Codan-radio MT-4E Analog and P25 Digital - Maintenance Guide Manual do Utilizador Página 69
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MT-4E ANALOG & P25 DIGITAL RADIO SYSTEMS | MAINTENANCE GUIDE
Chapter 6: Additional Radio System Tests Page 61
RF Carrier Signal Levels on Links between Sites
When linking two radio systems together it is advantageous to test the RF signal strength between
the linked sites. A carrier signal level test can be performed by keying up the transmitter that links
to the radio site under test and measuring the RF carrier level at the receive antenna. Keying up the
transmitter at the other site can be done with a portable radio at your location, or by having someone
else key that link with a portable or base station. Measurement of the RF carrier level can be performed
by two different methods.
The fi rst method to measure the RF carrier signal level is by connecting a switched RF attenuator
between the antenna port of the fi ltering equipment and the antenna as shown in Figure 6-4. Switch the
attenuator just until the receiver squelches and note the amount of attenuation. This is the fade margin
of the RF carrier signal on that link.
The second method to measure the RF carrier signal level is to measure the RSSI of the Receiver
(either by the voltage output on the System Regulator or the RSSI meter built into the Service section
of the RSS). Note the RSSI level, then connect a test set to the antenna port of the fi ltering equipment
and adjust the RF carrier level until the noted RSSI level is achieved. This is the received RF carrier
level on that link.
Figure 6-4: RF Carrier Level on Link Test
Portable
Repeater
Site B
Repeater
Site A
LINK ANTENNA
Switched AttenuatorRF Carrier Signal
between Sites
LINK
ANTENNA
Filtering
Equipment
TRANSMITTER
CNTL
BUS
MIC RF OUT
AD
ANALOG
DIGITAL
NORM
OFF
KEY TX
MICMODE
REF
IN
USB
FREQUENCY (MHz)
MADE IN CANADA
MODEL # CODE
RECEIVER
NORM
SQ. DISABLE
OFF
CNTL
BUS
AD
RF NI
REF
IN
USB
FREQUENCY (MHz)
MADE IN CANADA
MODEL # CODE
VOL
SYSTEM REGULATOR
METER
+
-
MADE IN CANADA
ON
OFF
SPKR
INT
EXT
EXT
SPKR
OFF
POWER
ON
2
1
5
4
3
67
8
11
10
9
FUNCTION
12
REPEATER
CONTROL
RX B
TX B
RX A
TX A
PULL DOWN
TO REMOVE
9
5
3
7
11
15
9
13
3
7
11
15
SWITCH A SWITCH B
TRANSMITTER
CNTL
BUS
MIC RF OUT
AD
ANALOG
DIGITAL
NORM
OFF
KEY TX
MICMODE
REF
IN
USB
FREQUENCY (MHz)
MADE IN CANADA
MODEL # CODE
RECEIVER
NORM
SQ. DISABLE
OFF
CNTL
BUS
AD
RF NI
REF
IN
USB
FREQUENCY (MHz)
MADE IN CANADA
MODEL # CODE
TRANSMITTER
CNTL
BUS
MIC RF OUT
AD
ANALOG
DIGITAL
NORM
OFF
KEY TX
MICMODE
REF
IN
USB
FREQUENCY (MHz)
MADE IN CANADA
MODEL # CODE
RECEIVER
NORM
SQ. DISABLE
OFF
CNTL
BUS
AD
RF NI
REF
IN
USB
FREQUENCY (MHz)
MADE IN CANADA
MODEL # CODE
VOL
SYSTEM REGULATOR
METER
+
-
MADE IN CANADA
ON
OFF
SPKR
INT
EXT
EXT
SPKR
OFF
POWER
ON
2
1
5
4
3
67
8
11
10
9
FUNCTION
12
REPEATER
CONTROL
RX B
TX B
RX A
TX A
PULL DOWN
TO REMOVE
9
5
3
7
11
15
9
13
3
7
11
15
SWITCH A SWITCH B
TRANSMITTER
CNTL
BUS
MIC RF OUT
AD
ANALOG
DIGITAL
NORM
OFF
KEY TX
MICMODE
REF
IN
USB
FREQUENCY (MHz)
MADE IN CANADA
MODEL # CODE
RECEIVER
NORM
SQ. DISABLE
OFF
CNTL
BUS
AD
RF NI
REF
IN
USB
FREQUENCY (MHz)
MADE IN CANADA
MODEL # CODE
- MT-4E Analog and 1
- P25 Digital 1
- Radio Systems 1
- Codan MT-4E 3
- Analog and 3
- Page ii 4
- Page iii 5
- Page iv 6
- Contents 7
- Page vi 8
- INTRODUCTION TO CODAN MT-4E 9
- REPAIR NOTE 10
- ESD - ELECTROSTATIC DISCHARGE 10
- Audio Levels 11
- Carrier Levels 11
- CHAPTER 2: INSTALLATION 13
- Chapter 2: InstallationPage 6 14
- Chapter 2: InstallationPage 8 16
- RECOMMENDED TEST EQUIPMENT 17
- RECOMMENDED SPARES 18
- RECOMMENDED MAINTENANCE ITEMS 19
- CHAPTER 4: RADIO SITE SURVEY 21
- PREPARATION FOR A SITE SURVEY 22
- EXTERIOR SITE SURVEY 23
- INTERIOR SITE SURVEY 23
- RADIO SITE INVENTORY 23
- RADIO SYSTEM TESTING 24
- DEPARTURE CHECKLIST 24
- Radio Service Software (RSS) 27
- Control Cards 27
- Audio Connections 29
- SYSTEM REGULATOR TESTING 30
- RECEIVER TESTING 31
- Audio Distortion: 32
- Reference Sensitivity: 33
- Squelch: 33
- Audio Level: 34
- Receiver Digital Testing 36
- Computer running RSS 38
- USB from 38
- Computer to Rx 38
- RECEIVER 40
- GEN T/R ANT 40
- SYSTEM REGULATOR 40
- -4E Test Sheet 44
- TRANSMITTER TESTING 45
- RF Power: 47
- Deviation Level: 48
- Transmitter CTCSS Testing 50
- Transmitter Digital Testing 53
- Computer to Tx 55
- SYSTEM TESTING 59
- Demodulated Audio Frequency: 60
- Distortion: 60
- Duplex Digital Testing 62
- Unit ID (SID): 64
- Emergency Bit (EMG): 64
- Algorithm ID: 64
- EQUIPMENT 66
- CONNECTED 67
- Receiver Desense 68
- LINK ANTENNA 69
- Spurious Signals over the Air 70
- CHAPTER 7: BLANK WORKSHEETS 71
- Radio Site Inventory 72
- MT-4E Radio System Test Sheet 73
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