Hello guys again!

I do understand how meshtastic works, that buildings, trees may cut the signals and the higher the better etc.
Yet, in my home, leaving my device l1 tracker pro at a specific place, gets lots of traffic, and I receive more messages than before. Since then I always leave it there.
Now my question is, how come I can receive messages but not sent, especially when channel utility is 7 or even 10 percent? Do I miss something?

This is typical. You need better line of sight.

Typical? Interesting, yet weird on how specifically goes it.

The frequency and power these things transmit at is VERY low. Think trees and leaves can get in the way of signals getting from device to device.

I agree with @roofuskit@lemmy.world its probably lone of sight. There are two ways i have tested in the past:

1. Get another meshtastic device and walk around the neighborhood.
2. Test with an rtlsdr (usb dongle) that can pick up radio and "see" the signal strength. This one may be overkill for most.

GL!

Great thanks!

There is likely someone with a higher power repeater (think RAK 1-watt kit) or much higher gain antenna running a node somewhere nearby. With a better transmitter, there is enough wireless link budget to receive such a strong signal at your location, but the puny 25mW@2dBi from your handheld cannot be heard out through the trees and walls.

Look into getting a roof top node set to CLIENT_BASE.

Thanks for your answer! Yea they told me about the client_base, planing to do it in couple months.

Here's a graph that help explains how LoRa Link Budget works with antennas and transmitters. You can see how a weaker radio might be able to hear a stronger radio in one direction, but the strong can't hear the weak in the other based off their EIRP.