Transmitters Wireless TV sound|
audio from your source device, broadcast to any FM radio
Low-power FM Radio Transmitters allow you to take an audio signal
from just about any audio source (CD player, tape recorder, iPod,
computer, TV, VCR) and transmit the signal wirelessly to a nearby FM
radio. Portable FM Transmitters offer added versatility by allowing
you to go wireless just about anywhere. Plug in a portable device
like an MP3 Player, iPod, PSP, Laptop, CD player or a tape player
and a FM transmitter instantly makes the audio from your device
available through any nearby FM radio. Plug in a headphone for
silent use so you do not disturb others.
The portable models
are small enough to take along in your backpack or your car, but
powerful enough to cover a radius of up to 250 feet. You can be on
the air almost instantly. All you have to do is insert a AA or 9V
battery, (some come with AC adapters) plug in your audio source and
choose a broadcast frequency. Any FM radio stations in your area
will override your signal if you choose their same frequency, so you
must choose an unused FM frequency in your area. There should be
plenty to choose from so your broadcast will work. The FM radio
spectrum is 88MHz to 108MHz on your FM dial.
FM transmitter specifications:
- Dimensions: from very small hand-held models to table-top
- Freq. Range: 88-108 MHz although some models offer only a
few FM frequencies
- Approx. Broadcast Range: 10-30 ft $$, 50-70 ft $$$,
or 150-250 ft $$$$
- Audio Input: 1/8” Stereo Mini-plug (adapter cables
- Power Supply: AA(2) or 9V Battery (AC adapter
- Stereo/Mono: stereo models are better
- Antenna Type: Built in or external telescoping
- LED Freq. Display: better to have display
- Costs: $12 to over $100. $70 should buy a very good model with
all the features.
soundConnect a small, inexpensive transmitter to your
TV and transmit the sound across the room to a FM receiver with
"earbud" earphones. Hard of hearing people have a problem with
understanding speech, and are aided by use of earphones or
headphones. The goal is to leave the TV speaker on in order to get
the full range of sound and then use the earphones to make the
speech easily understandable.
Most TVs sold today have
an output jack for sound. Sometimes it is marked "AUDIO OUT" and
sometimes it is marked "LINE OUT". These jacks are used to connect
to the FM transmitter in order to get the source sound out to
wirelessly broadcast the sound across the room.
There are several manufacturers that sell
small mobile FM transmitters. These transmitters are designed to
plug into music players and computers so the sound can be received
by FM receivers in your home or car. Some FM transmitters cost very
little but will broadcast only on 4 different frequencies, so you
may have problems with interference from commercial FM broadcasts.
Get one with a full range of selectable FM frequencies so you can
choose one without local interference.
FM transmitter from the CCRANE Company
Crane Company, Inc.
1001 Main Street
The FM Transmitter uses FM radio
waves to send sound from any device you choose (as long as it has a
headphone jack or audio out jacks) to any nearby FM radio or stereo
system. The only wire you have to connect is from the FM Transmitter
to your source device. Since the transmitter works with any device
that has a headphone jack, you can use it with CD players, satellite
radios, and any other audio device with a headphone jack. Most
people use it to send music from their computers or MP3 players to a
nearby radio. Some people use the FM Transmitter as a solution
to the problem of people turning the TV’s volume up too high. You
plug the FM Transmitter into the TV, and send the audio to a small
radio. Those people who are hard of hearing can plug in a headphone
and turn the volume up but not disturb those around them. Use AC
adapter or 2 “AA” batteries. Choose any FM frequency between 88.3
MHz and 107.7 MHz. Portable, fits in the palm of your
Weight: 5.8 oz.
Size: 3" W x 3.5" H x 1"
Cost from CCRANE Co.: $69.95 (Feb. 2007)
BELKIN FM Transmitter
This model of FM
transmitter is less expensive but may not provide the range of
coverage you need. Your radio may need to be within 10 ft or less.
This is fine for some applications but not others.
transmitters have an input cable 3.5mm (1/8 in.) stereo plug (male).
The output of the TV may be a 3.5mm headphone Jack (female) and/or
left and right stereo RCA phono jacks. You connect the
transmitter to the TV. You might need a preamplifier to match the
output signal level from the TV with the input requirements of the
transmitter. Usually the output jack for headphones is a 3.5mm jack
and the transmitter will plug right into
Typically the output level coming from the headphone
jack is enough to drive the transmitter without a preamplifier. A
possible drawback might be that the TVs internal speaker may mute
when you plug in the transmitter's plug. If you choose to use the TV
audio output jacks marked as "line out" (usually two RCA phono
jacks, one red and the other white or black), there may not be
enough level to drive the transmitter and you will need a
preamplifier. It depends on your model of TV. Small preamplifiers
are available online and from Radio Shack and are
receiver that has a headphone/earphone output jack will do. A small
portable AM/FM radio, a boom-box or a stereo receiver. Tune the
radio to the frequency you have selected by connecting everything
up, turning on the TV, and tuning the radio until you can hear the
sound. Adjust the FM radio volume for your desired hearing
- You can adjust the volume level of your earphones with the
- The ability of the transmitter to deliver a clear signal
depends partly on the receiver sensitivity. Very small receivers
will not have very sensitive built-in antennas and will not
pick-up as well as a larger receiver.
This cable connects to the two RCA audio OUT jacks
on TV sets, VCR, DVD, tape decks and other line level audio outputs.
The red and white connectors are called RCA connectors and the other
end has a 1/8 in. stereo female jack. This female jack is where the
FM transmitter would plug in, connecting your source device to the
FM transmitter's audio input.
Audio cable connects to TV output jacks usually in the
back of the TV.
RCA connectors on one end and 1/8 in. stereo mini
jack on the other end.
This connects the TV sound to the input of
the FM transmitter so it can be broadcast out.
Cable used to extend the distance from TV to
FM transmitter. Can also be used as a headphone extension to extend
the distance from the radio to the preferred listening
1/8 in. mini plug at one end and 1/8 in. mini jack at
the other end.
Available at Radio Shack in 16 ft and 20 ft cable
Radio Shack part number is 42-2562.