Modern reserve transmitters are solid-state designs and transmit using only A2 modulation. When measuring transmitter center frequency, what precaution must be taken:
⢠A2 modulation meaning (continuous carrier amplitude modulated with a tone) ⢠How sidebands are created and how to make a "pure" carrier for frequency measurement ⢠Which transmitter parameter you can safely change in normal testing without damaging equipment
⢠When you want to measure the center frequency of a transmitter, do you want sidebands present or do you want as close to a single carrier as possible? ⢠Which of the listed actions directly affects the presence of modulation sidebands, and which ones mainly affect power level or antenna characteristics? ⢠Which option sounds like a standard test-lab procedure you could repeat safely on many units, rather than something extreme or unusual?
⢠Be clear on what A2 modulation is and how modulation depth affects sidebands. ⢠Identify which choice, if any, actually changes modulation rather than antenna or power amplifier hardware. ⢠Ask yourself: for a frequency counter or service monitor reading, what condition on the signal makes the reading most accurate?
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