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MT-4E VHF & UHF Receiver & Transmitter Instruction Manual
IM08-MT-4E-TXRX Project 1106
Hardware Tuning and Troubleshooting
15
48 PIN MOTHERBOARD INTERFACE CONNECTOR
A 48 pin connector is used for interfacing the MT-3 Motherboard to the receiver and transmitter.
Receiver
Pin Name Pin Name Pin Name
D2 Relay Normally Open 1 [O/P] B2 +13.8 VDC [I/P] Z2 +13.8 VDC [I/P]
D4 Relay Common 1 [O/P] B4 Receive Secure / Clear* [O/P] Z4 No Connect
D6 Relay Normally Closed 1 [O/P] B6 +9.5 VDC [I/P] Z6 +9.5 VDC [I/P]
D8 Relay Normally Closed 2 [O/P] B8 No Connect Z8 No Connect
D10 Relay Common 2 [O/P] B10 Discriminator LPF [O/P] Z10 No Connect
D12 Relay Normally Open 2 [O/P] B12 COR* [O/P] Z12 COR* [O/P]
D14 Clear Keys 1* [I/P] B14 Discriminator [O/P] Z14 Squelch Override [I/P]
D16 Clear Keys 2* [I/P] B16 No Connect Z16 No Connect
D18 No Connect B18 No Connect Z18 Bank A/B* [I/P]
D20 Channel Select 0 (LSB) [I/P] B20 SM-3 Speaker Audio [O/P] Z20 No Connect
D22 Channel Select 1 [I/P] B22 No Connect Z22 No Connect
D24 Channel Select 2 [I/P] B24 Signal Strength (RSSI) [O/P] Z24 A/D Receive Mode [O/P]
D26 Channel Select 3 (MSB) [I/P] B26 Balanced Audio 1 [O/P] Z26 Balanced Audio 2 [O/P]
D28 No Connect B28 Mute* [I/P] Z28 No Connect
D30 No Connect B30 Ground Z30 Ground
D32 No Connect B32 Ground Z32 Ground
Transmitter
Pin Name Pin Name Pin Name
D2 No Connect B2 +13.8 VDC [I/P] Z2 +13.8 VDC [I/P]
D4 No Connect B4 Microphone Audio Output [O/P] Z4 Microphone Audio Input [I/P]
D6 No Connect B6 +9.5 VDC [I/P] Z6 +9.5 VDC [I/P]
D8 No Connect B8 Isolated Positive PTT [I/P] Z8 Isolated Negative PTT [I/P]
D10 No Connect B10 PTT* [I/P] Z10 PTT* [I/P]
D12 No Connect B12 Bank A/B* [I/P] Z12 Bank A/B* [I/P]
D14 Clear Keys 1* [I/P] B14 PTT* [I/P] Z14 PTT* [I/P]
D16 Clear Keys 2* [I/P] B16 No Connect Z16 No Connect
D18 No Connect B18 Balanced Audio 2 [I/P] Z18 Balanced Audio 1 [I/P]
D20 Channel Select 0 (LSB) [I/P] B20 SM-3 Speaker Audio [I/P] Z20 No Connect
D22 Channel Select 1 [I/P] B22 Subtone [I/P] Z22 No Connect
D24 Channel Select 2 [I/P] B24 PTT Output* [O/P] Z24 Transmit Secure / Clear* [I/P]
D26 Channel Select 3 (MSB) [I/P] B26 Forward Power Alarm* [O/P] Z26 High VSWR Alarm* [O/P]
D28 No Connect B28 No Connect Z28 A/D Mode Control [I/P]
D30 No Connect B30 Ground Z30 Ground
D32 No Connect B32 Ground Z32 Ground
* Indicates an active low signal.