Архив за 19.07.2018

Comment on New Product: RTL-SDR Blog 1090 MHz ADS-B LNA by John H.

Nevermind on the last question, I found the answer here:
https://discussions.flightaware.com/t/enable-biast-on-rtl-sdr-v3-before-dump-fa-piaware-start/20046/16

Comment on New Product: RTL-SDR Blog 1090 MHz ADS-B LNA by John H.

I have three questions:

What is the operational ambient temperature range of this unit? I am in west Texas and the antenna is mounted on a mast while the Pi is in an enclosure connected via 25′ of LMR400, so the LNA will be mounted on the mast (on the north side of the mast to shield from direct sunlight), and it has been steadily 100+ degrees out here.

I have a gas tube on the antenna and am wondering if it being grounded would affect the bias-t negatively.

Does the bias-t stay enabled after reboots, and if not would a cron job run @reboot be sufficient to enable it before piaware starts running and locks out the command?

Ну что ж, собраны несколько пультов V 1.0, комплектующие еще есть, потихоньку…








Ну что ж, собраны несколько пультов V 1.0, комплектующие еще есть, потихоньку собираю дальше, так что можно объявить старт продаж.
Версия 1.0 - базовая, конструктивно "бутерброд"из 3х плат: основная средняя, нижняя в качестве основания, верхняя играет роль лицевой панели. Между собой скреплены на латунных распорках.

Сердце - ARDUINO NANO V3.0
Реализовано:
- настройка частоты приема с кратностью 1кГц, 100кГц, 1мГц(добавочно 50гц)
- регулировка громкости +/-
- отключение звука (mute)
- переключение FM mono/stereo (длинное нажатие - шаг 50гц)
- переключение видов модуляции
- включение/выключение шумоподавителя
- регулировка порога шумоподавителя +/-
- регулировка ширины полосы +/-
- переключение диапазонов 160м,80м,40м,25м,13м.10м,FM,AVIA,2м,70cм

Упаковывается в гофрокороб и защитную пленку, потом в почтовый п/э пакет
комплектация
Пульт V 1.0
Кабель USB
Инструкция на русском языке

Самостоятельно нужно установить плагин NET remote и при необходимости (если автоматом не распознает) драйвер для ардуино

Grouping data into chunks for packet transmission in GNURadio?

I'm working on a project that will transmit and receive a file using the IEEE 802.15.4 900 MHz BPSK standard. I first want to group the data into chunks so that I can attach the MAC and PHY headers to each payload. How can I go about this when the incoming stream of data is continuously being read from a file source?

The goal is to send an image wirelessly using a HackRF over the 900 MHz ISM band, and to receive it using an RTL-SDR dongle.

submitted by /u/engrstudent1
[link] [comments]

Signal Identification Help • Re: what is this signal on 167 mhz ?

POCSAG paging signal.

Statistics: Posted by Remon — Thu Jul 19, 2018 9:35 pm


Comment on Using a HackRF to Spoof GPS Navigation in Cars and Divert Drivers by snn47

PS.: I forgot to add, that to make things more difficult he would have to spoof not only 1575 MHz, but also the other civil GNSS signals transmitted at between 1176 and 1215 MHz.

Comment on Using a HackRF to Spoof GPS Navigation in Cars and Divert Drivers by snn47

PS²: ICAO is currently working on standardizing multiconstallation GNSS receiver (using 2 or more systems e.g. Gallileo, Glonas and GPS). With multiconstallation GNSS receiver a spoofer would therefore also have to spoof the other systems used by multiconstallation receiver. To make things more diffuicult he would have to spoof not only 1575 MHz but also the other civil GNSS signals transmitted at between 1176 and 1215 MHz.

Troubleshooting Help • Re: SDR# + Windows 10 Pro + gr-dect2?

Can the RTL-SDR tune to DECT signals? The signals are between 1880 and 1900 MHz.

Statistics: Posted by Remon — Thu Jul 19, 2018 9:33 pm


Comment on Using a HackRF to Spoof GPS Navigation in Cars and Divert Drivers by snn47

Why should Galileo be different to other GNSS(Global Naviagtion Satellite Services) signals like GPS. All GNSS systems signals are close to receiver noise, therefore spoofing is possible for all GNSS systems. However if you have multiconstallation GNSS receiver it would detect a discrapency between the the spoofed and the other GNSS systems used. A spoofer would therefore also have to spoof the other systems used by multiconstallation receiver.

Comment on Using a HackRF to Spoof GPS Navigation in Cars and Divert Drivers by snn47

While it looks impressive in films, it authorsdo not check if their ideas match reality, meanin is it possible. Naviagtion equipment communicates via the same ARINC bus on board. Aircrafts use barometric altimeter and RA (Radar Altimeter for APP and landing) and not to my knowledge GNSS (Global Naviagtion Satellite Services Gallileo, Glonas and GPS) derived Altitude or FL. Further complicating things aircraft equipage and systems can differ for the same aircraft type, depending on the equipment that an airline ordered.

Aircraft either fly VFR (Visual Flight Rules) which means “visual”, or fly IFR (Instrument Flight Rules). IFR requires equippage with ILS, NDB, VOR and DME for naviagtion, wich are the primary terestrial ICAO navigation systems.

Since interfernce of GNSS is possible ICAO GNSS is not certified for sole means use for navigation, APP and landing. ICAO defined DME/DME as PRNAV backup in case of GNSS failure.

PS.: GNSS interference by military-jamming or civil use e.g. by privacy devices used in cars and trucks to jam GNSS tracking of vehicles. Privacy devices already produced problems in the past, when operated close to airports, first detected in JFK by FAA when I remeber correctly.

Spoofing is more problematic since the GNSS receiver cannot distinguish between real and spoofing signals. But since GNSS is not sole means for IFR, it is not possible since wrong positions by GNSS spoofing would raise an alarm in the FMS when the GNSS coordinates differ from the inertial naviagtion and VOR/DME and DME/DME derived position of an aircraft.

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