800 MHz RECEIVER
4-11
July 2000
Part No. 001-2000-720
Receiver Data Level Adjustment
1. Adjust the RF generator for 100
µ
V into the
receiver with a 100 Hz tone at
±
1 kHz.
2. Insert voltmeter probes into J202 on the Interface
Board and connect to an AC voltmeter.
3. Adjust R248 to achieve 340 mV RMS (-7.1 dBm).
Receiver RSSI Adjustment
NOTE: Use this procedure only when an audio analyz-
er is unavailable.
1. Adjust the RF generator for 0.29
µ
V into the
Receiver with a 1 kHz tone at
±
3 kHz.
2. Adjust R261 in the Receiver for 0.8V DC (
±
0.02V
DC) at TP3.
Receiver Miscellaneous Tests (Optional)
Several additional tests may be performed on the
Receiver as listed below:
•
Signal Displacement Bandwidth
•
Adjacent Channel Rejection
•
Offset Channel Selectivity
•
Intermodulation Rejection
•
Spurious Rejection
•
Audio Response
•
Audio Sensitivity
Perform the Test desired using the appropriate RF
Generators, modulation frequencies, levels, RS-232
levels and test probes following the latest TIA docu-
ment measurement procedures.
Handshake Test
1. Program a portable or mobile for the
following parameters.
Home Repeater - Same as repeater number.
System Key - Same as repeater
Status Channel - Same as repeater channel.
Home Channel - Same as repeater channel.
Encode ID = 1
Decode ID = 1
UID = 1
Site = 1
2. The repeater is now in Normal Operation mode.
3. Key the radio several times on the programmed
System/Group. Display shall indicate "4" every
time. (Proper Tx/Rx antenna connections are
assumed.)
Alarm Test
1. The CVR is now in Normal Operation mode.
2. Verify the front panel display does not indicate any
alarms (see Table 4-1).
4.4.3 VOTER INTERFACE
CVR Audio Level Adjustment
1. Adjust the RF generator for 100
µ
V into the
receiver with a 1 kHz tone at ±1.5 kHz.
2. Connect a balanced AC voltmeter between J205,
pin 2 and J206, pin 2. Connect a 600 ohm termina-
tion to the meter terminals or across J101, pins 5/6.
3. On the Interface Board, adjust R271 for the type of
line.
Leased Line/Direct Connect (default)
-12 dBm (194 mV RMS)
Table 4-1 ALARMS
Display No.
Definition
0
1
2
3
4
5
6
7
8
9
A
B
C
D
E
F
Test Mode
Not Used
Normal Operation
Revert Operation
Receiving Data
Not Used
Not Used
Receive Synthesizer Out of Lock
High Stability Synth Out of Lock
Data Processor Failure
Not Used
Not Used
Downloading Code
Not Used
Erasing Code
Failure
Содержание CONVENTIONAL VOTING RECEIVER
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