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

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


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

SKU: 5950 Categories: ,

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

Intended to be used with linear amplifiers up to 300 W 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 devices from strong out-of-band signals.

A low Insertion loss filter is excellent for placing before any LNA to protect the receiver from HF transmitters in DX expeditions or in multi-multi environments. This BPF will suppress any harmonic on 100 MHz, 150 MHz, and more, and it will protect it from HF stations.

This Band-Pass filter is suitable for receiving as well as transmitting and works very well both ways.

The external appearance of the filter:




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

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



Achieved results on 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:


2. Measured FM and VHF attenuation:


3. Measured UHF attenuation:

Feel free to send e-mail if you need something more specific.

All band-pass filters are here: HF, VHF, and UHF Band-Pass Filters

6 Meter Band-Pass Filters  50 W, 100 W, 200 W, 300 W, 1500 W, 4000W and 5000W


Weight 1,00000000 kg


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