Selecting A Channel To Transmit On - Listen Technologies LT-800 User Manual

productmanual 11x17.qrk 10/11/99 2:43 PM Page 15
LT-700 Portable Transmitter, Battery Recharging
Charging the Batteries (continued)
Install NiMH rechargeable batteries
4. in the battery
compartment, ensuring that proper polarity has been observed.
Note:
It is recommended that you only use a Listen charging
transformer. Or, set the LT-700 with NiMH batteries within unit
and powered ON in a Listen Battery Charging Tray.
For charging using a transformer: with NiMH batteries in unit,
plug wall transformer in CHARGING connection and into wall outlet
(as shown). Batteries will be fully charged when red LED shines
solid red. (LED and battery symbol will flash slowly while charging.)
The LT-700 must be powered ON initially to
5.
charge NiMH batteries within unit –
Connect the wall
transformer to the LT-700. The unit must be on to charge.
However, once the charger has started, the unit can be turned off.
6. Once the batteries are fully charged, the unit will stop charging
the batteries. Full-charge will be indicated when all the battery
symbol segments are illuminated and the LED near the volume
control is glowing steadily.
7. The unit can be operated while batteries are charging.
18 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.
Operating the LT-700 with a Wall
Transformer
1. The unit will operate normally when connected to a wall
transformer.
2. Batteries do not need to be installed in the unit to operate
using a wall transformer.
LT-700 Portable Transmitter, Selecting a Channel
Selecting a Channel 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 the 72MHz system, or one of the
19 wide band channels on the 216MHz system labeled 2A, 2B, 2C,
etc. 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-700, find out their
frequency, then refer to Listen's Frequency Compatibility Tables
(Pages 28-31) to find the LT-700 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
LT-700 Look & Listen ™ Display Descriptions
Indicates the unit is in PROGRAM
mode (to enter PROGRAM mode, press
L/O = Locked Out – while in
UP and DOWN until the PGM symbol
PROGRAM mode, L/O shows what
on the LCD display is shown.)
Indicates unit is
channels are locked in or out
locked into channel,
press and hold UP or
DOWN button for 3
seconds to unlock
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.
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, contact Listen Technical
Service (Page 4) to adjust the transmitter deviation internally.
Several transmitters operating in the same
environment
– For this, you will 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. Selected 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.
Channel the unit is tuned to
Indicates battery level in 3 stages,
flashes when battery is low along with
flashing red LED
TM
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