User's Manual

window boundaries tightly around the expected pulse interval of the transmitter will help

prevent bursts of noise from being reported as signals. It will also help relieve congestion in the

processor, since invalid events take less time to process than legitimate ones.

Both gain reduction and time interval filtering have limited usefulness if the dominant noise

source is "impulsive". Engine noise of all kinds falls into this category. Impulsive noise is

characterized by repetitive, but typically very narrow pulses, each with sufficient peak power to

be recognized by the receiver even though the average noise power may be well below the level

of the desired signal. In such cases the time interval window must be opened (to include

intervals on the order of the noise period) and signals and noise distinguished on the basis of

pulse duration. In the Suretrack receiver this is accomplished by delaying the measurement of

signal strength long enough for a typical impulse to have decayed completely before the

measurement occurs.

ADDITIONAL INFORMATION

This equipment has been tested and found to comply with the limits for a Class B digital device,

pursuant to Part 15 of the FCC Rules. These limits are designed to provide reasonable protection

against harmful interference in a residential installation. This equipment generates, uses and can

radiate radio frequency energy and, if not installed and used in accordance with the instructions,

may cause harmful interference to radio communications. However, there is no guarantee that

interference will not occur in a particular installation. If this equipment does cause harmful

interference to radio or television reception, which can be determined by turning the equipment

off and on, the user is encouraged to try to correct the interference by one or more of the

following measures:

• Reorient or relocate the receiving antenna.

• Increase the separation between the equipment and receiver.

• Connect the equipment into an outlet on a circuit different from that to which the receiver is

connected.

• Consult the dealer or an experienced radio/TV technician for help.