File:GP-70cm.jpg
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Size of this preview: 428 × 599 pixels. Other resolutions: 171 × 240 pixels | 343 × 480 pixels | 983 × 1,376 pixels.
Original file (983 × 1,376 pixels, file size: 560 KB, MIME type: image/jpeg)
File information
Structured data
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Summary
[edit]DescriptionGP-70cm.jpg |
Deutsch: Selbstgebaute Groundplane-Antenne für das 70cm-Band
English: UHF ground plane antenna for the 70 cm (420 MHz) band. This is a quarter-wave whip (monopole) antenna (rod at top) with four grounded quarter-wave conductors projecting down from the base of the whip to form a "ground plane". Ground plane antennas have an omnidirectional radiation pattern, radiating equal signal strength in all azimuthal directions, with the radiated power maximum in a horizontal direction and decreasing with elevation angle to zero on the antenna axis. The ground conductors serve to increase radiated power in the horizontal direction to twice the gain of a dipole, or 5.19 dB. If the ground plane wires extended out horizontally from the base of the monopole the impedance would be half that of the dipole, or 36.5 ohms. However the downward slant of the ground plane wires serves to increase the antenna impedance, so the antenna is a good match for the 50 ohm coaxial cable feedline. |
Date | |
Source |
Self-photographed (Original caption: " selbst fotografiert ") |
Author | D.Derigs at German Wikipedia |
Licensing
[edit]Public domainPublic domainfalsefalse |
This work has been released into the public domain by its author, D.Derigs at German Wikipedia. This applies worldwide. In some countries this may not be legally possible; if so: D.Derigs grants anyone the right to use this work for any purpose, without any conditions, unless such conditions are required by law.Public domainPublic domainfalsefalse |
Original upload log
[edit]Transferred from de.wikipedia to Commons by Wdwd using CommonsHelper.
The original description page was here. All following user names refer to de.wikipedia.
- 2008-09-06 21:14 D.Derigs 983×1376× (573698 bytes) {{Information |Beschreibung = Selbstgebaute Groundplane-Antenne für das 70cm-Band |Quelle = selbst fotografiert |Urheber = ~~~ |Datum = 06. September 2008 |Genehmigung = |Andere Versionen = |Anmerkungen = }}
File history
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Date/Time | Thumbnail | Dimensions | User | Comment | |
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current | 00:37, 31 December 2011 | 983 × 1,376 (560 KB) | File Upload Bot (Magnus Manske) (talk | contribs) | {{BotMoveToCommons|de.wikipedia|year={{subst:CURRENTYEAR}}|month={{subst:CURRENTMONTHNAME}}|day={{subst:CURRENTDAY}}}} {{Information |Description={{de|Selbstgebaute Groundplane-Antenne für das 70cm-Band}} |Source=Transferred from [http://de.wikipedia.or |
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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.
Camera manufacturer | FUJIFILM |
---|---|
Camera model | FinePix S5700 S700 |
Exposure time | 1/220 sec (0.0045454545454545) |
F-number | f/3.5 |
ISO speed rating | 200 |
Date and time of data generation | 12:47, 5 September 2008 |
Lens focal length | 6.3 mm |
Author | Picasa 2.7 |
Orientation | 0 |
Horizontal resolution | 72 dpi |
Vertical resolution | 72 dpi |
Software used | Picasa 3.0 |
File change date and time | 12:47, 5 September 2008 |
Y and C positioning | Co-sited |
Exposure Program | Normal program |
Exif version | 2.2 |
Date and time of digitizing | 12:47, 5 September 2008 |
Meaning of each component |
|
Image compression mode | 4 |
APEX shutter speed | 7.8 |
APEX aperture | 3.6 |
APEX brightness | 5.4 |
APEX exposure bias | 0 |
Maximum land aperture | 3.6 APEX (f/3.48) |
Metering mode | Pattern |
Light source | Unknown |
Flash | Flash did not fire, auto mode |
Supported Flashpix version | 1 |
Color space | Uncalibrated |
Focal plane X resolution | 5,376 |
Focal plane Y resolution | 5,376 |
Focal plane resolution unit | 3 |
Sensing method | One-chip color area sensor |
File source | Digital still camera |
Scene type | A directly photographed image |
Custom image processing | Normal process |
Exposure mode | Auto exposure |
White balance | Auto white balance |
Scene capture type | Standard |
Sharpness | Normal |
Subject distance range | Unknown |
Unique image ID | 99ff6f90123cc6f2b692e4ab6113b1e3 |
Structured data
Items portrayed in this file
depicts
6 September 2008
200
0.0045454545454545 second
3.5
6.3 millimetre
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