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Full duplex ICs, origin of SOS, SDR round-up, comparing whips, more...
Full duplex ICs, origin of SOS, SDR round-up, comparing whips, more...
Amateur Radio Weekly
Issue 54 March 28th, 2015

Top links

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
SARnet: Florida's state-wide repeater network
SARnet utilizes the FDOT microwave system as a backbone.
Frugal Florida Fun
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.
Swapping gamma rods for better SWR
I chose a point 10cm further at the radiator as resonance will be rising.
China v. Japan
Within a few years we will see the amateur radio market flooded with quality products made in China with low prices.
Software Defined Receivers (SDRs) for the visually impaired
I can say that all the software packages delivered with SDRs have issues and challenges when it comes to using them along with a screen reader.
The SWLing Post
SDR Round-up
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.
A serious rift in the core Arduino team
One of the founding team members has gone off on his own, claiming rights to Arduino and starting a separate operation.
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 every 4 minutes on 600, 160, 80 and 40 Meters.


Comparing whip lengths
The end result is you can't beat more wire in the air.
20 meter contact with the Canary Islands
I came to find that the location I contacted was around 4,300 miles away! That is INCREDIBLE! What a great hobby we are involved in.

New products

Bluetooth microphone for mobile
Compatible with different brands of mobile radio, like Icom, Yaesu, Motorola, Kenwood and more.
Amateur Radio Weekly is curated by KK4HSX.
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Thank you for reading. 73
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