User's Manual

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 amplier
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 Amplier
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