April 2019

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TSM Reviews: Uniden SDS200 Base/mobile Scanner

By Larry Van Horn N5FPW

On the heels of the release of the SDS100 handheld scanner in the first quarter of 2018, Uniden announced the release of the SDS200 base/mobile scanner in January 2019. Like the SDS100, the SDS200 is a True I/Q™ scanner, that incorporates software defined radio technology to provide improved digital performance in even the most challenging RF environments.

What sets the SDS100/200 series scanners apart from any others in the marketplace is their ability to handle simulcast reception issues while monitoring certain P25 trunk radio systems. Larry takes a look at this talented scanner in part two of “The Good, the Bad and the Ugly.”


Bringing Ham Flavored STEM into the Classroom 

By Martha Muir W4MSA

Members of the North Fulton Amateur Radio League (NFARL) spent a week working with some seventh and eighth grade students at Mill Springs Academy in Alpharetta, Georgia, teaching them some fundamental concepts of electronics with direct applications related to amateur radio. This is part of a program at Mill Springs called Winter Learning, where students get to take a weeklong seminar on a specialty topic. This specialty topic, “Electricity is Magnetic!” was organized by NFARL members, Chuck Catledge AE4CW and Jim Stafford W4QO. Martha tells us what happens when Science Technology Engineering and Mathematics meets amateur radio in the classroom.


Portable Airband Transceiver Overview

By Cory GB Sickles WA3UVV

The VHF spectrum is full of FM analog and various forms of digital voice and data communications, but also found there are communications based on a technology that goes back a century and then some—AM or Amplitude Modulation. This is the type of signaling shared by commercial and general aviation pilots, as well as the men and women on the ground that communicate with them to keep everyone safe and moving efficiently. If you live near an airport of any size you may have wondered about listening in. Cory takes a look at listening to this small but important slice of the spectrum.


Othernet’s Free Satellite Service Continues to Evolve

By Kenneth Barbi

The free one-way digital satellite service, known as Othernet, has been evolving since its debut in 2017. Othernet had operated first on Ku-band and then on L-band, and though coverage was worldwide, the cost was astronomical, and the throughput was limited to 20 MB per day. By reconfiguring their operation back to Ku-band, costs came down and throughput increased to more than 1 GB per day. But the change required different hardware. Kenneth updates the latest on this non-profit information service.


Scanning America

Dan Veeneman

TETRA System; FCC Actions; Clark County, Ohio


Federal Wavelengths

By Chris Parris

Federal Radios Fading Away?


Milcom Monitoring

By Larry Van Horn N5FPW

Monitoring the Pakistan-India Navies


Utility Planet

By Hugh Stegman

North Korean “Numbers” Messages Continue


Shortwave Utility Logs

By Mike Chace-Ortiz and Hugh Stegman


VHF and Above

By Joe Lynch N6CL

ISS Astronauts are Calling CQ Students


Digitally Speaking

By Cory GB Sickles WA3UVV

Split P Soup


Amateur Radio Insights

By Kirk Kleinschmidt NT0Z

Down to the Wire


Radio 101

By Ken Reitz KS4ZR

ATSC3, 4K and 5G: What Next?


Radio Propagation

By Tomas Hood NW7US

A New Cycle is Born


The World of Shortwave Listening

By Rob Wagner VK3BVW

Hunting Shortwave Schedule Changes


The Shortwave Listener

By Fred Waterer

Slovakia on Shortwave, RNZI, Plus BBC Programming this Month

Maritime Monitoring

By Ron Walsh VE3GO

Winter Winds, Spring Melt and Radio


Adventures in Radio Restoration

By Rich Post KB8TAD

Still a Thrill: The National SW3 “Thrill Box”


Antenna Connections

By Dan Farber AC0LW

Well Grounded: A Down to Earth Station

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