Codan-radio MT-4E Analog and P25 Digital - Maintenance Guide Instrukcja Użytkownika Pobierz pdf (Strona 40)

MAINTENANCE GUIDE | MT-4E ANALOG & P25 DIGITAL RADIO SYSTEMS

Chapter 5: Codan Radio System TestingPage 32

Receiver RF Preselector Alignment and Tuning

Tuning of the RF Preselector ﬁ lter is typically only required when the Analog or Digital Sensitivity or

Analog Distortion do not meet published speciﬁ cations, or when the receiver RF frequency is changed

beyond the band pass of the ﬁ lter (typically 5 - 7 MHz in a VHF or UHF 400 MHz receiver). The UHF

700 / 800 / 900 MHz receiver RF Preselector is Full Band and does not require any tuning.

Connect the IFR 2975 and Codan Radio as shown in Figure 5-15.

Figure 5-15: Receiver RF Preselector Tuning

The RF Preselector output is a small RF cable internal in the receiver that terminates in an SMB

connector. The SMB plugs into J3 on the Receiver Mainboard. Disconnect the SMB cable from J3 and

use the SMB-BNC adapter to connect this point to the ANT input on the IFR 2975 as shown in Figure

5-16.

Figure 5-16: Receiver RF Preselector Connection

RECEIVER

NORM

SQ. DISABLE

OFF

CNTL

BUS

RF NI

REF

USB

FREQUENCY (MHz)

MADE IN CANADA

MODEL # CODE

RF Preselector output from Receiver

to ANT input on IFR 2975

T/R port from IFR 2975 to RF IN on Rx

HELP

MODE

TAB

SHIFT

BKSP

HOLD

RETURN

ESC

ENTER

POWER

ABC

DEF

JKL MNOGHI

654

TUV WXYZPQRS

987

#0*

VOLUME

SQUELCH

GEN T/R ANT

125 W MAX

MIC AUDIO I/O

DVMCH2CH1SCOPETEST PORT

100V MAX 100V MAX 100V MAX

VOL

SYSTEM REGULATOR

METER

MADE IN CANADA

OFF

SPKR

INT

EXT

SPKR

OFF

POWER

FUNCTION

To ANT input

on IFR 2975

RF Preselector

output

1 2 ... 35 36 37 38 39 40 41 42 43 44 45 ... 75 76

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