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Author Archives: Steve Netting OH3SPN
Introducing FreeDV Reporter+
I’ve been having a great time exploring the latest developments in FreeDV, especially with the recent rollout of the new RADEV1 mode. The audio quality and robustness are genuinely impressive and it’s breathed new life into digital HF voice. As … Continue reading
Vertical vs Horizontal – HF Monopole vs Dipole
This article should perhaps be titled ‘HF Quarter Wave Ground Mounted Vertical Monopole With Radials vs Horizontal Half Wave Dipole at Quarter Wavelength Height’ but that seemed a little wordy. Having recently resolved my noise issues (which is probably worthy … Continue reading
Posted in Uncategorized
Tagged antenna, dipole, dipole vs vertical, gain, MMANA-GAL, model, radials, vertical
4 Comments
An Introduction to JS8CALL
Most introductions to JS8CALL cover configuration and calling CQ. Whilst this is useful I feel it overlooks the power and flexibility of the mode. In this article I hope to jump straight to the more interesting capabilities. Firstly, the very … Continue reading
Configuring Hermes Lite 2 SDR, Quisk, Direwolf and Hamlib
After multiple failed attempts to trigger Quisk PTT via CAT on a virtual serial port, I discovered later Direwolf versions include support for Hamlib. This itself was also not straightforward as by default, Direwolf is not compiled with Hamlib support. … Continue reading
GridTracker; a JTAlert for Linux?
As a Linux user I’ve never used or understood the advantages of JTAlert. Attempts to explore this have also failed due to JTAlert not playing well in WINE. However, I recently saw comments online suggesting GridTracker is JTAlert for Linux, … Continue reading
70W HF Linear Amplifier Project
Whilst very happy with the performance of the Hermes SDR, I’ve been considering a matching HF linear to provide a moderate (6-9dB) increase in output power. I have ideas about operating portable using battery power; ~50W seems a nice balance … Continue reading
Posted in Uncategorized
Tagged amplifier, battery, hermes, linear, PA, protection, SDR, SWR
2 Comments
Hermes Lite 2 SDR Transceiver
The Hermes-Lite is a low-cost direct down/up conversion software defined amateur radio HF transceiver based on a broadband modem chip and the Hermes SDR project. It is entirely open source and open hardware, including the tools used for design and fabrication files. Over … Continue reading
OH3SPN FT8 Activity
I’m now active from Tampere, Finland using the call OH3SPN, primarily FT8 on 30/20/17m due to antenna restrictions; FT817 (typically 2.5W out), G4ZLP MinoProSC interface, indoor SPX-100 antenna or short wire connected to LDG Z100 Plus. I’m very happy to report … Continue reading
CQ DE OH/M0SPN
As of April 2018 I’m now located in Tampere, Finland, Locator: KP11UL. You may see my call appearing in various logs with an OH prefix whilst I’m awaiting my official Finnish callsign. I’m currently maintaining both (M0SPN and OH/M0SPN) callsign … Continue reading
