MT-4E VHF & UHF Receiver & Transmitter Instruction Manual
IM08-MT-4E-TXRX-P1162
29
700 / 800 / 900 MHz JuMPERS
RECEIvER JuMPERS
700 / 800 MHz Receiver Mainboard
PCB 50171
Jumper
Default Position
Function / Description
JU1
OUT
Enable Clear Keys 1
JU2
OUT
Enable Clear Keys 2
JU3
IN
Enable Power to Discriminator Circuit
JU4
OUT
Enable Pullup Resistor on RX_Mode
JU5
OUT
Bypass 330 nF Audio Cap
JU6
IN
Enable Pullup Resistor on RX_Sec / Clr
JU7
OUT
Enable Power to Discriminator LPF Circuit
JU8
OUT
Enable Pullup Resistor on COR
JU9
X
Balanced Audio Transformer (X=Active, Y=Bypass)
JU10
X
Balanced Audio Transformer (X=Active, Y=Bypass)
JU11
IN
Enable Power to Balanced Audio 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
X
X: Synchronous
Y: Asynchronous
JU16
X
X: Synchronous
Y: Asynchronous
JU17
X
X: Synchronous
Y: Asynchronous
JU18
IN
Synthesizer Programming
JU19
IN
Synthesizer Programming
JU20
IN
Synthesizer Programming
JU21
IN
Enable 3.3 V Power to IF VREF
JU22
IN
For factory testing purposes only (Isolate XTAL filter stage from circuit)
