NIL HEARDRECEPTION LOG

WWV time signal, 20 MHz (day)

tier A · keyed-tone

20000 kHz AM · 2026-09-24 20:29:09Z · 03:06 · received at BIRMINGHAM, ALABAMA, USA

Spectrogram of WWV time signal, 20 MHz (day), 20000 kHz AM, 2026-09-24 20:29:09Z, 03:06: keyed-tone 90% · carrier 10% · tone 300 Hz · keying 1.00 Hz depth 0.96
spectrogram 0–6.0 kHz · analysis blocks: keyed-tone carrier
loop [ ] · speed in the player bar · deep link #t=seconds ⤓ FLAC 3.2 MB ⤓ Opus 717 kB { }
What was heard
keyed-tone 90% · carrier 10% · tone 300 Hz · keying 1.00 Hz depth 0.96 — dominant tone 300 Hz, keyed at 1.0 Hz (depth 0.96). 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 0d79ecc89b4a4fecbd00ec628b1a1a3f94584a6b434c4fa9b4fd3c2ed61cbe4d
source 03:06 WAV, 11999 Hz mono
kiwirecorder.py (jks-prv/kiwiclient v1.11) · rig item 2026-09-24T2029Z-20000-wwv-20000
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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