RoyalTek MEB-1000 - Manual (Page 12)

8
MEB-1000 User Manual
capacitor(10uF and 1uF).It can reduce the Noise from power supply and
increase power stability.
(5) Active antenna bias voltage:
The Vcc_RF_OUT pin(pin 20) is provide voltage 2.85V. If you use active
antenna, you can connect this pin to V_ANT_IN pin (pin 19) to provide bias
voltage of active antenna. The bias voltage will be through GPS_RF_IN pin
to provide active antenna bias voltage from Vcc_RF_OUT pin.
If your bias voltage of active antenna isn’t 2.85V, you can input bias voltage
to V_ANT_IN pin (pin 19).And input bias voltage of you need. The input bias
voltage will through GPS_RF_IN pin to provide active antenna bias voltage
from V_ANT_IN pin.
PS:
(1) The maximum power consumption of active antenna is about 100mW.
(2) Suggest input gain > 20dB，and NF < 1.5 dB 。
(6) GPIO:
The GPIO pin is recommended to connect to serial resistance(220Ω),if use
the GPIO function.
If no use GPIO function, it don’t connect anything.