Log Periodic Tv Aerial

Using a Log Periodic TV Aerial Delivers Efficient Reception

If you are in an area where wide bandwidth is needed, you'll be best served by using a log-periodic TV aerial that receives signals reliably. A log-periodic aerial is especially useful for TV reception, even though there are many other uses. No matter the purpose, these aerials are efficient and consistent enough to provide all the signal strength you require.

While a dipole LP array (LPDA) is the most typical type of a log-periodic aerial, there are many other types available. Some of the most common log-periodic aerials are:

• Planar
• Zig-zag
• Slot
• Trapezoidal
• V LP
• Dipole LP (LPDA)

The biggest advantage that a log-periodic table possesses is the consistency of its characteristics over any set frequency range of operations. Each set range will have the same radiation resistance, the same SWR, the same gain, and the same front-to-back ratio. Another advantage is that the aerial design is compact.

A Yagi aerial is mostly used for domestic purposes. The power in a Yagi aerial is focused either on a single element or a group of small elements. The smaller pieces in the front direct the signals while the pieces in the middle and back serve to reflect. This narrows the channel of the signal to the receiving element, which can be as small as 1 or 2 feet wide.

A log-periodic aerial is primarily used for commercial purposes and when a wide range of frequencies is needed. A log-periodic aerial has a similar appearance to a Yagi aerial but is actually quite different. A log-periodic aerial's horizontal elements all receive elements whereas only a small number of elements in a Yagi aerial are receiving. A log-periodic aerial will therefore have a large array with no gaps.

A log-periodic TV aerial is a directional aerial with multiple elements that operate over a wide frequency band that was invented in 1958 at the University of Illinois. The most common type of log-periodic aerial is a dipole array, or LPDA, which has half-wave dipole elements of incrementally increasing lengths. Each one of these dipoles is a pair of metal rods. The dipoles are spaced together in a line and are parallel to the feedline (transmission line that receives and transmits). The electronic process functions in a similar manner to Yagi antennas that are connected together, with each set directed toward a different frequency. Common uses for a log-periodic aerial are for HF communications, year-round monitoring in higher frequency bands, and certain types of TV receptions.