Shure U1 Service Manual page 9

25C1021 (BG)
Shure U1/U1L Body-Pack UHF Transmitter
Frequency Response
If the U1 has an attenuator switch on the back of the unit,
it should be set to –6 dB for the following tests (versions G or later).
Values between board versions may vary slightly; the following values
are typical values.
1. With the transmitter set to minimum gain, apply 200 mVrms
at 1 kHz to its input.
2. Connect the audio analyzer's input to the unbalanced output of
the U4 receiver.
3. Make sure the receiver volume control is set to maximum.
4. With respect to the 1 kHz level, measure –8.22 dBu ± 2 dB.
5. Change the frequency to 100 Hz. Verify that the measurement
from the U4 unbalanced output is within ± 2 dB with respect to
the 1 kHz level.
6. Change the frequency to 10 kHz. Verify that the measurement
from the U4 unbalanced output is within ± 2 dB with respect to
the 1 kHz level.
7 Preliminary Tests