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Հարց 160

Why should the ALC system be inactive when transmitting AFSK data signals?

  1. ALC will invert the modulation of the AFSK mode
  2. The ALC action distorts the signalՃիշտ պատասխան
  3. When using digital modes, too much ALC activity can cause the transmitter to overheat
  4. All these choices are correct

Բացատրություն

AFSK data uses a constant-amplitude tone, so if ALC acts it varies gain dynamically during transmission and distorts the signal, spreading nonlinear mixing products into adjacent frequencies. Drive should be set low enough that the ALC circuit never acts at all.

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Հարց 160: Why should the ALC system be inactive when transmitting… · FCC General Class (Element 3) · Questena