Receiver Setup; Deviation Reference Level; Radiated Deviation Reference Voltage - Shure SLX2 Service Manual

25A1090 (Rev.3)

RECEIVER SETUP

SLX4 RECEIVER
Output: Unbalanced
Gain: Maximum
Toke Key: Disabled (R280)
1. The SLX2 transmitter should be powered OFF for this procedure.
2. Connect the rf signal generator to any of the antenna inputs on the receiver. Make sure the
dc block is on the rf signal generator.
3. Set rf signal generator to the same frequency as the SLX2 transmitter.
4. Set rf signal generator modulation to 1 kHz and deviation to 33 kHz.
5. Set the amplitude of the rf signal generator to -50 dBm.
6. Disable tonekey by shorting the pads of R280 on the receiver.

DEVIATION REFERENCE LEVEL

1. Power ON the receiver.
2. Connect the unbalanced output of the SLX4 receiver to the audio analyzer input.
3. Note the voltage obtained. This is the deviation reference voltage.
4. Disconnect the rf signal generator from the SLX4.
5. Power OFF the receiver and remove the short on the R280 pads to enable tonekey.

RADIATED DEVIATION REFERENCE VOLTAGE

SLX2 TRANSMITTER
Atennuation:
1. Connect the audio analyzer output to the Mic Test Head input of the transmitter.
2. Power ON the receiver.
3. Apply +3V to the battery terminals on the SLX2 and power up the unit.
4. Set the audio analyzer frequency to 1kHz.
5. Adjust the audio analyzer amplitude level (typically = -6.5 dBu) to obtain -13 dBu ± 0.1dB
at TPA1. (This corresponds to -9 dBu ± 2dB at the audio input (TPA0)).
6. Adjust TR160 to obtain -3 dBu ± 0.15dB at TPA2.
7. Place the transmitter closer than 12 inches (36 cm) to the receiver.
8. Connect both antennas on the receiver.
9. Connect the unbalanced output of the receiver to the audio analyzer.
10. Adjust TR200 until the ac voltmeter connected to the receiver unbalanced output reads the
same deviation reference voltage ± 0.1dB, as measured above.
(TR200 adjusts the deviation for 33 kHz, 100% modulation.)
If successful in the alignment of the unit, assemble it back together as indicated on
page 12. If not successful refere to our Bench Checks section on page28.
AUDIO ANALYZER
Measurement: AC level
Filters:
Low-Pass (30 kHz): ON
High-Pass (400 Hz): ON
Power: +3 Vdc
-10 dB
Channel: See Table
Group: See Table
16
RF SIGNAL GENERATOR
FM RATE: 1kHz
Amplitude: -50 dBm
Deviation: 33 kHz
AUDIO ANALYZER
Measurement: AC level
Output: 1 kHz
Filters:
Low-Pass (30 kHz): ON
High-Pass (400 Hz): ON
INT: FM