Size of this preview: 800 × 536 pixels. Other resolutions: 320 × 214 pixels | 640 × 428 pixels | 968 × 648 pixels.
Original file (968 × 648 pixels, file size: 101 KB, MIME type: image/jpeg)
 | This is a file from the Wikimedia Commons. Information from its description page there is shown below. Commons is a freely licensed media file repository. You can help. |
Summary
| Description |
The magnetron and other microwave components of an early X band commercial airport radar transmitter, the De Mornay-Budd No. 412 RF unit, from an advert in a 1947 electronics magazine. It consists of a 9.375 GHz 20 kW peak power cavity magnetron tube (right) mounted between the poles of two alnico horseshoe magnets, its output feeding into a waveguide with a TR (transmit/receive) switch, connected to the receiver portion of the radar (upper waveguide). The waveguide aperture (left) is connected to the waveguide going to the dish antenna feed horn. In operation, the magnetron emits brief pulses of microwaves. During each pulse the 1B35 ATR and 1B24 TR tubes making up the TR switch is set to "transmit" to protect the sensitive receiver from the powerful output. Each pulse passes through the TR switch and waveguide to the antenna. Then the TR switch is set to "receive". The weak return pulse of microwaves reflected by the aircraft is received by the antenna and passes back down the waveguide to the TR switch, which routes it to the superheterodyne receiving components in the upper waveguide section. Here a 2K25 reflex klystron tube generates a W:local oscillator signal. This is mixed with the return signal in a 1N21 point-contact germanium diode mixer. The intermediate frequency (IF) is filtered from the output of the diode by a vacuum tube IF amplifier section and creates the display on the radar screen (not shown). The capped coaxial connecter (lower left) is a directional coupler which allows the output to be conveniently sampled. |
| Date | |
| Source | Retrieved June 18, 2014 from Tele-Tech magazine, Caldwell-Clements Inc., New York, Vol. 6, No. 1, January 1947, p. 99 on http://www.americanradiohistory.com |
| Author | Unknown author |
| Permission (Reusing this file) |
This image is from an advertisement without a copyright notice published in a 1947 US magazine. In the United States, advertisements published in collective works (magazines and newspapers) are not covered by the copyright notice for the entire collective work. (See U.S. Copyright Office Circular 3, "Copyright Notice", page 3, "Contributions to Collective Works".) Since the advertisement was published before 1978 without a copyright notice, it falls into the public domain. |
Licensing
|
This work is in the public domain in the United States because it was published in the United States between 1929 and 1977, inclusive, without a copyright notice. For further explanation, see Commons:Hirtle chart as well as a detailed definition of "publication" for public art. Note that it may still be copyrighted in jurisdictions that do not apply the rule of the shorter term for US works (depending on the date of the author's death), such as Canada (50 p.m.a.), Mainland China (50 p.m.a., not Hong Kong or Macao), Germany (70 p.m.a.), Mexico (100 p.m.a.), Switzerland (70 p.m.a.), and other countries with individual treaties.
|
 |
File history
Click on a date/time to view the file as it appeared at that time.
| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 00:01, 3 November 2015 | | 968 × 648 (101 KB) | Chetvorno | User created page with UploadWizard |
File usage
The following pages on the English Wikipedia use this file (pages on other projects are not listed):
Global file usage
The following other wikis use this file:
- Usage on fa.wikipedia.org
