6m 4kW Low Loss Bandpass Filter BPF

6m 4kW Low Loss Bandpass Filter BPF
Product Code: 0625
Price: 209.00€
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50MHz 4kW Low Loss Bandpass Filter BPF

6m Bandpass Filter BPF uses high Q coils and capacitors with Q more than 4000. Low loss of filter achieved with careful design and adjustment.

Intended to be used with linear amplifiers GU78, GU84, 8877, GS35, GS31, 2x GI7B and with other tubes up to 4kW output.

For up to 1.5 kW it is not necessary to switch on cooling fan. Only for more power.

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.

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.

Although this and this RX Band-Pass filters are better for only receiving. If you could switch transmitting and receiving filter


Here are presented measured results with HP8753ES network analyzer full two port calibrated.

Return Loss (S11)

Insertion Loss (S21)



Achieved results on a built Bandpass filter:

1.8MHz=-98 dB
3.8MHz=-87 dB
7 MHz = -72 dB
14 MHz = - 53dB
28 MHz = -34 dB
50 MHz = -0.159 dB
51 MHz = -0.16 dB
88 MHz=-38dB
98 MHz = -44 dB
108 MHz = -40 dB
144 MHz = -42 dB
432 MHz = -48 dB
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.
1k5 and 4kW filters share same high quality components except connectors, fan, and different design of aluminum box.
6m 50MHz 4kW Band-Pass filter with high suppression out of band signals.
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