User's Manual

Radio Activity S.r.l. 19 / 44
The PPS acquire time is around 1 minute with good GPS signals (the frontal led “RX1” flashes red until the
PPS is ready). Once the PPS is acquired (the frontal led “RX1” flashes orange), another minute is request to
synchronize in time and frequency the equipment (than the frontal led “RX1” flashes green synchronously
with the arriving PPS).
KAIROS has the ability to automatic switch the synch source selecting the best available. The synch priority
is settable using the synch mask of the setup tool:
In multi equipment assembly like a multicarrier trunking application, it is possible to use only 1 GPS receiver
shearing the PPS signals to the other equipments via the 6pin connector placed in the back of the equipment
as shown in the following paragraphs.
3.3.3.1 In site GPS sharing
A special technique is implemented to allow also the use contemporary 2 or more GPS receivers for
redundancy. The follow figure explain how to share the PPS: