ACASOM 902-928 MHz Cavity Bandpass Filter

ACASOM | Part: UNKNOWN

Bandpass cavity filter from ~890-935MHz with SMA input/output

Comments from the Austin Mesh Community

These are fine filters, we've used them pretty extensively around the Austin Mesh network because of their relatively good cost/performance ratio. As of June 2026, they are no longer available for purchase anywhere we can find online. The band pass is pretty wide, so it will only help if you're trying to block signals from outside the US ISM band, it's useless helping prevent noise from other signals inside ISM.

Specs

Brand

ACASOM

Part Number

UNKNOWN

Filter Type

Bandpass

Connectors

2x SMA Female

Loss at Meshtastic (906.875 MHz)

0.47 dB

Loss at MeshCore (910.525 MHz)

0.52 dB

Return Loss at Meshtastic

30.6 dB

Return Loss at MeshCore

21.7 dB

3 dB Passband

889.9-939.8 MHz (50 MHz)

Dimensions

123 x 60 x 43 mm

Test Results

This page collects 2-port VNA measurements of one unit of the ACASOM 902-928 MHz Cavity Bandpass Filter, measured firsthand by the mesh community (KG5HZC). Every sweep is charted below and downloadable as a Touchstone (.s2p) file. Measured 3 dB passband is 889.9-939.8 MHz (50 MHz wide).

S/N 202503040183

At Mesh Operating Frequencies

Meshtastic (906.875 MHz)

Loss: 0.47 dB

Return loss: 30.6 dB

MeshCore (910.525 MHz)

Loss: 0.52 dB

Return loss: 21.7 dB

3 dB passband: 889.9-939.8 MHz (50 MHz wide), minimum loss 0.52 dB at 911 MHz.

Out-of-Band Rejection

433 MHz (70cm ham / ISM)46.2 dB

700 MHz (LTE 700)42.7 dB

824 MHz (Cellular uplink)46.1 dB

894 MHz (Cellular downlink)1.0 dB

930 MHz (Pagers)0.9 dB

960 MHz (Fixed links)43.2 dB

1090 MHz (ADS-B)47.7 dB

Notes from test

No notes available

Tested By

Tommy Ekstrand, KG5HZC on 2026-07-11

Sample 202503040183

Download .s2p (902-928 MHz, 101 points)Download .s2p (875-950 MHz, 101 points)Download .s2p (430-1500 MHz, 101 points)