How to determine the exact length of the waveguide ?? The length should always give a multiple of the wavelength (26mm).
I would measure from the waveguide at the feed horn beginning to behind the taps H and V. I flan all LNBs myself and the screwed waveguide with feedhorn always have different lengths. I wanted to optimize this.
Best regargds dreamsat[/quote]
Hi dreamsat

The ideal waveguide would be a variable length waveguide. But that is the problem to realize. The differences between the ideal and the average length is minimal. Therefore, it is best to use the length calculated for the center of the received frequency band.

Peon