Wireless audio/video transmission systems consist of two main parts: a Transmitter
and a Receiver. The Transmitter uses a wired connection
(most commonly via Composite RCA cables or HDMI cables)
with the AV output from a source component such as a cable box, satellite receiver, DVD player, Blu-ray Player, Roku, DVR,
or Apple TV. The Receiver uses a wired connection with the AV input(s) on a TV.
Once the Transmitter and Receiver are
installed the AV signals are sent from a source component out to the
Transmitter, wirelessly on to the Receiver and out to the TV. Typical applications for this setup are when
the Receiver may be located inside a cabinet, in an
entertainment rack, behind closed doors or in another room; and/or the TV is
located where a wired connection is not possible or may just simply be an
eyesore, like a flat panel wall mount application. Without the need to make long AV wire connections you can
place your devices almost anywhere.
CHANGING CHANNELS REMOTELY
A common question with a wireless setup like this is how to
change channels if the source component is in another room or in a location
without a line of sight to the IR remote. Fortunately most systems include a
built-in IR pass-through system. The Receiver features an infrared (IR)
receiver, that takes in a signal from your IR remote and passes it wirelessly to the Transmitter and out to an emitter
that repeats the IR signal to the source component. If the wireless solution
doesn't include an IR pass-through, or if a little more discrete installation is needed.
WIRELESS FREQUENCY
It is also important to
understand the frequency that the wireless system uses. Almost every home today
is operating on at least one, if not multiple, wireless systems - wireless home
automation, phones, doorbells, intercoms, security systems, sensors, speakers
and more. Many of these use lower end frequencies, which you will commonly see
as a specification of 314 MHz, 433 MHz or 900 MHz. More recently higher end
bandwidths have been used, which you will see as a specification of 2.4 GHz or 5.8 GHz. The frequency of the device doesn't
necessarily correlate to the quality of the product. The important thing to
understand is that you want to try and make sure there aren't multiple products
using the same frequency, as this can cause interference and decrease the
reliability of the products. Ideally, you will want to be using different
frequencies for each set of products to ensure the optimal results of your
installation.
EXPANDABILITY
The final consideration on picking the right wireless video transmitter is it's expandability, or the ability to send a wireless signal to more than one receiver.
Not all system allow for this, So if you have more than one remote TV that
wants to tap into the wireless video signal,
just purchase an additional receiver for a system that supports it.
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Right now, HDMI Connection become the
mainstream interface, so Wireless HDMI Transmitter and Receiver comes with HDMI interface. So,
What is HDMI wireless av transmitter? 
