Find free windows and coordinate channels

A free window is a stretch of spectrum the region's rules allow and nothing blocks: no mobile band, no guard band, no protected range and — once you have imported a scan — nothing above the noise threshold. The packer then places your channels inside the allowed spectrum.

A window is free in what FreqSense knows. It does not know which local TV transmitters are on air; only a scan shows that. Bring one before you trust a window — see Import a scan.

Find the windows

1. Set the Region and pick a Manufacturer / Band. Until you do, the windows panel (Free Coordination Windows on screen) shows Pick your hardware to see free windows; you can still print the regional whitespace on its own.
2. Set Min width (MHz) to the smallest gap worth your time. If nothing is left, the panel says No windows ≥ X MHz. Lower the minimum width.
3. Sort Widest first (default) or Frequency ↑.
4. Each card shows the range and width, a Free badge, ≤ n ch @ … kHz — how many channels fit at the chosen spacing — and up to five suggested frequencies: on the 25 kHz raster and clean against the plan you already have. Where the rule for that spectrum ends, a ↓ date chip shows when (in Germany, for example, the end of 2030 for 470–698 MHz). Click a card to highlight the window on the spectrum.
5. Press ↓ CSV to export the window list, suggestions included.

Windows only exist inside the ranges the region's rules allow. Where the tool has no data it suggests nothing, rather than offering a mobile band as free.

Coordinate the channels

1. In Coordinate N Channels, set N (channels) — 1 to 64 — and the Channel spacing: 200, 400 or 800 kHz minimum between your channels.
2. Press Coordinate. The status line reads X of Y placed. If it reads … try a larger spacing, the band ran out of room; widen the spacing or reduce N.
3. Fill Talent, set the Role — Mic (a receiver) or IEM (a transmitter) — and Power (dBm) for each row.
4. + Add row adds one channel: the lowest raster frequency in the selected band that is clean against every row and outside blocked spectrum. The toast Band full means there is no room at this spacing.
5. × deletes a row. Recompute re-packs the selected band. Clear empties the table — the toast offers Undo.

Every frequency sits on the 25 kHz raster, in the region's allowed spectrum, and is clean against the 3rd-order (2A−B and A+B−C, two and three transmitters) and 5th-order (3A−2B) products of the whole plan — including a product that lands exactly on a channel. Evenly spaced frequencies are the worst case for intermod; the packer never produces them.

After every change the plan check runs over every row.

Several bands in one plan

A show rarely runs on one band. Mics on one range and in-ears on another go into the same table:

1. Pick the first band, set N, press Coordinate.
2. Pick the second band (say, your IEM band), set N, press Coordinate again.

The second band's channels are placed clean against the first band's rows — mic ↔ IEM intermod included — and the first band's rows do not move. Re-coordinating a band re-packs only that band's rows; the others stay put and count as carriers the new frequencies must avoid. Each row shows its gear under the talent name, and names stay with their gear: if a re-pack leaves fewer slots than named rows, a toast lists the names that lost their row (Lost: …) and stays until you close it.

Backups

Under the table, Backups sets how many spare frequencies to keep for the selected band (0–8). They appear as chips: frequencies in that band, clean against every row in the plan. One goes live at a time — a backup replaces a channel that went bad, it is not an extra channel. No clean backup left in this band means the band is full. Backups print with the plan.

Check intermod by hand

The Intermod Calculator takes any list of frequencies and TX powers — useful for gear FreqSense did not coordinate:

• Enter at least two frequencies (in MHz) and a power per source (in dBm). Press + Add for more rows, Clear to start again.
• 3rd-order products are always computed, including the three-transmitter A+B−C family. Tick Include 5th-order to add the 2A+B−2C and 3A−2B families.
• A product landing on one of your frequencies is marked on carrier ….
• Hide products below −90 dBm trims the list to products that could plausibly reach a receiver.
• Products are marked with an arrow on the spectrum; the header says how many.