2m 144-148MHz 100W Receive Transmit Bandpass Filter Low Loss

2m 144-148MHz 100W Receive Transmit Bandpass Filter is intended for use with transceivers and transverters up to 100W output, or before any wideband low-noise amplifier (LNA) to protect from out-of-band signals. This filter is highly effective for both transmitting and receiving, offering an exceptionally low loss of just 0.15 dB. It successfully suppresses signals from HF stations within the ranges of 1.8 – 28 MHz, 50 – 54 MHz, and 70 cm. Additionally, the filter helps minimize television interference (TVI) and issues caused by neighbors with strong HF, 6m, or 70 cm transmitters.

 

2m 144-148 MHz 100W Receive Transmit Bandpass Filter Appearance:

 

Achieved results on a built 2m 144-148MHz 100W Receive Transmit BPF:

1.82 MHz -110 dB
3.8 MHz -109 dB
7.1 MHz -105 dB
14.15 MHz – 90dB
21.2 MHz -81 dB
28.4 MHz -72 dB
50 MHz -56 dB
54 MHz -53 dB
70.2 MHz -44 dB
88 MHz -34 dB
108 MHz -22 dB
144 MHz -0.15 dB
145 MHz -0.15 dB
146 MHz -0.15 dB
148 MHz -0.15 dB
288 MHz -34 dB
296 MHz -36 dB
430 MHz -51 dB
432 MHz -52 dB
440 MHz -53 dB
Maximum power input at SWR: 1:1 = 100 W; 1:1.5 = 85 W; 1:2 = 75 W; 1:3 = 65 W
These excellent results were achieved by carefully selecting components and designing the filter.

 

Measured Return Loss (S11) and Insertion Loss (S21).

 

Measured HF Attenuation on 2m 144-148 MHz 100W Receive Transmit Bandpass Filter

 

HF and 50 MHz band attenuation 2m 144-148 MHz 100W Filter:

 

FM attenuation:

 

2m 144-148 MHz 100W Bandpass Filter flatness on a 2-meter band

Attenuation on 144 MHz: -0.15 dB, 145 MHz: -0.15 dB, 146 MHz: -0.15 dB, 148 MHz: -0.15 dB.

 

2m 144-148 MHz 100W Bandpass Filter Harmonic and UHF attenuation.

 

By ordering the 2m 144-148 MHz 100W Receive Transmit Bandpass Filter, UHF Attenuation could be used with outdoor mounting; price difference: +12 EUR

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