Documentation Index
Fetch the complete documentation index at: https://mintlify.com/anfegomezver/spectrum24ghz/llms.txt
Use this file to discover all available pages before exploring further.
The Canales tab (tab index 1) gives you a bird’s-eye view of how 2.4 GHz spectrum is being consumed across every channel in the band. Rather than showing individual networks, it groups all discovered access points by their channel and visualises congestion as a saturation percentage. This makes it easy to spot crowded channels and identify clear frequencies before deploying a new access point or changing an existing one’s channel.
Channel List Construction
The full list of 13 channels is built once at startup in buildAllChannels() and never destroyed — only the networks list inside each WifiChannel is cleared and repopulated after every scan.
private List<WifiChannel> buildAllChannels() {
List<WifiChannel> list = new ArrayList<>();
for (int ch = 1; ch <= 13; ch++) {
int freq = 2407 + ch * 5;
list.add(new WifiChannel(ch, freq, "Universal", false, ch == 1 || ch == 6 || ch == 11));
}
return list;
}
isPrime = true. These are the three non-overlapping channels in the 2.4 GHz band — they do not interfere with each other when used at standard 20 MHz width, making them the universally recommended choices for wireless deployments.
Channel Frequency Reference
Each channel’s centre frequency is fixed by the formula 2407 + channel × 5 MHz:
| Channel | Frequency (MHz) | isPrime |
|---|
| 1 | 2412 | ✓ |
| 2 | 2417 | |
| 3 | 2422 | |
| 4 | 2427 | |
| 5 | 2432 | |
| 6 | 2437 | ✓ |
| 7 | 2442 | |
| 8 | 2447 | |
| 9 | 2452 | |
| 10 | 2457 | |
| 11 | 2462 | ✓ |
| 12 | 2467 | |
| 13 | 2472 | |
buildAllChannels() — it is only legal in Japan and extremely rare in practice.
Channel Card Layout
The ChannelListAdapter binds each WifiChannel to a card showing:
- Channel number badge — a colored circular badge (tinted to match saturation level).
- “Canal N” — channel label.
- Frequency in MHz — e.g.
2437 MHz.
- Network count —
"Sin redes" (0), "1 red" (1), or "N redes" (2+).
- Saturation percentage — e.g.
Saturación: 50%, colored by tier.
Saturation is calculated with a simple linear scale capped at 100 %:
int saturation = Math.min(count * 25, 100);
| Networks on channel | Saturation |
|---|
| 0 | 0 % |
| 1 | 25 % |
| 2 | 50 % |
| 3 | 75 % |
| 4 or more | 100 % |
Saturation Color Coding
The saturation percentage determines the color of both the channel badge and the saturation label text:
| Saturation Range | Color Token | Meaning |
|---|
| 0 % | sig_strong (green) | Empty — ideal |
| 1 %–30 % | sig_strong (green) | Low — recommended |
| 31 %–60 % | sig_medium (yellow/orange) | Moderate — stable |
| > 60 % | sig_weak (red) | High — congested |
if (saturation == 0 || saturation <= 30) {
satColorRes = R.color.sig_strong;
} else if (saturation <= 60) {
satColorRes = R.color.sig_medium;
} else {
satColorRes = R.color.sig_weak;
}
Channel Detail Dialog
Tapping any channel card calls showChannelDetailsDialog(WifiChannel ch), which opens an AlertDialog containing:
| Field | Content |
|---|
| Frecuencia | Centre frequency in MHz |
| Saturación | Percentage value and status label |
| Redes Detectadas | Total network count on this channel |
| Listado de Redes | Each SSID with its RSSI in dBm |
populateNetworks().
Status Labels
The status label shown inside the detail dialog is derived from the same saturation thresholds used for color coding:
| Saturation | Status label |
|---|
| 0 % | Libre / Óptimo |
| 1 %–30 % | Bajo / Recomendado |
| 31 %–60 % | Medio / Estable |
| > 60 % | Crítico / Saturado |
The WifiChannel Model
public class WifiChannel {
private final int channel; // 1–13
private final int frequencyMhz; // Centre frequency, e.g. 2437
private final String regionLabel; // Always "Universal" for ch 1–13
private final boolean isRestricted; // Always false for ch 1–13
private final boolean isPrime; // true for ch 1, 6, 11
private final List<ScannedNetwork> networks; // Populated after each scan
}
networks list is cleared at the start of every scan and re-populated by populateNetworks(), which assigns each ScannedNetwork to the WifiChannel whose channel number matches the result of frecuenciaACanal(frequency).
For a new access point or router, always select channel 1, 6, or 11. These three non-overlapping channels are the only ones in the 2.4 GHz band that do not interfere with each other at standard 20 MHz width. Choosing any other channel means your AP will partially overlap with neighbouring channels on both sides, increasing co-channel interference. Look for the channel showing Libre / Óptimo or Bajo / Recomendado in green.