Category: Other

DSG-22.6 GHz: An Open Source 300 MHz to 22.6 GHz Signal Generator

Thank you to Süleyman Dündar for submitting news about the pre-release of their new product called "DSG-22.6 GHz". DSG-22.6 GHz is a compact, handheld, open-source RF signal generator covering a continuous range from 300 MHz to 22.6 GHz with 1 Hz tuning resolution, 40BC harmonic level, and power output ranging from 15 dBm to -50 dBm.

An RF signal generator produces a clean, stable radio frequency signal at a chosen frequency. It is a helpful tool for testing SDRs and other radio equipment, such as low-noise amplifiers (LNAs), RF filters, mixers etc.

Competition to the DSG-22.6 GHz may include the ERASynth Micro and moRFeus; however, neither covers the wide frequency range of the DSG-22.6 GHz, and it appears that the ERASynth Micro has been discontinued.

Currently, the product is in the pre-release crowdfunding stage on Crowd Supply, so pricing hasn't been revealed. Interested individuals can subscribe to receive updates on their campaign page. The open source code can also be found on GitHub.

DSG-22.6 GHz. An upcoming wide frequency range, hand held and fully open source signal generator.
DSG-22.6 GHz. An upcoming wide frequency range, hand held and fully open source signal generator.

 

ESP32 Bus Pirate: Turn your ESP32 into a Multi-Purpose Hacker Tool

Thank you to "Geo" for writing in and sharing with us his open source project called "ESP32-Bus-Pirate" which he thinks might be of interest to those in the RTL-SDR community. The ESP32 is a popular low-cost microcontroller due to the fact that it has WiFi and Bluetooth capabilities built in. Although the ESP32 does not have true SDR capabilities, it can leverage its numerous built-in hardware radio components to achieve various interesting feats. Geo writes:

This firmware turns an inexpensive ESP32-S3 board into a multi-protocol debugging and hacking tool, inspired by the original Bus Pirate and the Flipper Zero.

It currently supports a wide range of protocols and devices, including I²C, SPI, UART, 1-Wire, CAN, infrared, smartcards, and more. It also communicates with radio protocols as Subghz, RFID, RF24, WiFi, Bluetooth.

Compared to existing solutions, the focus is on:

Accessibility — runs on cheap ESP32-S3 hardware (around $7–$10).

Versatility — one device can probe, sniff, and interact with multiple buses.

Extensibility — open-source and modular, making it easy to add new protocol support.

I believe this could be useful for hardware hackers, security researchers, and hobbyists looking for a low-cost, flexible alternative to commercial tools.

With the firmware installed on a compatible ESP32 device, it is possible to create WiFi, Bluetooth, and RF24 sniffers, scanners, and spoofers, as well as perform general sub-GHz and RFID sniffing, scanning, and replay attacks. It also has a host of non-RF capabilities useful for hacking devices.

PhaseLoom: A Software Defined Radio Powered by the Chip used in the Commodore 64, NES and other Early Home Computers

The MOS Technology 6502 is, by today's standards, an ancient chip, having just turned 50 this September 8. It was the chip behind the early age of home computing, powering iconic systems like the Apple I & II, Commodore 64, Atari, and Nintendo Entertainment System. It is, therefore, fascinating that someone has managed to use this chip as a core component in a modern software-defined radio system.

Over on his blog, Anders B Nielsen describes PhaseLoom, a 6502-based "Quadrature Sampling Detector Phase-Locked Loop SDR frontend". Realistically, we want to point out that the 6502 isn't actually doing any digital signal processing (DSP). The 6502 is used as an assembly programmed controller for a SI5351-based local oscillator and multiplexor chip that generates IQ data. Piping the IQ data into a PC with a soundcard is still required to actually get data out. However, Anders notes that he eventually hopes to get some DSP running on the 6502.

With the setup he is currently able to tune just to he 40m band, noting that performance isn't great, but at least it works!

Anders' video below explains the entire design and concept in detail, and we note that he is currently selling a full kit on his store and has uploaded the schematics to GitHub.

A 6502 Software Defined Radio

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