Introduction

A good antenna holder system is a must for the experiments. This is the first prototype of a very basic rotator, made out of wood plate and simple components all avaiable at Ebay or in the internet. The design files are listed below also.

 

The final rotator.

The Rotator Mechanics

 The antenna rotator device is called Azimuth Positioner in the literature, since it will move the antenna only in azimuth direction. The rotator is built with stepper motor and an "XMC1300 Stepper Shield", which is capable to drive motors in full/half/microstep mode. The kit with an arduino Uno board is a good combination if you need a simple but reliable stepper driver. The motor commands are sent via the virtual serial port of the arduino board.

Power Supply is capable to deliver 3.2A at 24V. I recoomed to use similar power supplies, since you can change your motor later to a stronger one if necesarry. The 5V for the arduino board and future peripheries is delivered by an adjustable DC-DC converter from ebay. Set the converter to 6.5-7 V since the arduino board has a5V LDO integrated.

 

The diffirent circuits of the rotor.

 

Hall sensor board with 3 x 3 x 3mm magnet mounted on the rotating plate.

 

 

 Position

MPN

Manufacturer

Distributor

Order No.

Note

M1

KITXMC1300IFX

9201TOBO1

Infineon

Mouser

726-KITXMC1300

IFX920

Stepper Motor Control Shield with IFX9201 & XMC1300

M2

A000066

 

Arduino

Mouser

782-A000066

Development Boards & Kits - AVR Arduino Uno Rev 3

M3

LRS-75-24

Mean Well

Mouser

709-LRS75-24

Switching Power Supplies Switching Power Supplies 76.8W 24V 3.2A

M4

-

-

Guangzhou Manyi

Trading Co.Ltd.

ebay link

5A 5V 12V/24V DC-DC Step down Spannungsregler Abwärtswandler Buck Modul

 

M5

-

-

MissBirdler

amazon link

MissBirdler Hall Effekt Transistor Sensor LM393 für Arduino Raspberry Pi

Z1

-

-

Polulu

ebay link

Pololu Universal Aluminum Mounting Hub for 6mm Shaft, M3 Holes (2-Pack) 1999

Z2

-

-

Onpira

amazon link

Aluminum rotating plate, 120mm.
ALU Drehteller 13 Größen von 120 bis 1000mm (Aussendurchmesser: 120mm;)

Z3

 -  -  Smagnon amazon link

Magnets 3x3x3mm, N45.

5 xWürfelmagnete 3,0 x 3,0 x 3,0 mm N45 Nickel.

The Antenna Holder

The antenna holder is made of a camera stand. On the bottom side it has thread which makes it comfortable to mount. I found it since a long time on Ebay but similar can be ordered anytime. It also allows to set the elevation of the antenna. In order to connect the thread to the a small 3D part has to be printed. Download the STL, and IPT (Inventor) files here.

The 3D printed holder mounted with screws.

Downloads

rotartor mechanical design: rotator-baseplate-drawing.dwg

Transportation is important!

I found it useful to size the main units to fit in to a transport box. In Germany the hardware stores are selling such wood boxes (e.g. W:40 x L:30 x H:23 cm) with covers. The laser cut plate has W:36 x L:26.5 cm, so there is space for a cable and easy removing. It also fits to "euro-boxes".

 

 

 

 

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