Difference between revisions 165057361 and 165057362 on dewiki

<!-- Deleted image removed: [[Image:Noaa-18 APT Enhanced.jpg|thumb|right|A colorized APT satellite image, received from [[NOAA-18]].]] -->
The '''Automatic Picture Transmission''' (APT) system is an analog image transmission system developed for use on [[weather satellites]]. It was introduced in the 1960s and over four decades has provided image data to relatively low-cost user stations at locations in most countries of the world. A user station anywhere in the world can(contracted; show full)

=== Displaying the images ===
Years ago,{{when|date=January 2015}} to receive APT images, a specialized decoder was required in addition to the receiver to display or print images, much like HF [[WEFAX]] (serving the maritime community). Often both receiver and decoder were combined into one unit.

Today,{{when|date=January 2015}} with the advent of personal computers, all that is required is dedicated software{{which|date=January 2015}} (many of which offer "free" versions
 [http://www.geo-web.org.uk/soft.php]) and a sound card. The sound card acquires and digitizes the [[Slow-scan television|slow scan]] video (in the audible range) coming from the speaker, phones, or line-out of the receiver, and then the software will process the various visible and infrared channels of the AVHRR sensor. Most software will automatically save every image and publish processed image onto the website of choice, putting up a new image on every pass of an APT satellite.

==== Enhanced images ====
(contracted; show full)
* [http://www.digitalham.co.uk/quadrifilar-helix/ Home made Quadrifilar Helix for APT satellite reception] Tall slim design
* [http://www.digitalham.co.uk/qha-mk2/ Home made Quadrifilar Helix for APT satellite reception] More traditional design
* [http://www.digitalham.co.uk/r2zx-apt-satellite-receiver/ APT weather satellite receiver] One of several made for the amateur market
* [http://www.markroland.com/engineering/APT/APT_sample.mp3 APT sample]
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* [http://www.geo-web.org.uk/soft.php Decoding Software for APT Satellite Reception]

[[Category:Broadcast engineering]]
[[Category:Spacecraft instruments]]
[[Category:Satellite meteorology and remote sensing]]
[[Category:Satellite broadcasting]]