In my post A challenge for ingenuity I wrote:
If you are interested in how I built the "green" dots, please "like" this post. If you are not interested in this question - put any other rating, for example, "dislike".
If there are more likes, I'll create a thread about fine-tuning offset antennas with simple antenna measurements
Seven people voted "FOR". In addition, the following requests come to the PM:
I have a problem with my laminas antenna.
How can I measure the geometry of laminas and set it optimally?
Can you please explain to me step by step what I have to do and what I have to pay attention to...
Therefore, today I will begin a publication in which I will tell you about the Parabola 6.2 program - how to use it to determine the main parameters of a parabolic mirror and adjust the receiving unit to the maximum gain.
At the same time, I will help you optimally configure the Laminas 2700 antenna
But we will start with the Parabola 6.2 program for measuring parameters of parabolic antennas.
In this program, I implemented an exclusive algorithm for determining all geometric (and not only) parameters of an offset cut from a paraboloid of revolution in just three dimensions of the antenna mirror:
- height AB (major axis of the elliptical notch);
- width CD (minor axis of the elliptical notch);
- depth EH (perpendicular from the intersection of lines AB and CD).
Consider this using the CA - 1200 antenna as an example:
First of all, note that the vertices of the ACBD rhombus lie on the elliptical line that separates the parabolic part of the antenna from the bead. It can be flat or convex, but the points always lie on the points of change in curvature on the cross section of the antenna mirror.
You need to start marking the ACBD rhombus from the bottom point B, which is most easily determined visually.
When the rhombus is marked, pull thin threads between points AB and CD, which should barely touch each other at point E.
Take photographs of the antenna with the filaments stretched in front (the camera is on the continuation of the EH line) in profile (in the plane of the mirror cut on the continuation of the lines AB and CD).
Take a close-up photograph of points A, B, C, D and E so that the contact of the threads with the antenna and with each other is visible.
Post photos in this thread, and we will evaluate the accuracy of your constructions and the quality of the antenna surface.
See sample photos below: