TN840 Extender Cards and Kits
MT-3/4 Radio Systems
TECHNICAL NOTES
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TN840, REV 4-1-0, © Mar 2013
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The following extender cards and kits are available:
EC-48RD Extender Card
Used for all transmitter, receiver and system regulator modules.
Direct connect (no cables).
Extender card and adapter panel extrusion are mounted in the subrack in TX, RX or SM-3 slot.
Adapter panel supports the module outside the subrack and has diff erent slots for each module.
EC-96D1 Extender Card
Used for the 96 pin control cards (AC-3E, CI-RC-4L, CI-BC-4E, UIC-4).
Direct connect (no cables).
Extender card is mounted in the subrack in the control card slot.
Control card is inserted into the red plastic rails on the end of the extender card and is locked into place using
black locking levers.
EC-48RK-1.22 Extender Kit
Used for all transmitter, receiver and system regulator modules.
Extender card and four foot cable.
Extender card and adapter panel extrusion is mounted in the subrack in TX, RX or SM-3 slot and cable is used to
attach to module.
EC-96K-1.22 Extender Kit
Used for the 96 pin control cards (AC-3E, CI-RC-4L, CI-BC-4E, UIC-4).
Extender card and four foot cable.
Extender card is mounted in the subrack in the control card slot and cable is used to attach to module.
Test Points
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 & A11
Auxiliary 2 Audio Output = C1 & C3 (Audio Control Card); C2 & C4 (Base Control Card)
Auxiliary 1 Audio Input = C19 & C20
Auxiliary 2 Audio Input = B14 & A14
Receiver and Transmitter Extender Card pins (EC-48RD and EC-48RK-1.22):
Rx Balanced Audio Output = B26 & Z26
Tx Balanced Audio Input = B18 & Z18
Tx Subtone Input = B22 & Ground (B32)
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