Archive for month: September, 2007

What does RTTY look like?

September 30, 2007 | General | By: Mark VandeWettering

I recorded some in Audacity. Here you can see the spectrum display. It wheedles back and forth between two tones which are clearly visible. You can also see some considerable fading in the signal. Them’s the breaks of propagation.  If you look really closely, you can see another, weaker signal in the spectrum directly below […]

Signals from the Galapagos — HC8N

September 29, 2007 | Amateur Radio | By: Mark VandeWettering

While tinkering with my little TenTec receiver, I’ve been hearing a ton of radio teletype signals. Apparently it’s the CQWW RTTY contest this weekend, which my ham friends who are more into all this say is the biggest contest of the year. I’m more interested in actual conversation, so I was kind of bored, but […]

Pascal Implementation

September 29, 2007 | Programming Languages | By: Mark VandeWettering

Pascal is one of my least favorite languages, but reading about how compilers work and examining real code of the (actually fairly simple) system works is fun. Check out: Pascal Implementation Included here is the Pascal source of a public-domain Pascal compiler and interpreter, the P4 compiler and interpreter. It is coded entirely in Pascal, […]

TenTec 1056, in a case!

September 29, 2007 | My Projects | By: Mark VandeWettering

Well, I finally bored some holes in the case (kind of banging it up a little in the process, next time, I’ll put tape over all the edges) and mounted my radio in a real metal case. After warmup, it seems quite a bit more stable, and there is less problem with microphonics and frequency […]

J.S. Bach is probably rolling over in his grave…

September 27, 2007 | Music | By: Mark VandeWettering

Courtesy of the Good Math, Bad Math blog, check out the following video entitled: How to Write a Fugue. Oh, did I mention that it demonstrates by using a theme from Britney Spears? Warning: inexplicable blackboard cartoon of phallus may offend… well.. someone.

Pattern for My TenTec 1056

September 25, 2007 | General | By: Mark VandeWettering

Well, i was playing with the TenTec some more, and noticed that it wasn’t very mechanically stable . The VFO wanders considerably just from the capacitance of objects in its vicinity, by as much as a couple of hundred Hertz. It’s time to get this thing mounted permanently in the box I ordered for it. […]

Recording from my TenTec 1056

September 24, 2007 | General | By: Mark VandeWettering

Well, I feel stupid. After days of figuring out why I was getting an ugly feedback squeal coming everytime I tried to plug in my TenTec 1056 into something. Finally, today, on a total lark, I swapped out the cable. And… voila. Worked perfectly. So, here’s some Morse code recorded directly from my radio (recorded […]

National Talk Like a Pirate Day!

September 19, 2007 | General | By: Mark VandeWettering

It’s that most auspicious of holidays: National Talk Like a PIrate Day. All ye scurvy dogs, y’ed best be ex-agg-eratin’ yer ayes and arrs lest Davy Jones rise from the briny bottom and haul ye back to his locker. And now, a scene from the best pirate movie of all time: YouTube – Muppets Treasure […]

Ten Tec assembled, and it appears to work!

September 15, 2007 | General | By: Mark VandeWettering

Well, I decided to tack together my Ten Tec 1056 receiver kit. It took me about three hours to assemble. It was pretty straightforward to assemble, only one thing confused me: a group of three resistors which were supposed to be 220K ohms didn’t seem to be in the package, however, a quick inventory found […]

I’m the Cool Nerd King!

September 14, 2007 | General | By: Mark VandeWettering

I blame Josh for making me take this test.

YASI — Amateur Radio Interferometry

September 14, 2007 | General | By: Mark VandeWettering

Wow. This is just too cool. I got my TenTec 1056 receiver kit in the mail the other day, and was just randomly searching for links on the internet giving people’s experiences with it, when I ran across this: YASI This website describes the construction of an amateur radio interferometer using equipment that isn’t much […]

Technical Description of PSK31

September 13, 2007 | General | By: Mark VandeWettering

The best description that I’ve found of PSK31 decoding is actually in the WinPSK Technical Manual. Its remarkably informative. WinPSK Technical Manual

Part of the 40m band, viewed graphically

September 13, 2007 | General | By: Mark VandeWettering

This isn’t really all that amazing, but I thought I’d place it here anyway. As part of my experiments in decoding PSK31, I recorded a minute of the 40m band and saved it out as an uncompressed 8000 samples/second WAV file. This morning, I dusted off the fftw library, and wrote a 30 line stub […]

Linus is channelling me!

September 12, 2007 | General | By: Mark VandeWettering

Heh, I was following an innocuous link this morning, and found this little rant by Linus (yes, that linus) about the use of C instead of C++ in git. He could have been channelling me. [RFC] Convert builin-mailinfo.c to use The Better String Library. Technorati Tags: Rants and Raves, C++

Rob Pike on Newsqueak

September 11, 2007 | General | By: Mark VandeWettering

Rob Pike is an interesting guy. Formerly Bell Labs researcher, now at Google, Rob Pike has not only done more innovative and development in operating systems and programming languages than I can shake a stick at, he’s also built telescopes, appeared on Late Night with David Letterman, and was the 1980 Olympic Silver Medalist in […]