Use As An Absorption Frequency Meter - Kenwood DM-81 Manual

KENWOOD DM-81
In addition, your DM-81 is applicable as a marker generator by installing a
marker crystal of 1MHz, 3.5MHz, or the like. The marker generator is useful for
calibrating a receiver dial.

Use as an Absorption Frequency Meter

Install an oscillation coil covering the desired frequency range into the socket.
Turn the SENSITIVITY control ON and adjust to the minimum meter deflection
(just before the OFF position of the control), and set the FUNCTION switch to
OSC. You can now use your DM-81 as an absorption frequency meter to receive
external energy and indicate its frequency on the meter.
Figure 8a shows how to measure oscillator frequency. The oscillator coil is
coupled with, or brought near, the absorption frequency meter coil. Adjust the dial
for maximum meter deflection and read the oscillation frequency. Figure 8b
shows the absorption frequency meter coupled to a transmitter tank coil. Its
radiated energy can be measured in a similar manner to that of Figure 8a.
CAUTION: A transmitter power amplifier stage produces high RF energy. The
absorption frequency meter should be brought near the tank coil slowly so the
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