Technician License Course Chapter 3 Operating Station Equipment Repeater Operation and Data Modes.

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Presentation transcript:

Technician License Course Chapter 3 Operating Station Equipment Repeater Operation and Data Modes

What is a Repeater? Specialized transmitter/receiver interconnected by computer controller Generally located at a high place Receives your signal and simultaneously re- transmits your signal on a different frequency Dramatically extends line-of-sight range –If both users can see the repeater site

A Little Vocabulary First Simplex –Transmitting and receiving on the same frequency –Each user takes turns to transmit –Is the preferred method if it works

A Little Vocabulary First Duplex –Transmitting on one frequency while simultaneously listening on a different frequency –Repeaters use duplex –Output frequency – the frequency the repeater transmits on and you listen to –Input frequency – the frequency the repeater listens to and you transmit on

Things to Know to Use a Repeater Output frequency Frequency split –and therefore the input frequency Repeater access tones (if any)

Repeater Output Frequency Repeaters are frequently identified by their output frequency –Meet you on the machine. Here the specific frequency is used –Lets go to 94. Here an abbreviation for a standard repeater channel is used meaning MHz –How about the NARL repeater? Here the repeater is referenced by the sponsoring club name

Repeater Frequency Split The split, shifts, or offset frequencies are standardized to help facilitate repeater use There are + and – shifts depending on the plan Different bands have different standardized amounts of shift

Repeater Access Tones Sometimes multiple repeaters can be accessed at the same time unintentionally To preclude unintentional access, some repeaters require a special sub-audible tone to be present before the repeater controller will recognize the signal as a valid signal and turn on the repeater These tones are called by various names (depending on equipment manufacturer) –CTCSS –PL –Privacy codes or tones

Repeater Access Tones Access tones are usually published along with repeater frequencies Could also be announced when the repeater identifies –PL is Tones are generally programmed into the radio along with frequency and offset

Repeater Controller Computer that controls the repeater operation –Station identification (Morse code or synthesized voice) Same ID requirements as you have –Time-out protection Sometimes called the alligator Protects against continuous transmission in the event of a stuck PPT or long winded hams –Courtesy tone – repeater time-out timer reset

Data Modes Connecting computers via ham radio –Some systems use radio to connect to Internet gateways The bulk of the work is done by specialized modems or computer software/sound card –Terminal Node Controller (TNC) –Multiple Protocol Controller (MPC)

TNC – MPC Provide digital interface between computer and radio –Package the data into proper format –Convert digital data into audio tones representing 1s and 0s of digital data –Send/receive tones to transceiver –Control the transceiver

Data Station Setup

Review Test Questions T5B08 T5C03, T5A08-10 T6A03

Next Time Antenna Systems Read 3-12 through 3-23