Question T7C02
From subelement T7 - T7C
Which of the following is used to determine if an antenna is resonant at the desired operating frequency?
Why is this correct?
An antenna analyzer is specifically designed to measure antenna characteristics including resonance. At resonant frequency, an antenna's SWR will be 1:1, and the analyzer can directly measure this along with impedance matching. A VTVM measures voltage, a Q meter measures circuit quality factor, and a frequency counter measures frequency - none directly determine antenna resonance like an analyzer does.
Memory tip
Look for test instruments that match their specific measurement purpose. When questions ask about determining antenna characteristics (resonance, SWR, impedance), the answer will be the device specifically designed for antenna analysis, not general-purpose meters that measure other electrical properties.
Learn more
Antenna analyzers serve as comprehensive diagnostic tools for antenna systems, measuring not only SWR but also capacitive and inductive reactance. In practical amateur radio operation, they're invaluable for antenna modeling, feed line troubleshooting, and optimizing frequency privileges across different bands. Many modern analyzers double as RF signal generators, making them versatile for both antenna system evaluation and general RF circuit analysis under Part 97 emission standards.
Think about it
Why do you think an antenna analyzer can determine resonance while a frequency counter cannot, even though both devices work with frequencies?