Observe the bands, signals and propagation conditions.
The person behind the station
About me
My name is Didier and my amateur-radio callsign is F1SYH. This website brings together my background, radio activities, technical experiments and the tools I develop around the station.
My interest in radio began in 1989 through listening. Before transmitting, I learned to recognise bands, operating modes and propagation conditions. I became a licensed radio amateur in 1992, after using the callsigns F-10784, FA1SYH and FC1SYH, before finally adopting F1SYH.
Over the years, my activity has expanded from HF to VHF/UHF contacts, digital modes such as FT8 and FT4, voice over IP, SDR receivers and weather-satellite reception. I enjoy making a contact as much as understanding the complete technical chain that makes it possible.
The station has also become a laboratory combining radio, electronics, Linux, Raspberry Pi computers, networks, automation and Web publishing. This website serves as its dashboard, technical logbook and sharing space.
My radio activity
An approach focused on experimentation and digital communications.
Amateur radio is a very complete field of experimentation for me. It brings together electronics, antennas, propagation, computing and human contact. I am particularly interested in HF bands, digital modes, data transmission, satellite reception and voice-over-IP gateways.
Analyse the complete chain, from the antenna to the software.
Test, measure, correct and document the results.
Make data, images and explanations accessible on the website.
The shack as a laboratory
Radio and computing brought together in one system.
My installation is not limited to a transceiver. It includes Linux servers, Raspberry Pi computers, SDR receivers, audio interfaces, relays, scripts, APIs and dashboards. Every component must remain understandable, observable and, as far as possible, independent of the others.
HF
HF station
The Yaesu FT-710, the 40–10 m EFHW antenna, voice and digital modes, and station telemetry.
View the station →ARA
ARA network
A SVXLink-based UHF access point connected to amateur-radio networks and monitored locally.
Open ARA →SAT
Meteor satellites
137 MHz reception, SDR decoding and publication of the received weather images.
View the images →SYS
Automation and monitoring
Linux, scripts, MQTT, APIs, Home Assistant and fail-safe logic to keep the station observable and controllable.
Understand the system →AUD
Radio bulletins
Weather, propagation, radio information, space and REF content prepared and broadcast automatically.
Listen to the bulletins →EDU
Sharing knowledge
Reference sheets, calculators and exercises to help other enthusiasts discover amateur radio.
Discover the path →How I build projects
A few consistent principles behind the different projects.
Understand before automating
Useful automation must remain readable, verifiable and repairable. I always seek to understand every link before entrusting it to a script.
Bring radio and computing together
CAT, SDR, Linux, networks, MQTT and the Web do not replace radio: they make it easier to observe, operate and share.
Prioritise safety
An automated station must return to a safe state when a service, Raspberry Pi or network link fails.
Document and share
This website is also a public logbook: it preserves solutions, explains choices and makes experiments reproducible.
Why this website?
A dashboard, a technical memory and a space for sharing.
The F1SYH website has several complementary purposes:
- show the station’s real activity;
- publish received images and data;
- keep a record of experiments;
- explain technical choices without oversimplifying them;
- help visitors who want to discover or prepare for amateur radio.
73 de F1SYH
Didier · JN25LT
“Radio becomes even more interesting when listening, technology, automation and sharing are brought together.”