RPA25 is a compact 25 W RF power amplifier in a 2U 19'' rack, designed for reliable operation with very low intrinsic noise and a sharp output low‑pass filter. Its output-mismatch tolerance uses a built‑in output isolator that redirects reflected power to a dummy load, preventing final‑stage overload. Features front‑panel PWR ADJ, precise PWR/REFL meters, temperature monitoring with automatic shut‑off, and a wide DC‑DC input range. Available in 300–360 MHz or 470–880 MHz, 50 Ω I/O.