# Mid Testing

Sydney is currently split into two distinct and incompatable[^bridges] radio settings.

* **Narrow**: This is primarily used in the Northeast Sydney and Newcastle
* **Wide**: This is used in Western Sydney, Southwest Sydney, and the Blue Mountains.

There is a new setting that is being tested by several people dubbed "Mid".

| Name      |     MHz |    BW | SF | CR |
| --------- | -------:| -----:| --:| --:|
| Mid       | 915.075 | 125.0 |  9 |  5 |
| MidNarrow | 915.075 |  62.5 |  7 |  8 |

Problems that are trying to be solved:

1. Sit at the bottom of the AU ISM Band and avoid conflicts with [LoRaWAN](https://www.thethingsnetwork.org/country/australia/) gear (which starts at 915.200 MHz).
2. More speed benefits closer to Narrow; by increasing the Bandwidth
3. Distance benefits of Wide; Western Sydney has a sparse node distribution with long distance links.
4. Find common settings that the whole Sydney Mesh can agree upon to resolve the Wide/Narrow split.

## Testing

If you want to temporarily test these settings on a router:

```
tempradio {freq},{bw},{sf},{cr},{minutes}
tempradio 915.075,125,9,5,120
tempradio 915.075,62.5,7,8,1440
```

This changes a repeater to the mid settings for 120 mins. It will revert to the previously configured settings after 2 hours or if the repeater is rebooted.


[^bridges]: Bridges allow traffic across the boundries