Monday, July 26, 2021

When off is not off, or "why is my amplifier pulling 30mA when it's off?"

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 I have a little shed out the back with a 100W solar panel on it and a 13.8v battery. Right now it's just running a Raspberry Pi 2 power...
Thursday, July 22, 2021

On calibrating up a ubitx, or "why the hell is this so complicated"

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 I've built a few of ubitx/bitx40 radios over the last couple years. I built one of each for me, and a couple for other hams. The bigges...
Monday, December 28, 2020

Repairing and bootstrapping an IBM PC/AT 5170, Part 3

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So! In Parts 1 and 2 I covered getting this old thing cleaned up, getting it booting, hacking together a boot floppy disc and getting a work...
Thursday, December 17, 2020

Repairing and bootstrapping an IBM 5170 PC/AT, part 2

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Ok, so now it runs. But, what did it take to get here? First up - I'm chasing down a replacement fusable PROM and I'll likely have t...
Wednesday, December 16, 2020

Repairing and bootstrapping an IBM 5170 PC/AT, part 1

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 I bought an IBM PC/AT 5170 a few years ago for a Hackerdojo project that didn't end up going anywhere. So, I have a PC/AT with: 8MHz 80...
Friday, July 24, 2020

RFI from crappy electronics, or "how's this sold in the US?"

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I picked up a cheap charging cable for my Baofeng UV-9S. ( https://www.amazon.com/gp/product/B07TSDSQ4Z/ ). It .. well, it works. But it m...
Wednesday, July 15, 2020

Fixing up ath_rate_sample to actually work well with 11n

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Way back in 2011 when I was working on FreeBSD's Atheros 802.11n support I needed to go and teach some rate control code about 802.11n M...
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