Category: Other

EU Ham Radio Shops Suspend Shipments to the United States

With the recent changes to US import policy, many shops in the EU, including ham radio shops, have begun suspending shipments to the United States. This is the result of both a widespread suspension of shipments to the US by most EU mail carriers and the ongoing unpredictability of the situation.

One French reseller of our products has written in to our blog, and wanted to explain the reason for their decision to suspend shipments to the US. We believe that other ham radio shops in the EU may also be in a similar position.

To our US Amateur Radio Clients and Community

Because of the recent 15% tariff increase on products imported from the European Union, the suspension of several carrier services to the US, and the growing complexity of the US import system, our online shop Passion-Radio.com must suspend all shipments to the United States until further notice.

In particular, La Poste, the French national postal operator, suspended parcel shipments to the United States as of August 25, 2025 (1), removing one of the main EU–US postal channels. At the same time, UPS announced that starting September 8, 2025, an additional international processing fee will apply to all import shipments, regardless of origin.

There has also been some misunderstanding regarding customs procedures. When parcels arrive in the United States, the buyer must settle not only the 15% customs duty, but also the service fee charged by the carrier for filing customs declarations and advancing duties to US Customs. These charges are billed locally at delivery and remain outside the seller’s control. Import duties and tariffs are always the responsibility of the buyer, not the seller.

"Unfortunately, with constant changes in tariffs, rates, and carrier processes, we cannot guarantee fair, efficient, and transparent shipping conditions," said David, F1JXQ, Director of Passion Radio. "Our goal is to resume shipments to the US as soon as a reliable and cost-effective solution is available for everyone."

Meanwhile, our collaboration with five US-based suppliers continues without disruption, as the European Union has not imposed any retaliatory tariffs or reciprocal 15% import duties on products arriving from the United States.

Updates will be communicated through our shop: https://www.passion-radio.com/store/hamradio-us-tariff-43 and our social channels.

To all our US friends on the bands: we thank you for your understanding and support, and we look forward to resuming deliveries as soon as possible.

They go on to explain an example:

Practical tariffs impact on an item €50

Before tariffs (without 15%, rate €1 = $1.12 April 2025 rate)

Conversion: €50 × 1.12= $56.00*

Total payable ≈ $56.00

After tariffs (with 15%, rate €1 = $1.16 August 2025 rate)

Conversion: €50 × 1.16 = $58.00*

Customs duty 15%: $58.00 × 0.15 = $8.70

Carrier fees (on average, import processing): $15.00

Total payable ≈ 58.00 + 8.70 + 15.00 = $81.70

Total surcharge ≈ +$25.70 (~+45.89% increase compared to $56.00, before tariff tax)

* Not calculated, fees that may apply when converting Euro € <> US $.

FAQ

• Q1: Who pays import duties and tariffs when ordering from Europe?

By law, the US buyer must pay all customs duties, tariffs, and fees when importing goods from Europe. These charges are not paid by the seller.

• Q2: Why do carriers charge extra fees?

Carriers like UPS, FedEx, or DHL must submit customs declarations and advance duties to US Customs. For this, they bill a brokerage or processing fee directly to the buyer.

Sources :

(1) https://www.lemonde.fr/economie/article/2025/08/22/la-poste-suspend-l-envoi-de-colis-vers-les-etats-unis_6633516_3234.html

Tech Minds: Testing the ATS Decoder Mega SDR Radio

Over on YouTube Matt from the Tech Minds channel has uploaded a new video showing his testing of the "ATS Decoder Mega" which is a handheld software-defined radio (SDR) with a built-in LCD screen and tuning knob.

In the video, Matt shows the UI of the SDR, as well as some features like its built-in digital mode decoders like FT8, SSTV, RTTY, CW. Unfortunately, Matt notes that the performance of all digital modes tested was subpar, possibly due to a lack of CPU processing power. Matt goes on to show that reception of SSB and AM signals works fine.

ATS Decoder Mega SDR Radio - Apparently it can decode digital modes!

KISS_LoRa_TAK – Integrating ESP32 LoRa with TAK

Thank you to YD1RUH for writing in and sharing his open-source KISS_LoRa_TAK project with us. YD1RUH writes:

I’d like to share a small open-source project that I believe could be valuable for the RTL-SDR and tactical radio communities: KISS_LoRa_TAK, a minimalistic approach to integrate ESP32-based LoRa modules with ATAK (Android Team Awareness Kit) using a simple web-based configuration and KISS principles (Keep It Simple, Stupid).

The project is documented here:
📎 GitHub: https://github.com/YD1RUH/KISS_LoRa_TAK

It includes a web UI for setting LoRa parameters directly from a browser, turns the ESP32 into a configurable CoT forwarder over LoRa, and allows ATAK users to operate in disconnected environments — all from a low-cost module like the TTGO LoRa32-OLED.

  • The documentation covers:
  • How to flash the firmware and get started
  • Web interface preview
  • ATAK connection instructions
  • Recommended LoRa settings for various terrains
  • Screenshots of the system in use
ATAK (Android Tactical Awareness Kit) + LoRa Lowbudget Poorman Tech #ATAK #LoRa

ESP32 Tak LoRa Hardware
ESP32 Tak LoRa Hardware

ESP32-Div: An ESP32 Based Swiss Army Knife for Wireless Networks

On his blog, Cifer has posted about a new device that he's created called "ESp32-Div." ESP32-Div is a multi-featured wireless analysis device for WiFi, Bluetooth, 2.4 GHz, and sub-GHz signals. While ESP32-Div is not based on SDR technology, it is still an interesting device for wireless hackers to discuss.

ESP32-Div can monitor WiFi packets, spam fake WiFi access points, scan for deauth attacks, and scan nearby WiFi networks. For Bluetooth, it can jam, scan, spoof, and cause unintended behaviours on Apple devices via spoofing the AirDrop function. It can also be used as a general 2.4 GHz scanner and jammer. Finally, it can perform replay attacks and jam signals for sub-GHz signals.

The device consists of a custom PCB with an ESP32 and a built-in battery pack. A piggybacking shield adds 3x NRF24 modules for the 2.4 GHz features and a CC1101 module for the sub-GHz features.

Obviously, functions like jamming and spoofing are highly illegal in most countries, but it is interesting to see the capabilities available to anyone with these cheap chips and the right software.

ESP32-DIV: Your Swiss Army Knife for Wireless Networks

Creating a Drone Based Synthetic Aperture Radar

Synthetic Aperture Radar (SAR) is a technique that can generate high-resolution imagery through the use of radar microwaves on a moving platform. Placing the radar system on a moving platform allows the system to simulate a very large aperture. Combined with some clever algorithms, the result is very high resolution imagery available in all weather conditions.

Typically, SAR implementation is the domain of high-level military spy and commercial satellites such as ICEYE and Sentinel-1. However, on his blog, Henrik Forstén has shown that it's possible to create a homemade SAR system using an FPGA, ADC, and custom 6 GHz radar antennas mounted on an FPV drone. Henrik's blog explains his setup in detail, discussing the radar and RF design, link budget, FPGA, his custom PCB, focusing, and more.

The results are rather stunning images that look almost like a photograph. And not only was Henrik able to take images, but a video too, which can be seen on his blog post.

A Synthetic Aperture Image from Henrik's Drone

An RTL-SDR/LoRa/GPS/RTC/USB-Hub Extension Board for the uConsole

The uConsole is a handheld computing device developed by ClockworkdPi that costs US$189. Its computing power is based on a Raspberry Pi Compute Module 4, but other CPU options are also available. The uConsole comes with a 5-inch 1280x720 HD screen, keyboard, and battery module that takes two 18650 lithium-ion batteries.

The uConsole is also modular, allowing for expansion. We wanted to thank RTL-SDR.COM reader Sunny for sharing the news that a RTL-SDR/LoRa/GPS/RTC/USB Hub All-In-One Extension Board for the uConsole will be available from HackerGadgets soon. This board includes a full RTL-SDR module, an SX1262 LoRa chip, a GNSS chip, a real-time clock chip, and a USB hub. The expansion board is currently advertised as being priced at US$78.99.

The expansion board is not yet available for sale, but you can join their waiting list to be notified of its release.

Over on YouTube 'Symbiiote' has released an early review video showing how to build the module into the uConsole and then showing it running SDR++ and receiving some broadcast FM stations.

This uConsole accessory changes EVERYTHING!

A Handheld Cyberdeck with RTL-SDR

Over on his YouTube channel and Hackaday.io blog page, Nicholas LaBonte has shown his "Cyberdeck Handheld" which is a portable computer consisting of a Raspberry Pi 5, LCD screen, custom CNC'd keyboard, UPS module, and an RTL-SDR. All the components are placed in an aesthetically pleasing custom enclosure, made of some interesting premium materials like Sepele hardwood and Richlite. Nicholas writes:

Having been inspired by the uConsole and similar projects, I wanted to try my hand at building my own with off-the-shelf components. Richlite and Sepele hardwood would be used for the housing, materials that I have worked with furnishing yacht interiors. Combined with a bronze heatsink, I wanted to merge cyberpunk and nautical aesthetics. Since the keyboard was the biggest challenge, I started there by combining concepts from both Bobricius and the Ello 2M keyboards, settling on tabbed keys atop PCB-mounted microswitches.

Cyberdeck Handheld

ESPARGOS: An ESP32 Phased Array for Seeing WiFi

Recently, Florian Euchner, a research assistant at the Institute of Telecommunications at the University of Stuttgart, has released information about a project called ESPARGOS that he has been working on. ESPARGOS is a phased array of many patch antennas, each connected to an ESP32 WiFi microcontroller. Phased arrays enable interesting things like radio direction finding.

Combined with a bit of code, Florian can not only determine the direction of arrival of WiFi signals but, with enough patch elements, also create a live heatmap of the WiFi source overlayed on top of the video. We note that ESPARGUS is not based on software-defined radio, however, the overall concept and implementation are quite similar to KrakenSDR.

In the video embedded below, Florian explains the system and demonstrates it in action. He shows how the WiFi signal from a device can be visualized, how it can be used to track movement of the device behind a wall, how reflections from a directional antenna can be seen, how a device can be triangulated with multiple arrays. Finally Florian also shows how a device can be located with a single array, even in a high multipath environment after a neural network is trained on the environment.

Florian writes:

More information is available on the project website of the ESP32 antenna array "ESPARGOS": https://espargos.net/

Source code for Python library + demos: https://github.com/ESPARGOS/pyespargos (directory "demos/camera" for "WiFi camera" demo)

As a research assistant at the Institute of Telecommunications at the University of Stuttgart, I work on multi-antenna systems like (distributed) massive MIMO, with a focus on wireless channel measurement platforms and algorithms for processing channel measurements (classical and deep learning-based).

One day, my (incredibly talented) colleague Marc Gauger suggested to use ultra low-cost ESP32 chips instead of software defined radios for channel measurements. I was highly sceptical at first, but when he showed me a minimalistic prototype he had soldered together, I was intrigued by the idea of being able to demonstrate my algorithms in real time using WiFi signals. In a series of Bachelor's / Research theses, my excellent students Tim Schneider, David Engelbrecht and David Kellner helped me develop the ESP32 antenna array "ESPARGOS".

Measured CSI dataset used for AoA / TDoA visualization: https://espargos.net/datasets/data/espargos-0005/
AoA / TDoA localization source code (needs some minor modifications to be applied to espargos-0005 dataset): https://github.com/Jeija/ToA-AoA-Augmented-ChannelCharting/
Channel Charting source code for the animation in the video: 
https://github.com/Jeija/Geodesic-Uncertainty-Loss-ChannelCharting
Tutorial on Channel Charting: https://dichasus.inue.uni-stuttgart.de/tutorials/tutorial/dissimilarity-metric-channelcharting/

This ESP32 Antenna Array Can See WiFi

We note that while the software is open source, the array hardware itself is not. Florian has noted in a comment on his YouTube video that he is preparing a manufacturing run for ESPARGOS.

I am now preparing a manufacturing run for ESPARGOS. This involves some PCB redesigns to make the design more mass-manufacturable and to get the cost further down, and to get it certified. This will obviously take some time, but I will make sure to keep you updated. You can use the button on the website https://espargos.net/ to sign up for email updates, and I will also post updates via YouTube community notes.