Listen LT-700 User Manual page 23

Channel Selection continued
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, press both the UP and DOWN buttons simultaneously for 5 sec-
onds. Repeat the process to unlock.
Notes in regard to using 72MHz and 216MHz systems:
i. 72MHz in 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.
ii. 216MHz 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 chan-
nels 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
216MHz band due to channel 13, it is recommended that you switch to a
72MHz system.
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 72MHz 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 216MHz 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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