SECRETS

MY GATE OPENER

HAS TOLD ME

AKA: SDRI third (and fourth) meetup!

 

JUNE 2016

Software Defined Radio Israel
$ git clone https://github.com/raziele/MyGateOpener

IN THIS MEETUP, WE WILL:

  1. Locate and record signal
  2. Perform visual analysis
  3. DSP: Filter, (Demodulate), and synchronize signal
  4. Extract code
Copyright © 2015-2016 Robert W. Stewart, Kenneth W. Barlee, Dale S.W. Atkinson, and Louise H. Crockett
All rights reserved.

STEP 1:

LOCATING SIGNAL'S FREQUENCY

Unlicensed frequency bands

STEP 2:

RECORDING

SampleRate \cdot 2 = 2\cdot 10^{6}[\frac{samples}{second}] \cdot 2 = 4\cdot 10^{6} [\frac{samples}{second}
SampleRate2=2106[samplessecond]2=4106[samplessecondSampleRate \cdot 2 = 2\cdot 10^{6}[\frac{samples}{second}] \cdot 2 = 4\cdot 10^{6} [\frac{samples}{second}
4\cdot 10^{6} [\frac{samples}{second}]\cdot 32[bit-float32]=128\cdot 10^{6}[\frac{bit}{second}]=16 [\frac{Mbyte}{sec}]
4106[samplessecond]32[bitfloat32]=128106[bitsecond]=16[Mbytesec]4\cdot 10^{6} [\frac{samples}{second}]\cdot 32[bit-float32]=128\cdot 10^{6}[\frac{bit}{second}]=16 [\frac{Mbyte}{sec}]

433.5MHz

/14.4

Padding to F32

STEP 3:

VISUAL ANALYSIS

1 1  1  1  1  0 0  1 0  0  1  0  0  1 0  0  1  0 0  1  0  0  1 0  0  1 0  0  1  0  1 1  0  0  1 0  0 1  0

ASK|2 levels =OOK

STEP 4:

SIGNAL PROCESSING

Time domain

Frequency domain

STEP 5:

CODE EXTRACTION

WHAT CAN WE DO WITH AN EXTRACTED CODE?

A CONNECTED GATE?

WHAT CAN YOU DO

WHEN YOU CAN:

EXTRACT CODE

(LEGALLY) TRANSMIT CODE?

Secrets my gate opener has told me

By raziele

Secrets my gate opener has told me

SDRI third meetup

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