Noisy Signal

• An unstable input signal can cause the HP 8902 receiver to encounter noise or static on the set frequency. There are a number of ways to troubleshoot a noisy signal. One method involves calibrating the "IF Synchronous detector" on the device. Another method is to select a wider-band frequency by keying in the "4.4 SPCL" command button on the receiver.
  
  

Drifty Signal

• A drifty signal occurs when the HP 8902 receiver cannot lock on to a signal and displays an error on its display. Troubleshooting a drifty signal involves using the "IF Average detector" to obtain a wider measurement bandwidth. Engage the "IF Average detector" by pressing the "AUTOMATIC OPERATION" key followed by the "4.4 SPCL" key on the receiver.
  
  

Measurement Problems

• Problems with measuring the feedback information of a signal or frequency can cause the HP 8902 to display an alert or error message on the display. This problem occurs when the device is encountering poor input signal conditions or an incompatible operating function. Troubleshooting a measurement problem can be done by canceling out function requests by pressing the "AUTOMATIC OPERATION" key on the receiver.