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reynico / raspberry-noaa

Fully automated ISS SSTV, NOAA and Meteor satellite image downloader using Raspberry PI
https://github.com/reynico/raspberry-noaa
GNU General Public License v3.0
181 stars 56 forks source link

Good images cropped to narrow band #16

Closed ant-thomas closed 4 years ago

ant-thomas commented 4 years ago

Not sure if this is a feature or an issue. Or I'm more so looking for a bit of info/advice. I've made a pretty janky indoor dipole antenna with some 1.5mm2 copper cable, also added an amplifier. Was previously using the amp for an ADS-B setup, just changed the antenna. Not tuned in any way, antenna length is about right.

image

Most passes result in some signal, but generally poor. Occasionally there's a pass which is very good, but the output image is cropped to what looks like the good section, rather than the full length of the pass/recording.

Is this supposed to happen to remove any noise across the "bad" area? Unsurprisingly the good area has my location near enough centered.

Eg.... image

Great to see the setup works, but would be interested to see the full pass on "good" receive.

ant-thomas commented 4 years ago

Interestingly just had a full pass with the good bit in the middle, along with the rest noisy.... Will eventually look at a better antenna, but would be good to know if there's a setting to be changed to prevent the crop?

image

reynico commented 4 years ago

Hi Thomas! Sure, append -A to the wxtoimg line

         -A         all (do not cut top and bottom low signal sections)

So it'll end up like

        /usr/local/bin/wxtoimg -A -o -m "${NOAA_HOME}/map/${3}-map.png" -e "$i" "${NOAA_AUDIO}/audio/${3}.wav" "${NOAA_OUTPUT}/image/${FOLDER_DATE}/${3}-$i.jpg"
ant-thomas commented 4 years ago

Fantastic, thank you!