Microwave
Two interesting things I saw when listening to the output from my microwave:
- The frequency is not stable. I assume it’s not thermally controlled.
- Probably not a good idea to use WiFi channel 6, being 2.437GHz+-11MHz and all.
Near the microwave
Some rooms away from the microwave
Separate measurement some rooms away.
How to generate the graphs
# Edit usrp_spectrum_sense.py so that it prints time.time() instead of datetime.now()
./usrp_spectrum_sense.py --dwell-delay=0.1 -A RX2 -s 8000000 --real-time 2.4e9 2.5e9 > near-microwave.txt
# Edit near-microwave to remove the stupid verbose messages from the top.
cat > microwave.plot << EOF
set view map
set size ratio .9
set object 1 rect from graph 0, graph 0 to graph 1, graph 1 back
set object 1 rect fc rgb "black" fillstyle solid 1.0
set xlabel 'Time in seconds'
set ylabel 'Frequency'
set zlabel 'dB'
set terminal epslatex color
set output "near-microwave.eps"
splot 'near-microwave.txt' using ($1-1496693552.11):((($5/1000-2400000)/1000)):4 with points pointtype 5 pointsize 3 palette linewidth 30 title 'Signal'
EOF
gnuplot microwave.plot
convert near-microwave.{eps,png}
I can’t have GNUPlot output PNG directly because it hangs.
The magic value 1496693552.11 is the first timestamp in the file.
OneLogin and Password Managers
An interesting incident this last week brings password managers back to the front of the pile—
I used to use LastPass, but moved off of their product/service when LogMeIn bought them—my previous encounters with LogMeIn have all been negative, and I have no intention of using their service again in any form. During that move, I decided it was important to make another decision about the tradeoff between an online (cloud based) password manager, or one that keeps information in a local file. The key problem with cloud based services of this kind are they paint a huge target onto your passwords. The counter argument is that such cloud based services are more likely to protect your passwords than you are, because they focus their time and energy on doing so.
First lesson: moving to a cloud based application does not mean moving to a situation where the cloud provider actually knows what you are storing, nor how to access Continue reading
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The webinar is available here.
The post Open Networking for Large-Scale Networks appeared first on rule 11 reader.
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