User's Manual

MT-4E VHF & UHF Receiver & Transmitter Instruction Manual
IM08-MT-4E-TXRX-P1162
VHF & UHF Hardware Tuning and Troubleshooting
14
TRANSMITTER JUMPERS
VHF / UHF Transmitter Mainboard
PCB 50156
Jumper Default Position Function / Description
JU1 X X: A/D Front Panel Switch selects transmitter A/D mode
Y: A/D External Input selects transmitter A/D mode
JU2 Y X: MIC OUT connects to Microphone Audio Input
Y: MIC IN connects to Microphone Audio input
JU3 X X: 600 Ω Audio Transformer
Y: Bypass Transformer
JU4 IN When installed selects 600 Ω resistance to ground
JU5 OUT When installed enables Clear Keys 1 Input*
JU6 OUT When installed enables Clear Keys 2 Input*
JU7 X X: 600 Ω Audio Transformer
Y: Bypass Transformer
JU8 X X: 600 Ω Audio Transformer
Y: Bypass Transformer
JU9 OUT When installed bypasses AC coupling on the Subtone / Direct Modulation input.
JU10 X X: ENCRYPT-MT4E-XX
Y: ENCRYPT-MT4E-XX1
Selects which UCM installed
JU11 OUT Changes gain for TCXO / MOD input to synthesizer
JU12 X X: Direct MOD input
Y: Spare
Select source for the Spare input.
JU13 X X: Spare
Y: DSP Bypass
Select source for the Spare input.
JU14 OUT When installed disables AC coupling of direct MOD input.
*Installed ony if encryption is enabled.
FRONT PANEL RJ45 JACK PINOUTS
A single, 8-position RJ45 jack is mounted on the front panel of the receiver and transmitter. The
following are the connections on the RJ45 jack.
Pin Signal
1 CRYPTO MODULE KEYLOAD
2 UNUSED SPARE
3 ANALOG COR / PTT
4 LVDS DATA A
5 LVDS DATA B
6 DIGITAL COR / PTT
7 NO CONNECTION
8 NO CONNECTION
Shield GROUND