Category Archives: Ham Radio

IRIS Transmitter V1.2

Posted on 2014-06-07 by Nigel VH

I’ve been working on creating a new version of my IRIS Transmitter boards, which I use for high altitude balloon trackers. This was somewhat more of a re-architechture from the 1.0 and 1.1 revisions. Revision 1.2 brings a number of … Continue reading →

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Black Rock 2014

Posted on 2014-05-11 by Nigel VH

As some of you may know, each year for the past several, I’ve been fortunate enough to be able to volunteer my time and expertise to a couple of classes at the University of Washington, one of which makes a … Continue reading →

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IRIS Transmitter Cold Test

Posted on 2013-05-26 by Nigel VH

I’m going to be flying one of my transmitters soon on a weather balloon, so I wanted to make sure it would work properly at the cold temperatures normally experienced there. So I went over to the local Fred Meyer … Continue reading →

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Black Rock 2013

Posted on 2013-04-04 by Nigel VH

As you know, I volunteer with a couple classes at the University of Washington, helping to create telemetry systems for balloons and rockets. The rocketry class in particular generally has two endeavors to launch their rockets. One in the fall … Continue reading →

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Lat/Long to Grid Square Conversion

Posted on 2013-03-22 by Nigel VH

In the process of making my WSPR beacon, I wanted the system to both use the time from GPS to sync the transmissions accordingly, but also have the system be portable in that it would generate the needed grid square … Continue reading →

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