FMOver

FMOVER Studies

To perform FMOVER studies with INTERDLG, from the "Main screen” click the “FMOVER" radio button. Then set up your station parameters as defined under Interference Mode. Then click the "Make” command button. The FMOVER screen will then pop up asking you to confirm the signal contour values of the protected station (Ref #1) and the interfering station. Generally, all you have to do is accept these values. You may change the computer selected values by using the provided sliders.

Once you have established the signal levels to be used in the study you can also select the arc along the Ref #1 station's protected contour which will be analyzed. The computer will select an arc of 60 degrees. The center of this arc will be on the azimuth toward the Ref #1 station. You may use the sliders to change arc length to suit your specific needs. The "Interval” slider adjusts the azimuth interval to be sampled along the arc. Click "Continue" when you are ready for your print-out.

FMOVER produces a print-out only, not a map. Set your printer up using the Windows Desktop Printer Setup Procedure. (Refer to your Windows manual.)

How FMOVER Works

The FMOVER printout checks the incoming signal of a potentially interfering station at user specified azimuth increments along a station's protected contour. If the program finds a signal which exceeds the allowable U/D for the given channel relationship it will place an asterisk next to the troubled signal in the far right hand column. Having no asterisk is a sign no overlap has been detected.

Remember the results of FMOVER may vary slightly from the FCC’s program due to the fact you are using a different terrain database(NGDC as converted to metric and updated).Also, at last check, the FM branch was still averaging 2 to 10 miles along the radial instead of the required 3 to 16 kilometers. However, there is virtually no better method to determine if contour overlap exists than the FMOVER and plotted contour techniques employed by this program.