RTC25 is a compact 2x50 W transmitter‑combiner for OB‑VAN radio‑link systems. It accepts two transmitters up to 50 W each, delivers very low intermodulation, a sharp low‑pass output filter, and high input isolation via circulators. It tolerates mismatches by routing reflected power to an internal 100 W dummy‑load. Front‑panel meters read output and reflected power; SWR >1:2 triggers a red LED. Frequency ranges: 170–250, 305–360, 470–880 MHz. Size 243 × 87 × 230 mm; weight ~4 kg; DC 10–20 V.