A -9999.99 value can appear in communications reports when any of the following happens:
- The transmitter and receiver do not have access (RF intervisibility) to each other.
When a communications link does not exist between transmitters and receivers, STK returns a null in the communications link quality reports. Ensure that the objects (transmitters and receivers) have access.
- The transmitter and receiver antennas may not be appropriately pointing at each other. Gain represents how much the antenna amplifies a signal.
A null occurs when waves radiating from an antenna destructively interfere with each other. In STK, we represent this null with -9999.99 dB in the link budget report. To avoid this, you need to adjust the pointing of the antenna to obtain a valid gain in the direction of the link. You can do this by changing the pointing on a complex model antenna or using a sensor to point. You need to do this on both sides of the link.
- The transmitter and receiver do not share the same bandwidth. If there is no overlap between the transmitter bandwidth and receiver bandwidth, the Rcvd Iso Power parameter will display a value of -9999.99.
To learn more about modeling communications links in STK, please see the
Introduction to STK Communications tutorial.
For more details about available link reports, please see the
Evaluating Communications Links help page.
