# 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

# STEP 2:

## RECORDING

SampleRate \cdot 2 = 2\cdot 10^{6}[\frac{samples}{second}] \cdot 2 = 4\cdot 10^{6} [\frac{samples}{second}
$SampleRate \cdot 2 = 2\cdot 10^{6}[\frac{samples}{second}] \cdot 2 = 4\cdot 10^{6} [\frac{samples}{second}$
4\cdot 10^{6} [\frac{samples}{second}]\cdot 32[bit-float32]=128\cdot 10^{6}[\frac{bit}{second}]=16 [\frac{Mbyte}{sec}]
$4\cdot 10^{6} [\frac{samples}{second}]\cdot 32[bit-float32]=128\cdot 10^{6}[\frac{bit}{second}]=16 [\frac{Mbyte}{sec}]$

433.5MHz

/14.4

# 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

Time domain

Frequency domain

# WHAT CAN WE DO WITH AN EXTRACTED CODE?

A CONNECTED GATE?

# WHAT CAN YOU DO

## WHEN YOU CAN:

EXTRACT CODE

(LEGALLY) TRANSMIT CODE?

By raziele

# Secrets my gate opener has told me

SDRI third meetup

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