Receiver Verification - Ericsson LBI-38953 Maintenance Manual

LBI-38953

RECEIVER VERIFICATION

SINAD
1. Apply a RF generator to the antenna jack at 851.0125
MHz modulated with a 1 kHz tone at 3 kHz deviation.
Set the RF level to -113 dBm.
2. Check for greater than 12 dB SINAD on channel 10
(CLR 1 0 CLR) at the RX AUDIO output J701-5.
3. Repeat the test for channel 649 at 859.0000 MHz and
channel 1208 at 865.9875 MHz.
Audio Output
Refer to Figure 2 for the Test Setup Diagram to measure
audio output.
1. Apply a strong (-60 dBm) on-channel signal modulated
with a 1 kHz tone at 3 kHz deviation to the antenna jack.
18
Figure 2 - Audio Output Test Set-up Diagram
2. Set the volume at 10. Monitor the external outputs at
Duplex Receive Sensitivity
radio with all covers in place. A calibrated attenuator pad (30
dB, 15 watts) must be inserted between the radio's antenna
jack and the RF signal generator to isolate the generator from
the transmitter power.
1. Set the RF generator to 851.0125 MHz and the radio to
2. Turn on the transmitter (FCN 0 1). Measured SINAD
3. Push END to unkey the transmitter. Repeat the above
J905-2,9. The output level should be approximately 6.3
Vrms with less than 5% distortion.
The following test requires a completely assembled
channel 10 (CLR 1 0 CLR). Turn on 1 kHz tone at 3
kHz deviation. Adjust the RF level so -113 dBm will
appear after the attenuator at the radio's antenna jack.
should be greater than 12 dB.
test for channel 649 at 859.0000 MHz and channel 1208
at 865.9875 MHz.
Printed in U.S.A.