4 meter Low Cost Low Loss Receiving Bandpass Filter for 70 MHz – 70.5 MHz.
Small, compact band-pass filter that will suppress RFI.
Achieved results on a built Bandpass filter:
1.8 MHz < -108 dB
3.8 MHz < -112 dB
7.1 MHz < -99 dB
14.15 MHz = -82 dB
21.2 MHz = -71 dB
28.4 MHz = – 62 dB
50 MHz = -35 dB
52 MHz = -32 dB
54 MHz = -28 dB
70 MHz = -0.4 dB
70.5 MHz = -0.4 dB
88 MHz= -26 dB
108 MHz= -47 dB
144 MHz = -63 dB
146 MHz = -63 dB
210 MHz = -64 dB
432.1 MHz = -51 dB
440 MHz = -49 dB
These excellent results were achieved by careful selection of components and design of the filter.
Measured data on the assembled filter with HP8753ES full 2-port calibrated are presented below. The following images show the S parameters of the most important points.
Characteristics of 70 – 70.5 MHz Band-pass filter:
Characteristics of the filter outside the receiving range:
1. Measured HF attenuation:
2. Measured HF – 50 MHz attenuation:
3. Measured VHF – 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
Direct link to all 4 meter filters. We have 50 W, 100 W, 200 W, 300 W, 1500 W and 4000 W versions: 4 Meter Band-Pass Filters
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