Sec 1: 5-12 Performance Checks: Receiver Performance Checks
5.4 Receiver Performance Checks
The following tables outline the performance checks for the receiver.
Table 5-7. Receiver Performance Checks
Test Name System Analyzer Radio Test Set Comments
Reference
Frequency
RF Control: Monitor
Meter: RF Display
Display: Bar Graphs
Freq: Selected radio TX
freq.
TEST MODE CSQ
channel* or
programmed
conventional
channel
PTT to continuous
(during the
performance
check)
VHF: ±0.8 ppm
(±227 Hz)
UHF1: ±0.8 ppm
(±289 Hz)
UHF2: ±0.8 ppm
(±329 Hz)
700-800 MHz: ±0.8 ppm
(±709 Hz)
Rated Audio RF Control: Gen
Output Level: -47 dBm
Freq: Selected radio RX
freq.
Mod: 1kHz tone @ 3kHz
dev.
Meter: AC Volts
As above PTT to OFF
(center)
Load Selector: A
Set volume control to
3.74 Vrms
Distortion As above, except
Meter: Ext Dist.
As above As above Distortion < 3.0%
Sensitivity
(SINAD)
As above, except
Meter: SINAD
As above As above RF input to be < 0.35 µV
Noise Squelch
Threshold
(only radios
with
conventional
system need
to be tested)
Set as for rated audio
check
Out of TEST
MODE; select a
conventional
system
As above Set volume control to
3.74 Vrms.
Set RF level to -130 dBm
and raise until radio
unsquelches.
Unsquelch to occur at
< 0.25 µV. Preferred SINAD
= 6-8 dB.
* See Table 5-4 on page 1:5-6.
Table 5-8. Receiver Tests for ASTRO Conventional Channels*
Test Name System Analyzer Radio Test Set Comments
Bit Error rate
(BER) Floor
Mode: Proj 25 Std
RF Control: Gen
Output Level: -47 dBm
Proj 25 Dev: 2.83 kHz
Code: 1011 Hz PAT
Radio Tuner
Software (Bit Error
Rate screen) is
required
PTT to OFF
(center)
BER < 0.01%
(Use test setup shown in
Figure 6-1 on page 1:6-1)
Reference
Sensitivity
As above; lower the
output level until 5% BER
is obtained
As above As above Output level < 0.35 µV
(-116 dBm)
(Use test setup shown in
Figure 6-1 on page 1:6-1)
To Next Page
Loading...
Need help?
General
