A photo-telegraph transmitter-receiver utilizing sub-carrier frequency modulation
作者:
R.O.Carter,
L.K.Wheeler,
期刊:
Proceedings of the IEE - Part III: Radio and Communication Engineering
(IET Available online 1952)
卷期:
Volume 99,
issue 62
页码: 335-343
年代: 1952
DOI:10.1049/pi-3.1952.0078
出版商: IEE
数据来源: IET
摘要:
The equipment described is designed for the transmission and reception of pictures by sub-carrier frequency modulation, the same mechanical and optical system being used for transmission and reception. All mechanical, optical and electrical parts and all testing equipment required for normal operation are contained within a single console. The mechanical system is of the normal drum type rotating at the standard speed of 1 r.p.s. The drum diameter is 3.52 in and is scanned at 100 lines per inch, giving the standard index of co-operation of 352. Speed control is from a crystal oscillator. Provision is made for alternative positive or negative photographic reception. The f.m. swing is adjustable both in magnitude and sign, the final standards adopted being 2300 c/s for black and 1500 c/s for white.
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