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T7A10

PRACTICAL CIRCUITS · Station equipment: receivers, transceivers, transmitter amplifiers, RF preamplifiers, transverters; Basic radio circuit concepts and terminology: sensitivity, selectivity, mixers, oscillators, Push-To-Talk (PTT), VFO, modulation

T7A10T7A →

What can be added to the output of a transceiver to increase the transmitted output power?

  1. AA potentiometer
  2. BAn RF power amplifier
  3. CAn impedance multiplier
  4. DAll these choices are correct
Why Transmitted power is increased by feeding the transceiver's output into an RF power amplifier, a stage that takes the low-level drive signal (often 5 to 100 watts) and amplifies it to a higher output level. In amateur practice this external box is called a linear amplifier or just an amp, and it must preserve the modulation waveform for SSB and digital modes. Note that the total station output still has to stay within the power limits of 97.313.
Watch out A potentiometer is just a variable resistor used to adjust voltage or level in low-power control circuits, and it would only waste RF power as heat; an 'impedance multiplier' is not a real station component, though impedance matching networks do exist and they transform impedance without adding power.
More watts out means more amplification: only an RF power amplifier adds power. Resistors and matching networks never create power.
HamSandwich explanation, first draft. The question and answers are the NCVEC text.
← T7A09 All of T7A T7A11 →

The rest of T7A

  1. T7A01 Which term describes the ability of a receiver to detect the presence of a signal?
  2. T7A02 What is a transceiver?
  3. T7A03 Which of the following is used to convert a signal from one frequency to another?
  4. T7A04 Which term describes the ability of a receiver to discriminate between multiple signals?
  5. T7A05 What is the name of a circuit that generates a signal at a specific frequency?
  6. T7A06 What device converts the RF input and output of a transceiver to another band?
  7. T7A07 What is the function of a transceiver's PTT input?
  8. T7A08 Which of the following describes combining speech with an RF carrier signal?
  9. T7A09 What is the function of the switch which selects either SSB or CW-FM on some VHF power amplifiers?
  10. T7A10 What can be added to the output of a transceiver to increase the transmitted output power?
  11. T7A11 What is the function of the Variable Frequency Oscillator (VFO) circuit in a transceiver?
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