Tip 1: How to build a TV antenna

to vacation in the country, we are in no hurry to abandon the comfort of city life.One such element is a television.However, in order that it can receive different channels, it should be equipped with an antenna.It is possible to make it on their own, while respecting the basic principles.
you need
  • copper, brass, steel or aluminum tube, plate or bar, coaxial cable, insulator
Guide
1
Take copper tape, pipe or other metal profiles.It is recognized that high-frequency currents are distributed in a thin layer of the metal surface.In this regard, no matter what is taken to manufacture the antenna - a bar or tube, the outer diameter only is important.When the antenna is used for the metal strip, its width should be about 1.5 times the calculated diameter.TV antenna can be made of any metal: brass, copper, bronze, aluminum, steel, but its surface should be smooth and even.Steel antenna is severe, than that it rusts, thereby impairing its parameters.Most often, the antenna is made of aluminum a
lloy, however, is created on the surface oxide conductive film is bad.High electric characteristics from brass and copper.
2
main loop antenna parameters: copper tape - thickness 1.2 mm, width - 6.5 mm;total length for receiving channels 1-5 - 3500 mm, from 6 to 12 - 1290 mm;the total length of the loop - for 1-5 (49-100 MHz) is 1230 mm, 6-12 (175-227 MHz) - 470 mm;the distance between the ends of the copper strip is 60 mm, to loop it soldered ends;to connect the "screen" is a steel plate 60 mm long, located in the upper part of the loop.Two of the copper plate after the loop distinguish between a dielectric.
3
Seal for protection against moisture place where the coaxial cable is connected to the antenna elements.It is best used for this purpose plasticized epoxy resins.To avoid corrosion after assembly of the antenna and cable to paint it in several layers before this pre-degrease.Use inks that are able to resist external climatic factors and having good dielectric properties, for example, nitroenamels, automotive enamel, in a pinch, you can use oil paints.
4
Identify characteristic impedance of your cable.It is measured by special high-frequency devices.To interact antennas having 292 ohm characteristic impedance, cable 75 Ohm serves as a train.Do not use cable 50 ohms instead of 75 ohms, it leads to repetition and ripples on the screen, thereby significantly degrading the image quality.Orient the antenna at least a reflected interference rather than the maximum signal.

Tip 2: How to build a satellite dish

If you just follow the instructions and perform all the operations in the specified order in it, the problems with the assembly and installation of the antenna does not arise.Even inexperienced users will cope with this task.
How to build a satellite dish
you need
  • details satellite dish, assembly tools, instructions.
Guide
1
Fix the arc konvertoroderzhatelya to support special screws.Set cheek support bracket between the parts are inserted into the gap between the spacers and washers on the outside, fasten all screws.
2
screwed to the support bracket and arch konvertoroderzhatelya to the reflector.Install arc konvertoroderzhatelya holder feed.To do this, insert the projection into the groove and konvertorodezhatelya covers irradiator.Tighten the bolts.
3
To expand antenna on the desired angle, slightly loosen the bolts.Turn antenna so that between the reflector and the vertical plane formed an angle of?- 19.65 ?.Then tighten the screws again.
4
converter Connect a satellite LNB.
Note
When assembling the antenna must be particularly careful when handling the mirror, including aluminum.Even the slightest damage to the surface can deform the geometry of the part, which has a negative impact on the operation of the antenna.
Helpful Hint
When installing the converter rotate it around its axis.This will help to find the best position for the reception quality of the signal.In cases when the antenna covers the converter, follow the pre-polarization configuration.
When attaching the antenna to the bracket using a safety rope.And when you connect the cable to the antenna connector insulate against moisture.
Sources:
  • Installation and assembly of the satellite antenna