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Audio FMCW

Wiki - Thu, 15/08/2019 - 12:57

Balint: /* Introduction */ Fix link

== Introduction ==

To demonstrate RADAR concepts without RF/an SDR, it's possible to use a sound card to generate a FMCW chirp and receive any returns. The caveat is that without special processing, it is usually not possible to synchronise the TX and RX streams in consumer audio cards.

This can be demonstrated in GNU Radio with a simple [https://github.com/balint256/gr-baz/blob/master/examples/Audio%20FMCW.grc flow graph] (and some additional visualisation blocks).

== Video ==

* [https://youtu.be/psuEzxFJnZY?t=2126 DEF CON 25 Wireless Village 2017]
* [https://youtu.be/yZ5G0nYSM98?t=4138 DEF CON 24 Wireless Village 2016]
Categories: Wiki

HF Interference

YouTube - Mon, 13/11/2017 - 03:44
HF Interference
VDSL? PLC? Something else? Using baudline, video shows HF spectrum while changing baudline FFT Overlap and Jump Step values to show a range of (short) time periods on the waterfall. From: balint256 Views: 236 2 ratings Time: 01:16 More in Science & Technology
Categories: Off-site

HF spectrum changing as loop antenna rotates

YouTube - Mon, 13/11/2017 - 03:21
HF spectrum changing as loop antenna rotates
Recorded while loop antenna is rotating from 0 to 180, and then back 0 degrees. From: balint256 Views: 273 3 ratings Time: 01:10 More in Science & Technology
Categories: Off-site

HF Interference

YouTube - Mon, 13/11/2017 - 03:07
HF Interference
What is causing this interference? First theory was VDSL, however the general opinion is PLC/PLT? What do you think? Something else? From: balint256 Views: 221 3 ratings Time: 00:19 More in Science & Technology
Categories: Off-site

GPS track of flight between Sydney and Melbourne using Navman

Balint's Blog - Thu, 19/05/2011 - 21:29

This is what you get when you blutac a GPS receiver to your window when going for a domestic flight. Altitude is colour coded.

YMML-YSSY

Taking off from Sydney:

Navman

Take off

Here, speed is colour coded:

Speed

You can download the YMML-YSSY trip: YMML-YSSY

Categories: Blog
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