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Ligne 100 :
Ligne 100 : − + − + − <syntaxhighlight lang="c">rf69.setTxPower(20, true);</syntaxhighlight>+ − Notice: the second parameter concerns the HCW radio modules and indicates that extra amplifier is present.+ + + + + + + +
ENG-CANSAT-PICO-RFM69HCW-TEST (voir la source)
Version du 27 février 2022 à 23:09
, 27 février 2022 à 23:09→Transmission Power
=== Transmission Power ===
=== Transmission Power ===
The transmission power is set with the function call.
The transmission power is set to 13 dBm by default (it is safer across all RFM modules, the library also work for RFM95).
The range of power is 14 to 20 (in dBi). Lowest values requires less power. Means higher battery life but also smaller transmission distance.
The transmission power can be set from 14 to 20 dBm by assigning the {{fname|tx_power}} property.
Lowest values requires less power. Less power means higher battery life but also smaller transmission distance.
<syntaxhighlight lang="python">rfm = RFM69( spi=spi, nss=nss, reset=rst )
# rfm.tx_power = 13 # 13 dBm = 20mW (default value, safer for all modules)
rfm.tx_power = 20 # 20 dBm = 100mW, 20 dBm for FRM69HW only</syntaxhighlight>
{{underline|Tips & Tricks:}}<br />It is possible to estimate the transmission power (in milliWatts) by using the following function.
<syntaxhighlight lang="python">def dbm_to_mw(dBm):
""" Transform the power in dBm to its equivalent in milliWatt """
return 10**((dBm)/10.)</syntaxhighlight>
{{ENG-CANSAT-PICO-TRAILER}}
{{ENG-CANSAT-PICO-TRAILER}}