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 15, 2019

Applying outboard AGC and filtering to RTL-SDR dongles to maximize usable dynamic range on HF

An AGC system for RTL-SDR "wideband" receivers operating in "Direct...

Monday, March 11, 2019

Quieting an insanely (RFI) noisy LED floodlight

A friend of mine recently installed some inexpensive Chinese-made floodlights to illuminate his backyard, but was dismayed to discover that ...

Thursday, February 14, 2019

A 2 meter and 222 MHz low-pass filter for the SocoTran ST-7900D

In an earlier post (link) I described a "hilariously bad" radio - the Socotran ST-7900D (a.k.a. the QYT "KT-7900D") . ...

Friday, February 1, 2019

A hiliariously bad multi-band radio: The SocoTran ST-7900D

Spoiler: DO NOT get one of these radios! If you have one, don't use it! (If you are of the "tl;dr" type, scroll down ...

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