April 16, 2014

FCC Technician Exam Question Of The Day (T8C02)

Q) Which of these items would be useful for a hidden transmitter hunt?

A) A directional antenna

NJ2X Notes:
Direction antennas often seen in transmitter hunting include the dipole, Yagi, and Loop antennas.

Radio direction finding loop antenna and equipment by LZ1ADF

April 15, 2014

FCC Technician Exam Question Of The Day (T7D02)

Q) What is the correct way to connect a voltmeter to a circuit?

A) In parallel with the circuit

NJ2X Notes:
Connecting a voltmeter to a circuit in parallel allows the measurement of the voltage drop across the circuit.

April 14, 2014

FCC Technician Exam Question Of The Day (T8C03)

Q) What popular operating activity involves contacting as many stations as possible during a specified period of time?

A) Contesting

 NJ2X Notes:
Radio contesting is great fun and enjoyed by a growing number of hams world wide.  Besides the fun factor, radio sports sharpen operating skills and encourage people to stay active on the air.

April 13, 2014

FCC Technician Exam Question Of The Day (T7D04)

Q) Which instrument is used to measure electric current?

A) An ammeter

NJ2X Notes:
An ammeter is a measuring instrument used to measure the electric current in a circuit. Electric currents are measured in amperes (A).


April 12, 2014

FCC Technician Exam Question Of The Day (T9B03)

Q) Why is coaxial cable used more often than any other feedline for amateur radio antenna systems?

A) It is easy to use and requires few special installation considerations

NJ2X Notes:
Coaxial cable has many advantages for radio amateurs.  Here are a few:
  • Can be buried or placed on the ground
  • Can be routed in close proximity to metallic objects
  • Can be easily pulled through walls and conduit
  • Relatively low feed line loss
  • Easy on/off connectors
  • Long lasting and durable
  • Waterproof
  • Doesn't radiate (in most applications)
  • Shields the signal carried on the cable from interference

April 11, 2014

Pure or applied science...

Frequently, I have been asked if an experiment I have planned is pure or applied science; to me it is more important to know if the experiment will yield new and probably enduring knowledge about nature. If it is likely to yield such knowledge, it is, in my opinion, good fundamental research; and this is more important than whether the motivation is purely aesthetic satisfaction on the part of the experimenter on the one hand or the improvement of the stability of a high-power transistor on the other. — William B. Shockley

William B. Shockley; photo by Chuck Painter / Stanford News Service

FCC Technician Exam Question Of The Day (T8B02)

Q) How much transmitter power should be used on the uplink frequency of an amateur satellite or space station?

A) The minimum amount of power needed to complete the contact

NJ2X Notes:
QRP (low power) operators already understand the meaning of this rule.  They accomplish DX (long distance) contact with just a few watts or sometimes even miliwatts.  It is rather fun to turn down the power during a contact to see "how low you can go".

This rule becomes even more critical with a space station since transmitting on the uplink at greater power than necessary increases the chances you will cause harmful interference.

April 10, 2014

FCC Technician Exam Question Of The Day (T6D05)

Q) What type of circuit controls the amount of voltage from a power supply?

A) Regulator

NJ2X Notes:

The objective for a voltage regulator is to provide constant DC output voltage and to continuously hold the output voltage at the design value regardless of changes in load current or input voltage.