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WWW.PABR.ORG (EN)
www.pabr.org (en) Testing the Othernet "Bullseye BE01" LNB (2020-03-01) The Othernet Bullseye BE01 Ku-band Low-Noise Block-downconverter features a tunable 2 ppm TCXO, a 25 MHz reference output, and extended coverage for QO-100 reception. In this article I discuss its specifications, internal construction and performance.KU-BAND LNB LINE-UP
Ku-band LNB line-up 6 The following ICs appear to be popular: • "3566". Found in almost all the low-cost models. 25 MHz PLL. • RDA 3565ES. Found in higher-end models. 27 MHz PLL, mixer, biascontroller.
KU-BAND LNB LINE-UP
The only way to determine how much a LNB can be "pulled" up or down in frequency is by testing. 3.5. Noise figure. Most manufacturers claim a N.F. of 0.1 dB, which is commonly regarded as unrealistic. 3.6. Output power. There are reports that some LNBs can output TESTING THE OTHERNET "BULLSEYE BE01" LNB The Othernet Bullseye BE01 Ku-band Low-Noise Block-downconverter features a tunable 2 ppm TCXO, a 25 MHz reference output, and extended coverage for QO-100 reception. In this article I discuss its specifications, internal construction and performance. LEANDVB: A LIGHTWEIGHT SOFTWARE DVB-S/S2 DEMODULATOR leandvb is a lightweight implementation of portions of the DVB-S and DVB-S2 standards in plain C++. It is developed primarily for receiving Digital Amateur TV from the ISS and from the QO-100 geostationary transponder. **Work in progress**. As of 2019-02-12 the software and documentation are being actively updated. Expected discrepancies. SOFTWARE-DEFINED DEMODULATION OF DIGITAL AMATEUR TV FROM Software-defined demodulation of Digital Amateur TV from QO-100. Since 2019-02-14, licensed amateur radio operators can videoconference via QO-100, the first amateur transponder in geostationary orbit. In this article I explain how to receive some downlink signals with affordable off-the-shelf equipment and open-source software. BULLSEYE BE01 LNB TESTING THE OTHERNET Testing the Othernet "Bullseye BE01" LNB 4 actually better than 2 ppm as delivered; presumably the supplier adds a safety margin to accountfor
DE RÉCEPTION SATELLITE (LNB/LNBF) DANS LA PERSPECTIVE D Comparaison de têtes de réception satellite 4 • L'absence de tonalité sélectionne l'oscillateur local de 9,75 GHz. La plage basse(10,70..11,70 GHz)
COMPARAISON DE TÊTES DE RÉCEPTION SATELLITETRANSLATE THIS PAGE Comparaison de têtes de réception satellite. Dans cet article je compare les entrailles de plusieurs têtes de réception satellite (LNB/LNBF) dans la perspective d'applications en radioamateurisme. DIGITAL AMATEUR TV FROM QO-100 SOFTWARE-DEFINED 3 1. Introduction At the time of writing QO-100 is a hot topic in the amateur radio community. Introductory articles should be available shortly from numerous journals and web sites.WWW.PABR.ORG (EN)
www.pabr.org (en) Testing the Othernet "Bullseye BE01" LNB (2020-03-01) The Othernet Bullseye BE01 Ku-band Low-Noise Block-downconverter features a tunable 2 ppm TCXO, a 25 MHz reference output, and extended coverage for QO-100 reception. In this article I discuss its specifications, internal construction and performance.KU-BAND LNB LINE-UP
Ku-band LNB line-up 6 The following ICs appear to be popular: • "3566". Found in almost all the low-cost models. 25 MHz PLL. • RDA 3565ES. Found in higher-end models. 27 MHz PLL, mixer, biascontroller.
KU-BAND LNB LINE-UP
The only way to determine how much a LNB can be "pulled" up or down in frequency is by testing. 3.5. Noise figure. Most manufacturers claim a N.F. of 0.1 dB, which is commonly regarded as unrealistic. 3.6. Output power. There are reports that some LNBs can output TESTING THE OTHERNET "BULLSEYE BE01" LNB The Othernet Bullseye BE01 Ku-band Low-Noise Block-downconverter features a tunable 2 ppm TCXO, a 25 MHz reference output, and extended coverage for QO-100 reception. In this article I discuss its specifications, internal construction and performance. LEANDVB: A LIGHTWEIGHT SOFTWARE DVB-S/S2 DEMODULATOR leandvb is a lightweight implementation of portions of the DVB-S and DVB-S2 standards in plain C++. It is developed primarily for receiving Digital Amateur TV from the ISS and from the QO-100 geostationary transponder. **Work in progress**. As of 2019-02-12 the software and documentation are being actively updated. Expected discrepancies. SOFTWARE-DEFINED DEMODULATION OF DIGITAL AMATEUR TV FROM Software-defined demodulation of Digital Amateur TV from QO-100. Since 2019-02-14, licensed amateur radio operators can videoconference via QO-100, the first amateur transponder in geostationary orbit. In this article I explain how to receive some downlink signals with affordable off-the-shelf equipment and open-source software. BULLSEYE BE01 LNB TESTING THE OTHERNET Testing the Othernet "Bullseye BE01" LNB 4 actually better than 2 ppm as delivered; presumably the supplier adds a safety margin to accountfor
DE RÉCEPTION SATELLITE (LNB/LNBF) DANS LA PERSPECTIVE D Comparaison de têtes de réception satellite 4 • L'absence de tonalité sélectionne l'oscillateur local de 9,75 GHz. La plage basse(10,70..11,70 GHz)
COMPARAISON DE TÊTES DE RÉCEPTION SATELLITETRANSLATE THIS PAGE Comparaison de têtes de réception satellite. Dans cet article je compare les entrailles de plusieurs têtes de réception satellite (LNB/LNBF) dans la perspective d'applications en radioamateurisme. DIGITAL AMATEUR TV FROM QO-100 SOFTWARE-DEFINED 3 1. Introduction At the time of writing QO-100 is a hot topic in the amateur radio community. Introductory articles should be available shortly from numerous journals and web sites. BITCOIN'S CENTRALIZED ENDGAME, AND HOW TO AVOID IT Bitcoin's centralized endgame, and how to avoid it. We review 20 common misconceptions about the Bitcoin crypto-currency system and show how the reality helps predict its endgame: centralized mining, then centralized governance. We suggest that enforcing national mining quotas might be the lesser of many evils if centralization is to beavoided.
CHROMICRO - CHEAP ROBOTIC MICROHELICOPTER HOWTO (EN) ChRoMicro - Cheap Robotic Microhelicopter HOWTO (EN) RC model helicopter prices have reached a point where all sorts of challenging (i.e. crash-prone) robotics projects become affordable. This document explains how to build a 300 g helicopter with embedded Linux and Bluetooth datalink from off-the shelf components for less than 500EUR.
HOME SERVER FORM FACTOR FOR 600X300 MM ETSI RACKS Telecom cabinets come in 600x600 mm and 600x300 mm form factors; the later is suitable for home use. Mounting rails are actually wider than 19", but the standards have provisions for mounting 19" equipment with adapters. Therefore, the perfect rack-mountable home server case, described below, aims to comply with and . LEANTRX: A WEB INTERFACE FOR EMBEDDED SDR PLATFORMS LeanTRX adds a web interface to the LeanSDR toolkit. Its main purpose is to turn embedded SDR platforms into user-friendly, multi-mode RF modems which can be controlled with any web browser. Potential applications range from handheld transceivers to Internet-connected networks of ground stations. A BETTER AUDIO JACK CONSOLE CABLE FOR GOOGLE NEXUS DEVICES A better audio jack console cable for Google Nexus devices. Many Google Nexus smartphones and tablets have a serial console which can be accessed through the headset socket. This is an invaluable tool for software development. Unfortunately there are no suitable off-the-shelf adapters on the market; therefore some tinkering isrequired.
LINMCTOOL - LINUX MOTION-SENSING CONTROLLER TOOL linmctool is a command-line utility which handles Bluetooth communications with several models of motion-sensing game controllers, and outputs sensor data in plain text. It is intended as a simple and portable tool for educational and research purposes in relation to such topics as 3D coordinate systems, Newtonian physics, robotics, sensor fusion, motion tracking and new user interfaces. MICROHELICOPTER HOWTO (EN) CHROMICRO ChRoMicro - Cheap Robotic Microhelicopter HOWTO (EN) 4 • A pre-assembled helicopter with variable-collective-pitch rotor, two brushed motors and three minia- WXHMD - A WIRELESS HEAD-MOUNTED DISPLAY WITH EMBEDDED LINUX WXHMD is a Gumstix Overo Fire computer-on-module driving a Vuzix VR920 head-mounted display: Stereoscopic 640x480, audio in/out, 3D tilt sensor, 3D magnetic compass, TI OMAP3530 @ 600 MHz, Linux, WiFi, Bluetooth, 1 amp @ 3.7 volts, 180 grams. Potential applications include secure telepresence over WiFi, and "head-mounted computing" with Bluetooth peripherals. DEMODULATING THE OUTERNET SIGNAL WITH LEANDVB Demodulating the Outernet signal with leandvb. In this article I explain how to demodulate Outernet L-band satellite broadcasts with leandvb. Note. The Outernet L-band service was terminated in early 2018. The techniques developed for this project may still be relevant to other low-cost narrowband applications such as amateur satellitetelemetry.
TOWARD MOBILE LINUX DEVICES WITH AUDITABLE SECURITY Toward mobile Linux devices with auditable security. This web page documents my attempts to assemble Linux smartphones and tablets with as few non-mainstream components, binary blobs and potential backdoors as possible. Currently the best candidate is aWWW.PABR.ORG (EN)
www.pabr.org (en) Testing the Othernet "Bullseye BE01" LNB (2020-03-01) The Othernet Bullseye BE01 Ku-band Low-Noise Block-downconverter features a tunable 2 ppm TCXO, a 25 MHz reference output, and extended coverage for QO-100 reception. In this article I discuss its specifications, internal construction and performance.KU-BAND LNB LINE-UP
Ku-band LNB line-up 6 The following ICs appear to be popular: • "3566". Found in almost all the low-cost models. 25 MHz PLL. • RDA 3565ES. Found in higher-end models. 27 MHz PLL, mixer, biascontroller.
KU-BAND LNB LINE-UP
The only way to determine how much a LNB can be "pulled" up or down in frequency is by testing. 3.5. Noise figure. Most manufacturers claim a N.F. of 0.1 dB, which is commonly regarded as unrealistic. 3.6. Output power. There are reports that some LNBs can output TESTING THE OTHERNET "BULLSEYE BE01" LNB The Othernet Bullseye BE01 Ku-band Low-Noise Block-downconverter features a tunable 2 ppm TCXO, a 25 MHz reference output, and extended coverage for QO-100 reception. In this article I discuss its specifications, internal construction and performance. LEANDVB: A LIGHTWEIGHT SOFTWARE DVB-S/S2 DEMODULATOR leandvb is a lightweight implementation of portions of the DVB-S and DVB-S2 standards in plain C++. It is developed primarily for receiving Digital Amateur TV from the ISS and from the QO-100 geostationary transponder. **Work in progress**. As of 2019-02-12 the software and documentation are being actively updated. Expected discrepancies. LEANTRX: A WEB INTERFACE FOR EMBEDDED SDR PLATFORMS LeanTRX adds a web interface to the LeanSDR toolkit. Its main purpose is to turn embedded SDR platforms into user-friendly, multi-mode RF modems which can be controlled with any web browser. Potential applications range from handheld transceivers to Internet-connected networks of ground stations. SOFTWARE-DEFINED DEMODULATION OF DIGITAL AMATEUR TV FROM Software-defined demodulation of Digital Amateur TV from QO-100. Since 2019-02-14, licensed amateur radio operators can videoconference via QO-100, the first amateur transponder in geostationary orbit. In this article I explain how to receive some downlink signals with affordable off-the-shelf equipment and open-source software. BULLSEYE BE01 LNB TESTING THE OTHERNET Testing the Othernet "Bullseye BE01" LNB 4 actually better than 2 ppm as delivered; presumably the supplier adds a safety margin to accountfor
DIGITAL AMATEUR TV FROM QO-100 SOFTWARE-DEFINED 3 1. Introduction At the time of writing QO-100 is a hot topic in the amateur radio community. Introductory articles should be available shortly from numerous journals and web sites. COMPARAISON DE TÊTES DE RÉCEPTION SATELLITETRANSLATE THIS PAGE Comparaison de têtes de réception satellite. Dans cet article je compare les entrailles de plusieurs têtes de réception satellite (LNB/LNBF) dans la perspective d'applications en radioamateurisme.WWW.PABR.ORG (EN)
www.pabr.org (en) Testing the Othernet "Bullseye BE01" LNB (2020-03-01) The Othernet Bullseye BE01 Ku-band Low-Noise Block-downconverter features a tunable 2 ppm TCXO, a 25 MHz reference output, and extended coverage for QO-100 reception. In this article I discuss its specifications, internal construction and performance.KU-BAND LNB LINE-UP
Ku-band LNB line-up 6 The following ICs appear to be popular: • "3566". Found in almost all the low-cost models. 25 MHz PLL. • RDA 3565ES. Found in higher-end models. 27 MHz PLL, mixer, biascontroller.
KU-BAND LNB LINE-UP
The only way to determine how much a LNB can be "pulled" up or down in frequency is by testing. 3.5. Noise figure. Most manufacturers claim a N.F. of 0.1 dB, which is commonly regarded as unrealistic. 3.6. Output power. There are reports that some LNBs can output TESTING THE OTHERNET "BULLSEYE BE01" LNB The Othernet Bullseye BE01 Ku-band Low-Noise Block-downconverter features a tunable 2 ppm TCXO, a 25 MHz reference output, and extended coverage for QO-100 reception. In this article I discuss its specifications, internal construction and performance. LEANDVB: A LIGHTWEIGHT SOFTWARE DVB-S/S2 DEMODULATOR leandvb is a lightweight implementation of portions of the DVB-S and DVB-S2 standards in plain C++. It is developed primarily for receiving Digital Amateur TV from the ISS and from the QO-100 geostationary transponder. **Work in progress**. As of 2019-02-12 the software and documentation are being actively updated. Expected discrepancies. LEANTRX: A WEB INTERFACE FOR EMBEDDED SDR PLATFORMS LeanTRX adds a web interface to the LeanSDR toolkit. Its main purpose is to turn embedded SDR platforms into user-friendly, multi-mode RF modems which can be controlled with any web browser. Potential applications range from handheld transceivers to Internet-connected networks of ground stations. SOFTWARE-DEFINED DEMODULATION OF DIGITAL AMATEUR TV FROM Software-defined demodulation of Digital Amateur TV from QO-100. Since 2019-02-14, licensed amateur radio operators can videoconference via QO-100, the first amateur transponder in geostationary orbit. In this article I explain how to receive some downlink signals with affordable off-the-shelf equipment and open-source software. BULLSEYE BE01 LNB TESTING THE OTHERNET Testing the Othernet "Bullseye BE01" LNB 4 actually better than 2 ppm as delivered; presumably the supplier adds a safety margin to accountfor
DIGITAL AMATEUR TV FROM QO-100 SOFTWARE-DEFINED 3 1. Introduction At the time of writing QO-100 is a hot topic in the amateur radio community. Introductory articles should be available shortly from numerous journals and web sites. COMPARAISON DE TÊTES DE RÉCEPTION SATELLITETRANSLATE THIS PAGE Comparaison de têtes de réception satellite. Dans cet article je compare les entrailles de plusieurs têtes de réception satellite (LNB/LNBF) dans la perspective d'applications en radioamateurisme.WWW.PABR.ORG (EN)
www.pabr.org (en) Testing the Othernet "Bullseye BE01" LNB (2020-03-01) The Othernet Bullseye BE01 Ku-band Low-Noise Block-downconverter features a tunable 2 ppm TCXO, a 25 MHz reference output, and extended coverage for QO-100 reception. In this article I discuss its specifications, internal construction and performance. BRICKHID - DIRECT CONNECTION BETWEEN BLUETOOTH GAMEPADS A generic Linux PC with an ARM cross-compilation toolchain is recommended to compile brickhid, access the EV3 command-line, transfer files, pair the Bluetooth gamepad and start the program.. Users without a cross-compilation toolchain can either use our pre-compiled brickhid binary, or compile and run brickhid on a PC rather than on the EV3 brick. . Communications with the Mindstorms runtime LEANTRX: A WEB INTERFACE FOR EMBEDDED SDR PLATFORMS LeanTRX adds a web interface to the LeanSDR toolkit. Its main purpose is to turn embedded SDR platforms into user-friendly, multi-mode RF modems which can be controlled with any web browser. Potential applications range from handheld transceivers to Internet-connected networks of ground stations. PCBPRT - EXPERIMENTS IN INKJET PCB PRINTING Resolution. All inkjet printers sold today have sufficient resolution for PCB artwork. Most models are said to have a physical vertical resolution of either 600 dpi (1.7 mil or 42 µm) or 720 dpi (1.4 mil or 35 µm). Many manufacturers advertise "software-enhanced" resolutions up to 5760 dpi (0.17 mil or 4.4 µm). 2.4. USING THE PLAYSTATION 3 CONTROLLER IN BLUETOOTH MODE WITH Ever since the PS3 platform was released (Japan: 2006-11-11; USA: 2006-11-17; Europe: 2007-03-23) there has been speculation as to whether its wireless controller, dubbed "SIXAXIS", could be used in non-gaming applications.It is already known that the SIXAXIS operates as a regular HID device in USB mode. Since it is being marketed as a Bluetooth device, it was fair and legitimate to expect it HOME SERVER FORM FACTOR FOR 600X300 MM ETSI RACKS Telecom cabinets come in 600x600 mm and 600x300 mm form factors; the later is suitable for home use. Mounting rails are actually wider than 19", but the standards have provisions for mounting 19" equipment with adapters. Therefore, the perfect rack-mountable home server case, described below, aims to comply with and . A BETTER AUDIO JACK CONSOLE CABLE FOR GOOGLE NEXUS DEVICES A better audio jack console cable for Google Nexus devices. Many Google Nexus smartphones and tablets have a serial console which can be accessed through the headset socket. This is an invaluable tool for software development. Unfortunately there are no suitable off-the-shelf adapters on the market; therefore some tinkering isrequired.
DEMODULATING THE OUTERNET SIGNAL WITH LEANDVB Demodulating the Outernet signal with leandvb. In this article I explain how to demodulate Outernet L-band satellite broadcasts with leandvb. Note. The Outernet L-band service was terminated in early 2018. The techniques developed for this project may still be relevant to other low-cost narrowband applications such as amateur satellitetelemetry.
DE RÉCEPTION SATELLITE (LNB/LNBF) DANS LA PERSPECTIVE D Comparaison de têtes de réception satellite 4 • L'absence de tonalité sélectionne l'oscillateur local de 9,75 GHz. La plage basse(10,70..11,70 GHz)
AMATEUR TV FROM THE ISS SDR RECEPTION OF DIGITAL SDR reception of Digital Amateur TV from the ISS 6 6. Run gqrx. Tune to 1255 MHz (or 3650 MHz minus the transmit frequency, if not 2395 MHz). 7. Adjust gains: GC1~40dB, GC2=0, ADC-pga=0.WWW.PABR.ORG (EN)
www.pabr.org (en) Testing the Othernet "Bullseye BE01" LNB (2020-03-01) The Othernet Bullseye BE01 Ku-band Low-Noise Block-downconverter features a tunable 2 ppm TCXO, a 25 MHz reference output, and extended coverage for QO-100 reception. In this article I discuss its specifications, internal construction and performance.KU-BAND LNB LINE-UP
Ku-band LNB line-up 6 The following ICs appear to be popular: • "3566". Found in almost all the low-cost models. 25 MHz PLL. • RDA 3565ES. Found in higher-end models. 27 MHz PLL, mixer, biascontroller.
KU-BAND LNB LINE-UP
The only way to determine how much a LNB can be "pulled" up or down in frequency is by testing. 3.5. Noise figure. Most manufacturers claim a N.F. of 0.1 dB, which is commonly regarded as unrealistic. 3.6. Output power. There are reports that some LNBs can output TESTING THE OTHERNET "BULLSEYE BE01" LNB The Othernet Bullseye BE01 Ku-band Low-Noise Block-downconverter features a tunable 2 ppm TCXO, a 25 MHz reference output, and extended coverage for QO-100 reception. In this article I discuss its specifications, internal construction and performance. LEANDVB: A LIGHTWEIGHT SOFTWARE DVB-S/S2 DEMODULATOR leandvb is a lightweight implementation of portions of the DVB-S and DVB-S2 standards in plain C++. It is developed primarily for receiving Digital Amateur TV from the ISS and from the QO-100 geostationary transponder. **Work in progress**. As of 2019-02-12 the software and documentation are being actively updated. Expected discrepancies. LEANTRX: A WEB INTERFACE FOR EMBEDDED SDR PLATFORMS LeanTRX adds a web interface to the LeanSDR toolkit. Its main purpose is to turn embedded SDR platforms into user-friendly, multi-mode RF modems which can be controlled with any web browser. Potential applications range from handheld transceivers to Internet-connected networks of ground stations. SOFTWARE-DEFINED DEMODULATION OF DIGITAL AMATEUR TV FROM Software-defined demodulation of Digital Amateur TV from QO-100. Since 2019-02-14, licensed amateur radio operators can videoconference via QO-100, the first amateur transponder in geostationary orbit. In this article I explain how to receive some downlink signals with affordable off-the-shelf equipment and open-source software. BULLSEYE BE01 LNB TESTING THE OTHERNET Testing the Othernet "Bullseye BE01" LNB 4 actually better than 2 ppm as delivered; presumably the supplier adds a safety margin to accountfor
DIGITAL AMATEUR TV FROM QO-100 SOFTWARE-DEFINED 3 1. Introduction At the time of writing QO-100 is a hot topic in the amateur radio community. Introductory articles should be available shortly from numerous journals and web sites. COMPARAISON DE TÊTES DE RÉCEPTION SATELLITETRANSLATE THIS PAGE Comparaison de têtes de réception satellite. Dans cet article je compare les entrailles de plusieurs têtes de réception satellite (LNB/LNBF) dans la perspective d'applications en radioamateurisme.WWW.PABR.ORG (EN)
www.pabr.org (en) Testing the Othernet "Bullseye BE01" LNB (2020-03-01) The Othernet Bullseye BE01 Ku-band Low-Noise Block-downconverter features a tunable 2 ppm TCXO, a 25 MHz reference output, and extended coverage for QO-100 reception. In this article I discuss its specifications, internal construction and performance.KU-BAND LNB LINE-UP
Ku-band LNB line-up 6 The following ICs appear to be popular: • "3566". Found in almost all the low-cost models. 25 MHz PLL. • RDA 3565ES. Found in higher-end models. 27 MHz PLL, mixer, biascontroller.
KU-BAND LNB LINE-UP
The only way to determine how much a LNB can be "pulled" up or down in frequency is by testing. 3.5. Noise figure. Most manufacturers claim a N.F. of 0.1 dB, which is commonly regarded as unrealistic. 3.6. Output power. There are reports that some LNBs can output TESTING THE OTHERNET "BULLSEYE BE01" LNB The Othernet Bullseye BE01 Ku-band Low-Noise Block-downconverter features a tunable 2 ppm TCXO, a 25 MHz reference output, and extended coverage for QO-100 reception. In this article I discuss its specifications, internal construction and performance. LEANDVB: A LIGHTWEIGHT SOFTWARE DVB-S/S2 DEMODULATOR leandvb is a lightweight implementation of portions of the DVB-S and DVB-S2 standards in plain C++. It is developed primarily for receiving Digital Amateur TV from the ISS and from the QO-100 geostationary transponder. **Work in progress**. As of 2019-02-12 the software and documentation are being actively updated. Expected discrepancies. LEANTRX: A WEB INTERFACE FOR EMBEDDED SDR PLATFORMS LeanTRX adds a web interface to the LeanSDR toolkit. Its main purpose is to turn embedded SDR platforms into user-friendly, multi-mode RF modems which can be controlled with any web browser. Potential applications range from handheld transceivers to Internet-connected networks of ground stations. SOFTWARE-DEFINED DEMODULATION OF DIGITAL AMATEUR TV FROM Software-defined demodulation of Digital Amateur TV from QO-100. Since 2019-02-14, licensed amateur radio operators can videoconference via QO-100, the first amateur transponder in geostationary orbit. In this article I explain how to receive some downlink signals with affordable off-the-shelf equipment and open-source software. BULLSEYE BE01 LNB TESTING THE OTHERNET Testing the Othernet "Bullseye BE01" LNB 4 actually better than 2 ppm as delivered; presumably the supplier adds a safety margin to accountfor
DIGITAL AMATEUR TV FROM QO-100 SOFTWARE-DEFINED 3 1. Introduction At the time of writing QO-100 is a hot topic in the amateur radio community. Introductory articles should be available shortly from numerous journals and web sites. COMPARAISON DE TÊTES DE RÉCEPTION SATELLITETRANSLATE THIS PAGE Comparaison de têtes de réception satellite. Dans cet article je compare les entrailles de plusieurs têtes de réception satellite (LNB/LNBF) dans la perspective d'applications en radioamateurisme.WWW.PABR.ORG (EN)
www.pabr.org (en) Testing the Othernet "Bullseye BE01" LNB (2020-03-01) The Othernet Bullseye BE01 Ku-band Low-Noise Block-downconverter features a tunable 2 ppm TCXO, a 25 MHz reference output, and extended coverage for QO-100 reception. In this article I discuss its specifications, internal construction and performance. BRICKHID - DIRECT CONNECTION BETWEEN BLUETOOTH GAMEPADS A generic Linux PC with an ARM cross-compilation toolchain is recommended to compile brickhid, access the EV3 command-line, transfer files, pair the Bluetooth gamepad and start the program.. Users without a cross-compilation toolchain can either use our pre-compiled brickhid binary, or compile and run brickhid on a PC rather than on the EV3 brick. . Communications with the Mindstorms runtime LEANTRX: A WEB INTERFACE FOR EMBEDDED SDR PLATFORMS LeanTRX adds a web interface to the LeanSDR toolkit. Its main purpose is to turn embedded SDR platforms into user-friendly, multi-mode RF modems which can be controlled with any web browser. Potential applications range from handheld transceivers to Internet-connected networks of ground stations. PCBPRT - EXPERIMENTS IN INKJET PCB PRINTING Resolution. All inkjet printers sold today have sufficient resolution for PCB artwork. Most models are said to have a physical vertical resolution of either 600 dpi (1.7 mil or 42 µm) or 720 dpi (1.4 mil or 35 µm). Many manufacturers advertise "software-enhanced" resolutions up to 5760 dpi (0.17 mil or 4.4 µm). 2.4. USING THE PLAYSTATION 3 CONTROLLER IN BLUETOOTH MODE WITH Ever since the PS3 platform was released (Japan: 2006-11-11; USA: 2006-11-17; Europe: 2007-03-23) there has been speculation as to whether its wireless controller, dubbed "SIXAXIS", could be used in non-gaming applications.It is already known that the SIXAXIS operates as a regular HID device in USB mode. Since it is being marketed as a Bluetooth device, it was fair and legitimate to expect it HOME SERVER FORM FACTOR FOR 600X300 MM ETSI RACKS Telecom cabinets come in 600x600 mm and 600x300 mm form factors; the later is suitable for home use. Mounting rails are actually wider than 19", but the standards have provisions for mounting 19" equipment with adapters. Therefore, the perfect rack-mountable home server case, described below, aims to comply with and . A BETTER AUDIO JACK CONSOLE CABLE FOR GOOGLE NEXUS DEVICES A better audio jack console cable for Google Nexus devices. Many Google Nexus smartphones and tablets have a serial console which can be accessed through the headset socket. This is an invaluable tool for software development. Unfortunately there are no suitable off-the-shelf adapters on the market; therefore some tinkering isrequired.
DEMODULATING THE OUTERNET SIGNAL WITH LEANDVB Demodulating the Outernet signal with leandvb. In this article I explain how to demodulate Outernet L-band satellite broadcasts with leandvb. Note. The Outernet L-band service was terminated in early 2018. The techniques developed for this project may still be relevant to other low-cost narrowband applications such as amateur satellitetelemetry.
DE RÉCEPTION SATELLITE (LNB/LNBF) DANS LA PERSPECTIVE D Comparaison de têtes de réception satellite 4 • L'absence de tonalité sélectionne l'oscillateur local de 9,75 GHz. La plage basse(10,70..11,70 GHz)
AMATEUR TV FROM THE ISS SDR RECEPTION OF DIGITAL SDR reception of Digital Amateur TV from the ISS 6 6. Run gqrx. Tune to 1255 MHz (or 3650 MHz minus the transmit frequency, if not 2395 MHz). 7. Adjust gains: GC1~40dB, GC2=0, ADC-pga=0. www.pabr.org and its partners would like to use cookies and similar technologies to personalize ads and analyze traffic. More information | Configure| ACCEPT
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use - Cookies | Contact ------------------------- WWW.PABR.ORG PUBLISHES DIY PROJECTS AND OTHER EDUCATIONAL RESOURCES IN VARIOUS FIELDS OF SCIENCE AND TECHNOLOGY. TESTING THE OTHERNET "BULLSEYE BE01" LNB(2020-03-01)
The Othernet Bullseye BE01 Ku-band Low-Noise Block-downconverter features a tunable 2 ppm TCXO, a 25 MHz reference output, and extended coverage for QO-100 reception. In this article I discuss its specifications, internal construction and performance.READ MORE...
SOFTWARE-DEFINED DEMODULATION OF DIGITAL AMATEUR TV FROM QO-100(2019-02-22)
Since 2019-02-14, licensed amateur radio operators can videoconference via QO-100, the first amateur transponder in geostationary orbit. In this article I explain how to receive some downlink signals with affordable off-the-shelf equipment and open-source software. I also discuss the current limitations of this approach relative to existing solutions. *** Work in progress ***READ MORE...
KU-BAND LNB LINE-UP (2018-11-01) In this article I document the internal construction of several off-the-shelf Ku-band low noise block downconverters (LNB/LNBF) from the perspective of amateur radio applications.READ MORE...
LEANTRX: A WEB INTERFACE FOR EMBEDDED SDR PLATFORMS(2018-02-11)
LeanTRX adds a web interface to the LeanSDR toolkit. Its main purpose is to turn embedded SDR platforms into user-friendly, multi-mode RF modems which can be controlled with any web browser. Potential applications range from handheld transceivers to Internet-connected networks of ground stations.READ MORE...
DEMODULATING THE OUTERNET SIGNAL WITH LEANDVB(2017-06-13)
In this article I explain how to demodulate Outernet L-band satellite broadcasts with leandvb . Note The Outernet L-band service was terminated in early 2018. The techniques developed for this project may still be relevant to other low-cost narrowband applications such as amateur satellite telemetry.READ MORE...
TOWARD THERMOELECTRIC PRODUCTION OF DRY ICE ?(2016-09-18)
In this project I try to make dry ice by cooling carbon dioxide to -80°C with Peltier modules.READ MORE...
HAMPADS: HAM-PORTABLE AFFORDABLE DISH FOR SATELLITES(2016-03-20)
A shoulder-mounted dish, tracking system and SDR receiver for amateur radio communications, originally designed for receiving HamTV digital video transmissions from the International Space Station.READ MORE...
LEANDVB: A LIGHTWEIGHT SOFTWARE DVB-S/S2 DEMODULATOR(2016-02-19)
leandvb is a lightweight implementation of portions of the DVB-S and DVB-S2 standards in plain C++. It is developed primarily for receiving Digital Amateur TV from the ISS and from the QO-100 geostationary transponder. **Work in progress** As of 2019-02-12 the software and documentation are being actively updated. Expected discrepancies.READ MORE...
SDR RECEPTION OF DIGITAL AMATEUR TV FROM THE ISS(2015-10-13)
How to receive DVB-S digital video transmissions from the International Space Station with a bit of hardware and a lot ofsoftware.
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TOWARD MOBILE LINUX DEVICES WITH AUDITABLE SECURITY(2015-09-23)
This web page documents my attempts to assemble Linux smartphones and tablets with as few non-mainstream components, binary blobs and potential backdoors as possible. Currently the best candidate is a Lenovo Yoga Tablet 2 851 running Fedora 22.READ MORE...
A BETTER AUDIO JACK CONSOLE CABLE FOR GOOGLE NEXUS DEVICES(2015-09-04)
Many Google Nexus smartphones and tablets have a serial console which can be accessed through the headset socket. This is an invaluable tool for software development. Unfortunately there are no suitable off-the-shelf adapters on the market; therefore some tinkering isrequired.
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FIRST-PERSON VIEW AND REMOTE CONTROL WITH LEGO MINDSTORMS EV3(2014-12-14)
We add FPV and RC functionality to a LEGO Mindstorms EV3 vehicle with a PlayStation gamepad, USB webcams, a smartphone-based stereoscopic head-mounted display, and the alternative operating system ev3dev.READ MORE...
SEEING THE WORLD THROUGH A DEPTH-SENSING CAMERA(2014-11-10)
In this project we attach a depth-sensing camera to a head-mounted stereoscopic display (think: Kinect + Google Cardboard). The resulting portable device allows users to see their surroundings in unusualways.
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BRICKHID - DIRECT CONNECTION BETWEEN BLUETOOTH GAMEPADS AND LEGO MINDSTORMS EV3 (2014-10-24) We show how to interface LEGO Mindstorms EV3 directly with off-the-shelf Bluetooth gamepads and joysticks such as the PS3 SIXAXIS and DualShock 3 controllers.READ MORE...
BITCOIN'S CENTRALIZED ENDGAME, AND HOW TO AVOID IT(2014-09-03)
We review 20 common misconceptions about the Bitcoin crypto-currency system and show how the reality helps predict its endgame: centralized mining, then centralized governance. We suggest that enforcing national mining quotas might be the lesser of many evils if centralization is to be avoided. More generally, we introduce the idea of maximally-distrustful oligopolies as a practical solution to distributed consensus.READ MORE...
THE SCIENCE OF GARDEN SWIMMING POOLS(2014-06-29)
How an engineer looks at kiddie pools: tensile strength of curved walls, thermal conductivity, evaporative cooling, blackbody radiation, Sun ephemerides, and water sanitation techniques.READ MORE...
A TAXONOMY OF HEARTBLEED ATTACKS(2014-04-16)
One week after the disclosure of the Heartbleed vulnerability, security experts are still discovering new ways it could affect online security. This document attempts to classify attack patterns and their countermeasures as they emerge. It will help you understand whether you really need to change your passwords, why it was unwise to do it too early, and why you should know whether your browser detects revoked certificates.READ MORE...
INTERESTING FACTOIDS IN SCIENCE AND TECHNOLOGY(2014-01-22)
A collection of little-known, counter-intuitive or otherwise enlightening facts in various fields of science and technology.READ MORE...
LOAD-TESTING GENERATORS WITH GRAY CODES(2012-10-01)
Digital circuit theory meets gasoline engines as we design a monotonically-adjustable, low-component-count dummy load suitable for testing electric generators in the kilowatt range.READ MORE...
HOMODYNE MEASUREMENT OF EARTH'S ROTATION WITH A MOTION-SENSING VIDEOGAME CONTROLLER AND A RECORD PLAYER(2011-02-10)
Got a PlayStation Move and an old vinyl turntable ? You can try to detect Earth's rotation, find geographic north, and determine yourlatitude.
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LINMCTOOL - LINUX MOTION-SENSING CONTROLLER TOOL(2010-11-17)
linmctool provides minimal support for popular Bluetooth motion-sensing game controllers on Linux: PlayStation Motion Controller (PS Move), Sixaxis, DualShock3, Wii Remote (Wiimote).READ MORE...
WXHMD - A WIRELESS HEAD-MOUNTED DISPLAY WITH EMBEDDED LINUX(2009-09-01)
WXHMD is a Gumstix Overo Fire computer-on-module driving a Vuzix VR920 head-mounted display: Stereoscopic 640x480, audio in/out, 3D tilt sensor, 3D magnetic compass, TI OMAP3530 @ 600 MHz, Linux, WiFi, Bluetooth, 1 amp @ 3.7 volts, 180 grams. Potential applications include secure telepresence over WiFi, and "head-mounted computing" with Bluetooth peripherals.READ MORE...
PCBPRT - EXPERIMENTS IN INKJET PCB PRINTING(2009-09-01)
For the last few years hobbyists worldwide have been experimenting with inkjet PCB printing, i.e. manufacturing electronic circuit boards with inkjet printers. This is a report on my experience with thistechnique.
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HOME SERVER FORM FACTOR FOR 600X300 MM ETSI RACKS(2008-04-29)
I argue that manufacturers of home servers and NAS appliances should standardize on the half-depth ETSI subrack form-factor and cabling conventions: 19" mounting plate, 240 mm deep, all connectors on thefront panel.
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USING THE PLAYSTATION 3 CONTROLLER IN BLUETOOTH MODE WITH LINUX(2007-04-23)
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PXARC - R/C AND ROBOTICS SOFTWARE FOR LINUX/PXA255/PXA270(2005-06-02)
pxaRC is a collection of drivers and utilities for remote-control and robotics applications on Linux/PXA255/PXA270-based platforms such as the Gumstix basix, connex and verdex motherboards.READ MORE...
CFCAM - CONNECTING A CMOS CAMERA TO A GUMSTIX CONNEX MOTHERBOARD(2006-09-12)
This document explains how to connect a digital CMOS image sensor directly to the CompactFlash port of a Gumstix Connex computer (or similar PXA255-based platform).READ MORE...
CHROMICRO - CHEAP ROBOTIC MICROHELICOPTER HOWTO (EN)(2005-06-02)
RC model helicopter prices have reached a point where all sorts of challenging (i.e. crash-prone) robotics projects become affordable. This document explains how to build a 300 g helicopter with embedded Linux and Bluetooth datalink from off-the shelf components for lessthan 500 EUR.
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