Amateur television

Signal circuit performance checks made when using a typical test card.

Test transmission signal for chrominance and luminance signals check using Pal D (delay line) encoding - colour

Amateur television (ATV) is the transmission of broadcast quality video and audio over the wide range of frequencies of radio waves allocated for radio amateur (Ham) use. ATV is used for non-commercial experimentation, pleasure and public service events. Ham TV stations were on the air in many cities before commercial television stations came on the air. Various transmission standards are used, these include the broadcast transmission standards of NTSC in North America and Japan, and PAL or SECAM elsewhere, utilizing the full refresh rates of those standards. ATV includes the study of building of such transmitters and receivers, and the study of radio propagation of signals travelling between transmitting and receiving stations.

单词	Amateur television
释义	Amateur television 英语百科 Amateur television Amateur television (ATV) is the transmission of broadcast quality video and audio over the wide range of frequencies of radio waves allocated for radio amateur (Ham) use. ATV is used for non-commercial experimentation, pleasure and public service events. Ham TV stations were on the air in many cities before commercial television stations came on the air. Various transmission standards are used, these include the broadcast transmission standards of NTSC in North America and Japan, and PAL or SECAM elsewhere, utilizing the full refresh rates of those standards. ATV includes the study of building of such transmitters and receivers, and the study of radio propagation of signals travelling between transmitting and receiving stations.
随便看	behind someone behind tape reader system behind test behind the arc behind the arras behind the bars Behind the bit Behind the counter Behind the Curtain behind the curve behind the ear aid behind the ear hearing aid behind the ear hearing aids Behind the Eight Ball behind the eightball Behind the Eyeball behind their back behind their time behind the lens BTL behind the lens shutter behind the lines Behind the Mask behind the requirement Behind the Scene behindthe scenes