50 - 51 MHz 300 W Low Loss Band-pass Filter for 6 Meter Band

  • 50 - 51 MHz 300 W Low Loss Band-pass Filter for 6 Meter Band

6 Meter 300 W Low Loss Bandpass Filter BPF

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 300 W output.

Although this filter is intended to be used as a transmitting filter, its design also allows is 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 receiving, this 300 W Low Loss Bandpass Filter works very well both ways.

External appearance of the filter:

6-meters-50-MHz-300-W-Band-Pass-Filter-Made-By-antennas-amplifiers.com

The recorded data on the assembled filter with HP8753ES full 2-port calibrated are presented below.

Measured Return Loss (S11) and Insertion Loss (S21). Characteristics of 50 MHz Bandpass filter for up to 300 W transmitter.

6-meters-50-MHz-300W-Bandpass-Filter-Made-By-antennas-amplifiers.com


Achieved results on build Band-pass Filter (Attenuation)

HF Band

1.8 MHz 3.5 MHz 7 MHz 14 MHz 21 MHz 28 MHz
- 100 dB - 92 dB - 74 dB - 56 dB - 47 dB - 38 dB

Bandwidth: 50 - 51 MHz

50 MHz 50.11 MHz 50.25 MHz 50.5 MHz 51 MHz
- 0.15 dB - 0.15 dB - 0.15 dB - 0.15 dB - 0.15 dB

FM attenuation

88 MHz  98 MHz  100 MHz 104 MHz 108 MHz
- 33 dB - 44 dB - 42 dB - 40 dB - 38 dB

144 MHz / 432 MHz Band Attenuation

144 MHz 146 MHz 430 MHz 440 MHz
- 40 dB - 40 dB - 46 dB  - 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:

1. Measured HF attenuation:
6-meters-50-MHz-300W-Bandpass-Filter-HF-Attenuation-Made-By-antennas-amplifiers.com
2. Measured FM and VHF attenuation:
6-meters-50-MHz-300W-Bandpass-Filter-FM-VHF-Attenuation-Made-By-Antennas-Amplifiers
3. Measured UHF attenuation:
6-meters-50-MHz-300W-Bandpass-Filter-FM-VHF-Attenuation-Made-By-Antennas-Amplifiers
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, 1500 W Bandpass for Ham: 50 - 51 MHz 1500W Low Loss Bandpass Filter

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


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


  • Product Code: 0627
  • Availability: In Stock
  • 169.00€


Tags: 50MHz, 51MHz, 6m, 6meters, VHF, BandPass, RFI, Band-Pass, Filter, BPF, High, Q, Selectivity, Low, Loss, 300W, Transmitting, Field, Day, Ham, Radio