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Support for US902-928 band

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Tested the setup with the below:
* TTGO T-Beam 868/915MHz (T22_v1.0, 20190612) - tracker (LY1XD-5)
* LILYGO TTGO 868/915MHz (T3_V1.6.1, 20210104) - iGate (LY1XD-4)

The band specifics are more in favour of direct line of sight, as most obstacles are impenetrable by the 915 MHz band (compared to 433 MHz).But maybe it will open up for users who don't have the EU433 available in their geographies.

https://aprs.fi/#!mt=roadmap&z=17&call=a%2FLY1XD-5&timerange=21600&tail=21600
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@ -11,9 +11,11 @@ You can use one of the Lora32 boards:
* TTGO T-Beam V0.7 (433MHz SX1278)
* TTGO T-Beam V1 (433MHz SX1278)
* TTGO T-Beam V1 (868/915MHz, SX1276)
This boards cost around 30 Euros, they are very cheap but perfect for an LoRa iGate.
Keep in minde: you need a 433MHz version!
These boards cost around 30 Euros, they are very cheap but perfect for an LoRa tracker/iGate.
It has been successfully tested within the **US902-928** range with compatible 868/915 MHz TTGO devices. See the configuration section below.
## Compiling and configuration
@ -37,6 +39,22 @@ The best success is to use PlatformIO (and it is the only platform where I can s
* To upload it to your board you have to do this via **Upload File System image** in PlatformIO!
* To find the 'Upload File System image' click the PlatformIO symbol (the little alien) on the left side, choos your configuration, click on 'Platform' and search for 'Upload File System image'.
### The US902-928 band
To get started with a T-Beam device working on the **US902-928** band, you need to:
* Tune the tracker frequency to the desired value from that band:
```
"lora":
{
"frequency_rx": 913880000,
"frequency_tx": 913880000,
...
}
```
* Use the same values to configure the **LoRa iGate** on the file [data/is-cfg.json](https://github.com/lora-aprs/LoRa_APRS_iGate/blob/master/data/is-cfg.json#L37).
The above example uses LoRa channel #6 (913.88MHz), but *use it at your own risk* and make sure to respect local regulations!
## LoRa iGate
Look at my other project: a [LoRa iGate](https://github.com/peterus/LoRa_APRS_iGate)