A few months ago I started looking at various options for omnidirectional antennas with circular polarization for satellite communications. I came across the TA-1 137 MHz turnstile antenna from Wimo, which looked like an interesting option for a reasonable price.
Continue reading “On-air tests of the Wimo TA-1 turnstile antenna”
Two months ago I hooked up my VHF satellite receiver to the SatNOGS network. Since then, the receiver has been receiving many different satellites, including APT images from NOAA 15, 18 and 19.
Continue reading “Daily NOAA weather satellite images”
Tonight I tested the turnstile antenna and Airspy on the Meteor-M N2 LRPT downlink signal. It was a good, high elevation pass and it looks like the signal is strong enough to decode the transmitted images.
Continue reading “Meteor-M N2 LRPT downlink”
Some time ago I got a 137 MHz turnstile antenna from Jørn OZ6TA. We decided to build an automated NOAA weather satellite image receiver using a modern SDR device. He also had an Airspy he wasn’t using and so it became the SDR radio we were going to use for this.
Continue reading “My first weather satellite images with a 137 MHz turnstile antenna”
I have wanted to implement a simple APT decoder for the NOAA weather satellites in GNU Radio for quite some time now, in particular since the USRP equipped with a TVRX or WBX daughterboard and a GNU Radio FM receiver can be an extremely good receiver for this purpose. Today I have spent some time looking at the details of decoding APT and actually ended up with a working prototype implemented using the GNU Radio Companion.
Continue reading “Simple APT decoder prototype”
A few APT images received from NOAA 18 and NOAA 19 yesterday. THe setup I used was the very same that I have described earlier. Click on images to see full resolution and image details.
Continue reading “NOAA 18 and 19 APT images Sunday, 17 Oct 2010”
Last weekend I wrote about my spontaneous experiments with receiving and decoding APT transmissions from NOAA polar orbiting weather satellites. This weekend I decided to extend the experiments by trying to receive at very low elevations and get images from far away.
Continue reading “More NOAA APT Images with GNU Radio, URSP and WBX”
This weekend I ended up receiving APT signals from NOAA polar orbiting weather satellites. I only wanted to explore IQ data recording and playback with GNU Radio but when I first used NOAA 15 as test signal and saw what I could receive I got slightly distracted from my original plan.
Continue reading “NOAA Weather Satellite Reception with GNU Radio and USRP”