Antenna Resonant Frequency Measurement - Kenwood DM-81 Manual

KENWOOD DM-81

Antenna resonant frequency measurement

Any antenna can be regarded as a kind of resonant circuit. Its resonant frequency,
therefore, can be measured as illustrated in Figure 5. For measurement, connect a
one-turn coil to the feed point at the center of the antenna.
Couple it with the dip meter coil. Now, you can obtain the antenna resonant
frequency in a similar manner to APPLICATIONS Section A. For a vertical
antenna or similar antennas for which the other feeder lead is grounded, place the
one-turn coil between the antenna and ground.
Couple the one-turn coil to the dip meter until a dip point is obtained. Then,
slowly separate the coil to measure the resonant frequency accurately.
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