Listen LT-803-072-01 handleiding
Handleiding
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13
It is important to choose channels that are free from interference to
achieve proper operation of your Listen equipment. This process is trial
and error. Before turning on the transmitter, listen to the wide band
channels on the receivers (lettered channels at 72 MHz and channels that
start with a “2” for 216 MHz when using a Listen receiver). Listen to the
audio through the headphone or via the speaker and choose a channel
with the least amount of interference. Unless you are interfacing with an
existing narrowband transmission system, always use a wide band channel.
If you are using multiple channels follow this process:
1. Same Space If you are using multiple transmitters in the same space,
the highest number of channels that will work simultaneously is six at
72 MHz and three at 216 MHz. With all of the transmitters off, listen
for interference on all the wide band channels with a Listen receiver.
Using the frequency compatibility tables on pages 14-16, eliminate any
channels that have noticeable interference. Now choose the channels
with the widest channel spacing. It is recommended that adjacent
channels be spaced at least 300k Hz apart. If there is no interference
the following channels are recommended. For a 72 MHz system, use
channels A, C, E, I, J and H. For a 216 MHz system, use channels 2A, 2K
and 2V.
2. Distributed Spacing If you are using transmitters that are distributed
over a large area, you can achieve more simultaneous broadcast
channels. However, it is critical that your receiver(s) be located as close
to its transmitter as possible. You can use adjacent channels (see
frequency compatibility tables (on pages 14-16) in this case as long as
the adjacent channel transmitter is at least 50% further away from the
receiver than the original transmitter. Example: The transmitter for the
receiver on channel E is 100 feet from the receiver. The adjacent channel
transmitter on channel D should be at least 150 feet away.
It is highly recommended that after channel selection has been achieved,
you lock the channel so that it cannot be changed by the user. To
accomplish LOCK on the LT-800/LT-803, press the “UP” button for 3
seconds. Repeat the process to unlock.
Notes in regard to using 72 MHz and 216 MHz systems:
1. 72 MHz is a secondary frequency band. This means that other
transmitters are licensed to use these frequencies. Thus, you may
experience interference from paging transmitters and other types of
transmissions. You will need to find a clear channel by listening
to all the wide band channels.
2. 216 MHz is a primary frequency band and no other types of
transmissions are authorized to use it. Thus, you will find the
highest probability of clear channels in this band. However, you may
experience intermodulation of the TV Channel 13 aural carrier if there is
a channel 13 transmitter in your area and you are close
to the transmitter. If you cannot find a clear channel in 216 MHz band
due to channel 13, it is recommended that you switch to
a 72 MHz system.
Channel Selection
Wide Band
Recommendation
Listen recommends that
you always use a wide band
channel unless you need to
be compatible with existing
narrow band receivers from
other manufacturers. Wide
band channels have lower
noise than their narrow band
counterparts.
At 72MHz
The LT-800 at 72 MHz
operates on 17 wide band
channels and 40 narrow
band channels.
• Letters= Wide Band
Channels (Example: E)
• Numbers= Narrow Band
Channels (Example: 32)
At 216MHz
The LT-800 at 216 MHz
operates on 19 wide band
channels and 38 narrow
band channels.
• “2” as left digit= Wide Band
Channel
(Example: 2C)
• “1” and “3” as left digits=
Narrow Band Channels
(Examples: 1A; 3R)
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Productinformatie
| Merk | Listen |
| Model | LT-803-072-01 |
| Categorie | Niet gecategoriseerd |
| Taal | Nederlands |
| Grootte | 4905 MB |
