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  • The Winners of the three Retevis radios 16 Anniversary giveaway are announced!! Click Here to find out if you won!

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ADDED UPGRADE ITS ECHO OH YEA ITS READY TO MAKE'EM MAD

QK4 Mobile - Android & iOS Phones & Tablets - The most advanced K4 Remote app free!

In an earlier post, I mentioned that I had released QK4 Android mobile, primarily targeting phones. The app is now officially "QK4 Mobile" and supports both phone and tablet layouts for both Android & iOS. Best of all, it's open source and free!

QK4-Mobile-v0.8.0-Console.png



The app now supports FT8/FT4 with a built-in app, which includes ADIF logging:

QK4-Mobile-v1.0.5-FT4-Confirmed-QSO.png


It supports Midi CW devices such as the N6ARA TinyMidi:
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And the Halikey Midi...
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Retevis 16th Anniversary - 3 Ailunce HA2 Radios!

Retevis is celebrating their 16th Anniversary by giving away THREE Retevis Ailunce HA2 2m/440 APRS Radios!

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Link to HA2 on Amazon
That's right - THREE HA2's are being given away to WorldwideDX members! The contest rules are the same as the last drawing:

The Retevis HA2 is a 2M/440 radio with GNSS and APRS capabilities. It has an IP67 rating that can take just about whatever abuse you can throw at it. If you've never tried APRS and have been waiting for a reason to use it - this is your opportunity!

How to win this radio:
  • The giveaway is open to all active members of worldwidedx.com. "Active" means, you must have a minimum of 5 posts in this community before the drawing. The posts can be any...
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Ailunce HA2 APRS Functionality Revisited

When I first reviewed the Retevis Ailunce HA2, APRS was one of the radio's most interesting features, but it was also clearly unfinished. The radio could transmit position beacons and display received stations, but proper APRS messaging was missing. Incoming messages were treated more like packet comments, there was no way to compose a message, and Bluetooth access to the internal TNC was still a promised future feature.

The good news is that Retevis has now released new firmware that addresses most, if not all, of the missing APRS messaging functionality. I helped test several versions of this firmware and provided feedback about what the APRS implementation needed to do. After using the released version, I can report that all of the new messaging features described below work...
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QK4 Android Mobile app: remote for the Elecraft K4 on your phone

I’m excited to share QK4 Android Mobile, a new Android phone-focused remote application for the Elecraft K4/K4D.

Source code and the Android releases are available at:
https://github.com/worldwidedx/QK4-Android

QK4 Mobile is a GPL derivative of Mike Garcia KF5O’s excellent QK4 project. The goal was not to reinvent the radio-control plumbing that QK4 already proved on Windows and macOS. Instead, we preserved the known-good K4 connection, CAT control, panadapter streaming, RX audio, and microphone TX architecture—and built a genuinely usable touch-first operating interface around it.

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The challenge was that a K4 is a very capable radio with a lot of controls, and the regular QK4 assumes a large screen, keyboard, mouse wheel, hover behavior, and...
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Radioddity GS‑10B Pro: Imperfect, Unrefined, and Surprisingly Good When You Use It Right

General Behavior and Everyday Use​

The Radioddy GS‑10B Pro is one of those radios that tries to cover a lot of territory. It’s a VHF/UHF handheld, but it also dips into HF, AM broadcast, shortwave, airband, and general wideband receive. It’s Radioddity’s attempt at making a “do‑everything” handheld for people who like to poke around the spectrum. Whether that’s good or bad depends on how you use it, because this radio rewards the operator who takes a little time to understand what it can and can’t do.

On VHF/UHF, the GS‑10B Pro behaves exactly like a budget wideband handheld should. It hears repeaters and simplex without drama. It’s not the most robust front end, but it’s not fragile either. Transmit audio is clean enough for normal use, FM audio is clear, scan speed is average...
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Retevis RA89G: A Modern Take on the GMRS Handheld

The Retevis RA89G is the latest entry in Retevis’ GMRS lineup, and it brings a mix of modern features, solid ergonomics, and a surprisingly polished user experience. After spending time with it, programming it, and putting it through real‑world use, the RA89G ends up being a radio that does a lot right — as long as you understand what it is and what it isn’t.

Build Quality and Design​

The RA89G feels rugged in the hand. The chassis is stiff, the controls are firm, and nothing about it feels cheap or flimsy. Retevis clearly wanted this radio to feel substantial, and it does.

But let’s be clear: this radio has no splash or water resistance of any type. There’s no IP rating, and based on my teardown of the RA89R — the RA89G’s sister radio — there are no seals, no gaskets, and...
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July 4th, 2026 Independence Day Retevis RA89R Giveaway!

Retevis is celebrating the launch of their new RA89R 2 meter / 70cm handheld radio with ANOTHER giveaway on July 4th, 2026!

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Link to RA89R on Amazon
That's right - ANOTHER RA89R giveaway! The contest rules are the same as the last Father's Day drawing:

The Retevis RA89R is a refined version of the very popular RA89. It has a slightly larger screen with larger fonts for easier visibility. The menu system has been updated and refined to make it easier to use. The biggest new features include AM air band reception and built-in Crossband Repeat capability! There are a few key other differences with the new RA89R: It is IP54 radio instead of IP68 and max power is 5 watts...
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New Retevis RA89R Radio, New Father's Day 2026 Giveaway!

Retevis is celebrating the launch of their new RA89R 2 meter / 70cm handheld radio with a Father's Day giveaway for 2026!

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Link to RA89R on Amazon

Details of the giveaway are below.

The Retevis RA89R is a refined version of the very popular RA89. It has a slightly larger screen with larger fonts for easier visibility. The menu system has been updated and refined to make it easier to use. The biggest new features include AM air band reception and built-in Crossband Repeat capability! There are a few key other differences with the new RA89R: It is IP54 radio instead of IP68 and max power is 5 watts. However, the RA89 can be programmed using bluetooth with the Retevis app on your phone, or with a USB-C cable using the PC app. It also...
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Radioddity Tomolink Review: A Self‑Managed POC Radio With Three Years of Included Service

Push‑to‑Talk over Cellular (POC) radios occupy a strange middle ground in the communications world. They’re not traditional RF radios, and they’re not smartphones — but they borrow elements from both. Most POC systems are built for enterprise fleets and require dealer provisioning, recurring service fees, and management portals that feel like they were designed for organizations, not individuals. Radioddity’s Tomolink takes a very different approach. After testing four units across the U.S. and even internationally, it’s clear that Radioddity is trying to make POC accessible without pretending these devices replace RF when the grid goes down.

Setup and Group Management: No Dealer Portal
I started by creating my own talk group directly from the Super‑PTT phone app. Pairing all...
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Elecraft K4 new SSNR vs older LMS NR with external BHI module

For those that don't follow Elecraft product announcements, last week a public beta firmware was released that contains the much anticipated Spectral Subtraction Noise Reduction, available for usage in all modes. The older Least Mean Squared NR method is still available in the rig, allowing users to switch between the methods, as desired. I've been publicly critical of the older K4 LMS NR method for SSB on user forums and mailing lists, especially for a flagship rig at this price. So when the SSNR firmware announcement was made, I installed it within an hour of its release. Short version: this is a HUGE improvement. I don't what other HF rigs have deployed this technique, but IMO, this development keeps the K4 at the top of the list of Amateur HF rigs.

I made a video comparing the...
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