MT-4E VHF & UHF Receiver & Transmitter Instruction Manual
IM08-MT-4E-TXRX-P1162
700 / 800 / 900 MHz Jumpers
30
tRanSMIttER JuMPERS
700 / 800 / 900 MHz 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.
JU23
IN
Jumper for D&D Testing (Disconnect SSI Data Line)
JU24
IN
Jumper for D&D Testing (Disconnect SSI Data Line)
JU25
IN
Jumper for D&D Testing (Disconnect SSI Data Line)
JU26
OUT
Jumper for D&D Testing (Disconnect SPI Data Line)
JU27
IN
Jumper for D&D Testing (Disconnect SPI Data Line)
JU28
IN
Jumper for D&D Testing (Disconnect SPI Data Line)
JU29
IN
Jumper for D&D Testing (Disconnect SPI Data Line)
JU30
Y
X: ENCRYPT-MT4E-XX Selects which UCM installed
Y: ENCRYPT-MT4E-XX1
700 / 800
MHz Receiver Mainboard Jumpers (continued)
