8. RECEIVER ALIGNMENT
8.1 Set the unit/equipment for RX Test
(SEE FIGURE 3).
Set the RF Generator level to –47dBm. The
generator should be set for 1.5kHz deviation at 1kHz modulation. Set the Impedance at
8ohms
.
8.2 Set
Filter 1
to 25Hz and
Filter 2
to 15kHz.
8.3 Set the unit at PMR Ch1. Set the
Volume level for 4
(default Level ). Align CF2 for maximum level.
Check the audio level, should be
0.27~0.6Vrms
8.4 Confirm that the RX Distortion is less than 5%.
8.5 Reduce the RF Generator signal level until a 12dB Sinad reading is achieved. The RF Generator level
should be less than –120dBm.
8.6 Set the RF Generator level to –47dBm, and set the unit Volume Level to maximum.
8.7 Check the maximum Audio Output Level, should be
>1.70Vrms
.
8.8 Set the unit at LPD Channel 1.
8.9 Set the RF generator at 3.0kHz deviation at 1kHz modulation.
8.10 Repeat Procedure 8.5 and confirm that the RF Generator is less than –122dBm at 12dB SINAD.
9. SQUELCH THRESHOLD AND HYSTERISIS
9.1 Set unit same as 8.1.
9.2 Set the RF Generator level until unit is at 2dB Sinad or unit is squelched (RX Off).
9.3 Slowly increase the RF Signal Generator level until the unit un-squelches (RX On), confirm that the
sensitivity is between
6~14dB SINAD (PMR Band)
.
10. VOX TEST
10.1 Set the unit into VOX Mode (Level 2). The VOX icon should be displayed on the LCD.
10.2 Connect an audio generator into the microphone terminal. The audio frequency should be set for 1kHz
frequency with a level of 0mVrms and the output should be turned off.
10.3 Turn on the output of the audio generator.
10.4 Increase the Audio Generator level until unit goes into TX Mode.
10.5 Check the Generator level, it should be between
0.8 ~ 2.0mV
.
11. LOW BATTERY LEVEL TEST
11.1 Set the unit into standby mode.
11.2 Set the Power Supply voltage to 4.8Vdc.
11.3 Slowly decrease the Power Supply Voltage until the Battery icon appears and blink.
11.4 Observe the Power Supply Level. The level must be between
4.1
to
4.4
Vdc
Created by:
Approved by:
Rev. No:
For Stage :
Release Date :
Page 15 of 49
Summary of Contents for MT-4040
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