Antennas-Amplifiers 6347 Dual Band 2M/70cm 750W Diplexers

Antennas-Amplifiers 6347 Dual Band 2M/70cm 750W Diplexers are high‑power, bidirectional 750 watt diplexers designed for seamless operation across the 2-meter (144–148MHz) and 70cm (430–450MHz) amateur bands. They provides efficient VHF/UHF signal combining and separation, ensuring maximum flexibility for single‑feed and dual‑feed station configurations.

The Antennas‑Amplifiers 6347 Diplexer supports the following functional capabilities:

- Connecting two separate 2m and 70cm transceivers to a single‑connector dual‑band antenna, or

- Combining a two‑connector dual‑band antenna—or two separate VHF and UHF antennas—into one coaxial feedline for use with a transceiver that has a single antenna port.

When used in pairs—one at the antenna system and one at the radio end enables you to run one coaxial cable between the two points. One diplexer combines the antennas, and the other cleanly splits them back into independent 2m and 70cm paths.

The 6347 achieves exceptionally low insertion loss thanks to its use of high‑Q inductors and capacitors built on premium Rogers laminate substrates. Its advanced filter design delivers isolation up to 75dB, dramatically reducing crosstalk between bands and ensuring clean, interference‑free operation even under demanding RF conditions.

With 750 watts capability on both 2m and 70cm, extremely low loss, and industry‑leading isolation performance, this is truly one of the highest‑performing dual‑band diplexers available for serious VHF/UHF operators.

Additional Features & Specifications

2m Port:

• Frequency range: 144-148MHz

• Insertion Loss: 0.04dB

• Return Loss: ≤-30dB

• 70cm Isolation: ≥ 75dB

• Maximum Power Input at 1:1 SWR: 750W

70cm Port:

• Frequency range: 430-450MHz

• Insertion Loss: 0.07dB

• Return Loss: ≤ -25dB

• 2m Isolation: ≥ 75dB

• Maximum Power Input at 1:1 SWR :750W