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The Tour de France Radioamateur Challenge is a special on-air operating event organized by the REF in partnership with local amateur radio clubs and associations. It runs in parallel with the 2026 Tour de France cycling races — the men’s edition (4–26 July) and the women’s edition (1–9 August). Throughout the event, special event stations with the callsign TMxxTFR (where “xx” is the two-digit French department number) will be activated for one week in departments hosting a stage start or…