Airframes Custom-Tune 910.525 MHz Filter

Airframes | Part: Custom Tune

Bandpass cavity filter with ~8.5MHz passband with SMA input/output

Comments from the Austin Mesh Community

The airframes was the first robust cavity filter to the mesh market, so it gained a lot of popularity. They're fine filters, but the lead times tend to be long and they're rarely in stock. Tuning them isn't hard if you know how to use a VNA, but it's also not _easy_. The unit we tested here was custom tuned for the MeshCore US Default config.

Specs

Brand

Airframes

Part Number

Custom Tune

Filter Type

Bandpass

Connectors

2x SMA Female

Loss at Meshtastic (906.875 MHz)

3.89 dB

Loss at MeshCore (910.525 MHz)

1.81 dB

Return Loss at Meshtastic

6.9 dB

Return Loss at MeshCore

12.4 dB

3 dB Passband

906.3-914.9 MHz (8.5 MHz)

Dimensions

108 x 103 x 31 mm

Test Results

This page collects 2-port VNA measurements of one unit of the Airframes Custom-Tune 910.525 MHz 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 906.3-914.9 MHz (8.5 MHz wide).

Test 1 (KG5HZC)

At Mesh Operating Frequencies

Meshtastic (906.875 MHz)

Loss: 3.89 dB

Return loss: 6.9 dB

MeshCore (910.525 MHz)

Loss: 1.81 dB

Return loss: 12.4 dB

3 dB passband: 906.3-914.9 MHz (8.5 MHz wide), minimum loss 1.80 dB at 910.84 MHz.

Out-of-Band Rejection

433 MHz (70cm ham / ISM)46.0 dB

700 MHz (LTE 700)48.2 dB

824 MHz (Cellular uplink)47.7 dB

894 MHz (Cellular downlink)49.3 dB

930 MHz (Pagers)70.6 dB

960 MHz (Fixed links)51.0 dB

1090 MHz (ADS-B)54.4 dB

Notes from test

Four-section cavity filter custom tuned to 910.525 MHz (MeshCore US). Ports are labeled INPUT and OUTPUT.

Tested By

Tommy Ekstrand, KG5HZC on 2026-07-11

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