NIL HEARDRECEPTION LOG

NAU US Navy Puerto Rico, continuous FSK

tier A · carrier

10151.5 kHz USB · 2026-09-26 15:48:37Z · 10:00 · received at BIRMINGHAM, ALABAMA, USA

Spectrogram of NAU US Navy Puerto Rico, continuous FSK, 10151.5 kHz USB, 2026-09-26 15:48:37Z, 10:00: carrier 70% · keyed-tone 30% · tone 680 Hz · keying 0.50 Hz depth 0.70
spectrogram 0–6.0 kHz · analysis blocks: keyed-tone carrier
loop [ ] · speed in the player bar · deep link #t=seconds ⤓ FLAC 10.6 MB ⤓ Opus 2552 kB { }
What was heard
carrier 70% · keyed-tone 30% · tone 680 Hz · keying 0.50 Hz depth 0.70 — dominant tone 680 Hz, keyed at 0.5 Hz (depth 0.7). Machine description of the sound by the rig's classifier; it sorts, it does not certify a station.
Receiver
KiwiSDR, BIRMINGHAM, ALABAMA, USA (EM63oi) · BEVERAGE 500 feet long Combine with MLA-30+ MAG LOOP Please Check in with Call or Name. · reported SNR 26 dB — thanks to the operator. Receivers
Provenance
sha256 b34bda5cebc4f0a12c2ed0d845a3e75aae2055746ed8d23f77dcc9c1a8ee3572
source 10:00 WAV, 11999 Hz mono
kiwirecorder.py (jks-prv/kiwiclient v1.11) · rig item 2026-09-26T1548Z-10151.5-fsk-nau-10153
Heard in the record
— linked once the record exists.
Licence
CC BY 4.0 — credit NIL HEARD / Reception Log. The recording is ours; the transmission is somebody else's. Descriptions describe sound, never content — why.
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