Over the Arabian Sea

Feb 26, 2013

…here at last, we have these spectacular images - images that rained down from the sky! It's true that they are still imperfect, and rather noisy (a situation that I intend to fix soon). But, anyway, here they be recorded, before the miracle of the moment passes away…

Tags: radio, satellite, weather, electronics, project

RC Phase Shift Oscillator - Oscillation Criteria

Jan 20, 2013

Maxima is a computer algebra system. That's kinda like a calculator that can do algebra instead of just numerical calculations! I let Maxima cut through all the algebra of the RC phase shift network. Lo and behold, here we have the results, achieved almost painlessly!

Tags: electronics, maxima

CyanogenMod 9 on my HTC Explorer!

Jan 08, 2013

I often hear all this talk about how the Explorer is a "low end budget device", about how 600 MHz is just too slow, and so on. But frankly, I can only classify all this as sales talk, or perhaps uninformed talk. Ice Cream Sandwich is not in any way slow on the Explorer, all hardware works fine, and I would certainly recommend anyone with an Explorer flashing to CyanogenMod 9.

Tags: android, cyanogenmod

Frogs, Humans and the Radio

Oct 01, 2012

…in effect, SSB radio is like shouting above the din of the noise existing in the band. The noise always exists in the band, and in order to be heard, one must shout above the noise.

Tags: musing, radio

Halo around Sun in Coimbatore - August 3, 2012

Aug 12, 2012

Coimbatore witnessed a spectacular halo on August 3, 2012… Just wanted to put up a photograph of the halo by my friend Udhaya Kumar…

Tags: weather

Line Codes - Matlab / GNU Octave Code

Jul 19, 2012

I came up with the following approach to do line coding without for loops. My approach involves a bit of system theory, modulo 2 arithmetic, and sometimes just tricks founded on simple coincidence. So one is advised to be a little careful while sifting through the logic. But ultimately, the code is terse and fairly elegant.

Tags: signals, matlab, octave, software

Design of LC Oscillators - Capacitive Overload

Jun 30, 2012

If the frequency was high enough, the capacitor in the tank would draw too much current from the output of the amplifier, and the amplifier would overload killing its gain and bringing the whole system down…

Tags: electronics

Back to Classes - The Last Semester!

Jun 04, 2012

After all the awful places I've been to (Chennai tops that list), Nagercoil is quite a heavenly place. The road to Kanyakumari had good tree cover with the occasional pond and other water bodies providing good relief to the surroundings.

Tags: walk, travel

How do oscillators start up?

May 12, 2012

If you are into oscillator theory, you probably know that oscillations in an oscillator build up exponentially before hitting power supply saturation and stabilizing. Well, at least that is what the textbooks and the equations claim. But, have you ever seen it? :-)

Tags: electronics

Resistance Measurement - Common Mistakes

Apr 29, 2012

A few common and silly mistakes people might make when they are learning to use a multimeter to measure resistances…

Tags: electronics

The Site So Far

Apr 26, 2012

The plans ahead involve running my own server on a BeagleBoard with solar power. But the BeagleBoard plans are pretty long term (possibly more than a year)…

Tags: selfhosting

Throughput of Aloha Networks

Mar 26, 2012

A derivation of the mathematical expression for the throughput of an aloha network using the exponential and Poisson random distributions

Tags: math