Cable Receiver Model
This model represents a receiver that is physically connected to the transmitter by some type of "fixed line medium," such as wire, coaxial cable, twisted-pair cable, CAT-5, and fiber optic silica. It is available only for a receiver attached to a facility, place, or target.
You can set the following parameters for this model:
| Parameter | Description |
|---|---|
| BER | BER (Bit Error Rate) is the probability that a bit is in error (for example, a zero is transmitted but a one is received). The BER is the number of bits in error divided by the total number of bits sent. |
| Extra Cable Factor | This is a multiplier value to the great arc distance, the product of which will be added to the great arc distance. For example, if the great arc distance between a transmitter and receiver is 1000 km and the cable between the transmitter and receiver is intended to be four times the great-arc distance, then the Extra Cable Factor would be 3.0, resulting in an entire cable length of 4000 km. |
| Propagation Speed Factor | STK uses this scale factor when calculating the delay through the transmission medium. Its value range is 0.0 to 1.0, and STK applies it to the speed of light to adjust the speed at which EM propagates through the desired medium. A value of 1.0 (default) indicates that propagation through the medium is at the speed of light. |
STK uses Extra Cable Factor and Propagation Speed Factor as follows in calculating Propagation Distance and Propagation Delay:
Propagation Distance = great arc distance + (great arc distance * Extra Cable Factor)
Propagation Delay = Propagation Distance / (speed of light * Propagation Speed Factor)
You must enable the Access Advanced Option Use Light Time Delay if you want STK to compute the Cable propagation delay.
For report styles that need two or more objects, a receiver that uses the Cable model will produce data in the reports only if the other objects also use the Cable model. If a multinode chain is misconfigured with a transmitter that uses the Cable model and is followed by a receiver that uses a non-Cable model (or vice versa), the report will not issue any data results and will display an error message in the Message Viewer indicating the node that may be in error. You should also check the prior node.
Computing access between a Cable Transmitter and Cable Receiver
You must disable the Line of Sight constraint on both sides of a cable link to compute access between a Cable Transmitter and Cable Receiver.