Antennas‑Amplifiers 6320 2‑Meter 1500W Transmit Band Pass Filters are engineered for high‑performance 144–148MHz operation, delivering exceptionally low loss and outstanding harmonic suppression for demanding transmit and receive environments. Built with ultra‑high‑Q coils and capacitors—each exceeding a Q factor of 4500—these filters achieve their low‑loss performance through precise component selection and meticulous factory alignment. Designed primarily for high‑power transmitting applications, the 6320 also excels as a receive‑chain protector, making it suitable for placement ahead of wideband LNAs (low noise amplifier) to shield sensitive front‑end devices from powerful out‑of‑band RF energy.

Supporting amplifiers such as the 8877, GS35, GS31, and other tube‑ or transistor‑based stages up to 1.5kW output, the 6320 delivers exceptional stability under heavy load. Its integrated 12VDC cooling fan ensures reliable thermal management during extended operation, while rugged N‑type female connectors provide secure, low‑loss RF connections. The filter’s performance makes it ideal for DXpeditions, multi‑multi contest stations, and installations where strong HF, 6‑meter, 1.25‑meter, or 70‑centimeter signals would otherwise overload receivers or degrade system sensitivity.

Offering deep suppression of unwanted signals from HF (1.8–28MHz), 50–54MHz, and 70cm (430–440MHz), the 6320 effectively eliminates harmonics and reduces the risk of TVI and RFI issues—an important advantage for operators working in close‑proximity residential environments. All performance data for the 6320 is verified using an HP8753ES network analyzer with full two‑port calibration, ensuring accuracy and real‑world confidence in its measured attenuation and insertion‑loss characteristics.

Achieved Results on a built and tested 6320 Band Pass Filter

• 1.8MHz: –100dB

• 3.8MHz: –91dB

• 7.1MHz: –81dB

• 14MHz: –67dB

• 21MHz: –58dB

• 28MHz: –51dB

• 50MHz: –34dB

• 54MHz: –31dB

• 144MHz: –0.09dB

• 145MHz: –0.086dB

• 146 MHz: –0.09dB

• 148MHz: –0.089dB

Harmonics and interfering signals:

• 288MHz: –40dB

• 296MHz: –37dB

• 430MHz: –41dB

• 432MHz: –42dB

• 440MHz: –44dB

• 576MHz: –36dB

• 720MHz: –34dB

• 880MHz: –33dB (GSM – Mobile phone)

• 930MHz: –31dB (GSM – Mobile phone)

• 960MHz: –29dB (GSM – Mobile phone)

• 129 MHz: –17dB