Archive for month: September, 2008

SpaceX launch reaches orbit…

September 28, 2008 | General | By: Mark VandeWettering

I didn’t get a chance to watch the online webcast, but the SpaceX launch of flight 4 of their Falcon 1 launch vehicle managed to reach earth orbit, becoming the first privately developed vehicle to do so. They don’t have video up yet, but when they do, I’ll try to link it. Congratulations to the […]

More spots from W1BW…

September 27, 2008 | Amateur Radio | By: Mark VandeWettering

Well, I got bored trying to make PSK31 QSOs amidst all the RTTY contesters, so I flipped back to playing with my WSPR daemon. First thing, I got a spot from W1BW with an SNR of -18, so I flipped over to his visual MEPT spotter, and sure enough, here was the clear “MV” beacon. […]

Visual Beacon heard by W1BW

September 25, 2008 | Amateur Radio | By: Mark VandeWettering

Bruce finally got his grabber back online, and I swiped the following image from it: In addition to the WSPR digital message, my beacon program sends this “MV” at the same time in the visual portion of the MEPT band. Thanks for you grabber Bruce, very nice. Addendum: Here’s a later grab, showing the “flying […]

Another map…

September 22, 2008 | Amateur Radio | By: Mark VandeWettering

My previous maps of WSPR spots didn’t do a great job of showing where my beacon had been heard in the U.S. Here’s another try: Again, still using GMT to draw these.

More WSPR developments…

September 20, 2008 | Amateur Radio | By: Mark VandeWettering

Well, I took a hint from Bruce, W1BW and modified my beacon to do both WSPR and visual beaconing on 30m. Below, you can see the spectrogram of about 16 minutes of recording at my station. The parts with the background nearly black are when my beacon is transmitting. You can see both the WSPR […]

World Map

September 14, 2008 | General | By: Mark VandeWettering

I’m still playing around with GMT to generate some maps. I’m not sure I’ve really got it figured out, but here is an attempt to draw a world globe with some of the great circles that connect me to the various stations that have received my WSPR beacon messages. Addendum: Robert pointed out that I […]

Progress on WSPR

September 14, 2008 | Amateur Radio | By: Mark VandeWettering

So, I’ve made some progress on teasing apart enough of the encoding of WSPR beacon messages to write a completely stand alone Python program that will generate the appropriate tone sequence to send out the callsign/grid/power message. For instance, if I type “genwspr KF6KYI CM87 27”, I get: 3, 3, 0, 2, 0, 0, 0, […]

Off to Yahoo! Hack Day

September 11, 2008 | General | By: Mark VandeWettering

Perhaps I’ll see some of you there.

WSPR: Can you hear me now?

September 8, 2008 | Amateur Radio | By: Mark VandeWettering

I haven’t had the chance to type up my notes yet on my attempts at beaconing using WSPR, but I did leave my beacon running off and on for the last week. By monitoring signal reports which appear on, I learned quite a bit about how the propagation from my location varied depending on […]

JH5RXS working contest on 7.0945Mhz

September 6, 2008 | Amateur Radio | By: Mark VandeWettering

Woke up around 4:00AM, couldn’t get back to sleep, so I went downstairs, turned on the radio and caught JH5RXS on 7.0945Mhz booming in. He’s Yukio Nishioka, in Japan and 5496 miles off. He was very, very strong: check out the recording. He kept flipping between working split and working on frequency. Addendum: Apparently this […]

Is this multipath?

September 1, 2008 | Amateur Radio | By: Mark VandeWettering

While listening to some WSPR signals (and testing my new encapsulated WSPR beacon) I heard some signals that were throbbing at about the baud rate. Instead of a more or less constant carrier, I’d here them swell and fall, swell and fall repeatedly. When I generated a spectrogram, I got this: You can see a […]