CESSNA AIRCRAFT COMPANY FOR TRAINING USE ONLY
MODEL 152 9-16
Figure 1. Cessna 300 Nav/Com (Type RT-328T)
1. RECEIVER-TRANSMITTER FREQUENCY INDICATOR.
2. NAVIGATION RECEIVER FREQUENCY INDICATOR.
3. SQUELCH CONTROL – used to adjust signal threshold necessary to activate communication receiver
audio. Clockwise rotation increases background noise (decreases squelch action); counterclockwise
rotation decreases background noise.
4. COMMUNICATION RECEIVER-TRANSMITTER MEGAHERTZ SELECTOR – Selects communication
receiver-transmitter frequency in 1-MHz steps between 118 and 135 MHz.
5. OFF/ON VOLUME CONTROL – Turns set on and controls volume of audio from communications
receiver.
6. COMMUNICATION RECEIVER-TRANSMITTER FRACTIONAL MEGAHERTZ SELECTOR – Selects
communication receiver-transmitter fractional frequency in .05-MHz steps between .000 and .950
MHz or between .025 and .975 MHz depending on position of 50-25 MHz selector switch (7).
7. 50-25 FRACTIONAL MHz SELECTOR SWITCH – In “50” position, enables communication whole MHz
frequency readout to display and communication fractional MHz control to select fractional part of
frequency in .05-MHz steps between .000 and .950 MHz. In “25” position, frequency display and
coverage is in .05-MHz steps between .025 and .975.
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