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GPIO Labs 915 MHz Low-Pass Filter
GPIO Labs | Part: UNKNOWN
Tiny low pass filter for 915MHz
Comments from the Austin Mesh Community
I have no idea what this is blocking, my VNA won't go any higher and this doesn't seem to block anything below that. Also has a pretty poor impedance match.
Specs
Brand
GPIO Labs
Part Number
UNKNOWN
Filter Type
Low-pass
Connectors
SMA Male + SMA Female
Loss at Meshtastic (906.875 MHz)
0.33 dB
Loss at MeshCore (910.525 MHz)
0.30 dB
Return Loss at Meshtastic
21.5 dB
Return Loss at MeshCore
22.0 dB
3 dB Passband
N/A
Dimensions
38 x 8 x 8 mm
Test Results
This page collects 2-port VNA measurements of one unit of the GPIO Labs 915 MHz Low-Pass Filter, measured firsthand by the mesh community (KG5HZC). Every sweep is charted below and downloadable as a Touchstone (.s2p) file.
Test 1 (KG5HZC)
At Mesh Operating Frequencies
Meshtastic (906.875 MHz)
Loss: 0.33 dB
Return loss: 21.5 dB
MeshCore (910.525 MHz)
Loss: 0.30 dB
Return loss: 22.0 dB
Out-of-Band Rejection
433 MHz (70cm ham / ISM)0.0 dB
700 MHz (LTE 700)1.3 dB
824 MHz (Cellular uplink)1.0 dB
894 MHz (Cellular downlink)0.4 dB
930 MHz (Pagers)0.3 dB
960 MHz (Fixed links)0.1 dB
1090 MHz (ADS-B)0.0 dB
Notes from test
Passes everything I measured up through 1500 MHz(max of my VNA.
Tested By
Tommy Ekstrand, KG5HZC on 2026-07-11