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86 Preparation for Operation TB7100 Installation and Operation Manual

5. Adjust RV500 (BAL IN) on the rear panel to the required deviation

(typically 60% of full system deviation).

Unbalanced Line 1. Set up the test set to measure the transmitter modulation level.

2. Connect the CTU unbalanced input to the audio output port on the

test set.

3. Set up the test set audio output to be 1kHz at the required line level

(typically 1Vp-p).

4. Activate the Tx Key switch and verify that the transmission is at the

programmed power level and frequency.

5. Adjust RV501 (UNBAL IN) on the rear panel to the required

deviation (typically 60% of full system deviation).

7.3.9 Transmitter Functional Testing

This section describes how to test some parameters commonly found on RF

channel test sheets.

Tx Power and

Frequency

1. Set up the test set to measure frequency and power level.

2. Activate the Tx Key switch on the CTU.

3. Verify that the measured power level and frequency match the

programmed settings, within the expected accuracy of the test set and

taking into account cable losses.

Note If the measured value does not agree with the programmed set-

tings, the transmitter module is either faulty or needs recalibrating.

Audio Distortion When measuring the transmitter audio distortion, the audio input signal can

be via either the balanced or unbalanced audio input.

1. Connect the audio output from the test set to the required CTU

audio input.

2. Set up the modulation analyser in the test set to measure the

distortion of the modulated audio signal.

3. Set up the test set audio generator output to be 1kHz and at the level

required to produce 60% full system deviation (this is the same level

used in the audio level adjustment section).

4. Activate the Tx Key switch and verify that the measured deviation is

60% of full system deviation.

5. The measured distortion level should be within the transmitter

specifications as detailed in the specifications manual.

Tait TB7100 Installation And Operation Manual

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