File:TRF Dials.jpg
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Summary[edit]
DescriptionTRF Dials.jpg |
English: Typical dial layout of a tuned radio frequency (TRF) receiver from the 1920s. A TRF receiver had several tuned radio frequency amplifier stages before the detector, each consisting of a vacuum tube amplifier and a tuned circuit with a variable capacitor. The multiple tuned circuits each had to be tuned to the frequency of the desired station before the radio would work. Later TRF receivers had the capacitors mounted on a common shaft so they could be tuned together with a single knob, but early receivers like this one had separate tuning knobs for each capacitor. |
Source | Own work |
Author | Sweidman |
Licensing[edit]
Public domainPublic domainfalsefalse |
I, the copyright holder of this work, release this work into the public domain. This applies worldwide. In some countries this may not be legally possible; if so: I grant anyone the right to use this work for any purpose, without any conditions, unless such conditions are required by law. |
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Date/Time | Thumbnail | Dimensions | User | Comment | |
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current | 19:44, 15 April 2009 | 1,792 × 1,200 (612 KB) | Sweidman (talk | contribs) | Closeup of Tuned Radio Frequency Receiver Dials | |
19:41, 15 April 2009 | 1,024 × 587 (175 KB) | Sweidman (talk | contribs) | {{Information |Description={{en|1=Typical Dial Layout of Tuned Radio Frequency Receiver}} |Source=Own work by uploader |Author=Sweidman |Date= |Permission= |other_versions= }} <!--{{ImageUpload|full}}--> |
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Camera manufacturer | Eastman Kodak Company |
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Camera model | KODAK DC290 Zoom Digital Camera (V01.00) |
Exposure time | 879/12,500 sec (0.07032) |
F-number | f/3.03 |
Date and time of data generation | 13:38, 1 December 2006 |
Lens focal length | 13.8 mm |
Orientation | Normal |
Horizontal resolution | 72 dpi |
Vertical resolution | 72 dpi |
Software used | ACD Systems Digital Imaging |
File change date and time | 13:27, 1 December 2006 |
Y and C positioning | Centered |
Exif version | 2.2 |
Image compression mode | 2.4 |
APEX shutter speed | 4 |
APEX aperture | 3 |
APEX exposure bias | 0 |
Maximum land aperture | 4 APEX (f/4) |
Subject distance | 0.72 meters |
Metering mode | Center weighted average |
Light source | Unknown |
Flash | Flash fired |
DateTime subseconds | 283 |
Color space | sRGB |
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