CWSigFind

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Time (UTC)	Src	Call	kHz	Band	Mode	Country	Activity / Loc	Spotter	Comment

Propagation [hide]

What is this?

CWSigFind is a browser-only live aggregator of amateur-radio spots. It polls POTA, SOTA, WWFF, WWBOTA, DX cluster (via spothole.app), and RBN skimmer spots from the POTA feed — all directly from your browser.

Press ? any time to open this panel and Esc to close it.

Source freshness

POTAnever SOTAnever WWFFnever BOTAnever DXnever RBNnever

Spot sources

Each source has a chip in the header — click a chip to hide that source. The colored badge below matches what you see in the Src column. All four upstream endpoints are polled directly from your browser; they advertise Access-Control-Allow-Origin: * so no proxy is required.

POTA Parks On The Air ⚡⚡⚡ heavy

Public park activations, dominated by North America. Polled from the official REST API every 30s.

Endpoint: https://api.pota.app/spot/activator

SOTA Summits On The Air ⚡⚡ moderate

Mountain-summit activations. Strong CW culture, lots of Europe and US west-coast summits. Polled every 30s.

Endpoint: https://api2.sota.org.uk/api/spots/-1/all

WWFF Worldwide Flora & Fauna ⚡⚡⚡ heavy

Park-style activations with strong EU/UK coverage that POTA doesn't carry. Polled from the public Spotline feed every 30s (upstream-recommended minimum).

Endpoint: https://spots.wwff.co/static/spots.json

BOTA Bunkers On The Air (WWBOTA) ⚡⚡ moderate

Newer program, growing fast in Europe. Refs look like B/G-2453. Polled every 60s (upstream-recommended minimum), with the standard age=1 filter so we only see the last hour.

Endpoint: https://api.wwbota.org/spots/?age=1

DX DX cluster

Human DX spots via spothole.app (aggregated cluster telnet). IOTA / WCA refs detected from comments.

RBN Reverse Beacon Network

CW skimmer spots from the POTA activator feed when upstream tags source: RBN. Enable the RBN chip — it is off by default on CW/SSB tabs.

Activity programs

When a spot belongs to an awards program, the Activity column shows a colored badge plus the reference.

POTA — Parks On The Air. Refs: US-0916, VE-1234.
SOTA — Summits On The Air. Refs: W6/CT-001, EA3/BC-039.
WWFF — Worldwide Flora & Fauna. Refs like KFF-1234, DLFF-0093.
BOTA — Bunkers On The Air. Refs: B/G-2453.

Programs detected from DX cluster comments:

IOTA — Islands On The Air. Detected from DX-cluster comments and resolved against the weekly IOTA group catalog. (The catalog ships here too, so this lite demo will display island names if any feed ever tags one.)
WCA — World Castles Award and its national friends (DCI, DFCF). Detected from DX-cluster comment keywords.

Using the page

Filter chips

Header chips toggle each source on/off. The ALL chip is a convenience: clicking it enables every source at once. Band chips (160m…2m) further filter by band; with no band chip active, all bands are shown.

Search

Free-text filter across callsign, program, activity ref/name, country, state and comment. Live as you type.

Max spots

Caps the visible row count (20/50/100/All). The full client-side history (last 1000 spots) is kept in memory regardless.

Mode tabs

CW, SSB, and Digital tabs filter by mode. Each tab remembers its own source/band/search settings.

Map

Click Map to show activator positions (POTA coordinates, Maidenhead grid, or SOTA summit lookup). DX/RBN spots appear when a grid or coordinates are available.

Links

Callsigns link to QRZ; activity refs link to POTA/SOTA/WWFF/BOTA pages (toggle in Options).

Propagation indices

The bottom-right panel shows live space-weather indices polled directly from NOAA SWPC every 15 minutes. Hover any index in the panel for a one-line description; the longer explanations live here.

SFI — Solar Flux Index at 10.7 cm (2800 MHz), reported daily. The classic HF propagation indicator: roughly <70 quiet sun, 100–150 healthy, 200+ exceptional. Higher SFI generally means better high-band (15–10 m) propagation.
SSN — Sunspot Number, daily observed value from NOAA SWPC. Tracks the solar cycle and correlates with SFI on long time scales.
A — Planetary A-index: 24-hour averaged geomagnetic activity. 0–7 quiet, 8–15 unsettled, 16+ active. Higher A degrades HF, especially polar paths.
K — Planetary K-index: 3-hour geomagnetic activity on a 0–9 logarithmic scale. 0–2 quiet, 3–4 unsettled, 5+ stormy. Read alongside A for short-term geomagnetic state.
X-ray — GOES soft X-ray flux class (A/B/C/M/X). A and B are quiet-sun background; C is moderate; M-class can cause brief HF blackouts on the daylit side; X-class events can produce hours-long blackouts.

What the lite version doesn't show

The full Python daemon polls hamqsl.com instead of NOAA, which adds a per-band Good/Fair/Poor table (80m–40m, 30m–20m, 17m–15m, 12m–10m × day/night), plus solar wind speed, Bz, geomagnetic field state, and MUF. The lite build is index-only because hamqsl.com doesn't advertise CORS headers, so the browser can't fetch it directly.

Sources used by the lite build:

services.swpc.noaa.gov/products/summary/10cm-flux.json — SFI
services.swpc.noaa.gov/products/noaa-planetary-k-index.json — K + A
services.swpc.noaa.gov/json/goes/primary/xrays-7-day.json — X-ray class
services.swpc.noaa.gov/json/solar-cycle/swpc_observed_ssn.json — daily SSN

Tips

CWT mini-tests

The CWops weekly CW sprints (Wed 1300/1900Z, Thu 0300/0700Z) cluster within ±5 kHz of a fixed set of frequencies. For a real-time CWT activity board you want the RBN firehose, which is only available in the full Python version.

Polling rates

POTA / SOTA / WWFF poll every 30 seconds; WWBOTA every 60s. On error, each source backs off exponentially (up to 5 minutes) without affecting the others.

State across refreshes

The lite demo remembers your max-spots choice, source/band chip selections, and whether you've dismissed the banner. Everything else is rebuilt fresh on load — there's no server-side history.

Desktop SignalFind

For Hamlib radio control (click-to-tune), audio waterfall, direct telnet DX cluster / RBN, and hamqsl.com propagation tables, use the SignalFind desktop daemon.