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2. Traffic message channel - Wikipedia

   en.wikipedia.org/wiki/Traffic_message_channel

   Traffic message channel (TMC) is a technology for delivering traffic and travel information to motor vehicle drivers via FM radio or satellite radio. It uses digitally coded messages with event codes, location codes, and phrases in the user's language.

3. Radio scanner - Wikipedia

   en.wikipedia.org/wiki/Radio_scanner

   A radio scanner is a device that can tune to different frequencies and monitor various types of radio communications. Learn about the origins, functions, types and legality of scanners in different countries.

4. Rolling code - Wikipedia

   en.wikipedia.org/wiki/Rolling_code

   Rolling code is a technique to prevent replay attack on keyless entry systems, such as garage door openers and car locks. It uses a pseudorandom number generator to change the code for each transmission, and requires both transmitter and receiver to compare the codes.

5. Alpine Electronics - Wikipedia

   en.wikipedia.org/wiki/Alpine_Electronics

   Alpine Electronics is a Japanese subsidiary of Alps Electric that specializes in car audio and navigation systems. It has a history of innovation and quality, and produces products for various car brands and models.

6. Crystal radio - Wikipedia

   en.wikipedia.org/wiki/Crystal_radio

   Learn about the crystal radio, a simple and early type of radio receiver that uses a crystal detector to demodulate radio signals. Find out how crystal sets were invented, used, and made obsolete by vacuum tubes and other technologies.

7. Vehicle audio - Wikipedia

   en.wikipedia.org/wiki/Vehicle_audio

   Mobile players for physical media have been provided for vinyl records, 8-track tapes, cassette tapes, compact discs, and MP3s.The increased sophistication of the vehicle audio system to accommodate such media has made the audio unit a common target of car break-ins, so these are equipped with anti-theft systems too.

8. R-S-T system - Wikipedia

   en.wikipedia.org/wiki/R-S-T_system

   R-S-T system is a code for assessing the quality of a radio signal received by amateur radio operators and other radio hobbyists. It consists of three digits for readability, strength, and tone, with optional suffixes for special conditions.

9. Software-defined radio - Wikipedia

   en.wikipedia.org/wiki/Software-defined_radio

   Software-defined radio (SDR) is a radio communication system where software replaces hardware components such as mixers, filters, and modulators. SDR can change radio protocols dynamically and adapt to different spectrum usage.