Gateway performance

Gateways Raspberry Pi Gateways
1

I have a gateway based on the iMST iC880a. I think think the performance is not so good. Strange thing is that some nodes occasionally send data over another gateway that is 2,3km away. Here is some data from a node that is attached to the side of a building (the gateway is on top of the same building):

{
“time”: “2020-10-07T13:27:09.614751129Z”,
“frequency”: 868.5,
“modulation”: “LORA”,
“data_rate”: “SF8BW125”,
“coding_rate”: “4/5”,
“gateways”: [
{
“gtw_id”: “remote-gateway”,
“gtw_trusted”: true,
“timestamp”: 3584583308,
“time”: “”,
“channel”: 2,
“rssi”: -114,
“snr”: -11,
“rf_chain”: 1,
“altitude”: 50
},
{
“gtw_id”: “my-gateway”,
“timestamp”: 1943727940,
“time”: “2020-10-07T13:27:09.598253Z”,
“channel”: 2,
“rssi”: -117,
“snr”: 1,
“altitude”: 34
}
]
}

{
“time”: “2020-10-07T12:28:12.805711694Z”,
“frequency”: 868.5,
“modulation”: “LORA”,
“data_rate”: “SF8BW125”,
“coding_rate”: “4/5”,
“gateways”: [
{
“gtw_id”: “my-gateway”,
“timestamp”: 2701879276,
“time”: “2020-10-07T12:28:12.785062Z”,
“channel”: 2,
“rssi”: -118,
“snr”: -1,
“altitude”: 34
}
]
}

2

It’s possible that the building itself is blocking the direct path. You might try taking a node to some location where you can actually see the gateway antenna. Eg, take a walk down the street and watch the console via your phone.

But also check the antenna connections from the actual antenna all the way back to the concentrator card.

LoRa is far more immune to power supply noise than some other modulation types, but a really noisy power supply conceivably could cause issues, too.

3

Thank you!

I have a spare power supply from a different brand. I will switch and see if there is any difference. I will also check the antenna connections.