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.

Wednesday, July 29, 2015

A PIC-based audio comb filter to remove AC mains hum

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If you have read the Modulatedlight.org page - and realized that I had something to do with its content - you will know that one of my inte...

Sunday, May 31, 2015

Adding a waterfall display to the mcHF transceiver

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Figure 1: The "Grey" waterfall mode of the mcHF self-contained SDR transceiver in "Magnify" mode which shows only 2...

1 comment:

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:

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