Analysis of the Aliexpress FBP-144 BPF for the 2m band

Date: September 24, 2022

This filter can be bought from this store.

The measurement was done using a calibrated LiteVNA-64.

FBP-144 measurement setup

Analysis results

FBP-144 measurement (SWR, Log) sweep

Paramers derived from the NanoVNASaver bandpass analyser.

Characteristics

Center frequency: 147.05MHz
Bandwidth (-3 dB): 33.15MHz
Bandwidth (-6 dB): 40.20MHz
Quality Factor: 4.4

Lower Side

Cutoff frequency: 131.41 MHz (-3.1dB)
-6 dB point: 128.75 MHz
-60 dB point: Not measureable
Roll-off: 118 dB/ octave
Roll-off: 393 dB / decade

Upper Side

Cutoff frequency: 164.55MHz (-3.1dB)
-6 dB point: 168.94MHz
-60 dB point: 266.66 MHz (derived)
Roll-off: 81 dB / octave
Roll-off: 270 dB / decade

S1P File

For her Investigation you can have a look at the S1P files:

FBP-144 Sweep from 100-200MHz

This files can be investigated using NanoVNASaver.