FLEX-6000 Signature Series – FLEX-6000 Hardware Reference Manual
Page 43 of 48
Copyright 2016 FlexRadio Systems. All Rights Reserved.
14 OPTIONAL GPS DISCIPLINED OSCILLATOR (GPSDO) SETUP
14.1 GPSDO INTRODUCTION
The FLEX-6700 and FLEX-6500 Signature Series radios have the ability to attain extremely
precise frequency control through the use of an optional Global Positioning System
Disciplined Oscillator (GPSDO) module. After satellite acquisition and synchronization, the
GPSDO is capable of maintaining frequency accuracy to <5.0 x 10
-12
in a stable temperature
environment.
14.2 GPS ANTENNA PLACEMENT
In order for the GPSDO to function properly, the indoor GPS receiver antenna must be
positioned so it has an un-obstructed view of the sky in order to receive timing information
from the GPS satellite constellation. While the best location for a GSP antenna is outside
in the clear, most of the time simply placing the indoor antenna in a window will suffice.
In general, the better the view of the sky (south in the northern hemisphere and north in
the southern hemisphere), the quicker the GPS will lock to a high accuracy level. Some
experimenting may be required to find the optimal location.
I - The included low profile GPS antenna is not waterproof, therefore it is not suitable for
outdoor use.
I - The included low profile GPS antenna may be
marked with the word “PULSE”. This is actually the
BOTTOM of the antenna and should be placed down
and away from the sky. An included adhesive tape
strip is available for permanently affixing the GPS
antenna to a window sill or outside location.
Δ – CAUTION: USE CARE IN ATTACHING OR
REMOVING SMA CONNECTORS. BEST PRACTICE IS TO
HOLD THE COAX WITH ONE HAND WHILE TWISTING
THE SMA CONNECTOR SHELL WITH THE OTHER. ONCE THE MALE AND FEMALE
CONNECTORS MATE, TURN UNTIL SNUG BUT DO NOT OVER TIGHTEN!
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