Broadcast History – Rapid-Review Notes

Early Long-Distance Communication

• Ancient Greeks used hilltops, night fires, smoke columns, mirrors for signalling.
• Little advancement until $19^{\text{th}}$-century electric telegraph (clicks on wires) → foundation for later wireless broadcast.

Beginnings of Radio

• Radio = first modern mass medium; enabled wireless, equipment-based reception by anyone.
• First documented radio transmission: $1895$ by Guglielmo Marconi (sent Morse $\cdot\cdot\cdot$ "S" over $3$ miles).
• Marconi patented systems, built south-coast UK stations; received first trans-Atlantic signal ($12$ Dec $1901$).
• $1920\text{s}$ radio boom parallels today’s internet: hobbyist "broadcast slots," mass communication.

Key Radio Roles

• World War $2$: radio vital for news, government instructions, political speeches, morale-boosting entertainment.

Beginnings of Television

• Concept circulated since $1870\text{s}$; practical progress in $1920\text{s}$.
• Key inventors:
  • Vladimir K. Zworykin ($1921$) – converted light patterns to electronic impulses.
  • John Logie Baird ($1924$) – first set (shadow images).
  • Philo Farnsworth ($1924$) – concept of broadcast TV.
• First public TV demo: crude camera & receiver at $1928$ World’s Fair.
• Major broadcasters founded $1927$: BBC (UK), CBS (US).

Television Growth & Technology

• WW$2$ halted TV outside US; rapid post-$1945$ revival (BBC resumed same program paused in $1939$).
• TV ownership climbed yearly from $1940\text{s}$; now ≈ $1$ billion sets worldwide.
• Colour TV introduced early $1950\text{s}$ (backwards-compatible with B&W).
• Modern HDTV features: movie/sport modes, stereo, console/computer input, emerging $3$D & wireless home-theatre.

Broadcasting Process & Economics

• TV broadcasting is technology-intensive → historically run by governments/large corporations.
• High costs offset by advertising revenue: fastest way for advertisers to reach consumers.
• Production chain spans: on-screen talent → technicians → ad-sales teams.

Key Takeaways

• "Broadcast" = making information widely available via one-to-many transmission.
• Telegraph wired clicks → radio wireless signals → television moving images: each stage broadened reach and immediacy.
• Technological innovation and commercial interest drive continuous evolution of broadcast media.