Receiving satellites

There are several weather satellites which are in a polar orbit. That means they are going from pole to pole and the earth is moving below them and this way they can visit the complete surface of the earth within a few days. And the best thing is they are sending unencrypted data back to earth in form of pictures from the surface.

The NOAA satellites are the most famous ones, but there are others like MetOp and FengYun. The NOAA satellites are using the APT (Automatic Picture Transmission) in the 2m band and HRPT (High Resolution Picture Transmission) at 1,7GHz. The MetOP and FengYun satellites use only HRPT at 1.7GHz. Check out the Frequencies page for a comprehensive list of the used frequencies.

To receive the data send by the satellites you need only a RTL-SDR stick and a helix antenna. The HRPT can be a bit difficult as 1.7GHz is near the upper limit of the RTL-SDR stick, but it should work. The helix antenna is easy to build.

Link list:

https://medium.com/swlh/decoding-noaa-satellite-images-using-50-lines-of-code-3c5d1d0a08da

https://www.rtl-sdr.com/gr-hrpt-gnu-radio-hrpt-decoder-blocks-for-noaa-meteor-metop-and-fengyun-3-weather-satellites/

https://www.rtl-sdr.com/improving-hrpt-reception-free-hrpt-decoder/

https://www.rtl-sdr.com/receiving-noaa-19-hrpt-with-a-hackrf-lna4all-and-cooking-pot-antenna/

https://github.com/altillimity/HRPT-Decoder

http://jcoppens.com/ant/qfh/calc.de.php – Rechner für QFH Antennen

https://en.wikipedia.org/wiki/High-resolution_picture_transmission

https://en.wikipedia.org/wiki/Low-rate_picture_transmission

https://www.eumetsat.int/media/43321 – HRPT specification

POCSAG

POCSAG is the protocol used for the pager networks.

There are several commercial providers and with DAPNET exists a network for ham radio.

DAPNET https://hampager.de/

The used frequency for DAPNET in Germany is 439.9875 MHz (https://hampager.de/dokuwiki/doku.php?id=dapnetfrq).

Easiest way to use DAPNET is to host a transmitter with a MMDVM HotSpot Board (https://github.com/juribeparada/MMDVM_HS) with PI-Star (http://www.pistar.uk/) on a Raspberry Pi Zero.

If no pager hardware is available a rtl sdr can be used.

Use GQRX as the receiver and forward the POCSAG signal to multimon-ng: nc -l -u -p 7355 | sox -t raw -esigned-integer -b 16 -r 48000 - -esigned-integer -b 16 -r 22050 -t raw - | multimon-ng -t raw -a POCSAG512 -a POCSAG1200 -a POCSAG2400 -f alpha -

This a version which should work without GQRX but is not tested and frequency has to be adjusted to Germany (https://lokcon.me/2019/06/18/rtl-sdr-pocsag) rtl_fm -M fm -f 439.9875M -s 22050 -g 100 -l 310 | multimon-ng -t raw -a POCSAG512 -a POCSAG1200 -a POCSAG2400 /dev/stdin

For test purposes you can send a POCSAG message locally from the pi-star system: sudo RemoteCommand page ” (https://forum.pistar.uk/viewtopic.php?t=746)

https://en.wikipedia.org/wiki/POCSAG

https://de.wikipedia.org/wiki/Radio-paging_code_No._1

https://www.qsl.net/db0avh/code.html - Nachrichtenaufbau von POCSAG

http://www.sxlist.com/techref/pager/pocsag.html - Nachrichtenaufbau von POCSAG

Frequencies

144.8 MHz APRS Frequenz in Europa 432.5 MHz APRS Frequenz in Europa

439.9875 MHz DAPNET (POCSAG) Frequenz

Relais

Relais Stuttgart 70cm 438.56250 (DB0LBG) at Katharinenlinde, Sightseeing Tower, DE. – https://www.repeaterbook.com/row_repeaters/details.php?state_id=DE&ID=9634

Relais Hannover 70cm DB0FUS 439,200 MHz – https://z08.vfdb.org/relaisstellen/db0fus/

Relais Hannover 70cm DB0TVH 439.2375 MHz – Bredero-Hochhaus – http://www.db0tvh.de/

438,337,5 MHz DMR+-Relais DB0LBG am Kathrinen-Linden-Turm

WSPR frequencies

http://wsprnet.org/drupal/node/218

Satelitte frequencies

Meteor-M2

ISS

NOAA-18

NOAA-15

NOAA-19

MetOp-A

AHRPT: 1707mhz

MetOp-B

AHRPT: 1701.3mhz

FengYun-3B

CHRPT: 1704.5mhz

FengYun-3C

CHRPT: 1698mhz

137,563200 LSB USB Hannover Information Wetter, Zeit

440,9386 MhZ Packet radio Hannover

439.862 mhz

Radioastronomie

https://4noobs.de/viewtopic.php?f=29&t=87

https://entropia.de/GPN15:Radioastronomie:_Mit_selbstgebautem_Equipment_die_Milchstra%C3%9Fe_vermessen

https://www.sciencefriday.com/articles/build-your-own-radio-telescope-to-listen-to-meteors/

http://www.radio-astronomy.org/

https://hackaday.io/project/27582-radiotelescope-interferometer-imfr11ghz

http://opensourceradiotelescopes.org/

http://blog.svenbrauch.de/2015/04/26/21cm-hydrogen-line-telescope-version-2/

http://blog.svenbrauch.de/tag/radio-telescope/

https://www.hackster.io/mariocannistra/radio-astronomy-with-rtl-sdr-rpi-and-amazon-aws-iot-45b617

https://github.com/mariocannistra

https://www.rtl-sdr.com/pictor-an-open-source-low-cost-radio-telescope-based-on-rtl-sdr/

http://www.ccera.ca/

https://github.com/byggemandboesen/H-line-software

Software

SDR

http://gqrx.dk/ – SDR Software

Digitale Betriebsarten

http://physics.princeton.edu/pulsar/K1JT/index.html – WSJT Homepage Software für WSPR und andere Betriebsarten

Satelittenfunk

http://gpredict.oz9aec.net/ – gpredict

Digital Modes

https://freedv.org/ - A Digital Voice mode for HF radio

http://www.qsl.net/hz1jw/pythonprop http://www.qsl.net/hz1jw/index.html

https://radio.linux.org.au/?sectpat=All&ordpat=title

SSTV http://users.telenet.be/on4qz/index.html

DAB+ https://www.welle.io/

CW https://github.com/rshk/pycwgen – Python CW generator

DMR https://github.com/szechyjs/dsd

https://www.public-software-group.org/radioircd

https://www.bastibl.net/projects/ https://www.bastibl.net/gqrx-for-digital-signals/

https://github.com/ChristopheJacquet/Pydemod

https://github.com/artlav/meteor_decoder

https://www.irif.fr/~jch/software/babel/ – meshed routing protocol https://github.com/fingon/pybabel/ – python babel Implementierung https://www.hamspirit.de/12299/selbstorganisierende-ad-hoc-netze-mit-babeld/

https://www.public-software-group.org/pktfec-tnc – TNC software

https://www.public-software-group.org/radioircd – radioircd irc server

https://github.com/la5nta/pat

https://github.com/craigerl/aprsd

Github Repos

https://github.com/phl0

https://github.com/DD5HT

https://github.com/dh1tw

https://github.com/VE3WZW

https://github.com/juribeparada

https://github.com/cintema

https://github.com/m1geo

https://github.com/ko7m

https://github.com/freedv

https://github.com/dh1tw/pyhamtools

https://github.com/hjd1964

https://github.com/loxodes

https://github.com/LongHairedHacker

https://github.com/F5OEO

https://gogs.zenerdio.de/sebastian

https://github.com/jmharvey1

https://github.com/0xCoto/PICTOR

https://github.com/afarhan

https://github.com/f4exb

https://github.com/poes-weather

https://github.com/altillimity

https://github.com/Supermagnum/Pirotator

https://github.com/r4d10n/mmdvm-sdr

Link Collection

Generell

https://ham.stackexchange.com/

Speziell

https://www.repeaterbook.com/ - Database of relais stations worldwide

http://physics.princeton.edu/pulsar/K1JT/index.html - Weak signal communication

https://www.facebook.com/Arduino-ARM-Ham-Radio-Projects-1726519644283112/

http://ko7m.blogspot.com/

http://diycrap.blogspot.com

http://www.vk2zay.net/ - Alan’s Lab - some amateur radio projects

http://www.m0nka.co.uk - mcHF QRP transceiver - Small and inexpensive homebrew HF radio

http://n6qw.blogspot.com - The N6QW blog collects and shares bits of information on one ham’s homebrewing activities

http://www.rowetel.com/?page_id=452 - Codec 2 - A free speech codec

https://www.tu-chemnitz.de/urz/stammtisch/rsrc/handout_Oktober2016.pdf - Open Source für Funkamateure

https://hackaday.com/2015/02/02/get-serious-with-amateur-radio-design-build-a-single-sideband-transceiver-from-scratch-part-1/

https://hackaday.com/2015/03/04/get-serious-with-amateur-radio-design-build-a-single-sideband-transceiver-from-scratch-part-2/

https://hackaday.com/2018/08/17/radio-antenna-mismatching-vswr-explained/

http://www.afug-info.de/Schaltungen-Eigenbau/Wouxun/ – Kabelbelegung Baofeng https://4.bp.blogspot.com/-9suMCd65qtg/VpvhXJSHB0I/AAAAAAAANvs/xJVZmbVveoM/s1600/baofetent.jpg – Kabelbelegung Baofeng 2 http://www.miklor.com/COM/UV_Technical.php – Kabelbelegung Baofeng 3 https://ham.stackexchange.com/questions/1891/whats-the-pinout-for-kenwood-2-5mm-trs-3-5-mm-trs-connector – Headset Pinbelegung Baofeng

http://www.sarcnet.org/projects/project_rotator.html – Antennensteuerung

https://www.dk0tu.de/users/DL5BBN/Python_Amateur_Radio_Programs/

https://hackaday.io/project/161556-tiny-radio-telescope

https://hackaday.io/project/161503-vhffm-receiver

https://hamprojects.wordpress.com/2015/06/29/vhf-beacon-and-aprs-tracker-english-version/

https://hamprojects.wordpress.com/

https://amsat-uk.org/beginners/how-to-hear-the-iss/

http://jcoppens.com/ant/qfh/calc.de.php – Rechner für QFH Antennen

http://wiki.oevsv.at/index.php?title=Interessensgruppen

https://mode-s.org/

https://media.ccc.de/v/3CGHAH

http://www.rish.kyoto-u.ac.jp/digitalbeacon/information/Building_QFH_Antenna_Guide.pdf – QFH Antenna building guide

https://windytan.github.io/slowrx/

http://www.linux-ax25.org/wiki/Main_Page

http://www.windytan.com/

https://www.windytan.com/2015/02/receiving-rds-with-rtl-sdr.html

https://github.com/DecentralizedAmateurPagingNetwork – DAPNET ein Hampager Netzwerk

https://www.qsl.net/5/5b4az//

http://www.centerforspace.com/

https://www.rtl-sdr.com/creating-a-standalone-wspr-receiver-with-an-rtl-sdr-v3-and-raspberry-pi-3/ http://rfsparkling.com/blog/2018/12/21/making-a-standalone-wspr-receiver-using-raspberry-pi-and-rtl-sdr-v3-dongle-with-rtlsdr-wsprd-software/

https://wiki.oevsv.at/index.php?title=Links

https://aa7ee.wordpress.com/ https://aa7ee.wordpress.com/2016/09/09/a-scratch-build-of-n6kr-and-wilderness-radios-sst-for-20m/

http://www.amateur-funk.de/Dateien/2m.htm

http://www.dk3wn.info/satellites.shtml

https://github.com/F5OEO/rpitx

https://hackaday.com/2016/06/02/the-minima-is-an-all-band-hf-transceiver-for-under-100/

https://github.com/afarhan/radiono

https://hackaday.com/2019/01/22/understanding-modulated-rf-with-w2aew/

https://www.sigidwiki.com/wiki/Signal_Identification_Guide

https://www.amsat.org/amsat/articles/kd2bd/9k6modem/schematics.html

http://www.f6fbb.org/

https://sites.google.com/site/g3xbmqrp3/vuhf/fredbox

https://www.qsl.net/va3iul/144MHz%20All%20Mode%20Transceiver/2m_allmode.html

http://f6feo.homebuilder.free.fr/transceiver_PICARDY.html

https://github.com/generationmake/ArduTrx

http://www.nordlink.org/

https://gogs.zenerdio.de/sebastian/ark-lna

https://buildyourownantenna.blogspot.com/2014/07/double-biquad-antenna-calculator.html

https://github.com/aerospaceresearch/DirectDemod

http://www.antennamagus.com/blog/216/making-your-own-bi-quad-wi-fi-antenna

https://hackaday.io/project/164092-npr-new-packet-radio

http://www.hamqsl.com/solar.html – Solar Data Banners & Widgets

https://hackaday.io/project/164092-npr-new-packet-radio

http://funknetzplanung.com/frequenzplan.php

http://www.dd1us.de/

https://www.arig-mn.org/ – Amateurfunk Relaisinteressengemeinschaft Mittlerer-Neckar e.V.

https://github.com/altillimity/SatDump

https://radiohacks.de

https://m17project.org/

https://www.satblog.info/