Motion sensing with audio, hidden CW, emergency data network, more...
Issue 52 March 14th, 2015
Top links
Motion sensing using the doppler effect
In order to measure the doppler effect for motion detection on a conventional computer, what you can do is send out a sinusoid at some known (inaudible) frequency, say, 20 kHz. Daniel Rapp
Hidden CW in Tubular Bells recording
This was caused by a powerful VLF station located next to the recording studio, which interfered with the recording equipment. Because the signal is very weak nobody ever noticed it — until now. PD0AC
FreeDV and Codec 2 2015 Road Map
VHF FreeDV mode(s) that demonstrates a TDMA repeater in a 5kHz channel, diversity reception, high bit rate audio/data, and operation at 10dB less C/No than analog FM or 1st generation DV systems. Rowetel
Amateur Radio Emergency Data Network
The AREDN project mission is to provide the Amateur Radio community with a quality solution for supporting the needs of high speed data in the Amateur Radio emergency communications field. AREDN
Activation of North Korea
3Z9DX explains he has received a further letter from authorities in Pyongyang inviting him to a final meeting to discuss [and for he to accept] rules by the North Korean military and the relevant telecommunications department. DX World
20-year-old military satellite explodes in orbit
A 20-year-old military weather satellite apparently exploded in orbit Feb. 3 following what the U.S. Air Force described as a sudden temperature spike. SpaceNews
Fldigi ported to Android
The multimode digital software package that many have used for years on the desktop, has now been ported to Android. AmateurRadio.com
