Advantech INTRAC-305 user manual High accuracy of the model the tracking is within 0.05dB

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INTRAC-305	TECHNICAL DESCRIPTION
	the high accuracy of the model the tracking is within 0.05dB of
	peak signal tracking.
	In Tracking Mode the INTRAC continuously updates the model
	by making small perturbations of the antenna and incorporating
	the resultant data into the model. During periods when the
	satellite’s orbit is changing because of station keeping
	manoeuvres the INTRAC may increase the frequency of the
	perturbations.
	If the beacon receiver stops providing a useful signal* the
	INTRAC will enter “Predicting” sub mode. In this mode the
	INTRAC will continue to point the antenna according to the
	model but will not update the model. Once “Tracking Mode”
	has been achieved “predicting” can continue for 72hrs. If the
	beacon receiver returns to providing a useful signal* within this
	period the INTRAC returns to updating the model. If, after
	72hrs, the beacon is still not producing a useful signal* the
	model is deemed to have expired. If this occurs the INTRAC
	can fall back on the “Reserve Model” which is a Program Track
	using either IESS-412 or NORAD data. (see Reserve Model -
	page 48)
* useful signal	A useful signal is defined as one that varies sensibly during
	antenna movements, is neither over or under range and the
	beacon receiver is in lock.
Manual	Manual Mode allows the operator to drive the antenna using
	the Manual Control keys on the INTRAC front panel. It is
	normally only used for small movements of the antenna such
	as peaking when the position of the satellite is known with
	close accuracy.
	For larger antenna movements one of the Goto modes is faster
	and where the satellite’s position is only roughly known search
	is employed to peak the antenna.
	There are two Manual Modes. Manual (P) Mode is manual
	control from the front panel. Manual (A) Mode is manual
	control from the Remote Terminal. (see section 9). The
	antenna can be driven through North (Azimuth 0°), in the
	Northern Hemisphere, or South (Az 180°), in the Southern
	Hemisphere, only in Manual (P) Mode.
Goto	There are three Goto sub modes. Goto Position and Goto
	Satellite provide a convenient method of driving the antenna to
	a specific position. Search mode is the automatic scanning of
	an area of sky for a satellite.
Goto Position	In this mode the operator enters the co-ordinates and beacon
	frequency of the required satellite and presses the enter key.
	The entered co-ordinates are checked for validity (i.e. are they
© 2011 Advantech Wireless	INTRAC-305 MANUAL - Issue 3.2	Page 57