Friday, August 31, 2012

Problems with Lithium Iron Phosphate (LiFePO4) Batteries

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Update: For an update about what turned out to be happening with these batteries - and one possible solution - see the May 18, 2013 post, ...
16 comments:
Tuesday, August 14, 2012

A more practical capacitor-Powered Flashlight

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In an earlier post, " A mechanically-powered capacitor flashlight " I wrote about those cheap LED-based "shake-powered" ...
6 comments:
Thursday, August 2, 2012

Two repeaters, one frequency (part 2)

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In Part One I'd described why it might be advantageous to place multiple repeaters of a linked system on the same frequency.  In short...
Monday, July 23, 2012

QRP CW on the trail in the Wind River mountains of Wyoming

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Over this past week I got the chance to do something that I haven't been able to much recently:  Run QRP HF from the trail while backpac...
Monday, July 9, 2012

Solargraphs, or how to get a (sort of) color photo with black-and-white paper

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Several years ago on " Astronomy Picture of the Day " I saw an article about Solargraphs - a topic that recurs ever year or so.  ...
Monday, July 2, 2012

Two repeaters, one frequency (part 1)

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These days, finding a frequency to expand ones repeater system can be a challenge - even in "rural" parts of the country such as U...
Wednesday, June 27, 2012

Thoughts on the 2012 Field Day

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It would seem that planning pays off! That should be no surprise, provided realistic expectations, of course!  Since this was our 20th yea...
Tuesday, June 19, 2012

Field Day preparations continue

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A while ago (May 10) I wrote about Amateur Radio Field Day preparations for the Utah Amateur Radio Club ( UARC .)  As with all such plans ...
Wednesday, June 6, 2012

A suspiciously round sunspot...

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Figure 1: Venus, just appearing at 1609 MDT - in the upper-left edge of the disk. Click on the image for a larger version. I decided...
Monday, June 4, 2012

It's hiking season again!

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One of the lesser-known aspects of living in the Salt Lake City area is that we are next door to large areas of relative wilderness - that i...