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
32
Chapter 5: Daniels Radio System Testing
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
800 MHz receiver RF Preselector is Full Band and does not require any tuning.
Connect the IFR 2975 and Daniels Radio as shown in Figure 5-15.
RF Preselector 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.
T/R port from IFR 2975 to RF IN on Rx
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.
J3
RF Preselector
output
Figure 5-16: Receiver RF Preselector Connection
To ANT input
on IFR 2975
Maintenance
Guide
MG-001 Daniels MT-4E Radio Systems
www.danelec.com