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