GMDSS Maintainer: Element 9

1. A The local oscillator frequency is beating against the incoming signal to produce an Intermediate Frequency (IF).
2. B The output signal of the Phase Locked Loop (PLL) circuit in the frequency synthesizer has become unlocked.
3. C The discriminator circuit is alternately developing positive and negative voltages at the modulation frequency.
4. D The ratio detector circuit is producing a variable output that deviates across the receiver’s dynamic range.

Tip: press A-D to answer