Search results

Version 0.7 of Open Tuner, released on April 27, 2023, marked a significant milestone by introducing proof-of-concept dual tuner functionality for the BATC Minitiouner. This C# client, inspired by Heather Lomond's _Longmynd_ project, aims to leverage both tuners and demodulators within the NIM module, a capability crucial for advanced Digital Amateur Television (DATV) operations on QO-100 and terrestrial links. My own experience with DATV often involves juggling multiple receive paths, so a unified client like this simplifies the workflow considerably. Further enhancing its utility, version 0.9 (February 11, 2024) integrated support for the Raspberry Pico, utilizing Colin (G4EML)'s _PicoTuner_ firmware. This offers a more accessible and cost-effective alternative to the traditional FTDI module, streamlining dual tuner setups with a single USB cable. The project's evolution reflects a practical approach to overcoming hardware availability challenges. The software is developed using Visual Studio 2019/2022 and .NET Framework 4.7.2, requiring specific Nuget packages like VLC/Websocket and an ffmpeg folder for full operation. It's an active, community-driven effort, with the source code openly available on GitHub for contributions and bug reporting, embodying the collaborative spirit of amateur radio development.

Demonstrates firmware for microcontrollers like the _ESP32_ to implement a LoRa APRS iGate and Digipeater. This project leverages LoRa for packet radio communication, allowing amateur radio operators to bridge the gap between LoRa-enabled APRS stations and the global APRS-IS network via WiFi. It details the setup for both iGate and Digipeater modes, including features like transmitting APRS-IS packets over LoRa to local stations and a 30-second buffer in digipeater mode to prevent packet storms. This firmware offers an Ultra Eco Mode, achieving current consumption between **7mA** and **13mA**, making it suitable for remote, battery-powered deployments. The integrated WebUI simplifies configuration and management, providing an accessible interface for hams to deploy and maintain their LoRa APRS infrastructure. It supports sending weather telemetry packets and adheres to APRS protocols, released under the GPL-3.0 license.

The resource details the use of LoRa for AX.25 packet radio and APRS, focusing on practical implementation. It specifies UK LoRa APRS frequency and modulation settings: **439.9125 MHz**, 125kHz bandwidth, SF12, and CR 4/5. The content provides a mini how-to for setting up an iGate using VS Code and _Platformio IDE_, with specific instructions for a Lilygo LoRa32 V2.1_1.6 board, including configuration for Wi-Fi, beaconing, and APRS-IS passcode. It also covers tracker setup using a Lilygo T-Beam Supreme, detailing firmware flashing and configuration for mobile operation. The guide differentiates LoRa APRS from traditional connected-mode packet radio, explaining why common LoRa APRS firmware is unsuitable for full AX.25 packet due to its TNC2-style payload structure. It explores alternative solutions for true LoRa packet radio, such as using an _RNode_ TNC or Raspberry Pi LoRa TNCs, and provides commands for RNode firmware installation and configuration for serial KISS operation. The resource also touches upon licensing requirements for unattended Digipeaters in the UK, noting the need for ETCC coordination and MB7Uxx callsigns.

Operating a _MeshCom_ node requires specific firmware, and this web-based installer, developed by OE1KFR, streamlines the process for ESP devices. It provides a user-friendly interface for flashing and updating the MeshCom firmware, emphasizing the critical step of using the ERASE option during initial installations or when transitioning from other applications. The tool also advises users to verify their device settings after upgrading to firmware version **4.35p**, ensuring proper operation and configuration retention. This installer simplifies the deployment of MeshCom for amateur radio operators interested in mesh networking and LoRa applications. By offering a direct web interface, it removes the need for complex local toolchain setups, making it accessible for a broader range of hams. The direct download option for firmware versions further enhances its utility, providing flexibility for users to select the appropriate release for their specific ESP hardware.

For amateur radio operators seeking resilient, off-grid communication, the _MeshCom_ firmware provides a robust solution for text-based messaging over a mesh network. Utilizing LoRa modulation and the APRS protocol, this firmware is designed for low-energy consumption and cost-effective hardware, primarily operating in the 70cm band. Nodes, identified by amateur radio callsigns, can send short text messages to all participants or directly to specific callsigns, functioning as repeaters to extend network reach. The system supports automatic status and position messages, with optional sensor data for WX-Data and Telemetry. MeshCom nodes can be configured as gateways to HAMNET or the internet, enhancing connectivity options. The project emphasizes a self-building and self-healing mesh network architecture, crucial for emergency communication scenarios. Operating frequencies include **433.175 MHz** (EU, USA, Africa), 439.9125 MHz (UK), and 433.925 MHz (Norway). The firmware is compatible with hardware platforms such as ESP32/LoRa modules, RAK-WISBLOCK, and ESP32-DEV4/E22-LoRa, offering a flexible deployment for various amateur radio applications.

Setting up a digital mode station for Radioteletype (RTTY) contesting requires careful integration of transceiver and logging software. This guide outlines the specific configuration for a Yaesu FTDX10 and N1MM Logger, focusing on settings relevant for the 2025 CQ WW RTTY contest. It covers digital mode setup within N1MM, mode control, and RTTY-specific parameters, including the use of the FTDX10's DATA-L or RTTY-L modes. Operational guidance includes leveraging the 300Hz CW roofing filter for enhanced adjacent signal rejection and proper MMTTY window resizing to ensure accurate FFT and XYScope displays. The author notes a consistent received signal offset of -1.5 kHz from the VFO frequency during operation. Specific software versions used are N1MM V1.0.10936.0, MMTTY 1.70, and various FTDX10 firmware versions. The document also mentions an unsuccessful attempt to integrate a WinKeyer USB (WKSMT, firmware 31.03) for FSK waveform generation, where N1MM could key the radio and 100W was measured, but no tones were observed on the FTDX10's scope displays.

Presents a Windows software application specifically engineered to interface with NanoVNA vector network analyzers. The application's source code reveals modules like Calibration.cpp and GraphUnit.cpp, indicating robust functionalities for VNA calibration procedures and graphical visualization of RF measurement data. It supports various NanoVNA firmware versions, including NanoVNA H v1.2.24.dfu and NanoVNA H4 v1.2.24.dfu, ensuring broad compatibility across popular hardware iterations. Key components such as BatteryVoltageUnit.cpp, ColourPickerUnit.cpp, and SerialPort.cpp manage battery monitoring, user interface customization, and serial port communications, respectively. DataUnit.cpp handles measurement data processing, while SettingsUnit.cpp provides comprehensive control over application configurations, allowing hams to tailor the software to their specific analysis needs. The project integrates USB100.H and USBDI.H for direct USB connectivity and TCPIP.cpp for network-based communication, offering flexible options for connecting to NanoVNA devices. This software streamlines the process of analyzing and interpreting RF characteristics, making it a practical tool for antenna tuning and circuit analysis.

Eight specific user interface limitations are identified in the Yaesu FTdx10 transceiver's firmware, drawing on the author's extensive software engineering background and experience with Icom IC-705 and IC-7300 interfaces. The analysis highlights issues such as the main dial Lock button disabling the RX/TX Clarifier, which impedes net control and pile-up operations. It also points out the FTdx10's spectrum scope display modes lack a "Scroll-F" equivalent for efficient band scanning, a feature common in Icom radios. Further points address the inability to access screen-based settings during transmit, the need for improved antenna tuner behavior with an option to reset settings and intelligent segment recall, and limitations when using an external mouse, such as the scroll wheel not functioning as the main dial or function knob. The author also notes the lack of automatic power reduction when using external LDG tuners and the CW decoder's all-caps display, which hinders readability. These observations aim to guide Yaesu in enhancing the FTdx10's user experience, leveraging its strong receiver performance and advanced features.

The Yaesu FTdx10 HF transceiver underwent comprehensive laboratory testing by Sherwood Engineering, with results documented on December 29, 2020. Key receiver performance metrics include IF bandwidth measurements at -6 dB and -60 dB for 2400 Hz and 500 Hz filters, showing ultimate rejection exceeding 100 dB and 105 dB respectively. Front-end selectivity and first IF rejection at 9005 kHz were measured at 91 dB. Receiver dynamic range, both with and without preamps, was consistently 107 dB at 20 kHz, 10 kHz, 5 kHz, and 2 kHz spacings without preamplification, and 106 dB with Preamp 1 at 20 kHz. Blocking performance reached 141 dB at 100 kHz offset with a 1uV signal. Phase noise was normalized across offsets from 2.5 kHz to 500 kHz, with a value of -145 dBc/Hz at 2.5 kHz and -155 dBc/Hz at 500 kHz. Reciprocal Mixing Dynamic Range (RMDR) peaked at 128 dB at 500 kHz spacing. Noise floor measurements for SSB and 500 Hz bandwidths at 14 MHz and 50.125 MHz showed -133 dBm with Preamp 2 at 14 MHz SSB. Sensitivity figures and S-meter accuracy were also documented, with one S unit equating to 3 dB from S3 to S9. Transmitter composite noise was measured at 100 watts and 30 watts, with values like -123 dBc/Hz at 2 kHz offset for 100 watts. Operational observations from the January 2021 CQWW 160m CW contest highlighted ergonomic issues, such as VFO knob placement and small buttons. A significant firmware limitation noted was the band scope and waterfall data being erased upon transmission, which severely reduces its utility for search and pounce operations.