2 meter 144 MHz – 148 MHz 1.5 kW <0.1 dB Low Loss Transmitting Band Pass Filter with “N” connectors
2 meter Bandpass Filter BPF uses high Q coils and capacitors with Q more than 4500. Low loss of filter achieved with careful design and adjustment.
Although intention of this filter is to be used as transmitting filter, design allows also to be used as receiving filter before wideband LNA to protect sensitive device from strong out of band signals. Like this.
Intended to be used with linear amplifiers. Some examples are 8877, GS35, GS31, as well as with other tubes or transistors up to 1.5 kW output.
Super low insertion loss. Excellent to put before any LNA or protect receiver from HF transmitters in DX expeditions or in multi-multi environment. This BPF will suppress any signals from HF 1.8 – 28 MHz stations, 50-54 MHz, 70 cm – 432 MHz (430 – 440 MHz).
This filter uses “N” connector type. Similar Low Loss Band-pass Filter designed for 4 kW linear power output that uses 7/16 DIN connectors.
Filter will reduce TVI problem or your problem with neighbors with strong RFI from HF, 6 meter or 70 cm transmitters.
Achieved results on a built Bandpass filter:
Measured results with HP8753ES network analyzer full two port calibrated.
Measured Return Loss – S11 (CH 1) and Insertion Loss – S21 (CH 2). Characteristics of 144 MHz Transmitting Bandpass filter.
Feel free to send e-mail if you need something more specific.
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