Archive for month: November, 2007

Another night time satellite pass…

November 29, 2007 | Amateur Radio, My Projects | By: Mark VandeWettering

I haven’t had the time to record some of the NOAA17 passes during the day, but once night falls, I’ve managed to record a few passes. Tonight, I decided not to use my Yaesu VX-3R, but instead tried to record the pass from my old Radio Shack PRO60 scanner. While I recorded a bit less […]

I <3 Kitties

November 29, 2007 | General | By: Mark VandeWettering

Lest you all think I’m merely a robotic automata without any sense of sentimentality or soul, I present the following. Thanks Alex for the link.

Night NOAA17 pass…

November 28, 2007 | Amateur Radio, My Projects | By: Mark VandeWettering

A bit of image processing with gimp yielded the following on a night time pass.  It wasn’t particularly good with respect to noise:  on the night passes the contrast is pretty low , so you get difficulties  when you try to extract good images.  Still, I’m not displeased…

Best Satellite DX so far…

November 28, 2007 | Amateur Radio | By: Mark VandeWettering

I was monitoring a routine pass of AO-51 this morning, just listening to some rag chewing, not really diving in myself, until we heard XF4YW calling. One of the regulars identified him as a rare DX, so we all tried to work him from DK48. I had no idea where DK48 was, or that XF4YW […]

David Taylor’s Weather Satellites

November 27, 2007 | General | By: Mark VandeWettering

Lots and lots of good information, rather Euro-centric (they seem to have lots more fun with satellites than we do here in the states) but I’m impressed by the depth and breadth of the information contained therein. Found it while searching for information about a helical cavity filter. Weather Satellites Addendum: You can read about […]

More weather satellite passes…

November 27, 2007 | Amateur Radio, Amateur Science | By: Mark VandeWettering

Well, I’ve been experimenting a bit more with some weather satellite reception, and on the off chance that anyone cares, I thought I’d write down some of what I learned. Last night (after dark) I decided to record an NOAA-17 pass. This time, I used my Yaesu VX-3R, which has a wideband FM setting, and […]

First attempt at receiving and decoding weather satellites…

November 25, 2007 | Amateur Radio, Amateur Science, My Projects | By: Mark VandeWettering

Okay, this isn’t that impressive, but let me explain. Larger version of the same… I recorded about 4.5 minutes of audio from one of the weather satellites, using my small pocket recorder and a Kenwood TH-D7A. In most respects, I shouldn’t expect anything good to happen. I’m using a cheap little voice recorder. I’m using […]

$25 TNC

November 24, 2007 | Amateur Radio | By: Mark VandeWettering

Terminal node controllers are the “classic” approach to doing packet radio. They are basically dedicated modems that are used to implement a set of features that allow you to send and receive AX.25 formatted frames over amateur radio. The thing is: they are getting harder to find. My TH-D7a has a fairly sophisticated one built […]


November 21, 2007 | Amateur Radio | By: Mark VandeWettering

I mostly just wander out and wave my antenna around when I work satellites. Someday, I might want an automated system, and this can be built for less than a hundred bucks with stuff you can get from Radio Shack. Worth archiving. A PRACTICAL ROTATOR SYSTEM (APRS)®

Decoding APT weather satellites

November 21, 2007 | My Projects | By: Mark VandeWettering

With all the satellite mucking around I’ve been doing, I’ve been thinking about the possibility of building a little setup to receive weather satellite information directly from the weather satellites that are in polar orbit. They broadcast mostly around 137Mhz, and use an AM modulated subcarrier to send information via FM. I haven’t got a […]

Asterisk on an FPGA

November 20, 2007 | Asterisk and VOIP | By: Mark VandeWettering

From the Beer, Coffee, and a little DSP » Blog Archive » Asterisk on an FPGA Over the past couple of years a few people have suggested running Asterisk on an FPGA using an embedded processor core. I must admit I had always assumed that the processor would be too slow to be useful, certainly […]

Filed under the heading “Daily Crackpot”….

November 20, 2007 | General | By: Mark VandeWettering

Try reading some of this drivel. Rebel Science News

First real qso via GO-32…

November 20, 2007 | Amateur Radio | By: Mark VandeWettering

I was experimenting with APRS messaging via GO-32 this morning, after being simply overrun by Mexican hams earlier in the morning on AO-51. W7KKE runs a GO-32 SatGate in Lincoln City, Oregon (a place I’ve visited many times) and was apparently listening when I messaged him this morning via my TH-D7. I wasn’t using a […]

ANDE deorbit website…

November 19, 2007 | General | By: Mark VandeWettering

In about a month, the ANDE satellite (otherwise known as NO-61) will deorbit. Last night I was out hunting for it, and heard a single AFSK packet which didn’t decode properly. It’s pretty hard to bounce something off it since it only wakes up for 1s out of ever 15s looking for packets. This satellite […]

Digipeated APRS Fix via the ISS

November 19, 2007 | Amateur Radio | By: Mark VandeWettering

I looked at, and noted that the ISS packet radio feed appeared to be back up. We had a 15 degree pass to the west (the most favorable direction, toward the east I have a S5 noise source), so I went out and waved my antenna around, and got the following packets digipeated: From […]