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Juha Vierinen
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Building you own passive radar on a shoestring
What is a passive radar? To start off with results, here is an animation of a passive radar measurement of airplanes and meteors I made using a passive radar system that I built with a few simple easily available pieces of hardware: two $8 RTL software defi...

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Plasma lines at Arecibo
25 MHz wide plasma line profile at Arecibo.  A while ago, Thomas covered the Arecibo radar school. During the school, a ittle bit of data taking took place. Between his lectures, Phil Erickson ran data collection with our 25 MHz digital receiver, in anticip...

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Software defined radio wide band wide beam riometer
During my visit to Finland a few weeks ago, I setup two computers with two different development frontends to test my idea of using a USRP N200 and a single LOFAR LBA antenna as a riometer. The advantage of using a wide band for riometry is threefold: More ...

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Perfect Incoherent scatter radar jammer
On November 27th, somebody stepped on our band. At first I thought that there must be something wrong with the new radar echo deconvolution program that I have been developing. But a month ago the same program worked perfectly, and no major changes were mad...

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Snow storm
We just had the first "snow storm" for this year, which gave us 20-30 cm of snow overnight. In the morning, we had the first chance to get a workout shoveling our yard and driveway.

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1.2e201 + 9.1e201
The boys have learned basic math. It then occured that summation of very large integers precisely is something that even computers can't do that easily. Standard processors have 64 bit integers, allowing only numbers up to 1.8e19 to be solved. For fun, I wr...

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Ecosystem in a bottle
A while back I saw an ecosystem in a bottle at the doctor's office while taking the kids for their routine checkup. At home I googled about these things a bit more and became fascinated with the idea of a completely closed up ecosystem.  I read that this wo...

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Boston Museum of Science
Last weekend we went again to the Museum of Science. Last summer, Tom said they had purchased the membership, which allowed them to visit any time they wanted. I didn't think it was a good idea at the time, but now with winter approaching, the idea of a fre...
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