Antennas-Amplifiers 6344 Double 2x200W 2m & 70cm Bandpass Filters are a dual‑band, dual‑power 2×200W band pass filter engineered for clean, interference‑free operation on both 144–148MHz (2m) and 430–450MHz (70cm). This “double” filter design incorporates two independent high‑power bandpass sections, each rated for 200 watts, providing exceptional filtering performance for stations using a single‑feed dual‑band antenna.

Built to dramatically reduce unwanted signals, the 6344 suppresses not only HF, 6m, 4m, and FM broadcast interference but also problematic intermediate VHF/UHF frequencies such as 170MHz and 210MHz, as well as key harmonic ranges including 288MHz, 720MHz, 880MHz, and more. The result is a cleaner signal path and significantly reduced receiver overload in busy RF environments.

With very low insertion loss on both amateur bands, the filter maintains full transmit and receive performance while sharply attenuating out‑of‑band energy. Its dual‑band architecture makes it especially ideal for use with 2m/70cm dual‑band antennas that use a single connector, providing excellent front‑end protection without complicating station layout.

Key Benefits:

- Two independent 200W band pass filters in one compact enclosure

- Extremely low insertion loss on 2 meters and 70cm

- Strong suppression of HF, VHF, UHF, and harmonic interference

- Excellent protection against receiver overload

- Ideal for dual‑band antennas

ATF-6344 Electrical characteristics

Insertion loss:

• 1.8 MHz: 110 dB

• 7.1 MHz: 107 dB

• 14 MHz: 105 dB

• 28 MHz: 99 dB

• 50.2 MHz: 77 dB

• 70.2 MHz: 66 dB

• 88 MHz: 56 dB

• 108 MHz: 43 dB

• 144–148 MHz: 0.33 dB, RL ≤ –24 dB

• 170 MHz: 26 dB

• 185 MHz: 40 dB

• 210 MHz: 51 dB

• 288 MHz: 30 dB

• 330 MHz: 20 dB

• 430–450 MHz: 0.22 dB, RL ≤ –30 dB

• 576 MHz: 21 dB

• 720 MHz: 38 dB

• 880 MHz: 45 dB

• 930 MHz: 48 dB

• 1296 MHz: –12 dB

Max. Power Input at SWR:

• 1:1 = 200 W

• 1:1.5 = 150 W

• 1:2 = 120 W

• 1:3 = 85 W