GPIO for Raspberry Pi, HI HI = LOL, digital voice vs. SSB, more...
Issue 76 September 5th, 2015
Top links
Pi-Go 12v power adapter for Raspberry Pi
The Pi-Go connects to the GPIO header and supplies a solid 5V at up to 3A for the Pi and its connected peripherals. Kickstarter
$50SAT falls silent
The $50SAT amateur radio spacecraft has ceased transmitting after nearly 20 months in space. AMSAT UK
New versions K1JT weak signal digital modes
Think of this mode as FSK441 slowed down to 315 baud; the bandwidth is therefore narrow enough to make the mode legal in the "CW and data" portion of the 10 meter band. amateurradio.com
Sound of a sinking ship
Listen to the Morse code interchange between a sinking cruise ship and fellow ships. hamradio.me
Open letter to Ham Radio manufacturers
Once upon a time, companies like yours developed equipment for hams entering the hobby as Novice licensees. KC4LMD
Liquid metal changes shape to tune antenna
Liquid at room temperature, these alloys have the useful property of oxidizing on contact with air and forming a skin. Hack A Day
Solar storm of 1859
Telegraph systems all over Europe and North America failed, in some cases giving telegraph operators electric shocks. Telegraph pylons threw sparks. Some telegraph operators could continue to send and receive messages despite having disconnected their power supplies. Wikipedia
Digital voice and SSB comparison
You can really notice the reduced audio bandwidth and ever present noise of SSB compared to FreeDV. This is just the start – we are gradually improving the low SNR robustness and speech quality of FreeDV. Rowetel
