How Do I Compute a Bent-pipe Chain Coverage?

To compute a bent-pipe chain coverage in your STK scenario, follow these steps:

1. Create a Chain object with an analog transponder. This means you must create a Chain object, a source Transmitter object, a Receiver object, a Transmitter object specified as a Retransmitter, and another Receiver object.
2.  Assume that the last link between the Retransmitter and the second Receiver is the link of interest.
3. Right-click the Chain object and select Chain > Compute Access.
4.  Within the Report & Graph Manager, generate the Bent Pipe Comm Link report for this Chain.  
5. Insert an additional Transmitter object using the Define Properties method. On the Basic - Definition properties page, set the Transmitter Model to the Medium Transmitter Model.
6. Alter the values for Frequency, Power, and Gain by using the Bent Pipe Comm Link report to determine the values for the last link in the chain (e.g., Xmtr Power2, Xmtr Gain2, Rcvd. Frequency2).
7. Create a Coverage Definition object and assign the Medium Transmitter as the Coverage Asset. 
8.  Select the second Receiver in the Chain within the Coverage Definition Properties as the Coverage Grid Constraint Object.
9.  Compute Coverage and generate Coverage reports as desired.

For additional insights, refer to the article How do I Use a Transponder in an Interference Analysis?