MT-4E VHF & UHF Receiver & Transmitter Instruction Manual
IM08-MT-4E-TXRX-P1162
VHF & UHF Hardware Tuning and Troubleshooting
13
RECEIvER JuMPERS
vHF / uHF Receiver Mainboard
PCB 50164
Jumper
Default Position Function / Description
JU1
IN
When installed enables Clear Keys 1 Input
JU2
IN
When installed enables Clear Keys 2 Input
JU3
IN
When installed enables power to Discriminator Output amplifier
JU4
OUT
RX Mode Pullup
JU5
OUT
When installed bypasses AC coupling on the Discriminator output
JU6
IN
RX Secure / Clear Pullup
JU7
OUT
When installed enables power to Disc LPF
JU8
OUT
COR Pullup
JU9
X
Balanced Audio Transformer (X: Active, Y: Bypass)
JU10
X
Balanced Audio Transformer (X: Active, Y: Bypass)
JU11
IN
When installed enables power to Balanced Audio Output Amplifier
JU12
OUT
Increase Balanced Audio Gain by 2.7 dB
JU13
OUT
Disable 600 Ω Audio Output; Enable Low Impedance Audio Output
JU14
X
Balanced Audio Transformer (X: Active, Y: Bypass)
JU15
OUT
For factory testing purposes only (power to coax for RF Preselector)
JU16
IN
Isolate IF Filter Stage
JU17
IN
For factory testing purposes only (RX Main to DSP on UDB)
JU18
IN
For factory testing purposes only (RX Main to DSP on UDB)
JU19
IN
For factory testing purposes only (RX Main to DSP on UDB)
JU20
OUT
For factory testing purposes only (RX Main to DSP on UDB)
JU21
IN
For factory testing purposes only (RX Main to DSP on UDB)
JU22
IN
For factory testing purposes only (RX Main to DSP on UDB)
JU23
IN
For factory testing purposes only (RX Main to DSP on UDB)
JU24
IN
For factory testing purposes only (supplies power to IF VREF)
JU25
JU26
JU27
X
X
X
Communications for ENCRYPT -MT4E-XX1
X: synchronous
Y: asynchronous
JU28
---
Does not exist
JU29
IN
UDB MCLR
JU30
IN
DSP GPIO5
JU31
IN
DSP GPIO6
JU32
Y
X: ENCRYPT-MT4E-XX
Y: ENCRYPT-MT4E-XX1
Selects which UCM installed
