Technician License CourseChapter 2

Lesson Plan Module 3 –

Radio Equipment Basics

The Basic Radio Station

Basic Station Organization

• Station Equipment– Receiver– Transmitter– Antenna– Power Supply

• Accessory Station Equipment• Microphones, speakers, Morse Code keys

Transmit/Receive (TR) Switch

• If the station antenna is shared between the transmitter and receiver, the TR switch allows the antenna to be switched to the transmitter when sending and to the receiver when receiving.– In a transceiver, this TR switch is inside the unit and

requires no attention by the operator.

Special Stations You Will Use (Repeaters)

• Repeaters are automated stations located at high places that receive and then retransmit your signal – simultaneously.– Dramatically improves range of low power or

mobile stations.

• The basic components of a repeater are the same as your station: receiver, transmitter, antenna and power supply.

Repeaters

• But, repeaters are transmitting and receiving at the same time using the same antenna.

• This requires a very high quality and specialized filter to prevent the transmitted signal from overpowering the receiver.

• This specialized filter is called a duplexer.

Repeaters

• Repeater Station Equipment– Receiver– Transmitter– Antenna– Power Supply– Duplexer– Controller

Repeater

Basic Station Accessories

• Human interface accessories:– Microphones– Speakers– Earphones– Computer– Morse code key– TV camera– Etc.

• Station performance accessories:– Antenna tuner– SWR meter (antenna

match checker)– Amplifier– Antenna rotator

(turning antenna)– Filters– Etc.

Accessory Equipment

What type of amateur station simultaneously retransmits the signal of another amateur

station on a different channel or channels? (T1F09)

• A. Beacon station

• B. Earth station

• C. Repeater station

• D. Message forwarding station

What type of amateur station simultaneously retransmits the signal of another amateur

station on a different channel or channels? (T1F09)

• A. Beacon station

• B. Earth station

• C. Repeater station

• D. Message forwarding station

What could be used in place of a regular speaker to help you copy signals in a noisy

area? (T4A02)

• A. A video display

• B. A low pass filter

• C. A set of headphones

• D. A boom microphone

What could be used in place of a regular speaker to help you copy signals in a noisy

area? (T4A02)

• A. A video display

• B. A low pass filter

• C. A set of headphones

• D. A boom microphone

If Figure T5 represents a transceiver in which block 1 is the transmitter portion and block 3 is the receiver portion, what is the function of block 2?

(T7A07)

• A. A balanced modulator• B. A transmit-receive switch• C. A power amplifier• D. A high-pass filter

If Figure T5 represents a transceiver in which block 1 is the transmitter portion and block 3 is the receiver portion, what is the function of block 2?

(T7A07)

• A. A balanced modulator• B. A transmit-receive switch• C. A power amplifier• D. A high-pass filter

• Reading Assignment: Chapter 3