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6 meter Band Pass Filter 1.5 kW with Extreme Low Loss
50 MHz Band pass Filter BPF uses high Q coils and capacitors with Q more than 4000. Low loss of the 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 1.5 kW output.
Although this filter is intended to be used as a transmitting filter, its design also allows it to be used as a receiving filter. It can be used before Wide Band LNA with PGA-103+ to protect sensitive device from strong out-of-band signals.
Low Insertion loss filter is excellent to be placed before any LNA to protect the 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, and it will protect it from HF stations.
The recorded data on the assembled filter with HP8753ES 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 1500 W transmitter.
|Achieved results on build Band-pass Filter (Attenuation)
Bandwidth: 50 – 51 MHz
144 MHz / 432 MHz Band Attenuation
These excellent results were achieved by careful selection of components and design of the filter. Band Pass filter will eliminate any harmonic emission from your linear amplifier.
More measured results with HP8753ES network analyzer full two port calibrated:
1. Harmonic and FM attenuation.
2. A wide range is displayed. Here you can see 144 MHz and 432 MHz attenuation of 50 MHz 1500 W Bandpass Filter.
3. Narrower band view. Displayed frequency range: 49 MHz – 52 MHz.
1500 W and 4000 W filters share same high quality components except the connectors, the fan, and the different design of the aluminum box. Link to 4 kW Band-pass filter and a picture of both is presented down below.
High Quality Low Loss 50 – 51 MHz Bandpass Filter made for 6 Meters band designed for up to 4 kW Transmitters