Troubleshooting
Empty windows, packer shortfalls, scan files that will not parse, SDR connection failures and plans that did not sync.
| Symptom | Likely cause & fix |
|---|---|
| Windows panel says Pick your hardware to see safe windows | No band is selected. Pin a Manufacturer / Band overlay, or import a scan. You can still print the regional whitespace. |
| No windows ≥ X MHz | Min width is higher than any gap in this band. Lower it, or zoom the spectrum to check whether the band sits in cellular spectrum. |
| Coordinate button is disabled | The packer needs a manufacturer band. Select one above. |
| Y requested, X placed — try a larger spacing | The band ran out of intermod-free room. Reduce N, widen the Channel spacing or choose a band that reaches cleaner spectrum. |
| Toast Band full when adding a row | Same cause — no room at the current spacing. |
| A row shows the ACR warning | Two of your channels are closer than a typical receiver can separate. Move one, then press Recompute. |
| Scan import: no valid data points found | The file is not one of the supported formats. Save it as a plain two-column Frequency, Amplitude CSV and retry. |
| Scan import: many lines rejected | Wrong units or an odd header. The warning names the first bad line; check that frequencies are in MHz, kHz or Hz consistently. |
| Trace limit reached (3) | Remove a trace, or accept the prompt to replace the oldest. |
| Could not connect to SDR | Only RF Explorer devices are supported, only in Chromium browsers, and only over a data-capable USB cable. Charge-only cables fail here. |
| SDR device removed | The USB connection dropped. Reconnect the cable and press Connect SDR again. |
| Imported WWB/WSM plan: Format unrecognized | Set Force format to WWB or WSM. |
| Imported plan: fall outside the selected region's allocations | The plan was made for another country. Change Region first. |
| File too large (max 1 MB) | Remove unused columns or split the CSV. |
| Plan references scan "…" after loading a plan | Plans store which scan they used, not the data. Import the same scan file again. |
| Plan saved on one device is missing on another | Both devices must be signed in to the same account and online. Reload — the toast Account data arrived means a newer copy has just come in. See Account sync. |
| Save failed — storage unavailable | The browser is blocking storage (private mode or full). Use a normal window or free up space. |
| Print view is missing the coordination table | Nothing was placed. Run Coordinate or add rows, then print again. |
Spectrum looks wrong for my country
Check Region / Regulatory Framework first — it is the single input everything else depends on. If the region is right and a channel still looks mis-labelled, compare it with the German band-plan write-up at /rf-cheatsheet/funkfrequenzen-deutschland (for DE) or your regulator's current table, and treat the regulator as the authority.
Thanks for the feedback.