Hi!
This is an information for all of you, doing experiments with real hardware!
I wanted to explain, what this lna_gain stuff is used for:
If you are receiving messages from different sender (let's say several
thermometers), it may happen (e. g. due to different distance and
different battery level) that the automatic gain control of the receiver
amp isn't able to work correctly. E.g. if it gets a very strong singal
first and a very weak afterwards, it is possible, that the agc isn't
capable to recognize the second telegram predictable.
The procedure, need to be done in such a case is:
Switch on agc. Wait for a correct telegram to be received. Read the
lna_gain_current value and store it. This is the gain setting for
optimal reception for one of your sender. You now can set gain_select to
this value, in order to receive stuff from this sender (instead of using
agc).
If you want to receive stuff from an other sender, you may want to try
with different other settings. As soon, as you have success, you can
store this value and use it for receiving stuff from that sender.
Since I have just a 35m² flat, it is quite hard to have a setup, to test
such stuff. In summer I did some experiments on the pavement, but the
experimental code never was integrated in the productional source repo,
because I focused on tx first. Deeper use of rx is planned for late
spring next year.
If you want to do experiments with rx of signals with different
strength, maybe you want to save a copy of the abstracions
(rf69_set_lna_gain and rf69_get_lna_gain) befor they get deleted in
staging-next.
Regards,
Marcus
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