Alpermann+Velte GPS D25 G 6, Operating Manual, Page: 7 / 14

Operating Manual GPS D25 R/G/Y 6
Page 5
such switch-over is not required, the receiver may be switched via internal dip-switch to
UTC.
Three LED’s indicate the operational status of the receiver:
LED Color Function
MOD green Flashing with every internal transmission of a data telegram.
FREE red Lights up if the receiver is operating in the free-running mode. Will
go out if a sufficient number of satellites has been detected to
ensure synchronisation.
In addition the FREE-LED indicates with a blinking in five-second intervals the exact status of
synchronization.
LED FREE Reception status Satellites in reception
Blinks continuously no synchronization since switch-on none
Blinks with brief
Interruptions in five-
second intervals
no synchronization since switch-on number of interruptions
corresponds to number of
satellites in reception
Switched-off, but
blinks briefly in five-
second intervals
real-time information was received but
reception is not possible at the
moment
four times blinking means:
no satellites in reception.
Every less blink means: one
more satellite in reception
Switched-off synchronous at least four
Specifications of the GPS receiver
Antenna input 1575,42 MHz (L1 band), -130 dbW
to -163 dbW
Antenna connector
SMA female, 50 Ω
Antenna type active
Power supply pre-amplifier 5 V DC, 100 mA max., short circuit proof
Time from power-on to first synchronous
reception
10 minutes approx.
Battery 3 V lithium, working life: 10 years
Date validity until 31.12.2017
Accuracy (of P_SEC leading edge):
in free-running mode at delivery adjusted to <2ppm/25°C
at 15-35°C: <4ppm
at 10-40°: <8ppm
at 5-45°: <20ppm
aging (first year): < 3ppm
jitter at synchronous reception ± 2µs (2ppm)
in free-running mode after first synchronous
reception
± 1µs (1ppm)