CW / SSB Low-Pass Filter — 7 MHz / 10 MHz / 14 MHz Key benefits Selectable low-pass filtering at 7 MHz, 10 MHz and 14 MHz to remove unwanted higher-frequency interference and improve signal clarity. Designed for CW and SSB operation — reduces spurious and out-of-band noise so weak signals are easier to copy. Compact footprint (85 mm x 37.5 mm, excluding connectors) for simple integration into rigs, test setups, or small enclosures. Straightforward compatibility with 20 m, 30 m and 40 m HF use cases where LPF protection is required. What this product does for you Prevents higher-frequency interference from degrading received audio and demodulated signals. Helps maintain cleaner transmit and receive paths in crowded RF environments, improving listening quality and tuning accuracy. Fits into compact installations without adding bulk, making it practical for bench use, field stations, and contest stations. Important attributes Function: CW / SSB low-pass filter (LPF) Frequency options: 7 MHz, 10 MHz, 14 MHz Applications: 20 m, 30 m, 40 m HF bands (CW and SSB) Size: 85 mm x 37.5 mm (measurement excludes connectors) Installation: compact module suitable for integration into existing radio equipment or enclosures Practical use scenarios Ham radio contesting: Install ahead of a receiver or transceiver input to reduce out-of-band interference during high-density pileups. Portable/field operations: Small size makes it easy to add RF filtering in portable stations, reducing unwanted signals from nearby transmitters. Home station or bench testing: Use on a workbench or in a home studio RF chain to keep HF signals clean when testing or receiving weak signals. This LPF provides focused HF filtering without change to your CW/SSB operation. Use the appropriate frequency option for the band you operate to minimize interference and improve overall signal quality.