Okay, so I’ve been playing around with generating various kinds of visual signals on the MEPT subband on 30m. That’s the 100hz wide band just above 10.140Mhz, and it’s fun, because there are a number of “grabbers” which have the spectrum displays from their radio receivers available on the web. But there is a minor […]
Archive for month: August, 2008
Yesterday, I took the wife and the future daughter-in-law to Travis AFB for their airshow. It was a blast. Lots of cool planes, culminating in a nice show by the Air Force Thunderbirds. I snapped a lot of photos, this one probably being the best.
Well, inspired by Bruce’s “Flying W” beacon, and realizing that it was a pretty nice and efficient way to send out an easily identified beacon signal, I coded up a really simple little program to generate the “MV” beacon signal (my initials). I then powered on the FT-817, while I didn’t see anything registered on […]
I’ve been trying to monitor (intermittently) some of the beacon activity on 30m. This morning, I managed to capture Amateur Radio Station W1BW, who is transmitting a “W” shaped carrier every few minutes on 10.140050. Here’s my spectrogram from this morning’s recording. The first one seems to be the strongest, but if you look carefully […]
YouTube – Cute-1.7 + APD II Earth Movie From the amsat-bb: We release the movie taken by Cute-1.7 +APD II. It was taken above Japan. The movie is very short. But, it is the 1st movie taken by 3 kg satellite in the world. From this movie, we could confirm that the satellite rotates at […]
Well, I was bored, and it was getting close to midnight. There was nothing really going on on any of the amateur radio bands, so I got to thinking. Light travels about 186,000 miles per second, or about 186 miles per ms. On 10Mhz, NIST broadcasts a standard time signal from stations in Colorado, and […]
Ordered a new Collins 500hz filter for my FT-817 from W4RT, and installed it (really simple, remove some screws, disconnect speaker, plug in the module in the obvious place, reconnect speaker and screws and you are done). It really does help with cw and digital. As an example, this morning I tuned down around 7.039 […]
Somebody is sending out a CQ. I just noticed it at the end of a recording I did, but he’s retransmitting again now. I’ll let the recording go for a while, then try to figure out who it is. Until then: Addendum: It was WB5FKC.
Courtesy of BibliOdyssey: Early Microscopes, a collection of very cool etchings showing, well, early microscopes.
Well, I woke up this morning, kind of bleary eyed, and decided to see if I could reach any of the other QRSS grabbers during the morning hours. VE1VDM’s grabber is apparently only receiving his transmit signal, but W1BW was up and running… There I am, drifting up in frequency across the bottom. Copy is […]
Well, I was experimenting a bit. I dusted off my QRSS3 iTunes beacon idea, and set it going. VE1VDM had his “big ears” grabber going, so I started watching it. He’s in grid FN85ki, which is roughly a 3000 mile path. To help assure success, I was sending 5 watts (horrendous, I know, but I […]
Hellschreiber is a method of sending text over radio. It basically is a kind of primitive fax machine: it sends each character as a 7×14 matrix of dots. If the receiver hears a signal, it plots a dot, otherwise it plots a space. Each character is scanned left to right, bottom to top, and are […]
Well, I’m sitting at The Standard (a frankly far too chic hotel for a forty something computer geek like myself), it’s not quite 7 A.M. and I spent my first day at SIGGRAPH. I’m hear mostly for the benefit of recruiting: sitting in the booth, answering questions and showing up at our Pixar User’s Group […]
I was monitoring the 30m PSK31 subband this evening, and it seemed to be fairly quiet and also picking up some pretty good DX. I heard WP3UX and WP4U chatting with ZL4AS. The first two stations are in Puerto Rico, about 3600 miles away, and the ZL is about 7000 miles away. I think that […]
Sven Grahn’s Space Tracking Notes talks about his efforts in using radio to track satellites. There is all sorts of really good stuff in here, a lot of it having to do with tracking the secret launches of Russian satellites during the Cold War. Very, very neat stuff.