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productmanual 11x17.qrk
10/11/99 2:43 PM
Page 10
LT-800 Stationary Transmitter, Operation & Selecting a Channel
Operating the LT-800
1
Make sure the unit is powered on.
Press POWER button and verify power
connections. When "ON", display should be lit.
2
Select a channel –
Select the channel to transmit
on to by pressing the channel UP and DOWN buttons. See
"Selecting a Channel to Transmit On" to the right.
Can't change the channel? It may be locked. Press both the
UP and DOWN buttons simultaneously for 3 seconds until the
decimal dot next to the channel turns off. Press again to lock in
new channel, if desired.
At 72MHz:
The LT-800 at 72MHz operates on 17 wide
band channels and 40 narrow band channels:
Letters = Wide Band Channels
Numbers = Narrow Band Channels
At 216MHz:
The LT-800 at 216MHz operates on 19 wide
band channels and 38 narrow band channels:
"2" as left digit = wide band channel
"1" and "3" left digits = narrow band channels
Please refer to the Frequency Compatibility Tables (Pages 28-31) for
specific frequencies and compatibility with other manufacturers.
4 NOTE: Operating on a narrow band channel will have less
fidelity and more noise.
3
Test Tone, if necessary:
To broadcast a tone, press the
test tone button. This button is used to tune other manufacturer
receivers or to identify a particular channel on a receiver.
10
LISTEN TECHNOLOGIES CORPORATION +1.435.647.0318 1.800.330.0891 Fax: +1.435.647.0316
Internet: www.listentech.com
All specifications are subject to change without notice.
Selecting a Channel to Transmit On
Selecting a clear channel to broadcast is important for interference-
free broadcasting.
Wide Band Recommendation –
If you don't plan to have
other transmitters (or a limited number) operating in the same area,
it is recommended that you use wide band channels. These are the
most common channels used. Many people own receivers that will
operate on these channels. In addition, wide band channels offer
the best fidelity and the lowest noise. In this case, select one of the
17 wide band channels A through R on 72MHz systems (19 wide
band channels beginning with "2" on 216MHz systems). The best
way to select a channel is by trial and error. Try a channel, if it has
low interference and reliable performance, stick to that channel.
Compatibility with other manufacturers
– If you are
using other manufacturer's receivers with the LT-800, find out their
frequency, then refer to Listen's Frequency Compatibility Tables
(Pages 28-31) to find the LT-800 channel number or letter that
corresponds with the receiver's frequency. As much as possible,
Listen has duplicated the wide band channel letters to cover
frequencies of other major brands. However, we recommend
verifying corresponding channel numbers and letters on the tables
on pages 28-31.
If you are using other manufacturer's receivers and the sound is
distorted, it is probably because the receiver is not designed to
handle the ±25kHz deviation of the Listen transmitter. This can be
corrected by turning the PROCESSOR control knob all the way counter-
clockwise and turning the INPUT LEVEL knob down. Or, call Listen
Technical Service (Page 4) to adjust the transmitter deviation internally.
Several transmitters operating in the same
environment
– For this, you'll need to choose your transmitting
frequencies carefully. The following guidelines should be used to
choose channels:
a. If possible, use all wide band channels. These channels
offer better fidelity and lower noise.
b. Select channels that have the highest frequency separation as
possible (see Frequency Compatibility Tables, pages 28-31), to avoid
adjacent channels and interference. Channels should be at least
200kHz apart.
c. Through a process of trial and error select a combination of
channels that offer the lowest interference and highest reliability.
Listen Receivers: LR-500 and LR-400, Locking & Indicators
Locking into Only One Channel
Receiver LED Indicator
Steady Green LED =
When locked, the unit will display
Proper Operation
the LOCK symbol.
Slow Flashing = Battery
is Low
To lock
the receiver so users
Slow Flashing when
cannot change the channel, press
Charging = Unit is
the SEEK button until the LOCK
Charging
symbol is displayed.
To unlock
the channel, press
and hold down the SEEK button
until the LOCK symbol disappears
on the display.
LR-400 and LR-500 Receivers: Look & Listen
Small dots indicate the relative RF signal strength. When there is no
signal the unit is squelched and the LISTEN logo in extinguished.
When the LISTEN logo is
displayed, the unit is
CH
operating normally
TM
Indicates the unit is in
PGM
L/O
PROGRAM mode (to
enter PROGRAM mode,
press UP and DOWN
In PROGRAM mode (PGM
In OPERATING mode, this icon indicates the
until the PGM symbol
symbol is displayed), icon
channel is locked and cannot be changed by
on the LCD display is
indicates the channel is
the user (to lock/unlock, press the SEEK button
shown.)
locked out and the user does
until the LOCK symbol on the LCD display is
not have access to the
displayed / not displayed).
channel.
LISTEN TECHNOLOGIES CORPORATION +1.435.647.0318 1.800.330.0891 Fax: +1.435.647.0316
Internet: www.listentech.com
All specifications subject to change without notice.
™
Display Descriptions
Letters and numbers indicate the channel the unit is tuned to.
Battery indicator – flashes slowing when
charging, quickly when almost discharged
TM
23
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