On Fri, 2013-10-25 at 18:13 +0300, Patrik Tast wrote: > Yeah, use a RTL-dongle and you could also use a $5 TV-inline amplifier > (or 2x if you have a long line). TV-inline amplifier:s are noisy but who > cares in your case, the GOES signal is strong at you location. You can > find one at ebay or here > http://www.sadoun.com/Sat/Order/Switches/inline_amplifier.htm > > > Patrik > > > > > On Fri, 2013-10-25 at 10:31 -0400, Raydel Abreu (CM2ESP) wrote: > > Hi Patrick, > > > > > > Thanks for the help. A full-disk is a nice start from scratch, and > > perhaps later going better. I have an RTL-SDR dongle with a R820T > > tuner, my idea is to eventually receive data with it, but it is a work > > in progress. The dish and the LNA should be ready by January. > > > > > > I live in Cuba, but I have a friend in Argentina who has a dish, a LNA > > and a RTLSDR dongle working right now. I will ask him for record a WAV > > file containing I/Q data from the dongle and then try here at my home > > for demodulate his signal. If we had success, that will be excellent. > > > > > > I have to wait until my ground station is complete, here in Cuba there > > are no specialized stores for that so all the equipment has to be > > homebrew. I am working on the dish and its feed and a friend in > > Croatia sent me a 1500 MHz LNA which I have to try to re-tune to 1700, > > when the postal package arrives next month... I have my fingers cross > > hoping to have all ready by January. > > > > > > So far I have only obtain APT imagery, but I guess APT will not be > > active too long, so GOES seems to be the best choice... > > > > > > Best regards, > > > > > > Raydel > > > > > > 2013/10/25 Patrik Tast <pat...@poes-weather.com> > > Hi Rydel, > > > > Right, you will first get CCSDS frames (bpsk-demodulated) let > > us call > > that file lrit-frames.dat. To create images from the frames > > (lrit-frames.dat) we need to unpack the data (lrit-frames.dat) > > using the > > RICE algorithm to a new file say goes-13-lrit-frames.lrit. > > Since the > > data rate is low we could rice-decode the frames (10 > > frames/earth disk) > > on the fly, of course. > > > > The (NASA) RICE algorithm seems to be fairly easy BUT I > > haven't bothered > > to try since the result (full-disk) ain't that valuable for > > weather. > > You'll get nice images of Tellus, that's 4 sure. > > > > The RICE lib from NOAA is found here > > http://www.noaasis.noaa.gov/LRIT/software.html It doesn't link > > (on > > linus), we've asked if they could release source-code so we > > could make > > it cross-platform (last year).... > > > > We will support you if you want to have a go. We have antennas > > standing > > by at LA (Los Alamitos) > > > > Patrik > > >
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