The transmission line lookup table, was compiled from the Andrew 37 catalogue and includes the following data:
- Manufacturer - model - technology (elliptical waveguide, foam and air dielectric heliax), rigid wave guide and generic coaxial cable).
- Frequency range.
- Table of frequency versus loss in dB /100m.
The values in the loss column on calculated on entry using the design frequency. A blank loss means that the frequency is outside the frequency range. If the frequency in the "Loss shown for frequency" edit control is changed, the loss values will be recalculated; however the design frequency is not changed.
The table can be filtered by frequency or technology. For frequency, check the "Frequency in range" box and click the Apply button. For technology, select the technology from the drop down list and click the Apply button. If the model number is known, enter this in the "Find" edit control and the display will scroll to the model.
The buttons with a +, are used to transfer the transmission line data into the data entry form.
Adding a new transmission line
Enter the manufacturer model and technology in the upper section and at least two values of frequency and loss.
The maximum and minimum are taken as the first and last entries in the list. The loss is determined by the linear interpolation of this table.
Editing an existing transmission line
Place the cursor on the required entry and click the Edit button. The procedure is exactly the same as for the Add button described above.
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