Listen LT-803-072-01 handleiding
Handleiding
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12
The antenna for the LT-800/LT-803 can be mounted directly on the unit if desired. However, you may find
that the unit will provide better performance when the antenna is located elsewhere. If you plan to mount the
antenna in a different location other than the top of the unit, you must use cable and connectors rated at 50
ohms. Although cable used for cable TV installations looks similar to this cable, it will not work with your Listen
system.
If you need to run cable over a length greater than 50 feet for 216 MHz applications or greater than 100 feet
for 72 MHz applications or to maximize broadcast range, Listen recommends that you use RG-8 cable rather
than RG-58. RG-8 is a lower loss cable, meaning that more of your signal will reach the antenna.
Long cable runs can result in signal degradation due to the “loss” characteristics of the cable. When using
RG-58 with a 72 MHz transmitter, there is an average* loss of 4 dB per 100 feet of cable and at 216 MHz using
RG-58 an average* loss of 8 dB per 100 feet of cable. (A 3dB loss means half of your power has been lost.)
However, it is better to suffer coaxial power loss than to try to shoot your signal through obstacles! Obstacles,
especially metal, can create drop-outs or reflections of your signal that will result in poor listening conditions.
*NOTE: There are many varieties of 50 ohm, RG-58 and RG-8 cables. You may purchase a
cable that is better or worse than this value. Please check with the cable vendor or
manufacturer for exact specifications.
For proper and dependable operation, Listen receivers need to receive a strong and consistent signal from the
originating transmitter. Note that on portable receivers the headset wire is the receiving antenna. The following
strategies should be used maximize this signal:
1. When designing and installing your system, keep in mind that the location of both the transmitting and
receiving antennas is critical to maximize broadcast range.
2. Eliminate or minimize obstructions between the transmitting and receiving antenna.
3. Minimize the distance between the transmitting and receiving antennas.
4. Move transmitting and receiving antennas away from metal or conductive objects.
5. Place the transmitting antenna as high as possible.
6. Orient both transmitting and receiving antennas vertically.
7. Position the RF Power switch on the back of the LT-800 to full RF Power, unless lower power is necessary
(see page 8).
8. Keep coaxial cable from transmitter to antenna as short as possible.
CAUTION: When installing antennas, ensure the antenna is clear of power lines.
Coaxial cable, connectors, and optional antenna mounting kits are available from Listen. See page 22, visit
www.listentech.com, or ask your dealer for details.
RF Reception Maximization Strategies
Coaxial Cable
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Productinformatie
| Merk | Listen |
| Model | LT-803-072-01 |
| Categorie | Niet gecategoriseerd |
| Taal | Nederlands |
| Grootte | 4905 MB |
