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Motion sensing with audio, hidden CW, emergency data network, more...
Motion sensing with audio, hidden CW, emergency data network, more...
Amateur Radio Weekly
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.
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.
FCC Enforcement Bureau field resources poised to shrink
The Bureau plans to ask the full Commission to cut two-thirds of its field offices and eliminate nearly one-half of its field agents.
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.
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.
X-class solar flare causes radio blackout
Good news? There may be some HF band openings in the wake of this flare.
The SWLing Post
Single Sideband on 2 Meters: The other VHF mode
Using SSB instead of FM can be equivalent to having a beam antenna with 10 dB of gain, just by changing modulation types.
Ham Radio School
SOTA Mountain Goat award
After 2 years and 2 days my point total is now 1,007, hallelujah!
Fldigi ported to Android
The multimode digital software package that many have used for years on the desktop, has now been ported to Android.


Amateur Radio Weekly is curated by KK4HSX.
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