144 MHz – 146 MHz 50 W Low Loss Receiving and Transmitting Band Pass Filter for 2 meter Band
Intended for use with transceivers and transverters up to 50 W output, or before any wide band low noise amplifier (LNA) to protect from out of band signals.
This filter is equally good as transmitting and as receiving filter with super low loss (0.19 dB).
Super low insertion loss. Excellent to put before any LNA or protect receiver from HF, 6m, 4m or 70cm transmitters. This band-pass filter will suppress any signals from HF 1.8 – 28MHz stations 50-54MHz, 70MHz, 432MHz (430 – 440MHz).
Filter will reduce TVI problem too.
Achieved results on a built Bandpass filter:
Insertion loss:
1.8 MHz – 110 dB
3.8 MHz – 113 dB
7.1 MHz – 108 dB
14.15 MHz – 97 dB
21.2 MHz – 88 dB
28.4 MHz – 82 dB
50 MHz – 63 dB
54 MHz – 61 dB
70 MHz – 51 dB
70.5 MHz – 51 dB
88 MHz – 40 dB
98 MHz – 34 dB
108 MHz – 26 dB
144 – 146 MHz – 0.19 dB
288 MHz – 49 dB
430 MHz – 60 dB
432.1 MHz – 60 dB
440 MHz – 59 dB
Maximum power input at SWR:
1:1 = 50 W; 1:1.5 = 40 W; 1:2 = 30 W; 1:3 = 25 W
These excellent results were achieved by careful selection of components and design of the filter.
Measured Return Loss (S11) and Insertion Loss (S21).
More measured results with HP8753ES network analyzer full two port calibrated.
1. Measured HF Attenuation:
2. HF and 50 MHz band attenuation:
3. FM attenuation:
4. 144 – 146 MHz band attenuation. Excellent flatness on 2 meters band. Attenuation on 144 MHz: -0.19 dB, 145 MHz: -0.19 dB, 146 MHz: -0.19 dB, 148 MHz: -0.19 dB.
5. Harmonic and UHF attenuation.
2 meter: 144, 145, 146 MHz 50 W Band-Pass filter with high suppression for out of band signals.
50W transmitting and receiving band-pass filter could be used for outdoor mounting. Price difference: +7 EUR (plastic box “DB” and bracket).
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 2 meter filters. We have 50 W, 100 W, 200 W, 300 W, 1500 W and 4000 W versions: 2 Meter Band-Pass Filters
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