[YARDStick] OOK transmission is not in the expected size

[Cinaed Simson]

On 07/19/2017 01:30 AM, Hakan Tolgay wrote:
> 
> Hello all,
> 
> I am new to the rfcat and trying to learn it via trial and error.
> However, I couldn't find an explanation for the following behavior.
> 
> I have been trying to transmit some binary data such as 10101010 which
> is AA in hex. When I did that with the following commands, I observe
> more than 8 bits of data. You can find the links of both spectrum dump
> and the signal recording (as sound file) below. Please tell me what I
> don't know and what I am missing. Thanks

Yes, PWM or Pulse Width Modulation. Google it.

Do you know your default packet length?

Set d._debug=1 or 2 to see what's going on.

Why are you using the root account?

Look in the source of rfcat for the file 20-rfcat.rules and install it
in /etc/udev/rules.d and reboot. Then work under your userid.

See the README.nonroot.

Didn't look at the images - I don't do images.

-- Cinaed

> 
> 
> sudo rfcat -r
> 
>>>> d.setFreq(433000000)
>>>> d.setMdmModulation(MOD_ASK_OOK)
>>>> d.setMdmDRate(int(1.0/0.000550))
>>>> d.RFxmit("\xAA")
> 
> Transmission recordings:
> https://drive.google.com/drive/folders/0BxtkZc08yz6mc0tlRS1YbjgtUEU?usp=sharing
> 
> Thanks
> Hakan
> 
> 
> 
> 
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