Back Under new domain

Was occupied with some work. Now I am coming back, but the thing is I lost my bpcu.blogspot.com domain name, now I am going to run things under bpcu1.blogspot.com domain. I know no one reads this, but for the few people who read, this is your PSA. I'll also slowly be working on restoring all my old articles from wayabck.

Comments

Post a Comment

Popular posts from this blog

Software Defined Radio (SDR) 101(Originally published on Monday, June 8, 2020)

  Software Defined Radio (SDR) 101. What is an SDR? A Software-Defined Radio(SDR), is a radio environment that has all the front end devices(amplifiers, mixers, IQ units, CPLD, mod/demod equipment) in hardware and the operation of all these equipment including but not limited to signals processing is done using software.   How is it useful? Consider this scenario you are behind lines somewhere in a godforsaken land, and you need to have a very re-programmable front end and flexible signals processing software that can be swapped at will. Et Voila enter SDR, change the software, and modify the front end code you got real-time signals intelligence on the field.   Apart from that in the civvie world, it's used for the analysis of radio signals be it sub-1-GHz systems and analysis and security assessment of wireless systems.   Some SDR. RTL-SDR, cheap effective for understanding stuff regarding SDR and it's accompanying software which is mostly GnuRadio Companion(GRC), L...
Read more

A very gross introduction to Electromagnetic Interference(EMI) (Originally posted on Saturday, March 21, 2020)

Image
  EMI is quite the topic for any discussion, like consider this scenario, for example, you are discussing with your old-timey school friends (who actually does that?), and you tell to one of them about your cool project that you did for measuring signal integrity in a double Molex line by modeling it's EM parameters and slowly loaded your model with all the insanity of small RF and electrical coupling that can happen inside the system.   So, ranting aside, how do we understand EMI and what EMI can actually do your systems(intentional and unintentional ones) and the badass of the questions what is EMI and how does it happen?     So what is Electromagnetic Radiation? So by science/physics,  Electromagnetic Radiation means the waves refer to waves that are actually an Electromagnetic Field that is propagating through space. So electromagnetic wave is of very broad category this includes Visible Light, X-Rays, Gamma and the regular waves that are used for communicat...
Read more

Recovering clock from Arduino.(Wlessly) (Originally published on Sunday, March 22, 2020)

Image
  So with our previous post, we got a very basic introduction to EM and EMI. This post will concentrate mostly on hands-on working into EMI and data recovery from EMI. For this I am using a simple arduino, and trying to recover some clock signals that occur in the arduino. Now with my arduino uno the clock is 16MHz, and one can observe a harmoic @ the multiples of fundamental frequencies, so a simple test with your probe at those frequencies we will have peaks in the FFT spectrum. The images are attached below. So the above attached images are the clock at the original frequency and it's odd and even harmonics, usually in MIL and AVI class equipments and instruments this type of harmonics is suppressed without mercy ruthlessly, like the same way conquistadors captures Mexico city ( https://www.pastmedicalhistory.co.uk/smallpox-and-the-conquest-of-mexico/ ), I mean it took them 3 years to erase the entire fucking race for the race and urge for gold and the possible fountain of youth...
Read more