Can I Use Two Antennas on One Tv

LOOKING TO HOOK Upwardly?

Join two antennas, that is. (What did y'all think we meant?)

For many viewers of free, over-the-air tv, picking up the broadcasts requires nothing more than than selecting the right antenna and positioning or aiming information technology in the right direction, using compass headings provided by world wide web.antennaweb.org or other Web sites dedicated to terrestrial broadcast Television receiver.

Just what if 1 or more of the TV stations you want to watch transmits from a different direction? What are your options? Do you need an antenna rotator? Tin y'all install a second antenna in combination with the outset antenna?

All good questions. Truth is; there's no one-size-fits-all solution for this problem. Let's explore your options.

For viewers using indoor antennas in an urban or suburban setting, you lot are picking upwardly signals from more one direction already. That's because the electromagnetic waves are traveling from the Idiot box transmitter to your antenna over 2 or more paths – the direct path (if your antenna is "line of sight" to the transmitter), plus secondary reflections of each point that take bounced off nearby structures or terrain. These signals are said to be "multipath" – that is; the waves have taken multiple paths to your antenna, although they don't arrive at the same time.

The ATSC digital Tv set system we use was designed to compensate for signal multipath. In some cases, the straight TV signal can exist canceled out by a multipath betoken that'due south out of phase and arrives at your antenna just a few microseconds later. This problem bedeviled early on implementations of ATSC, and it took several years to build adaptive equalizers that could discriminate between both types of signals and nonetheless provide reliable reception, especially in multipath-rich urban areas. (We'll revisit this multipath echo trouble in a moment.)

For indoor reception, your antenna choices will be express to omnidirectional models, so your TV receiver will do the heavy lifting with multipath. Just for outdoor reception, you may want to use a directional antenna, similar a log-periodic yagi. The reception pattern of this type of antenna maximizes signal forcefulness in the direction it's pointed, while unwanted signals to the sides of the antenna will be much weaker. (Yagi antennas as well take some sensitivity 180 degrees from the front end; i.eastward. off their back.)

If you are using an outdoor antenna and need to pick up TV station(south) from two or more directions, you have a couple of options. One option is to install an antenna rotator and swing your antenna in the management of the desired Television set station. While this will give you the strongest possible signal, it'southward impractical and time-consuming when you lot change TV channels – you accept to wait for the antenna to swing around to become reliable reception.

The other option is to install a second outdoor antenna, aimed in the desired direction, and combine it with the signal from the first outdoor antenna. Sounds like shooting fish in a barrel, right? Mechanically, information technology is: You lot simply need two antennas, two coaxial cablevision pb-ins, and some sort of combiner, which resembles a two-port splitter used in contrary. The betoken attenuation through each combiner port is near ii dB, just that shouldn't be an outcome for urban and suburban Television receiver reception. As a bonus, these combiners also contain an LTE signal filter to reduce interference from mobile phone operations above channel 36.

Is in that location a grab? Perchance. Although the adaptive equalizers in your digital Television receiver are quite powerful, you lot might have a trouble with multipath echoes causing indicate dropout when combining 2 antennas. It depends on (a) the gain of the antennas you use, (b) the compass bending between them, and (c) the signal strength of your desired Television channels. We mentioned earlier that signal strength on log periodic yagi TV antennas is maximized at the front, reduced quite a bit at the rear, and reduced fifty-fifty more on the sides.

Figure i shows this concept in more than detail – it'south a plot of horizontal point strength for a pocket-sized log-periodic Boob tube antenna at different compass headings. The maximum point rejection on the sides isn't at 90 degrees, where y'all might look information technology. Instead, it's closer to 75 degrees. There is actually some signal sensitivity at 90 and 270 degrees, equally well as at 180 degrees. And two additional drops in signal levels occur at 120 and 240 degrees.

Figure i. Horizontal (H) signal pattern of a simple log-periodic yagi Television receiver antenna.

Imagine you are direct above this particular log periodic TV antenna, looking down at it, and you can come across the antenna signal pattern. Television signals will exist strongest at 0 degrees (antenna aimed direct at the transmitter), dropping by half (-3 decibels of dB) at thirty and 330 degrees, and decreasing past an additional 9 dB at 45 degrees and 315 degrees. Maximum horizontal signal rejection with this antenna occurs at about 70 degrees and 290 degrees, with additional notches at 120 and 240 degrees.

If the secondary TV station(southward) you want to watch are located at 70, 120, 240, and 290 degrees from the management yous use for primary reception, then simple coupling of ii or more of these antennas may work but fine – the blaster circuits in your digital TV won't be taxed. (Notation that these compass headings are just "ball park" numbers, and will vary beyond dissimilar log-periodic antenna designs.)

This combining task is made even easier with UHF antennas. It'south possible to become 15 dB or more of signal rejection between two UHF TV panel antennas when mounted at right angles, and even more isolation back-to-back. And if your VHF TV signals arrive from one direction and your UHF signals from another direction, use a UHF-merely antenna for the latter signals. You won't encounter whatever VHF multipath echoes through that 2d antenna.

howardcrichown.blogspot.com

Source: https://www.channelmaster.com/blogs/free-tv/combining-antennas

Share this post