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A1. Am, fm, cw, ssb.
A2. It generates an rf carrier at a given frequency within required limits.
A3. Power amplifier.
A4. It converts audio (sound) into electrical energy.
A5. When no modulation is present.
A6. It is an exact multiple of the basic or fundamental frequency.
A7. 600 megahertz.
A8. To obtain higher carrier frequencies.
A9. It saves power and frequency bandwidth.
A10. For operator-to-operator service messages and frequency changes.
A11. Reception, selection, detection, and reproduction.
A12. Sensitivity, noise, selectivity, and fidelity.
A13. Heterodyning.
A14. To extract the modulating audio signal.
A15. Wide bandpass.
A16. A special type of detector and a carrier reinsertion oscillator.
A17. Attenuates the strong and amplifies the weak.
A18. To limit unwanted variations in the output.
A19. Weak signals produce bias, which could result in no usable receiver output.
A20. Dagc does not attenuate weak signals.
A21. It is heterodyned with the rf to produce an audio frequency.
A22. It eliminates noise when no signal is being received.
A23. It controls the amount of bass and treble response.
A24. It is used to achieve maximum selectivity.
A25. It is used to accurately control the frequency of the oscillator.
A26. The process of selecting and/or heterodyning frequencies to produce a signal frequency.

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