential-free.
If no potential-free in/outputs are available at the radio, in both cases one of the audio connections
has to be grounded, preferably by connecting pins 1 and 8 to GND pin 4. Switching from 2- to 4-wire
is carried out by programming register 051/4.
PIN 5 is for supply (+12V) of external devices (LIM-AC, FT634aC).
Attention:
Do not use PIN 5 to supply a radio set. 200 mA output current is not sufficient.
Connecting Major 4a/5a --> LIM-AC
The LIM-AC can be connected to Major 4a/5a with a 8-terminal line. Commercially available computer
cables may be used. For this, Major 4a/5a must be set to 4wire mode (factory default in reg. 051/4)