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Restioson
Restioson
06:24
Hey. I am looking to buy a LoRa module (RFM98W, 433mhz), and am trying to figure out whether this exceeds my country's regulations of 100mw ERP on 433mhz or not - it says that it has a 20dbm transmitter, and then a 14dbm amplifier, which (I think) would exceed the power limit.
I then looked to see if you could disable/limit the power output, and I found a setTxPower() here airspayce.com/mikem/arduino/RadioHead/classRH__RF95.html - However, they also added a table of set power/observed power (this is where I'm puzzled): i.imgur.com/SJKtEN5.png
For some reason, they seem to have added an attenuator? I'm not sure why they did this. Could anyone perhaps help to explain??
PlasmaHH
PlasmaHH
06:43
@Restioson you know that power meters have a certain input power range?
Restioson
Restioson
tbh i'm pretty noob
I just don't know why they needed an attenuator if they were setting the output anyway
 
1 hour later…
PlasmaHH
PlasmaHH
07:46
@Restioson check the specs of that power head, if it measures up to 12dBm and you output 24dBm into it, someone will not quite like it.
Restioson
Restioson
oh
oh that makes a lot more senss
sorry I'm really newb with the actual hardware RF side of it :) Thanks for the help. SO basically, they put an attenuator on which -12db from the output, then they measured it, and added 12 back
I was thinking that the stuff in the table was the bare reading from the power head
 
2 hours later…
PlasmaHH
PlasmaHH
10:06
hm, one would think that selling youtube views on ebay was against some of their tos ...

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