RF stuff

RF Propagation informations page

Received by F-21828 from JN23qh (FR Marseille)

• HF
  • Reception map on pskreporter.info
  • ham SSB/CW
    • Reception Callsign logs
    • All band & mode grid map
    • Frequencies/Country statistics
  • Wefax
  • CHU Canadian time signal (On map)
    • Audio file (2021-11-01T00:20Z)
  • Gander airport VOLMET
    • Audio file (2021-11-01T01:00Z)
  • RTTY
    • 7646Khz 2021-11-01T17:11Z to 2021-11-01T19:38Z logs
• VHF
  • NOAA-18 Satelite 2021-03-06 APT image (all)

Hardware

• RTL2832U RTL-SDR dongle
• Antennas
  • MLA-30+ 500Khz-30Mhz active loop antenna
  • Dipole telescopic antennas 23 to 100cm
  • Dipole telescopic antennas 5 to 13cm
• Nooelec Ham It Up Plus 300Hz-65Mhz 125Mhz Upconverter
• Computers
  • PC x86_64 (AMD X4 880K)
  • Raspberry PI4 b

Photos

Raspbery PI4 b + Ham It Up + RTL-SDR dongle + MLA30+ bias-t

MLA30+

Software

rtl-sdr

softwares & lib

gqrx

SDR software using QT graphical toolkit and powered by GNU Radio

gqrx-scanner

Frequency scanner for gqrx

fldigi

using soundcard as data modem

multimon-ng

Decoding digital transmissions

noaa-apt

Decoding NOAA satelites APT images

dump1090

ADS-B Mode S decoding software for rtl-sdr devices

gnuais

Demodulate & decode AIS messages

rtl_433

Decode radio transmission from devices on the ISM bands

radiosonde_auto_rx

Set of utilities to allow automatic reception and uploading or radiosondes positions

dsd

Digital speech decoder

WSJT-X

Decode FST4, FST4W, FT4, FT8, JT4, JT9, JT65, Q65, MSK144, and WSPR

cqrlog

Advanced ham radio logger

GNU/Linux Debian and Raspbian

Computer's operating systems

Softwares reminders

With gqrx configured to send raw audio to udp://localhost:7355

qgrx - multimon-ng

CW Morse decoding

	nc -l -u 7355 | sox -t raw -esigned-integer -b16 -r 48000 - -esigned-integer -b16 -r 22050 -t raw -  | ./multimon-ng -a SCOPE -a MORSE_CW -f alpha -
	

POCSAG decoding

	nc -l -u 7355 | sox -t raw -esigned-integer -b16 -r 48000 - -esigned-integer -b16 -r 22050 -t raw -  | ./multimon-ng -a SCOPE -a POCSAG512 -f alpha -
	

gqrx - icecast2

	nc -l -u 7355  | oggenc --managed -q 5 -m 64 -M 256 -r --ignorelength -C 1 -R 48000 -r - | oggfwd -d gqrx -n test $ICECAST_HOST $ICECAST_PORT $SOURCE_PASSWORD /gqrx.ogg
	

gqrx - aplay

	nc -l -u 7355 | aplay -r 48k -f S16_LE -t raw -c 1
	

gqrx - local lossless TCP stream

	# On server
	while [ 1 ]; do nc -l -u 1235 | pv | flac -0 --force-raw-format --channels=1 --sample-rate 48000 --bps=16 --endian=little --sign=signed -c - | nc -l 1234 ; done
	# On client
	nc server.tld | pv | mplayer -msglevel all=2 -
	

Rsync last fldigi decoded wefax (See here)

cd ~/.fldigi/images; while [ 1 ]; do for im in *_ok.png; do echo $im | grep "thumb" >/dev/null && continue; if [ ! -f "thumb_$im" ]; then optipng $im; convert $im -resize 15% thumb_$im; optipng thumb_$im; echo $im; fi;  done; rsync -av ./*_ok.png root@SERVER:PATH ; date; sleep 60; done