There is a shortening factor v that depends on the dielectric and the thickness of the elements of the antenna. The above calculation is not really exact. The result shows that the r/c antennas fit our needs. The same calculation for 778Mhz leads to a 1/4 wavelength of 0,096m. The wave length of a frequency can be calculated using the formula L=c/F. So we will build a uhf only antenna here. The r/c antennas used here are to short for vhf but they work well with uhf. The frequencies used for DVB-T in Germany contain 177,5Mhz to 226,5Mhz (band III, vhf) and 474Mhz to 778Mhz (band IV and V, uhf). The antenna is basically a vertical polarized dipole antenna using 1/4 wave length elements.
Tv tuner for pc with antenna driver#
I am German -) Material: - two r/c remote control antennas - about 40cm RG-174 coax cable (don't use to much because the damping of this cable is high) - coax connector that can be plugged into your receiver, i used a bnc blug - vacuum cup, for easy mounting - hexagonal brass nut, size M3 (in my case, could be other size for you) Tools: - pliers - soldering iron - solder - sharp knife - hacksaw - small screw driver - fine sanding paper - maybe some silicone spray or oil All measurement is done in the metric system using meters not inches. The antenna can be mounted using a vacuum cup because it doesn't wight much. The antenna can be tuned by changing the length of the dipole elements.
Just use some heat shrinkable tubing to fix them. This makes the mechanical construction easy.
The antenna will be small because it is build for a frequency range 470Mhz to 740Mhz. Two antennas will be used for the sleeve antenna, being a vertical polarized dipole. Using a thin coax cable (RG-174), the cable could be feed through the small pipes of the antenna. I had some lying around from small r/c cars I bought on eBay ( ). Get some extendable antennas from r/c remote controls.
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