TAP6 Microwave Parabolic Gain
Q: How can I compute parabolic gain for a microwave Fixed Facility record?
A: With TAP6.0.2147 or later and a Maintenance Subscription date of January 31, 2007, or later, you can compute parabolic gain in the Antenna section of the Fixed Facility interface.
For example, if you have a record in the Fixed Facility interface in HDPath for a microwave link, click the Transmitter Antenna heading to expand that section.
Click the Edit button near the bottom of the Fixed Facility interface to open the record for editing:
If there is already an antenna loaded into the Fixed Facility record, you must first clear that antenna pattern and gain information by clicking the "X" next to the Major Lobe gain box:
In The Major Lobe data entry box, right-click the mouse to bring up the menu:
(Since parabolic antennas are primarily used for microwave applications, this function only is available when the Fixed Facility transmit or receive frequency is 900MHz or higher.)
Select “Compute Parabolic Gain”
The Compute Parabolic Gain form is displayed, with the Fixed Facility frequency set:
Enter the diameter of the anteana. The gain in dBi is computed. Click the Continue button.
The gain value is inserted into the Fixed Facility antenna gain, and the antenna description shows the size of the specified parabolic dish.
The parabolic gain is based on the diameter, D, and the frequency, F, by the formula:
Gdbi = 20Log10Dmeters + 20Log10FGhz + 17.8
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