April 2021

Price: $3.00

Portable Power for Your Radios

By Thomas Witherspoon K4SWL

     Having spent a serious amount of time pursuing amateur radio in the field with over 80 Parks on the Air (POTA) activations, Thomas has learned a lot about portable power supplies. From rechargeable AA batteries to LiFePo4LFPs, readers get a tutorial on the best way to power their rigs in the field.


TSM Reviews: An SDR Enters the World of Scanners: BlueTail P25RX

By Larry Van Horn N5FPW

     This is an unconventional radio capable of monitoring conventional public service FM analog signals, APCO P25 Phase I and II, DMR and NXDN48 transmissions in frequency ranges from 130-245, 256-327, 380-490, 763-824, 849-869 and 894-960 MHz. Larry puts this receiver into use both on the desktop and on the road.


The World of Amateur Radio Astronomy

By Stan Nelson KB5VL

     Radio astronomy is a relatively new discipline in modern science that has its roots in amateur radio from the 1930s. Stan chronicles the tradition of amateurs in radio astronomy today with the help of low-cost receivers and computers dedicated to scanning the skies for near space and outer space action.


Shipborne Communications from Spark Gap to Satellite

By Guy McCullough K4ICP

     Radio communications from ship-to-ship and ship-to-shore was one of the first applications of the technology that emerged early in the 20th Century. Guy takes us on a tour of maritime monitoring from its earliest days of Morse messaging via spark gap to the present with global satellite communications.


FRS and GMRS: Yesterday, Today and Tomorrow

By Mark Haverstock K8MSH

     Since the late 1930s there has been a push for a license-free class of low-cost, low-powered radios that anyone could use to communicate with family and friends. It took the FCC several decades to iron out the details and today the Family Radio Service and General Mobile Radio Service fills the bill. Mark gives us an update.


KiwiSDR Shortwave Listening Network

By Bob Grove W8JHD

     Through the generosity and technical know-how of hundreds of hams and shortwave listeners around the world, there is a network of HF radios that anyone with a computer connection can access for free that lets you tune in the world from another listening post somewhere else in the world. Bob explains how it works.


WWII Radio Propaganda Part 3:

The Voices Behind ‘Axis Sally’

By Scott A. Caldwell

     This month Scott chronicles the lives of two women who gained notoriety during WWII for their vitriolic international broadcasts designed to demoralize Allied troops. It did not turn out well for either.


Scanning America

By Dan Veeneman

800 MHz Rebanding


Federal Wavelengths

By Chris Parris

Finding Federal Frequencies



By Larry Van Horn N5FPW

Monitoring UHF Military Satellites


Utility Planet

By Hugh Stegman

Cuban “Numbers” Revival Continues


Shortwave Utility Logs

By Mike Chace-Ortiz and Hugh Stegman


VHF and Above

By Joe Lynch N6CL

Amateur Radio Gets a Partial Reprieve on 3.5 GHz


Digitally Speaking

By Cory GB Sickles WA3UVV

Spring into Action!


Amateur Radio Insights

By Kirk Kleinschmidt NT0Z

Whither QSLing?


Radio 101

By Ken Reitz KS4ZR

Listening to Baseball on the Radio 2021


The World of Shortwave Listening

By Rob Wagner VK3BVW

Antennas…BIG Antennas!


The Shortwave Listener

By Fred Waterer

WWCR, WRMI and BBC Fare for April


Adventures in Radio Restoration

By Rich Post KB8TAD

The Universal Modulator: WRL Globe UM-1


Antenna Connections

By Robert Gulley K4PKM

Harmonic Antennas

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