Archive for month: January, 2011

VK2ZOI’s Flower Pot Antennas

January 31, 2011 | Amateur Radio | By: Mark VandeWettering

I made a brief mention of this website a few weeks ago on Twitter, but thought I should also archive a link to it here. If you are looking for some nice VHF and/or UHF antennas, these seem pretty neat, with clear directions. They also have the benefit of being stealthy: disguised mostly as flower […]

A Neighborhood of Infinity: Quine Central

January 30, 2011 | Computer Science | By: Mark VandeWettering

Dan Piponi has a very cool article on nth degree quines on his blog. It’s much more understandable than his fascinating but mostly over-my-head postings which I read often, only to be struck by serious feelings of inadequacy. A Neighborhood of Infinity: Quine Central.

My speech bot, using

January 30, 2011 | My Projects | By: Mark VandeWettering

Okay, revamped the basic idea, now using the irclib, which in spite of a lack of documentation, actually proved to be pretty easy to use. You should be able to figure out what it does, and modify it to use your own nicks and channel.

Mini hack o’ the day: Making IRC talk…

January 29, 2011 | Amateur Radio, My Projects, Python | By: Mark VandeWettering

Okay, it’s been a while since I posted anything: I’ve been busy with travel and the holidays, and now I’m trying to get my home office/shack setup so I can pursue some other projects. It is one of those rooms that has piles of crap, some of which I haven’t seen in years, so I’m […]

MorseTweeter V 0.7 is running

January 24, 2011 | Amateur Radio, Arduino | By: Mark VandeWettering

Hajos dropped me a quick email to thank me for helping him in his Arduino project that uses an Arduino to monitor tweets using an Ethernet shield, and then translating messages that contain #morse or #cw into Morse code. Glad I could be of some minor help! Hajos Kontrapunkte: MorseTweeter V 0.7 is running.

555 Contest

January 23, 2011 | Amateur Radio, electronics | By: Mark VandeWettering

Some idle musings by hacker Jeri Ellsworth has spawned a contest for designs using the 555 timer. It’s not really my area of expertise (and designs are due by March 1, which doesn’t mesh with my current priorities) but if you have some good 555 ideas, check it out: 555 Contest: Welcome!.

Alan Yates’ Laboratory – G3XBM’s XBM80-2 Trivial 80 Metre CW Transceiver

January 23, 2011 | Amateur Radio | By: Mark VandeWettering

My “on-this-day” blog sidebar indicates that I was looking at Roger, G3XBM’s XBM80-2 transciever: a fiendishly clever low parts count CW transciever for 80m. I’ve been pondering it a bit as something I should just tack together (I think I have all the parts in my junk box) so I’ve been staring at the design […]

PA1B’s QRPP page

January 21, 2011 | Amateur Radio | By: Mark VandeWettering

Thanks to Roger, G3XBM for the link to PA1B’s QRPp page. QRP operation is operating with an output power of 5w, QRPp operation is operating with output powers down in the mw range. Bert, PA1B has some nice links to this kind of operation, and includes some designs for 20db attenuators that are easy to […]

Simulating a 40m bandpass filter in LTSpice

January 20, 2011 | Amateur Radio, electronics | By: Mark VandeWettering

A few days ago, I created a small program to compute bandpass filters using the equations from Experimental Methods in RF Design. Basically, you can pick a given inductor value, and then it solves for all the necessary capacitors. What wasn’t immediately obvious from the equations and the values that are generated was how these […]

Getting data from APRS-IS using ncat…

January 17, 2011 | Amateur Radio | By: Mark VandeWettering

I wanted to log a bunch of APRS-IS traffic for analysis, but didn’t really want to write any code (my brain hurts today), so I tried to figure out what the magic incantation is. It wasn’t necessary for me to inject any new info into the network, so it’s actually pretty easy. Type: ncat -C […]

Colossus: The secrets of Bletchley Park’s code-breaking computers

January 15, 2011 | Books I Read, Cryptography | By: Mark VandeWettering

As long time readers of my blog might remember, I’ve been fascinated by old cryptographic machines. I spent quite a bit of time tinkering around with them back when I was working on Simon Singh’s cipher challenge in his book. In particular, I spent a considerable amount of time reading up on the German Enigma […]

Morse on Arduino code, now at Arduino Playground

January 15, 2011 | Amateur Radio, My Projects | By: Mark VandeWettering

A long time ago, I wrote some code to send simple morse messages by toggling a pin of an Arduino. It could either blink an LED, or if you wired a bias resistor and transistor to it, you could use it to (say) act like a key for the FT-817. But then I lost the […]

Codec 2 good for voice, but not so much for CW

January 14, 2011 | Amateur Radio | By: Mark VandeWettering

I’ve been thinking about making a kind of “codec2 robot” that people can telnet to and get responses from, and toward that end, I thought I’d see how it did on synthetic speech, since I thought being able to use a speech synthesizer for responses would be good. I had a file generated from my […]

Batsocks – Text on TV – Introduction

January 12, 2011 | diy, electronics, Toys and Gadgets | By: Mark VandeWettering

The chaps over at the Batsocks blog sell a cute little gadget called the “Tellymate”: a nice little serial->video converter that is very, very simple. It uses a single Atmel AVR Mega, and handful of other extra components to implement a full character mapped 38×25 character display terminal which reads characters from a serial input […]

My Morse Code practice generator…

January 11, 2011 | Amateur Radio | By: Mark VandeWettering

A while ago, I worked up a simple little program that could generate both computer generated speech and Morse code at various speeds to make up some sample recordings I could use to brush up on my Morse skills. I apparently left it in a pretty broken state though: it could use some work. But […]