MT-4E ANALOG & P25 DIGITAL RADIO SYSTEMS | MAINTENANCE GUIDE
Chapter 5: Codan Radio System Testing Page 21
Audio Connections
The Receiver, Transmitter and Auxiliary Balanced audio lines are available for connection on Codan
extender cards or by connecting to the optional back panel A-PNL-AUX96-3 screw-type terminal
connector. The extender cards have solder points available on each signal line that can have a small
test point (5059-TP110300) that is supplied with the extender card, soldered to them for easy connection
with clip-on type clips. Recommended Test Points are:
Audio Control Card and Base Control Card Extender Card pins (EC-96D1 and EC-96K-1.22):
Auxiliary 1 Audio Output = B11 and A11
Auxiliary 2 Audio Output = C1 and C3 (Audio Control Card); C2 and C4 (Base Control Card)
Auxiliary 1 Audio Input = C19 and C20
Auxiliary 2 Audio Input = B14 and A14
Receiver and Transmitter Extender Card pins (EC-48RD and EC-48RK-1.22):
Rx Balanced Audio Output = B26 and Z26
Tx Balanced Audio Input = B18 and Z18
Tx Subtone Input = B22 and Ground (B32)
The test points can be soldered into the extender cards as shown in Figure 5-1.
Figure 5-1: EC-96D1 and EC-48RD Direct Connect Extender Cards with Test Points Added
test points soldered
onto extender card
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