Antennas-Amplifiers LPF30 HF Low Pass Filters are designed for use with legal-limit linear amplifiers up to 2kW. They operate across a passband frequency range of 1.5–29.7MHz with a low insertion loss of 0.07dB, maintaining signal integrity while suppressing harmonic frequencies generated by the amplifier. These filters feature a 50-ohm nominal impedance and come equipped with SO-239 coaxial connectors. Precision-tuned and verified using a calibrated HP8753ES network analyzer, they deliver low return loss and consistent attenuation performance. The LPF30 Low Pass Filters support flexible mounting in any position with the included 5mm mounting holes. Exceptional Performance is achieved through careful design, tuning, and component selection.

Additional Features and Specifications:

- Passband: 1.5 – 29.7MHz

- Insertion Loss: 1.8- 29.7MHz: <= 0.07dB

- Input Return Loss: Better than -29 dB

- Maximum SWR on any frequency: <= 1.074

- Nominal Impedance: 50-Ohm

Attenuation:

• 50 – 54MHz: >= 50dB

• 70 – 70.5MHz: >= 52dB

• FM 88 – 108MHz: >= 49dB

• 144 – 148MHz: >= 57dB

• 222MHz: >= 68dB

• 430 – 440MHz: >= 78dB

Maximum Power Input at 50% Duty Cycle:

• SWR 1:1: 2000W

• SWR 1:1.5: 1500W

• SWR 1:2: 1200W

• SWR 1:3: 1000W

- Coaxial Connectors: UHF SO-239 Female

- Filter Size: WxHxD 7.10 x 4.13 x 2.56 in. (180 x 105 x 65mm)

- Weight: 1.54 lbs. (.7kg)

- Mounting: Any position, 0.20 in. (5mm) mounting holes for surface mounting

- Working Environment: Indoor