MT-4E Analog and P25 Digital Radio Systems - Daniels Electronics

TEST PORT
SCOPE
100V MAX 100V MAX 100V MAX
CH1
CH2
DVM
MIC
HELP
RETURN
AUDIO I/O
MODE
TAB
SHIFT
BKSP
HOLD
GHI
4
PQRS
7
*
JKL
5
TUV
8
0
MNO
6
WXYZ
9
ESC ENTER POWER
#
125 W MAX
VOLUME
SQUELCH
USB
CNTL
BUS
A
D
FREQUENCY (MHz)
SQ. DISABLE
NORM
OFF
REF
IN
MADE IN CANADA
MODEL # CODE
RF
IN
FUNCTION
12
1
11
2
10
3
9
4
8
5
7 6
+
VOL METER
-
EXT
SPKR
MADE IN CANADA
OFF
34
Chapter 5: Daniels Radio System Testing
Receiver Reference Oscillator Adjustment
Connect the IFR 2975 and Daniels Radio as shown in Figure 5-18.
Computer running RSS
Synthesizer L.O. output from Receiver
to ANT input on IFR 2975
ABC
1 2
3
DEF
+
-
RECEIVER
SYSTEM REGULATOR
.
POWER
ON
GEN T/R ANT
ON
OFF
SPKR
INT
EXT
DANIELS
ELECTRONICS LTD.
DANIELS
ELECTRONICS LTD.
USB from
Computer to Rx
Figure 5-18: Receiver Reference Oscillator Testing
The reference oscillator test on the receiver requires a connection directly into the Synthesizer, which
uses an SMB connector. Disconnect the SMB cable from the LO output of the synthesizer and connect
the small SMB-SMB cable to the SMB jack that is mounted on the Synthesizer (beneath the RF
Preselector). The SMB-BNC adapter is required to connect this point to the ANT input on the IFR 2975
as shown in Figures 5-19 (VHF and UHF 400 MHz Receiver) and 5-20 (UHF 800 MHz Receiver).
LO output of
synthesizer
SMB-SMB
cable
To ANT input
on IFR 2975
Figure 5-19: VHF and UHF 400 MHz Receiver Reference Oscillator Connection
Maintenance
Guide
MG-001 Daniels MT-4E Radio Systems
www.danelec.com