Low-Pass Filter

Low-Pass Filters (LPF) for FM broadcast transmitters — clean up your amplifier's output by suppressing harmonics before the antenna. Rated from 1 kW to 3 kW across the 87.5–108 MHz band, an LPF is the difference between a clean legal signal and interference that draws complaints.

• 0–1 kW LPF coupler — 88–108 MHz low-pass filter with coupler tap for forward/reflected power sampling
• LPF-3000 pallet — 3000 W (3 kW) low-pass filter for high-power FM amplifiers, 87.5–108 MHz
• Suppresses harmonic energy above the FM band, protecting your antenna system and meeting spectral purity expectations
• Standard component in DIY pallet builds and a wise retrofit for amplifiers with hot harmonic output

If your power meter shows good VSWR but listeners report hash and spurs, harmonics are the usual suspect — an LPF between amplifier and antenna solves it. Building a pallet amplifier? Pair the LPF with our MOSFET transistors, power supplies and RF connectors. Contact us for guidance on filtering your power class.