Welcome To APTDecoder Software.
APTDecoder is a free software for recording and decoding signals transmitted by NOAA POES APT enabled weather satellites.
APT data are transmitted continuously as an analogue signal using amplitude modulation of a 2400 Hz carrier. A new line of data is transmitted each half second containing a line of image data from two AVHRR channels together with supporting information. As each image frame is received, synchronisation patterns show up as vertical black lines to the left of each image while telemetry data are shown as grey scale wedges carrying calibration and other information. Any two of the Advanced Very High Resolution Radiometer (AVHRR) channels can be chosen by the NOAA ground station for dissemination. A visible channel is used to provide visible APT imagery during daylight, and one IR channel is used constantly (day and night). A second IR channel can be scheduled to replace the visible channel during the night-time portion of the orbit. To receive APT you need a PC, 137 MHz receiver and a dedicated right hand polarized (RHCP) antenna.
APTDecoder can create four grayscale- and colour enhanced images. Coloured images are created based on an colour lookup table (CLUT). A CLUT editor is also included. It renders the raw image (fully decoded) while recording signals transmmitted from the satellite or while processing an audio file.
It can track multiple satellites, displays satellites on a map, predict passes and footprint overlaps on a given date. Orbital elements can be downloaded and updated from a user specified url or local file.
APTDecoder has radio control support for R2FX, RIG-RX2, EMGO and ICOM PCR1000/1500/2500.
It has an advance HTML/RSS 2.0 logging system. It automatically maintains the log after the pass is recorded and uploads it to the user specified server.

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