Crown Low Power Transmitters - Crown Broadcast
Crown Low Power Transmitters - Crown Broadcast
Crown Low Power Transmitters - Crown Broadcast
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5.14 Audio Frequency Response<br />
For the response tests, take the readings from an FM modulation monitor.<br />
Make audio frequency response measurements for left and right channels at<br />
frequencies of 50 Hz, 100 Hz, 400 Hz, 1 kHz, 5 kHz, 10 kHz, and 15 kHz. See<br />
sections 5.9.1 and 5.9.2.<br />
5.15 Audio Distortion<br />
Make distortion measurements from the de-emphasized output of an FM<br />
modulation monitor.<br />
Make audio distortion measurements for left and right channels at frequencies of<br />
50 Hz, 100 Hz, 400 Hz, 1 kHz, 5 kHz, 10 kHz, and 15 kHz. See sections 5.9.1 and<br />
5.9.2.<br />
5.16 Modulation Percentage<br />
While feeding an audio signal into the left channel only, confirm that the total<br />
modulation percentage remains constant when switching between Mono and<br />
Stereo.<br />
Measure modulation percentage with an FM modulation monitor.<br />
See section 5.2.2.<br />
19–kHz pilot modulation should be 9%.<br />
5.17 FM and AM Noise<br />
Take noise readings from a de-emphasized output of a modulation monitor.<br />
5.18 Stereo Separation<br />
Make left-into-right and right-into-left stereo separation measurements with an<br />
FM modulation monitor for frequencies of 50 Hz, 100 Hz, 400 Hz, 1 kHz, 5 kHz,<br />
10 kHz, and 15 kHz.<br />
5.19 Crosstalk<br />
For stereo crosstalk measurements, both left and right channels are fed at the<br />
same time. For best results, there needs to be a means of correcting small<br />
imbalances in levels and phase. The balance is made at 400 Hz.<br />
Adjustments and Tests<br />
5–9
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