The present disclosure is directed to a rooftop-mounted off-air television antenna system, device and method including an integrated signal meter. The antenna portion of the device is mounted to the roof of a vehicle. An antenna adjustment mechanism is located inside of the vehicle cabin. The ...
A wall plate assembly having a television channel select switch, a channel display, and a signal strength display. A circuit board on the rear of the wall plate includes a television antenna connector, a television output connector, and control electronics. The control electronics displays the sele...
It consists of a mixer circuit, a local oscillator, and (usually) an RF amplifier circuit. The front end is fed with the RF transmission line from the antenna. Either 300-ohm twin-lead or 75-ohm coaxial cable may be used. The latter case, 75-ohm coaxial cable, predominates today, but...
(c) an NTSC frequency up converter and power amplifier producing NTSC RF modulated analog video signals (NTSC RF signals), (d) an NTSC broadcast antenna and (e) an all band VHF and UHF signal transmission line having an input end and an output end; the HDTV system including: (1) a ...
Antenna receiver of signal television network,站酷海洛,一站式正版视觉内容平台,站酷旗下品牌.授权内容包含正版商业图片、艺术插画、矢量、视频、音乐素材、字体等,已先后为阿里巴巴、京东、亚马逊、小米、联想、奥美、盛世长城、百度、360、招商银行、工商银行等数万家
Cable television, originally known as Community Antenna Television or CATV, was introduced in the 1940s in areas that could not receive the TV signal without obstruction. The solution was to place an antenna on top of a large utility pole and locally share the signal. CATV, as we now know...
signal into high frequency. The output of the high frequency mixer 50 is connected to the input of a h.f. output amplifier 70, whose output is connected to the rebroadcasting antenna 80. For the gain control of the intermediate frequency amplifier 40, the rebroadcasting transmitter comprises ...
The receiving apparatus comprising: a substrate having thereon an amplifier amplifying a high frequency input signal 30, amplified by tuning only the high ... 细井雅敬 被引量: 1发表: 2005年 Single package television tuning apparatus, and television receiver A single package television tuning device...
through a parabolic antenna and a low-noise amplifier LNA and converted in a mixer 12 to an IF of 70MHz by a local oscillator signal from a local oscillator 24, and the converted signal is amplified by an amplifier 14, passed through a limiter 16, and sent to a frequency discriminator ...
This invention relates to antenna or signal collecting systems, and more particularly to directive antenna systems for the reception of signals of high frequencies of the order for example of those pr