@@ -23,19 +23,9 @@ <h2>Receive and decode images from weather satellites</h2>
2323 </ header >
2424
2525 < p >
26- You can buy a
27- < a href ="https://osmocom.org/projects/rtl-sdr/wiki/Rtl-sdr "> RTL-SDR</ a >
28- for less than 30USD, it looks like a USB drive but it has a connector
29- for antennas. Using SDR software like < em > GQRX</ em > and < em > SDR#</ em >
30- you can receive FM signals, for example broadcast FM (around 100MHz) or
31- better, APT signals from NOAA satellites (around 137MHz).
32- </ p >
33-
34- < p >
35- < em > noaa-apt</ em > takes a recorded WAV file (from < em > GQRX</ em > ,
36- < em > SDR#</ em > , etc.) and decodes the image. As an example,
37- < a href ="{{ site.baseurl }}/examples/argentina.wav ">
38- this is a WAV file I recorded using GQRX</ a >
26+ < em > noaa-apt</ em > takes a recorded WAV file and decodes the image. As an
27+ example,
28+ < a href ="{{ site.baseurl }}/examples/argentina.wav "> this is a WAV file I recorded using GQRX</ a >
3929 using a RTL-SDR and a double cross antenna.
4030 When loading that file on < em > noaa-apt</ em > , you get as a result
4131 < a href ="{{ site.baseurl }}/examples/argentina.png "> this image</ a > .
@@ -44,7 +34,17 @@ <h2>Receive and decode images from weather satellites</h2>
4434 < h3 > Why?</ h3 >
4535
4636 < p >
47- NOAA satellite reception is fun, cheap and relatively easy. I made
37+ NOAA satellite reception is fun, cheap and relatively easy. You can buy
38+ a < a href ="https://osmocom.org/projects/rtl-sdr/wiki/Rtl-sdr "> RTL-SDR</ a >
39+ for less than 30USD, it looks like a USB drive but it has a connector
40+ for antennas. Using SDR software like < em > GQRX</ em > and < em > SDR#</ em >
41+ you can receive FM signals, for example broadcast FM (around 100MHz) or
42+ better, receive APT signals from NOAA satellites (around 137MHz) and
43+ then decode them with < em > noaa-apt</ em > .
44+ </ p >
45+
46+ < p >
47+ I made
4848 < em > noaa-apt</ em > because < em > WXtoIMG</ em > , the most popular decoding
4949 software, it's propietary and
5050 < a href ="https://www.rtl-sdr.com/notice-wxtoimg-website-down/ "> no longer maintained</ a > ,
@@ -56,6 +56,14 @@ <h3>Why?</h3>
5656 are not that obvious.
5757 </ p >
5858
59+ < p >
60+ < em > WXtoIMG</ em > requires WAV files with a sample rate of 11025Hz, also
61+ needs correct file modification timestamps for post processing. For
62+ convenience, you can use < em > noaa-apt</ em > for resampling your files to
63+ any sample rate preserving the timestamps. < em > noaa-apt</ em > also
64+ includes a tool that allows to set arbitrary timestamps on your files
65+ </ p >
66+
5967 < p >
6068 There are lots of really good
6169 < a href ="{{ site.baseurl }}/alternatives.html "> Alternatives</ a > , but all
@@ -68,22 +76,35 @@ <h3>Why?</h3>
6876 < h3 > Disadvantages</ h3 >
6977
7078 < p >
71- WXtoIMG has lots of features you might want that noaa-apt does not have,
72- for example false-color images, live decoding or map overlay. Anyways,
73- the quality of the black and white image should be the same.
79+ < em > WXtoIMG</ em > has lots of features you might want that
80+ < em > noaa-apt</ em > does not have, for example false-color images, live
81+ decoding or map overlay. Anyways, the quality of the black and white
82+ image should be the same.
7483 </ p >
7584
7685 < p >
77- If you get some kind of error or bad result don't hesitate to open a
78- Issue or to send me an email. Also I'm not a native english speaker so
79- please correct me . Both the code and the website is on the
86+ If you get some kind of error or bad result open a Issue or send me an
87+ email. Also I'm not a native english speaker so please let me know where
88+ I made mistakes . Both the code and the website is on the
8089 < a href ="https://github.com/martinber/noaa-apt "> GitHub repository</ a > .
8190 </ p >
8291
8392 < h3 > Screenshot</ h3 >
8493
8594 < img src ="images/gui.png " alt ="GUI "/>
8695
96+ < h3 > Features</ h3 >
97+
98+ < ul >
99+ < li > Decode raw images from WAV files.</ li >
100+ < li > Really easy to use GUI.</ li >
101+ < li > You can disable syncing and export every step of the decoding
102+ process, useful for corrupted recordings.</ li >
103+ < li > Telemetry band reading.</ li >
104+ < li > Resample WAV files preserving modification timestamps.</ li >
105+ < li > Modify timestamps of files.</ li >
106+ < li > Edit filter parameters from a configuration file.</ li >
107+ </ ul >
87108
88109 <!-- Content -->
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