Tagged: gps

Hakology Day 45 : Blog Entry

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Woke up very late today but respectively I had a very late night last night, tweaking the rpi/reddit/python/arduino project. Im having issues with serial communication somewhere there’s a few bits / bytes being lost? It very irregular and after a little bit of debugging I think its either the serial message get out of sync and missed part of the message or the arduino is rejecting certain characters. The reddit API JSON comes utf-8 encoded and needs converting to ASCII before I send it to the arduino, I’m processing the string to remove and replace irregular characters, I’m going to try changing the baud rate later see if this has an impact.

RE. Wardriving idk if it was where I had the GPS dongle positioned in the car but the GPS co-ords I converted to KML where ALL OVER THE PLACE so maybe its down to kismet and the –use-nmea-gps option this is the only thing I’ve really changed since I last went out. (Regardless of GPS I still managed to get some good data.)

The LED matrix project is looking very slick now, apart from the serial message issues I’m pretty darn happy with it.

Managed to get my keyboard in the post this morning on its way back to the manufacturer for the second time, think I’ve mentioned this before but, really hope they get it right this time (I’ve even requested they send me a different model this time round.) *fingers crossed*
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[1813]
Chores done thinking about doing a vblog assembling a small FM transmitter I purchased from ebay. Will try and get the next main hakology video done first though.
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[1958]
Im only rendering the sdr# video! … still dont have the perfect solution for screen capture but its done now … the audio is terrible near the start next time will record on another device as noise supression appears to be playing hell with my laptop capture, meh, its done now time to move on and not make that mistake in future.
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[2324]
Todays VBLOG I made an FM transmitter from a small kit I purchased on ebay. Just rendering the video and preparing to upload it. This by far was the most enjoyable vblog I’ve done so far may be more to come like it.
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[0043]

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Hakology – Introduction to SDR

What is SDR?

S.D.R. stands for Software Defined Radio.

SDR is a combination of hardware and software used to scan/monitor/demodulate/transmit electromagnetic radio signals.

Signals?

Signals can be used to transmit voice or data.
The most common methods of transmission are FM and AM.

FM = Frequency modulation

AM = Amplitude modulation

FM, modulates the frequency of the carrier wave to transmit a signal.
AM, modulates the amplitude of the carrier wave to transmit a signal.

Both can be used to transmit analogue or digital data.

SDR setup?

You will need …
PC / laptop – Laptop preferably for portability, currently running on an i5 2.4ghz 8gb ram pretty smoothly, I did try this on an older atom processor on linux using gqrx but latency was an issue.

SDR dongleĀ  – RTL2832U – If you want to follow along with the next few videos grab an RTL dongle you can always decided if you like the hobby enough to invest in more expensive equipment at a later date.

Antenna – You can use the one provided but its not recommended for the next few videos ill be using a cheap airband antenna I bought from ebay.

Realtek DVB-T+DAB+FM Dongle

RTL2832U – Notes: The dongle was never intended to be used for SDR but two researchers discovered the chip used was able to cover a wide range of frequencies (24 mhz – 1766 mhz) and decided to rewrite the drivers. (Antii Palosaari and Eric Fry of Osmocom) Since then the dongle has proved hugely successful with amateur radio enthusiasts.

So what can you do with SDR?

Voice, ADSB, ACARS, digital voice, AIS, POCSAG, FLEX, consumer devices, weather ballon data, HAM internet, DVB-T, GSM, GPS, spectrum analysis, weather satellites, ISS, radio astronomy, meteor scatter, FM/AM radio, RDS, DAB, RNG … probably much more!

Over the last few years lots of researchers and developers have started producing applications and code for the RTLSDR and hopefully many more projects to come as the community grows.

Keep tuned for more SDR fun stuff!

If you get bored in the meantime try googling some of the stuff I’ve listed above and start your own research / project / experiment / learning / hack / etc.

Useful links:
https://en.wikipedia.org/wiki/Radio
https://en.wikipedia.org/wiki/AM_broadcasting
https://en.wikipedia.org/wiki/FM_broadcasting
https://en.wikipedia.org/wiki/Software-defined_radio
http://www.sigidwiki.com/wiki/Signal_Identification_Guide

 

Hakology : gps-logger pineapple MK5 infusion released

So earlier this month I released the first version of a custom infusion for the wifi pineapple. Its currently available via the bartender interface and is also live on http://wifipineapple.com/ the initial release is a little rough but that means there’s plenty of room for refinement. If any of you own a pineapple i’d love to hear your feed back on the module. The infusion is designed to work with any gpsd compatible dongle. When I get some free time ill post a tutorial on here to demonstrate the infusion.
Have fun hacking!
Peace
Tea