April QST

An Improved DSP Audio Filter

Grant Zehr, AA9LC, and Scott Zehr, K9GKC

The design of this digital signal processing filter uses an Arduino Nano and offers a flexible user interface with an OLED display. The filter also stores adjustable parameters for seven different profiles. Read QST

March/April On the Air

Avoiding Problems in the RF Chain

Devere “Dee” Logan, W1HEO

Achieving your station’s maximum efficiency requires close attention to each link in the RF (radio frequency) chain from the radio to the antenna. Poor installation and maintenance can result in major problems, from attenuated signals to total station failure. This article offers advice on how to strengthen each link in your station’s RF chain. Read On the Air

30 THz — It’s Radio, But Not As You Know It

Barry Chambers, G8AGN

Of particular interest to radio amateurs is the so-called Long Wavelength Infrared (LWIR) band, corresponding to frequencies around 30 THz and wavelengths around 0.01 mm. There is a lot to explore using simple to build and operate 30 THz equipment. Read QEX

Next-Gen Contesters: A Look Back at the First Year of the YOTA Contest Series

Neil Rapp, WB9VPG

The YOTA Contest series began in 2021, partly in response to the COVID-19 pandemic, as operators couldn’t visit large contesting stations as often. The IARU Region 1 Youth Working Group organized the series, so Neil, WB9VPG, asked the leader of the group, Philipp Springer, DK6SP, to comment on how things went. Read NCJ

Celebrate NCJ’s 50th Year of Publication

To celebrate the 50th year of publication for ARRL’s National Contest Journal, ARRL has commissioned a limited-edition challenge coin as a gift to all 2022 subscribers — new and renewing! The coin features a stunning numeral 50 with the ARRL and NCJ logos, and the journal’s founding year. A great memento for any contester or ARRL collector. Subscribe Now

Podcasts

Eclectic Tech — Episode 55

This episode of ARRL’s Eclectic Tech podcast includes a conversation with Dave Slotter, W3DJS, about HamPi, a free suite of amateur radio software for the Raspberry Pi microcomputer. Listen March 10

On the Air — Episode 27

The upcoming episode of the On the Air podcast is a guided tour of the 10-meter band. Open your March/April issue to The Big Picture: The 10-Meter Band on page 10 to follow along with a full-page illustration of what’s on the band and where. Listen March 10

ARRL Podcast Survey: Your input will help us produce better shows and cover topics you want to learn about in 2022. Take Survey Now

Membership

Take advantage of a special membership promotion we are running throughout 2022. Renew for 3 years and get a free limited-edition Gil cartoon coffee mug with code GIL2. This offer applies to 3-year full memberships in the US only. Drink up more years of membership today!

Build an End-Fed Half-Wave Antenna

Get ready to drill, fasten, and solder with this four-band End-Fed Half-Wave Antenna Kit. This kit is perfect for everyone from beginners to experts. Ease of construction is key with versatility in a variety of installation configurations (sloping, horizontal, L, etc.), no tuner is needed, and this one works on 4 bands: 10, 15, 20, and 40 meters. Most everything goes into the included weather-proof box and is ready to be built and deployed by you! Order Now

2022 Spectrum Defense Mugs and Pins

The fourth set of Spectrum Defense mugs and pins in the 5-year series are now available. Help fund the protection of amateur radio operating privileges with a gift to the Spectrum Defense Fund. Gifts of $50 or more will receive a 2022 Spectrum Defense pin. Gifts of $100 or more will receive both a Spectrum Defense pin and mug. Quantities are limited. Donate Today

Join ARRL at the QSO Today Virtual Ham Expo

Visit the ARRL booth at the QSO Today Virtual Ham Expo, March 12-13, 2022. ARRL Member Services Manager Yvette Vinci, KC1AIM, and Membership Marketing Manager Matt Caruso will be available to text and video chat at the ARRL Virtual Booth on Saturday, March 12 from 9 AM – 5 PM. Tickets to the virtual expo include an entry for the live 2-day period and 30-day on-demand period. Learn More

Conventions & On-Air Events

Rookie Roundup SSB | April 10, 2022

Raleigh Hamfest hosting the ARRL Roanoke Division Convention

Raleigh, North Carolina | April 16, 2022

Dayton Hamvention® and featuring ARRL EXPO

Xenia, Ohio | May 20-22, 2022

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