UT986eb User Manual
UC-08-M37 EN R1.0
Antenna Circuit
11
4
Antenna Circuit
4.1
Antenna Short Protection Circuit
The antenna short protection circuit consists of a load management chip and peripheral
circuits. 5 V DC/DC circuit output feeds the antenna via the chip. When the antenna
current is larger than 100 mA, the circuit triggers a short protection and FLAGB gives a
low level indication.
After removing R44 and R45, the antenna short protection circuit is bypassed. You can
use the 5 V DC/DC circuit output to feed the antenna by soldering R46.
Ant Bias
U4
FPF2004
Figure 4-1 Antenna Short Protection Circuit
Figure 4-2 Antenna Short Protection Circuit on the Bottom of EB
