KA7OEI's blog

Random musings - usually on a technical (nerdy) subject - perhaps related to amateur radio and things found at ka7oei.com and modulatedlight.org. No AI is used to generate this content.

Monday, April 20, 2015

It should have not been BPL that worried us! (And using a separate receive antenna at HF)

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About 10-15 years ago - more or less - the ham magazines and press were abuzz with concerns about the impending doom that was "BPL...

Tuesday, March 10, 2015

Update on the mcHF - Adding more features (Part 2) - Implementing audio filters and fractional I/Q phase adjustments

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The front panel display of the mcHF SDR transceiver, an entirely self-contained all-mode HF transceiver based on open-source software. T...

1 comment:

Saturday, March 7, 2015

Using the "RTL.SDR" dongle (with HF port) as found on Ebay

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Some months ago I was perusing the wares of a seller on EvilBay and having decided to purchase one of those all-purpose component testers, I...

5 comments:

Friday, February 20, 2015

A "quiet" 5 volt USB car power supply

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For a previous, related article see the May, 2014 posting - "How USB car power adapters can ruin 2 meter mobile reception" - link ...

7 comments:

Friday, January 30, 2015

Updated version of the "Simple" PWM LED/Laser modulator

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A few years ago, for our friends in the Tucson area, I threw together a "simple" PWM circuit for audio modulation of high power LE...

2 comments:

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