Deviation Adjustment; Distortion Adjustment - Shure T2 Service Manual

25C1018 (CC)
Shure T2 Vocal Artist Microphone Transmitter
4. Make sure that the receiver's yellow
5. Set the receiver's Volume control to the maximum position (full
clockwise rotation) and apply power to the receiver. On the T4,
set the Squelch control to its midpoint.
6. Measure the rms voltage developed across the unbalanced out-
put of the receiver. The reading should be approximately 0 dBu
(775 mV), which corresponds to a deviation level of 15 kHz.
Record this voltage as the Deviation Reference Voltage.
Note: At this point you may want to press the Log/Lin button on
the audio analyzer (to measure in dBm) and then press the Ratio
button to perform the relative measurement in the next section.
7. Turn off the
RF
I: Deviation Adjustment
1. Make sure that C240 is on the
connected).
2. Remove the power-supply leads and attach a new 9 V battery.
3. Connect the output of the audio analyzer to the test head.
4. Set the frequency of the audio analyzer to 1 kHz. Make sure that
0 dBu (775 mV) is present at the positive side of C107.
5. Measure the rms voltage at the unbalanced output of the receiv-
er. Adjust R217 to obtain voltage within ±1 dB of the deviation
reference voltage that you recorded earlier (see the end of the
preceding subsection).
J: Distortion Adjustment
1. Set the audio analyzer for "Distn" (total harmonic distortion).
2. Adjust R130 for minimum distortion out of the receiver (it should
measure less than 1%).
Note: This completes the alignment procedures. Refer to the "Reas-
sembly" instructions earlier in this manual.
21
RF LED
output from the signal generator.
board, so that the antenna is
RF
Service Procedures
lights.