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NebraLtd / hm-pktfwd

Helium Miner Packet Forwarder
https://nebra.io/hnt
MIT License
12 stars 25 forks source link

Rssi too strong compared to other hotspots #16

Closed disk91 closed 1 year ago

disk91 commented 3 years ago

At least for Europe, RSSI reported by some Nebra hotspot is really high compared to other nearest hotspot. As a consequence, the Nebra hotspot get Join Accept, ack and donwlink messages to process. This is applicable to hotspot used with outdoor antennas. As an example, I've seen -80dBm > -90dBm over 13.8km. Free space path loss for 13.8km is 100dBm confirming the Nebra Rssi to be valid for 14dBm, but the problem it is really higher than the others.

Other hotspots are reporting for the same mesage:

As a consequence, since this Nebra is up, there is a real difficulty for devices in the city to join the network and receiving Ack.

shawaj commented 3 years ago

Do you have further details of the hotspots in question so we can take a further look at them on the network?

disk91 commented 3 years ago

Take a look at Spare Lemon Urchin

shawaj commented 2 years ago

Take a look at Spare Lemon Urchin

For reference https://explorer.helium.com/hotspots/11RRgLVeh7eigMp8wurCn4pCjfxhfk5iFz4CioP3MuYfmCapbv8/activity

@disk91 I don't see however that this is an issue with our concentrators, more what helium considers to be a valid witness in their acceptance curves

shawaj commented 2 years ago

Interesting reading here also - people with other hardware with similar issues https://github.com/helium/miner/issues/618

n5qm commented 2 years ago

This may be impacted by the use, or lack of, a saw filter on the concentrator as the generally introduce quite a bit of loss.

Another potential source of the issue is that some devices report rssi vs other that report rssis, which can be vastly different figures.