meshtastic/docs/settings/channel-advanced.mdx
Sacha Weatherstone 9dc879235f
Hardware pages (#299)
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Co-authored-by: Foster Irwin <foster@jfirwin.com>
Co-authored-by: Sacha Weatherstone <sachaw100@hotmail..om>
2022-04-02 00:34:49 +11:00

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---
id: channel-advanced
title: Channel Settings - Advanced
sidebar_label: Channel
---
import Tabs from '@theme/Tabs';
import TabItem from '@theme/TabItem';
:::warning
These settings are for advanced users only. If you don't know what you are doing you could damage your radio or break local radio laws. Proceed with caution.
:::
## Overview
Most users should not need to change these settings. The default [modem_config](channel#modem_config) settings should work just fine.
## Settings
| Setting | Acceptable Values | Default |
| :--------------: | :------------------------------------------------------------------------------------------------: | :---------------------------: |
| bandwidth | `10.4`, `15.6`, `20.8`, `31.25`, `41.7`, `62.5`, `125`, `250`, `500` | `125` |
| channel_num | Depends on Region | Region Channel Number Default |
| coding_rate | `5`, `6`, `7`, `8` | `5` |
| frequency_offset | real numbers | `0` |
| spread_factor | `7`, `8`, `9`, `10`, `11`, `12` | `7` |
| tx_power | `0`, `2`, `3`, `4`, `5`, `6`, `7`, `8`, `9`, `10`, `11`, `12`, `13`, `14`, `15`, `16`, `17`, (dBm) | `0` |
### bandwidth
Total amount of spectrum used for the transmission.
#### Set Bandwidth
<Tabs
groupId="settings"
defaultValue="cli"
values={[
{label: 'CLI', value: 'cli'},
{label: 'Android', value: 'android'},
{label: 'iOS', value: 'iOS'},
{label: 'Web', value: 'web'},
]}>
<TabItem value="cli">
```shell
meshtastic --ch-set bandwidth 125 --ch-index 0
```
</TabItem>
<TabItem value="android">
:::info
Configuring this setting is not yet available for the selected platform. If this is incorrect please update the documentation for this page.
:::
</TabItem>
<TabItem value="iOS">
:::info
Configuring this setting is not yet available for the selected platform. If this is incorrect please update the documentation for this page.
:::
</TabItem>
<TabItem value="web">
:::info
Configuring this setting is not yet available for the selected platform. If this is incorrect please update the documentation for this page.
:::
</TabItem>
</Tabs>
### channel_num
An abstraction that maps to a specific center frequency used for transmission.
#### Set Channel Number
<Tabs
groupId="settings"
defaultValue="cli"
values={[
{label: 'CLI', value: 'cli'},
{label: 'Android', value: 'android'},
{label: 'iOS', value: 'iOS'},
{label: 'Web', value: 'web'},
]}>
<TabItem value="cli">
:::info
Configuring this setting is not yet available for the selected platform. If this is incorrect please update the documentation for this page.
:::
</TabItem>
<TabItem value="android">
:::info
Configuring this setting is not yet available for the selected platform. If this is incorrect please update the documentation for this page.
:::
</TabItem>
<TabItem value="iOS">
:::info
Configuring this setting is not yet available for the selected platform. If this is incorrect please update the documentation for this page.
:::
</TabItem>
<TabItem value="web">
:::info
Configuring this setting is not yet available for the selected platform. If this is incorrect please update the documentation for this page.
:::
</TabItem>
</Tabs>
### coding_rate
The amount of forward error correction applied to allow for us to automatically repair errors in the data transmission.
#### Set Coding Rate
<Tabs
groupId="settings"
defaultValue="cli"
values={[
{label: 'CLI', value: 'cli'},
{label: 'Android', value: 'android'},
{label: 'iOS', value: 'iOS'},
{label: 'Web', value: 'web'},
]}>
<TabItem value="cli">
```shell
meshtastic --ch-set coding_rate 8 --ch-index 0
```
</TabItem>
<TabItem value="android">
:::info
Configuring this setting is not yet available for the selected platform. If this is incorrect please update the documentation for this page.
:::
</TabItem>
<TabItem value="iOS">
:::info
Configuring this setting is not yet available for the selected platform. If this is incorrect please update the documentation for this page.
:::
</TabItem>
<TabItem value="web">
:::info
Configuring this setting is not yet available for the selected platform. If this is incorrect please update the documentation for this page.
:::
</TabItem>
</Tabs>
### frequency_offset
This parameter is for advanced users with advanced test equipment, we do not recommend most users use it. A frequency offset that is added to to the calculated band center frequency. Used to correct for crystal calibration errors.
#### Configure frequency_offset
<Tabs
groupId="settings"
defaultValue="cli"
values={[
{label: 'CLI', value: 'cli'},
{label: 'Android', value: 'android'},
{label: 'iOS', value: 'iOS'},
{label: 'Web', value: 'web'},
]}>
<TabItem value="cli">
:::info
Configuring this setting is not yet available for the selected platform. If this is incorrect please update the documentation for this page.
:::
</TabItem>
<TabItem value="android">
:::info
Configuring this setting is not yet available for the selected platform. If this is incorrect please update the documentation for this page.
:::
</TabItem>
<TabItem value="iOS">
:::info
Configuring this setting is not yet available for the selected platform. If this is incorrect please update the documentation for this page.
:::
</TabItem>
<TabItem value="web">
:::info
Configuring this setting is not yet available for the selected platform. If this is incorrect please update the documentation for this page.
:::
</TabItem>
</Tabs>
### spread_factor
LoRa is a spread spectrum technology. spread_factor is how much the signal is spread over the spectrum. SF8 = 2^8 or spread 256 times. SF12 = 2^12 or spread 4096 times.
#### Set Spread Factor
<Tabs
groupId="settings"
defaultValue="cli"
values={[
{label: 'CLI', value: 'cli'},
{label: 'Android', value: 'android'},
{label: 'iOS', value: 'iOS'},
{label: 'Web', value: 'web'},
]}>
<TabItem value="cli">
```shell
meshtastic --ch-set spread_factor 12 --ch-index 0
```
</TabItem>
<TabItem value="android">
:::info
Configuring this setting is not yet available for the selected platform. If this is incorrect please update the documentation for this page.
:::
</TabItem>
<TabItem value="iOS">
:::info
Configuring this setting is not yet available for the selected platform. If this is incorrect please update the documentation for this page.
:::
</TabItem>
<TabItem value="web">
:::info
Configuring this setting is not yet available for the selected platform. If this is incorrect please update the documentation for this page.
:::
</TabItem>
</Tabs>
### tx_power
Configured transmit power out of the LoRa radio, measured in dBM. Setting this to `0` will use the device default which is the max legal continuous power for your region.
:::caution
Ensure that you are not exceeding your country's regulations.
`Country regulation - antenna gain = tx_power max setting`
:::
#### Set TX Power
<Tabs
groupId="settings"
defaultValue="cli"
values={[
{label: 'CLI', value: 'cli'},
{label: 'Android', value: 'android'},
{label: 'iOS', value: 'iOS'},
{label: 'Web', value: 'web'},
]}>
<TabItem value="cli">
```shell title="Set Default"
meshtastic --ch-set tx_power 0 --ch-index 0
```
```shell title="Set to 2dBM"
meshtastic --ch-set tx_power 2 --ch-index 0
```
</TabItem>
<TabItem value="android">
:::info
Configuring this setting is not yet available for the selected platform. If this is incorrect please update the documentation for this page.
:::
</TabItem>
<TabItem value="iOS">
:::info
Configuring this setting is not yet available for the selected platform. If this is incorrect please update the documentation for this page.
:::
</TabItem>
<TabItem value="web">
:::info
Configuring this setting is not yet available for the selected platform. If this is incorrect please update the documentation for this page.
:::
</TabItem>
</Tabs>