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Common Mode Filters Product List

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[HF Band Compatible] High-Performance Common Mode Filter CMF250

[HF Band Compatible] High-Performance Common Mode Filter CMF250

Effectively cuts unnecessary radiation in the HF band! Reduces noise interference with TVs and radios.

The CMF250 (CMF-250) is a high-performance common mode filter manufactured by Daiichi Denpa Kogyo (DIAMOND). It is a compact and small filter, measuring less than 20 cm, that effectively reduces unwanted radiation in the HF band, making it effective against radio interference. It suppresses radio interference (interference) such as TVI and BCI caused by common mode radiation. It has an attenuation of over 30 dB even in low band frequency ranges, making it effective for suppressing radio interference. It has low loss and can be used with radios of up to 200W. It is also effective in preventing malfunctions and electric shocks due to stray currents. It is connected between the radio and the antenna. *For more details, please feel free to contact us.

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High-performance common mode filter CMF2000B

High-performance common mode filter CMF2000B

Supports input power of 2kW. Strongly reduces common mode noise in the HF to 50MHz band.

The CMF2000B (CMF-2000B) is a high-performance common mode filter manufactured by Diamond. It effectively reduces common mode noise (high-frequency interference) that can be problematic in amateur radio and HF band communications. It supports frequencies from 1MHz to 54MHz (HF to 50MHz band) and features a high-power design with an input capacity of 2kW (PEP), making it safe to use in environments with linear amplifiers. It contributes to noise reduction during high-output operations, preventing interference with shack peripherals and stabilizing transmission quality. This product is used by connecting it between the radio and the antenna. ■ Connection Examples When using a linear amplifier: Radio ⇆ Linear Amplifier ⇆ CMF2000B ⇆ Antenna When using an external antenna tuner: Radio ⇆ CMF2000B ⇆ External Antenna Tuner ⇆ Antenna The impedance is 50Ω, and the connector is M-J type. It is designed for easy integration into existing radio equipment. *For more details, please feel free to contact us.

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