Hi,
I used a Funcube Dongle and gnuradio. You do need the 40 (34)kHz bw. Google for OZ9AEC, Gnuradio, NOAA.
Alex has done it in gnuradio. I have also done it in gnuradio [to be honest most of it was "borrowed" from Alex]
See http://hal.g7iii.net/POES/FlowGraphs/POES_Live_Decode_Annotated.png
If you patch in a resampler (to 11.025kHz) between the FM Demod and Audio sink blocks, you can send that to an ALSA loopback sound device, and connect wxtoimg to the other end.
See (unannotated, and with extra debug, dual output so I could compare, and other features):
http://hal.g7iii.net/POES/FlowGraphs/POES_Live_WXtoIMG.grc.png
Plenty of received pictures at http://hal.g7iii.net/POES/
Iain
On 05/12/14 22:29, jkelly wrote:
I believe the bandwidth is less - but due to doppler they spec a 40khz bandpass so the 34khz signal can slide within the 40khz receiver.
This link might be helpful:
http://en.wikipedia.org/wiki/Automatic_Picture_Transmission
Jeff K2SDR
On 12/5/2014 4:34, Rupesh Lad wrote:
Hello all;
I am an undergraduate Engineering student and a SWL. I have tracked many Amateur satellites from COEP Ground station, VU2COE.
I want to Home brew a NOAA satellite image receiver as my academic project. I will be using WXtoImg to decode the image transmitted by NOAA satellite on APT frequency. So the task for me is to get the audio frequency output.
Literature says that NOAA satellites transmit a signal of 40 kHz bandwidth. I have also observed the spectrum on Spectrum analyzer using my antenna. Want to know whether this is only RF bandwidth? and if it is so, then what is IF bandwidth of such signals?
Can anyone help us in designing the receiver?
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