User Manual

MT-4E VHF & UHF Receiver & Transmitter Instruction Manual
IM08-MT-4E-TXRX Project 1106
Hardware Tuning and Troubleshooting
13
RECEIVER JUMPERS
Receiver Main Board
Jumper Default Position Function / Description
JU1 OUT When installed enables Clear Keys 1 Input
JU2 OUT When installed enables Clear Keys 2 Input
JU3 IN When installed enables power to Discriminator Output amplier
JU5 OUT When installed bypasses capacitance coupling on the Discriminator output
JU7 OUT When installed enables power to Discriminator Output LPF amplier
JU9 X X: 600 Ω Audio Transformer
Y: Bypass Transformer
JU10 X X: 600 Ω Audio Transformer
Y: Bypass Transformer
JU11 IN When installed enables power to Balanced Audio Output amplier
JU12 OUT When installed increases the gain of Balanced Audio Output amplier
JU13 OUT When installed selects 600 Ω resistance to ground
JU14 X X: 600 Ω Audio Transformer
Y: Bypass Transformer
TRANSMITTER JUMPERS
Transmitter Main Board
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 IN When installed enables Clear Keys 1 Input
JU6 IN 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 capacitance coupling on the Subtone / Direct
Modulation Input
Jumpers are shown on the MT-4E Transmitter
Jumper and Test Point Locator Illustrations.