Verify RFSAM-LORA-SP-01 with real 916 MHz US915 capture

[arlethmichellopez]

Verify RFSAM-LORA-SP-01 with real 916 MHz US915 capture

Replace [FILL: ...] in ## Field case with real over-the-air measurements on US915 at Electronic Cats, Aguascalientes.

What changed

• ## Field case: added verifiable 30.0 s window (from continuous 106.6 s capture). Flat FFT vs de-chirp contrast. No other sections modified.
• Frontmatter: reviewStatus → verified, lastResearched → 2026-09-02.

Measured results

Metric	30.0 s window (reported)	Full 106.6 s session	Note
Duration	30.0 s (60M samples)	106.6 s (213M samples)	120M / 426.5M bytes @2MS/s
CSS diagonals visible	0 at a glance (2-3 faint ~1-2dB traces only at ~300kHz zoom on 916)	0	gqrx 2.17.7 11:03
Frames gr-lora_sdr CRC valid	3 (SF7 0x12, see log) / 2 strict sweep	4	SF7 0x12:2-3, SF8-12 0x12:0, SF7-12 0x34:0
Lowest SNR	~ -7.5 dB (~7-8 dB below in-channel noise)	same	PG SF7≈21.1dB, up to 20dB envelope [semtech2019longrange]
Spreading factors	SF7 only (0x12 private)	SF7 only	SF7-12 sweep

Conditions

• Location: Electronic Cats, Aguascalientes
• Frequency: 916.0 MHz (US915 902-928 MHz, 125 kHz channel)
• Antenna: stock telescopic HackRF fixed position
• Gain: -9.0 dB gqrx / hackrf_transfer -a 1 -l 32 -g 40
• Rate: 2.0 MS/s int8 I/Q
• SDR: HackRF One serial 00000000000000000930c64d295bb5c3
• Software: gqrx 2.17.7 + gr-lora_sdr (lora_RX.grc / decode_916_simple.py bw125k os16)

Evidence

lora_us916_sb2.txt
lora_916_30s.txt