Shure LX4 Diversity Receiver
8
Preliminary Tests
25D1008 (BK)
Rf Test
Receivers that pass this test do not contain any “drop-out” or “range”
problems.
RF SIGNAL GENERATOR
NOTE: DC VOLTAGES ARE PRESENT AT MOST
RF TEST POINTS. USE A DC BLOCK ON THE
RF SIGNAL GENERATOR TO PROTECT
TEST EQUIPMENT.
12.5 – 18.9 VDC
POWER
RF A RF B
AUDIO
SQUELCH LEVEL
ANTANT
OUTPUTS
HI Z
BAL
MIC LINE
POWER
AB
MARCAD
DIVERSITY
DC BLOCK
LX4 Receiver Rf Signal Generator
Power: ON Frequency: Receiver frequency
Level (gain): Max Modulation: None
Squelch: Mid
Figure 2. Rf Alignment Functional Test Set-Up
For channel A:
1. Set the receiver’s squelch control to its middle position and the
volume control to its maximum position.
2. Set the rf generator to the receiver’s frequency.
3. Remove the receiver’s antenna. Plug the
BNC end of the 50 Ω
test cable into the signal generator and the other end to the
channel A antenna input.
4. Apply power to the LX4.
5. Verify that the unit unsquelches with rf signals greater than
–89 dBm.
6. When the unit unsquelches, verify that the “Rf”
LED glows.
Repeat this test for channel B.