NIL HEARDRECEPTION LOG

NSS US Navy Annapolis, continuous FSK

tier A · mixed

12013.5 kHz USB · 2026-09-21 16:51:57Z · 10:00 · received at BIRMINGHAM, ALABAMA, USA

Spectrogram of NSS US Navy Annapolis, continuous FSK, 12013.5 kHz USB, 2026-09-21 16:51:57Z, 10:00: mixed 100%
spectrogram 0–6.0 kHz · analysis blocks: mixed
loop [ ] · speed in the player bar · deep link #t=seconds ⤓ FLAC 10.5 MB ⤓ Opus 2497 kB { }
What was heard
mixed 100%. 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 /Low Pass Filter/Band Pass Filter/ A lot of ferrite Core. Linear Power supply. Do not use switching power supply. Ever. · reported SNR 25 dB — thanks to the operator. Receivers
Provenance
sha256 12ea7cbb34ded1bc2a1271362476db23106811bcfa3a7dd35b9626e3401aa54a
source 10:00 WAV, 11999 Hz mono
kiwirecorder.py (jks-prv/kiwiclient v1.11) · rig item 2026-09-21T1651Z-12013.5-fsk-nss-12015
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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