File:Microwave tower in the Mojave National Preserve, California (28795031790).jpg
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Summary[edit]
DescriptionMicrowave tower in the Mojave National Preserve, California (28795031790).jpg |
English: A microwave relay tower on Granite Pass, Mojave National Preserve, California. This is part of the TD-2 AT&T Long Lines system, a microwave relay network created by AT&T in the 1950s to relay telephone calls and other data between cities in the USA. The four angular cone-shaped antennas are called horn-reflector antennas, invented by Albert Beck and Harald Friis in 1941 and developed by D. L. Hogg at Bell Labs in 1961. They operate at C-band frequencies. at 4 and 6 GHz. They consist of a vertical flaring metal horn, fed by a vertical waveguide from the shed at ground level, with a reflector mounted in the mouth of the horn at a 45° angle, so the beam of microwaves is emitted horizontally. The reflector is a segment of a parabolic reflector, so the antenna is equivalent to a parabolic antenna fed off-axis. The advantage of this type of antenna over an ordinary parabolic (dish) antenna is that it radiates very little energy outside of the main beam. This allows the same microwave frequencies to be used by several nearby antennas pointing in different directions without interfering with each other. These KD-15676 antennas have a gain of about 43 dBi and produce a beamwidth (HPBW) of about 1° at 6 GHz. Two antennas are used for each path, one receiving and one transmitting. Each beam carried thousands of telephone calls. (From KD-15676 Horn Reflector Antenna Description, Bell System standards, AT&T |
Date | |
Source | Microwave tower in the Mojave National Preserve, California |
Author | Tony Webster from Minneapolis, Minnesota |
Camera location | 34° 48′ 42.55″ N, 115° 36′ 34.08″ W | View this and other nearby images on: OpenStreetMap | 34.811819; -115.609467 |
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Licensing[edit]
This file is licensed under the Creative Commons Attribution-Share Alike 2.0 Generic license.
- You are free:
- to share – to copy, distribute and transmit the work
- to remix – to adapt the work
- Under the following conditions:
- attribution – You must give appropriate credit, provide a link to the license, and indicate if changes were made. You may do so in any reasonable manner, but not in any way that suggests the licensor endorses you or your use.
- share alike – If you remix, transform, or build upon the material, you must distribute your contributions under the same or compatible license as the original.
This image was originally posted to Flickr by Tony Webster at https://flickr.com/photos/87296837@N00/28795031790. It was reviewed on 6 January 2017 by FlickreviewR and was confirmed to be licensed under the terms of the cc-by-sa-2.0. |
6 January 2017
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Date/Time | Thumbnail | Dimensions | User | Comment | |
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current | 00:38, 6 January 2017 | 4,990 × 3,395 (7.72 MB) | Tony Webster (talk | contribs) | Transferred from Flickr via Flickr2Commons |
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Metadata
This file contains additional information such as Exif metadata which may have been added by the digital camera, scanner, or software program used to create or digitize it. If the file has been modified from its original state, some details such as the timestamp may not fully reflect those of the original file. The timestamp is only as accurate as the clock in the camera, and it may be completely wrong.
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Camera manufacturer | Canon |
Camera model | Canon EOS 5D Mark III |
Author | Tony Webster |
Exposure time | 1/500 sec (0.002) |
F-number | f/8 |
ISO speed rating | 100 |
Date and time of data generation | 18:14, 7 August 2016 |
Lens focal length | 82 mm |
Latitude | 34° 48′ 42.55″ N |
Longitude | 115° 36′ 34.08″ W |
Altitude | 1,189.451 meters above sea level |
Label | Purple |
Source | tonywebster.com |
Credit/Provider | Tony Webster |
Online copyright statement | tonywebster.com |
Short title |
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Copyright holder |
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Usage terms |
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Horizontal resolution | 1,200 dpi |
Vertical resolution | 1,200 dpi |
Software used | Adobe Photoshop Lightroom 6.5 (Macintosh) |
File change date and time | 22:51, 18 August 2016 |
Exposure Program | Aperture priority |
Exif version | 2.3 |
Date and time of digitizing | 20:14, 7 August 2016 |
APEX shutter speed | 8.965784 |
APEX aperture | 6 |
APEX exposure bias | 0 |
Maximum land aperture | 4 APEX (f/4) |
Metering mode | Pattern |
Flash | Flash did not fire, compulsory flash suppression |
DateTimeDigitized subseconds | 16 |
Color space | sRGB |
Focal plane X resolution | 1,600 |
Focal plane Y resolution | 1,600 |
Focal plane resolution unit | 3 |
Custom image processing | Normal process |
Exposure mode | Auto exposure |
White balance | Auto white balance |
Scene capture type | Standard |
GPS tag version | 0.0.2.2 |
Serial number of camera | 062024015252 |
Lens used | EF24-105mm f/4L IS USM |
Rating (out of 5) | 5 |
Date metadata was last modified | 15:51, 18 August 2016 |
Special instructions | summer2016-day11 |
Original transmission location code | Published August 19, 2016 |
Unique ID of original document | E099BCD31C047EE4680D4092F55B1F14 |
Copyright status | Copyrighted |
Keywords |
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Contact information | tony@tonywebster.com
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Province or state shown | California |
Country shown | United States |
Code for country shown | US |
IIM version | 4 |