SX127X RF Module
User Manual of E19 Series Modules
Copyright ©2012–2018，Chengdu Ebyte Electronic Technology Co.,Ltd
5
1.3.2 Receiving sensitivity
Model No.
Min
Typ
Max
Unit
Remark
E19 (433M20SC)
-145
-147
-148
dBm
● The current sensitivity is tested under the Coding rate of
4/5 and spread spectrum factor of 12
● Due to the error of the materials, each LRC component
has ±0.1% error, so error accumulation will occur since
multiple LRC components are used in the whole RF circuit,
and the transmitting currents will be different at different
modules;
● The receiving sensitivity will be reduced and range will be
shortened while increasing the air data rate.
E19 (433M20S2)
-145
-147
-148
dBm
E19 (433M30S)
-146
-148
-150
dBm
E19 (868M20S)
-145
-147
-148
dBm
E19 (868M30S)
-146
-148
-150
dBm
E19 (915M20S)
-145
-147
-148
dBm
E19 (915M30S)
-146
-148
-150
dBm
1.3.3 Recommended Frequency
Model No
Min
Typ
Max
Unit
Remark
E19 (433M20SC)
410.0
433.0
441.0
MHz
● It ensures that the performance of the module can reach
the standard if it works in recommended operating
frequency.
● It is recommended to avoid the crowded frequencies, such
as 433.0MHz, 868.0MHz, 915MHz and other integer
frequencies.
E19 (433M20S2)
410.0
433.0
441.0
MHz
E19 (433M30S)
410.0
433.0
441.0
MHz
E19 (868M20S)
862.0
868.0
893.0
MHz
E19 (868M30S)
862.0
868.0
893.0
MHz
E19 (915M20S)
900.0
915.0
931.0
MHz
E19 (915M30S)
900.0
915.0
931.0
MHz
1.4 Tested parameters
1.4.1 Tested distance
Model No
Min
Typ
Max
Unit
Remark
E19 (433M20SC)
4500
5000
5500
m
● The external antenna used is of 5dBi gain and vertical
polarization;
● The interval between each data packet is 2s, sending 100
packets with 30 bytes in each packet, the range at data lose
rate of lower than 5% is valid range;
● In order to obtain meaningful and reproduceable results,
we conducted the tests under in clear weather with little
electromagnetic interference at suburb areas；
● Distance may be shorter with interference or obstacles.
E19 (433M20S2)
4500
5000
5500
m
E19 (433M30S)
9000
10000
11000
m
E19 (868M20S)
4500
5000
5500
m
E19 (868M30S)
9000
10000
11000
m
E19 (915M20S)
4500
5000
5500
m
E19 (915M30S)
9000
10000
11000
m
