AM-radio
AM-radio er radiofoni, som anvender amplitudemodulation (AM).
AM-radio beregnet til offentligheden, anvendes især i frekvensbåndet 153 kHz til 30 MHz og omfatter båndene:
- Langbølgebåndet (153 til 281 kHz)
- Mellembølgebåndet (535 kHz til 1705 kHz)
- Kortbølgebåndet (1705 kHz til 30 MHz)
AM Signalling System (AMSS)
Ved NAB2006 er der blevet præsenteret et åbent am-radiokanals signaleringssystem kaldet AMSS (AM Signalling System). Formålet med denne kanal er at bibringe radioforsatsen med alternative AM-frekvenser og evt. DRM-frekvenser, så radioforsatsen har mulighed for automatisk at skifte til eller oplyse om den bedste kanal.
Se også
- Modulation
- Amplitudemodulation
- AM-detektor
- Radiomodtager
- Krystalradio
- Retmodtager
- Superheterodynmodtager
- FM-radio
Kilder/referencer
- ^ "dr-boesch.ch: Sangean Testbericht ATS 909". Arkiveret fra originalen 7. juli 2012. Hentet 7. juli 2012.
- ^ Transistor radio mini-history Citat: "...CD [civil defense] marks. These were in the shape of little triangular marks which should appear in all the transistor radios made up to 1963. These marks were meant to show the frequencies for the emergency tuning of the radios in case of nuclear attack from the USSR..."
Medier brugt på denne side
Forfatter/Opretter: Gregory F. Maxwell <gmaxwell@gmail.com> PGP:0xB0413BFA, Licens: GFDL 1.2
Regency TR-1 transistor radio, the first commercial transistor radio, which debuted October 18, 1954. Designed by Texas Instruments and IDEA, the TR-1 had a superheterodyne circuit with only 4 transistors: a combined local oscillator/mixer, two IF amplifiers, and one audio amplifier. Within one year of release, TR-1 sales approached 100,000. The transistor radio was the most popular communications device in history, with billions manufactured during the 1960s and 1970s. Courtesy of Steve Kushman.
Forfatter/Opretter: Oona Räisänen (w:User:Mysid), Licens: CC BY-SA 3.0
A "world band" or shortwave receiver (Sangean ATS-909). Currently receiving 3699 kHz USB (labeled Ysiysi, the Finnish name for this amateur frequency).