Read SWR Immediately After a Tune¶
After an autotune completes, the TUNE button briefly displays the final settled SWR so you can confirm the match without looking at the SWR gauge.
Before you start¶
- A 4O3A Tuner Genius XL must be connected and detected. The TUN tray button appears on the right sidebar only when a TGXL is present.
- The Tuner applet must be open. Click the TUN tray button to open it.
- The tuner should be in OPERATE state (OPERATE button shows green).
Steps¶
- Click TUNE.
- Wait. The button turns red and reads "TUNING..." while the autotune sweep runs.
- When tuning finishes, the button restores to its normal style and briefly reads "TUNING..." for up to 400 ms while AetherSDR captures the final settled SWR value from the TGXL.
- The button then displays the result as "SWR x.xx" — for example, "SWR 1.34". Read this value directly from the button.
- After 2.5 seconds, the button label returns to "TUNE".
If you miss the flash, the SWR gauge continues to display the live TGXL-reported SWR value after tuning.
What each control does¶
| Control | Kind | Behavior | Valid range |
|---|---|---|---|
| TUNE | Button | Starts autotune. Turns red and reads "TUNING..." during the sweep. Flashes "SWR x.xx" for 2.5 s after completion. Returns to "TUNE" afterward. | — |
| SWR | Meter | Displays live TGXL-reported SWR continuously. Turns red above 2.5. | 1.0–3.0 |
Tips¶
- The 400 ms capture window after tuning=0 exists because the TGXL's final settled SWR value often arrives over TCP slightly after the tune-complete signal. The value shown on the button reflects this settled reading, not a mid-sweep sample.
- If the capture window expires before a valid SWR reading arrives, AetherSDR falls back to the last live SWR value from the gauge.
Troubleshooting¶
- The TUNE button returns to "TUNE" without showing an SWR value — The tuning state transition was not preceded by an active tune (for example, the model state changed externally). Click TUNE again to run a fresh autotune.
- The SWR gauge reads above 2.5 (red) after the tune — The tuner was unable to find a satisfactory match on the current band and antenna. Check the antenna connection and try again, or check the C1, L, and C2 relay positions.