50 MHz 6 meter 4 kW Low Loss Band pass Filter BPF
6 meter Band Pass Filter BPF uses high Q coils and capacitors with Q more than 4000. Low loss of filter is achieved with careful design and adjustment.
Intended to be used with linear amplifiers 8877, GS35, GS31, 2xGI7B and with other tubes up to 4 kW output.
Although intention of this filter is to be used as transmitting filter, design allows also to be used as receiving filter. It can be used before Wide Band LNA with PGA-103+ to protect sensitive device from strong out of band signals. Excellent results will be achieved before wide band SDR receivers to monitor 6 meters band.
Insertion loss is 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 harmonic on 100 MHz, 150 MHz and more + protection from HF stations.
The recorded data on the assembled filter with HP8753ES network analyzer full 2-port calibrated are presented below.
Measured Return Loss – S11 (CH 1) and Insertion Loss – S21 (CH 2). Characteristics of 50 MHz Bandpass filter for up to 4000 W transmitter.
|Achieved results on build Band-pass Filter (Attenuation)
|Bandwidth: 50 – 51 MHz
|144 MHz / 432 MHz Band Attenuation
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