________________________________________________________________________________ 2 AsteRx2eH_PRO
AsteRx2 Product Family Hardware Manual v2.10.1
17
2.1.2
PPS OUT (BNC)
xPPS output (5V, output impedance 50ohms). The characteristics of the xPPS output signal are
specified by the
setPPSParameters
command. The pulse duration is 2ms.
2.1.3
REF IN (BNC)
Use this connector to provide the receiver with an external 10 MHz frequency reference, to be used
instead of the internal oscillator. The reference signal must be sinusoidal with a peak-to-peak
amplitude (unloaded) ranging from 0.5V to 2V (-8dBm to +4dBm in a 50
load).
Connecting or disconnecting the external 10 MHz reference must be done with the receiver switched
off. The receiver checks the presence of the external frequency reference during its start-up phase. If
a valid reference signal is found, the receiver clock is automatically locked to this reference.
Otherwise the internal oscillator is used as frequency reference.
If the 10 MHz reference is removed during operation, the receiver will stop.
2.1.4
REF OUT (BNC)
This connector provides a 10 MHz output signal synchronized with the frequency reference used by
the receiver (be it internal or external). It is a sinusoidal signal with unloaded peak-to-peak amplitude
of 1.1V, and output impedance of 50Ohms.
