Settings · WSPR Web

Station

Identity

Callsign

Standard callsign only (Type 1).

Grid

4 characters are transmitted.

Power

Power at the antenna feed point.

Radio

Band and TX audio center

Default band

TX audio center mode

TX audio center (MANUAL)

Hz

Center of the four tones. Clamped to 1403–1597 Hz so every tone stays inside the 1400–1600 Hz window.

TX audio level (waveform peak)

Constant amplitude for the whole frame; no AGC or compression. The phone volume sets the acoustic level.

Clock

Transmit with an unverified clock

Allow arming when clock quality is UNSYNCED, OFFLINE or UNSAFE. The start time will then rely on the device clock or a stale correction; the transmission may miss the slot. Clock details

Receive

Spot history

Keep decoded spots on this device between sessions (IndexedDB, pruned after 7 days). Spots are never uploaded anywhere; reporting to WSPRnet is not implemented.

Radio setup

Acoustic coupling guidance

Radio mode: USB
Dial: The band's WSPR dial frequency shown on the TX screen, exactly.
Coupling: Phone speaker a few centimetres from the microphone. Keep the phone still.

Speech processor OFF, compression OFF, transmit EQ flat/OFF.
Transmit noise reduction / “noise gate” OFF where it affects TX audio.
Start with a low phone volume and low mic gain; raise until the power meter reads steadily with little or no ALC action.
A WSPR signal is a constant-amplitude tone: the meter should not bounce.

Acoustic coupling limits

Room noise, voices and handling sounds are transmitted along with the signal. Microphone processing in the transceiver can distort the tones. Menus and defaults differ between transceivers, so treat this as a starting point. A wired audio interface will give more repeatable results; it is not required for this version.

Appearance

Theme

Data

Local storage and privacy

Preferences are stored only in this browser under wspr-web.preferences (schema v4); the last clock correction under wspr-web.clock-sync. Callsign, locator, band, message and audio never leave the device. The only network request is the time endpoint, which carries no station data. No analytics, no telemetry.

Diagnostics