User Tools

Site Tools


TAG: rf

Active Wideband Receiver Antenna for your SDR

Software Defined Radio (SDR) has finally reached a much broader mass of people, who wanted to play with RF technology, but didn't find the time or resources to learn all necessary skills, to build a hardware based radio. Thanks to the work of the GNU-Radio and OsmoCom developer crowd, this barrier is finally gone and everyone can, more or less, directly access, what the antenna receives.

Elonics E4000 complete reference documents leaked

Good news for anyone playing and developing cheap SDR technology with the Elonics E4000 (e4k) tuner chip: Until now, working with the chip has mostly been guesswork and trial and error through reverse engineering, in order to get the SDR's to work. Today the complete Elonics E4000 reference documentation was leaked, so grab and mirror the e4k datasheets and application notes, while they are hot and available:

Hacking RF controlled power switches with HackRF

In order to learn more about GNU Radio and HackRF, so that tackling more complex scenarios like The DARC side of Munich become easier, it was time to go for a much simpler training target: Those cheap RF controlled wall plugs you can use to remote control the power outlets. Now, I'm not talking about FS20, x10 or HomeMatic devices but the really cheap ones you can usually buy in sets of three combined with a handheld remote controller for 10-20 EUR.

Joint Statement against Radio Lockdown

The Radio Lockdown Directive threatens user rights and Free Software, fair competition, innovation, environment, and volunteering – without comparable benefits for security. Many organisations and companies are joining up in proposing measures to EU institutions and EU member states to avoid these negative implications while keeping the Directive's goal intact. Please read the in-depth and constantly updated analysis and support the efforts of the FSFE where you can.

NFM GNU-Radio Receiver for RTL/OsmoSDR

Soon after the release of RTL-SDR a lot of people started to play with software defined radios. Although the Elonics E4000 tuner and the Realtek RTL2832U Chip are a long way from the quality and performance/stability of an USRP(2), the price of $11 - EUR30 makes these devices an ideal beginners device for SDR experiments, without having to invest +$1k into hardware.

The DARC Knight rises

It seems like it's time to pre-warm our oscillators and prepare our SDRs for more DARC action in the near future. For more than the last 4 month, the traffic to The DARC side of Munich revealed an interesting pattern: There was a steady increase of traffic coming first from the big European & Asian automobile manufacturers, then from automotive subcontractors globally and now from Asian electronics manufacturers.

The DARC side of Munich

When you live in Munich and use public transportation, especially Buses and Trams, you will have noticed that during the last couple of month a lot of new displays appeared at almost any station which had no real-time info display before. They obviously have no cables/connections and no visible antennas, so I kept wondering:

UmTRX publicly released

The UmTRX is a dual-channel, wide-band SDR transceiver (so it can send & receive) with 1GbE connection. It is developed by Fairwaves team to be used as a transceiver for OpenBTS GSM base stations, but due to its software defined nature, it could be used for many other radio applications as well.