File:UHF_TV_Antenna_001.JPG
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Summary
DescriptionUHF TV Antenna 001.JPG |
English: Yagi antenna for UHF HDTV reception. The antenna's main lobe is off the right end of the antenna; it is most sensitive to stations in that direction. Each of the metal crossbars along the antenna support boom is called an element, which acts as a half-wave dipole resonator for the radio waves. The antenna has one driven element which is attached to the TV; it is behind the black box (left). The black box is a preamplifier which increases the power of the TV signal before it is sent to the TV set. The 17 elements to the right of the driven element are called directors; they reinforce the signal. The 4 elements on the V shaped boom (left) are called a "corner reflector"; they serve to reflect the signal back toward the driven element. Yagi HDTV antennas use a corner reflector to increase the bandwidth of the antenna. The rest of the antenna increases the gain at higher channels, while the corner reflector increases the gain at lower channels. |
Date | |
Source | Own work |
Author | Tennen-Gas |
Permission (Reusing this file) |
GFDL |
Licensing
Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1.2 or any later version published by the Free Software Foundation; with no Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts. A copy of the license is included in the section entitled GNU Free Documentation License.http://www.gnu.org/copyleft/fdl.htmlGFDLGNU Free Documentation Licensetruetrue |
This file is licensed under the Creative Commons Attribution-Share Alike 3.0 Unported license. | ||
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This licensing tag was added to this file as part of the GFDL licensing update.http://creativecommons.org/licenses/by-sa/3.0/CC BY-SA 3.0Creative Commons Attribution-Share Alike 3.0truetrue |
Items portrayed in this file
depicts
18 October 2008
0.0125 second
200 millimetre
320
image/jpeg
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Date/Time | Thumbnail | Dimensions | User | Comment | |
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current | 06:43, 6 November 2008 | 1,000 × 400 (164 KB) | 天然ガス | {{Information |Description={{en|1=Yagi UHF TV antenna}} |Source=Own work |Author=Tennen-Gas |Date=18 October 2008 |Permission=GFDL |other_versions= }} <!--{{ImageUpload|full}}--> Category:Television Antenna |
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Camera manufacturer | Canon |
---|---|
Camera model | Canon EOS 5D |
Exposure time | 1/80 sec (0.0125) |
F-number | f/4 |
ISO speed rating | 320 |
Date and time of data generation | 16:48, 18 October 2008 |
Lens focal length | 200 mm |
Orientation | Normal |
Horizontal resolution | 100 dpi |
Vertical resolution | 100 dpi |
Software used | Adobe Photoshop CS Windows |
File change date and time | 15:36, 6 November 2008 |
Y and C positioning | Centered |
Exposure Program | Manual |
Exif version | 2.21 |
Date and time of digitizing | 16:48, 18 October 2008 |
Shutter speed | 6.375 |
APEX aperture | 4 |
Exposure bias | 0 |
Flash | Flash did not fire, compulsory flash suppression |
Color space | sRGB |
Focal plane X resolution | 3,086.925795053 |
Focal plane Y resolution | 3,091.2951167728 |
Focal plane resolution unit | inches |
Custom image processing | Normal process |
Exposure mode | Manual exposure |
White balance | Auto white balance |
Scene capture type | Standard |
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