XSAT7080 X-Band Transceiver
Revision 0
System Operation
MN/XSAT7080.IOM
3–6
3.3.9 R
EFERENCE
F
REQUENCY
A
DJUST
A manual, fine adjustment of the internal 10MHz reference frequency is provided as a
user controllable parameter. This parameter can be varied within the range 000 to 255,
with the factory default setting at 087. Varying this parameter from 000 to 255 will result
in a change of approximately 6.5 kHz and 4.0 kHz at the RF and IF output ports
respectively.
Associated Remote Command(s):
REF=
3.3.10 E
XTERNAL
R
EFERENCE
F
AULT
L
OGIC
The XSAT allows the user to select whether or not the summary fault relay is activated if
the internal 10MHz reference loses lock with the external reference attached to
‘EXTERNAL REF IN port’ J4.
(The factory default is 0)
Associated Remote Command(s):
LFL=
3.3.11 C
OLD
S
TART
F
UNCTION
The XSAT provides an optional ‘Cold Start’ feature that will ensure that the internal
10MHz reference signal is at a stable temperature prior to allowing the RF and IF outputs
to be turned ON. A fixed cold start interval of 15 minutes is used.
•
If ‘Cold Start’ is ON when the XSAT is powered ON, the IF and RF outputs will
remain muted for 15 minutes even if all the conditions defined in 3.2.5 are
satisfied. At the end of the 15 minute interval, the RF and IF output will
automatically be turned ON if the conditions of 3.2.5 are met.
•
If a XSAT was powered ON with ‘Cold Start ON’, the operator can override this
function by setting ‘Cold Start OFF’.
Associated Remote Command(s):
CLD=
3.3.12 A
UTO
F
AULT
R
ECOVERY
This parameter defines how the XSAT responds to momentary fault conditions.
•
If ‘Auto Fault Recovery ’ is OFF and a fault condition occurs that causes either
the RF or IF output to be muted, then that fault condition clears, the XSAT will
remain muted. In this mode, operator intervention is necessary to return the XSAT
to normal operating mode.
