Broadcast Tools SS 2.1/Terminal III Manual do Utilizador descarregar pdf (Página 105)

Section 5: Module Configuration 5-15

Moseley SL9003Q 602-12016 Revision G

5.6.3. Measuring Carrier Frequency — TX

Typically it will not be necessary to measure the transmit carrier frequency. Starlink

transmit carrier is derived from a very stable 0.1 ppm OCXO (ovenized controlled crystal

oscillator) and is factory calibrated to an ovenized frequency reference.

However if it is required to measure the carrier frequency this may be achieved by

entering the factory calibration menu tree. Here is how:

1. Connect a 30 dB, 5 Watt or greater RF attenuator to the transmitter output.

2. Connect a frequency counter capable of 0.1ppm or better accuracy at 1 GHz to

the rf attenuator.

3. Connect AC power to the SL9003Q transmitter unit.

4. Following the “Factory Calibration” menu tree of 4.2C, navigate to the “QAM

Modem”, and enter the “OCXO” screen. Enable “CW Mode” to “ON”. This will

disable modulation on the carrier so that the carrier frequency may now be

measured.

5. Measure the frequency. Set the “CW Mode” to “OFF”.

5.7 Power Amplifier

There are no user adjustments on this module.

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Broadcast Tools SS 2.1/Terminal III Manual do Utilizador Página 105