Offset / Gap Finder
The Offset Updater (a.k.a. Gap Finder) automatically moves your transmit audio offset to a clear part of the passband before replying, so you don't transmit on top of another station.
What it does
While monitoring, Wait and Pounce watches which audio frequencies are already in use (it collects the offsets of incoming decodes). When it's about to reply, it picks a gap — an unused slot — and sends a Set TX Delta Frequency packet to WSJT-X so your transmission lands there.
Settings
In Settings → Offset Updater:
| Setting | Meaning |
|---|---|
| Enable frequencies offset updater | Turn the gap finder on/off. |
| Mode selector (Normal / Fox-Hound / SuperFox / Custom) | Which operating mode's frequency range to use. |
| Min Freq (Hz) / Max Freq (Hz) | The passband window to search for gaps (0–10000). |
The default windows match WSJT-X conventions:
| Mode | Default range |
|---|---|
| Regular | 200 – 2900 Hz |
| Fox/Hound | from 1050 Hz |
| SuperFox | up to 3200 Hz |
| Custom | your Min/Max values |
Custom ranges
Choosing Custom lets you define and save your own Min/Max offsets — useful if your station has a restricted clean passband or you want to keep replies inside a specific sub-band.
When it runs
The frequency is set at reply time, just before the Reply packet is sent. If the gap finder is disabled, Wait and Pounce leaves your TX offset untouched and WSJT-X behaves normally.
Fox/Hound and SuperFox
For DXpeditions running Fox/Hound or SuperFox, pick the matching mode so the gap finder searches the correct hound passband instead of the regular one.