50 - 51 MHz 1.5 kW Low Loss Bandpass Filter BPF

  • 50 - 51 MHz 1.5 kW Low Loss Bandpass Filter BPF

6 Meter band 1.5 kW Low Loss Bandpass Filter BPF

50 MHz Bandpass 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 VLNA with SPF-5122Z or 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.

Although this indoor and this outdoor RX Band-Pass filters are better for receiving only, this Low Loss Bandpass Filter works very well both ways.


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)

HF Band

1.8 MHz 3.5 MHz 7 MHz 14 MHz 21 MHz 28 MHz
- 75 dB - 73 dB - 70 dB - 53 dB - 44 dB - 32 dB

Bandwidth: 50 - 51 MHz

50 MHz 50.11 MHz 50.25 MHz 50.5 MHz 51 MHz
- 0.11 dB - 0.1 dB - 0.1 dB - 0.1 dB - 0.11 dB

FM attenuation

88 MHz  98 MHz  100 MHz 104 MHz 108 MHz
- 39 dB - 49 dB - 46 dB - 44 dB - 43 dB

144 MHz / 432 MHz Band Attenuation

144 MHz 146 MHz 430 MHz 440 MHz
- 45 dB - 45 dB - 69 dB  - 70 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:
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.

Corresponding VHF band-pass filters:

6 meter band, 50 MHz Economical Bandpass Receiver for Ham:50 - 51 MHz Economical, Low Loss Bandpass Filter

6 meter band, 50 MHz Receiver Bandpass for Ham:50 - 51 MHz High Selectivity, High Q, Low Loss RX Bandpass

6 meter band, 50 MHz Receiver Outdoor Bandpass:50 - 51 MHz High Selectivity High Q, Low Loss RX Bandpass - Outdoors

6 meter band, 50 MHz, 300 W Bandpass for Ham:50 - 51 MHz 300 W Low Loss Bandpass Filter

6 meter band, 50 MHz, 4000 W Bandpass for Ham:50 MHz 4000 W Low Loss Bandpass Filter

We are also making filters on all frequencies and powers. Even if we don't have an offer on our site, we may be able to make it for you. So feel free to contact us via email.

You might also like to read about our 6 meter band antennas (50 MHz):6 Meter High Gain Low Noise Antennas

  • Product Code: 0629
  • Availability: In Stock
  • 189.00€

Tags: 50MHz, 51MHz, 6m, 6meters, VHF, BandPass, RFI, Band-Pass, Filter, BPF, High, Q, Selectivity, Low, Loss, 1500W, 1.5kW, Transmitter, Field, Day, Ham, Radio