The SDR radio integration brings software-defined radio capabilities directly into the SIGINT panel. It combines three sources: KiwiSDR public receivers, OpenMHz trunked radio systems, and Broadcastify scanner feeds.
KiwiSDR receivers
The KiwiSDR Receivers layer plots 500+ public software-defined radio receivers from the KiwiSDR network as amber markers on the map.
Data fetching
The backend scrapes the KiwiSDR public listing at http://kiwisdr.com/.public/ — receiver metadata is embedded as HTML comments inside each entry <div>. The scraper parses the following fields:
| Field | Description |
|---|
name | Node name (truncated to 120 characters) |
gps | Latitude and longitude |
loc | Location description (city, country) |
antenna | Antenna type description |
bands | Supported frequency bands |
users | Current active user count |
users_max | Maximum simultaneous users |
offline | Whether the node is offline (excluded if yes) |
Map display
- Receivers are displayed as clustered amber markers
- Clusters show the count of receivers in the area and decluster on zoom-in
- Clicking a marker opens the receiver’s metadata in the SIGINT panel
Live radio tuner
Clicking any KiwiSDR marker opens an embedded live radio tuner directly inside the SIGINT panel. The tuner loads the receiver’s web interface in an iframe, allowing you to tune to any frequency the node supports without leaving the dashboard.
- Node name and location
- Antenna type
- Supported frequency bands
- Current active user count vs. maximum capacity
- Direct link to open the receiver in a new tab
Receivers with low user counts relative to their maximum are more likely to be available for connection. The users / users_max values help you identify nodes with capacity.
OpenMHz trunked radio
OpenMHz provides real-time audio captures from P25 trunked radio systems — the digital radio infrastructure used by many US public safety agencies.
How it works
- The backend fetches the full directory of OpenMHz systems from
https://api.openmhz.com/systems (cached for 1 hour)
- When a user activates the radio panel, the backend finds the nearest systems by haversine distance from the user’s map center
- Recent call audio is fetched from
https://api.openmhz.com/{sys_name}/calls (cached for 20 seconds per system to limit polling rate)
- Audio bursts are returned as
.m4a URLs for playback in the SIGINT panel
Broadcastify scanner feeds
Broadcastify hosts live audio streams from thousands of public safety scanner feeds worldwide.
Top feeds
The backend scrapes the Broadcastify Top 50 live feeds page at https://www.broadcastify.com/listen/top and parses the feed table (cached for 5 minutes). Each feed entry includes:
| Field | Description |
|---|
| Feed name | Name of the radio system or channel |
| Location | State and city |
| Category | Agency type (police, fire, EMS, etc.) |
| Listener count | Current concurrent listeners |
| Stream URL | Direct CDN stream at https://broadcastify.cdnstream1.com/{feed_id} |
The KiwiSDR layer is off by default. Enable it from the Layers panel to see receiver locations on the map.