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22 October, 2016

What it takes to make the AP510 APRS tracker useful

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This small VHF APRS tracker can easily be improved with some simple measures: The 1 Watt of output power is often too little to reach th...
16 June, 2016

DIY Powerpole voltage and current meters

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Powerpole voltage and current monitoring is quite nice to have. One can buy commercial meters, but due to the availability of nice and che...
11 April, 2016

Improved GPS reception with a ground plane

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My poor-man's 10 MHz reference based on the Ublox Neo-7M GPS module didn't always receive GPS satellites. Since I rely on receptio...
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27 February, 2016

Teeth marks in the K3

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DX-expeditions love their K3s. And I love my K3. But look closely at the MENU button and you will find the marks of someone who literally ...
20 February, 2016

Series capacitors that failed according to the book

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0.33 uF X2 capacitors which measured only 0.097, 0.1, and 0.118 uF. Many devices now use a capacitor power supply thus saving the space...
24 January, 2016

Latest firmware for AP510 APRS tracker is superb

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I got my AP510 APRS tracker a little more than a year ago . It kind of worked, but not very well in my car. But after the tracker got a ...
13 January, 2016

Magnetospherically ducted echoes in the San Francisco area

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On 7. November 2015, several radio amateurs in northern California heard echoes in the 80 meter band. I was made aware of it by Jack, W6FB i...
11 December, 2015

Finally got rid of the pirated USB chips for the UV-5R and the AP510

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Both the Baofeng UV-5R handheld UHF/VHF radio and the Sainsonic AP510 APRS tracker come with interface cables with pirated chips. These a...