QRP Labs has released beta firmware enabling SSB (single-sideband) transmission and reception on the QMX transceiver. This firmware adds upper and lower sideband modes, along with a new CW mode with adjustable sidetone frequency and a wider range of speeds. Existing features like digital modes, FreeDV, and the touch-screen interface remain functional. The SSB implementation is still considered beta and requires careful tuning, particularly regarding microphone gain settings to avoid overdrive. Users are encouraged to provide feedback to help refine the firmware before its official release.
Hans Summers, the proprietor of QRP Labs, has announced the release of a beta firmware version enabling Single Sideband (SSB) modulation and demodulation functionality for the QMX, a general-purpose radio transceiver kit known primarily for its digital modes. This highly anticipated expansion of the QMX's capabilities marks a significant milestone, opening the door for voice communication and traditional ham radio operation on the platform.
The beta firmware, available for immediate download from the QRP Labs website, introduces a suite of features essential for SSB operation, including selectable upper sideband (USB) and lower sideband (LSB) modes, adjustable transmit power output up to a maximum of 5 Watts, and adjustable microphone gain settings for optimal audio levels. Furthermore, the firmware incorporates a Voice Operated Transmission (VOX) function for hands-free operation and a noise gate to suppress background noise during transmit periods.
While the beta release represents a substantial step forward, Mr. Summers emphasizes that it is still under development and may contain unforeseen bugs or performance limitations. He encourages users to download and experiment with the firmware, providing valuable feedback through email to aid in refining and stabilizing the SSB implementation for a final release. The post highlights specific areas of interest for user feedback, including the performance of the VOX and noise gate functions, the overall audio quality of both transmitted and received signals, and the efficacy of the Automatic Gain Control (AGC).
The post further elaborates on the configuration process for the SSB functionality, advising users to consult the comprehensive QMX manual for detailed instructions. It emphasizes the importance of calibrating the microphone input level using the provided menu options for achieving optimal audio fidelity. Additionally, the post reiterates the inherent experimental nature of beta software, reminding users to proceed with caution and to report any encountered issues to facilitate rapid improvement and eventual integration into the stable firmware release. It concludes by expressing enthusiasm for the expansion of the QMX's capabilities and anticipation for community feedback during the beta testing phase.
Summary of Comments ( 15 )
https://news.ycombinator.com/item?id=43397811
The Hacker News comments express significant excitement about the new SSB firmware for the QRP Labs QMX, praising its features and Hans Summers' (the creator's) work. Several commenters discuss their pre-orders and eagerness to try it out, noting the impressive performance achieved in such a small and affordable package. Some discuss the complexities of SSB implementation compared to digital modes, while others appreciate the continued support and updates for the QMX platform. A few express interest in its potential for portable operation and digital modes like FT8. Overall, the sentiment is very positive, reflecting a high level of anticipation and satisfaction within the amateur radio community.
The Hacker News post titled "QRP Labs QMX SSB beta firmware relased" (with a typo in "released") has generated a moderate number of comments, primarily focusing on the excitement surrounding the new SSB (Single Sideband) functionality for the QMX transceiver. Several commenters express enthusiasm and anticipation for trying out the new firmware.
One commenter highlights the impressive nature of achieving SSB on such a small and low-power device, praising the technical accomplishment. They specifically mention the challenge of implementing the Hilbert transform, a crucial component of SSB modulation, within the limited resources of the QMX.
Another user chimes in, appreciating the community-driven development process and the responsiveness of QRP Labs to user feedback. They suggest this open approach contributes significantly to the success and popularity of the QMX platform.
A discussion thread develops around the topic of digital signal processing (DSP) versus traditional analog methods for SSB generation. Commenters debate the merits of each approach, considering factors like power consumption, complexity, and audio fidelity. Some express a preference for the "purity" of analog SSB, while others acknowledge the flexibility and advanced features enabled by DSP.
One user questions the practical utility of SSB on such a low-power device, given the inherent limitations of QRP (low-power radio) operation. However, another commenter counters this by pointing out the significant advantages of SSB in terms of spectral efficiency and improved intelligibility in crowded bands, even at low power levels. They emphasize the importance of efficient communication in emergency situations, a common use case for QRP.
Finally, several commenters share their experiences with other QRP Labs products and express confidence in the quality and performance of the new SSB firmware. They anticipate further improvements and refinements as the beta testing progresses. Overall, the comments reflect a positive and enthusiastic reception of the new SSB feature for the QMX.