Full duplex ICs, origin of SOS, SDR round-up, comparing whips, more...
Issue 54 March 28th, 2015
New technology may double radio frequency data capacity
A team of Columbia Engineering researchers has invented a technology—full-duplex radio integrated circuits (ICs)—that can be implemented in nanoscale CMOS to enable simultaneous transmission and reception at the same frequency in a wireless radio. Columbia University
The origin of SOS
The first recorded use of SOS was Jan. 23, 1909, when a liner called the Republic and an Italian liner called the Florida collided in the dense fog while passing Nantucket. TimesDaily
New software defined radio (SDRs) products are popping up every few months these days so we thought we'd compile a big list of available SDRs as there are a few people who were bitten by the RTL-SDR bug and are now looking to upgrade. RTL-SDR.com
What is Skip Signal Fade?
With long distance propagation using ionospheric skip received signals will often fade in and out, being stronger and weaker over the course of a few seconds. What's the cause of this irregular fading? Ham Radio School
Did the eclipse affect propagation?
For the full 24 hours of 20th March, Derek G4SWY took world map screen shots of propagation as reported on WSPRnet.org every 4 minutes on 600, 160, 80 and 40 Meters. Southgate