900 MHz RECEIVER
5-11
July 2000
Part No. 001-2000-720
Receiver Hum and Noise Measurement
1. Adjust the RF generator for 100
µ
V into the
receiver with a 1 kHz tone at
±
3 kHz.
2. On the Interface Board, connect a 16 ohm load and
distortion analyzer to J204.
3. Adjust R262 for 2.8V RMS.
4. Remove modulation from the RF generator.
The measured level must be
≤
-45 dB.
Receiver SINAD Measurement
1. Adjust the RF generator for 100
µ
V into the
receiver with a 1 kHz tone at
±
3 kHz.
2. On the Interface Board, connect a 16 ohm load and
distortion analyzer to J204.
3. Adjust R262 for 2.8V RMS.
4. 12 dB SINAD reading should be
≤
0.35
µ
V.
Receiver Squelch Adjustment
1. Adjust the RF generator for 100
µ
V into the
receiver with a 1 kHz tone at
±
3 kHz.
2. On the Interface Board, connect a 16 ohm load
and distortion analyzer to J204.
3. Adjust R262 for 2.8V RMS.
4. Set the RF generator output for 5 dB SINAD.
5. On the Interface Board, adjust R222 so the Receiver
just squelches.
6. Increase the RF generator output until the Receiver
unsquelches. Reading should be
≤
10 dB SINAD.
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.)
Содержание CONVENTIONAL VOTING RECEIVER
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Страница 134: ...POWER SUPPLIES 8 4 July 2000 Part No 001 2000 720 ...
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