Uniden UH-057 - Manual (Page 22)

Simplex / Duplex Communication
Duplex Operation allows the Uniden Sundowner UH-057 to
operate via a repeater station on Channels 1 through 8.
The set receives on these channels but transmits on
Channels 31 through 38 respectively.
When Duplex operation is disabled, the set receives and
transmits on the same channel, (Simplex Communication)
To activate Duplex operation on a Channel where Repeater
Service is available, select the channel and then press the
DIJP
O button. DUP indicator appears on the LCD Display.
To put the Duplex programmed channel back to-normal
Simplex operation, select the channel and press the O
button again. DUP indicator disappears trom the LCD
Display.
Low Battery Level Detection
Uniden Sundowner UH-057 has a built-in battery level
detector circuit. It evaluates your Battery Pack everytime
you transmit to determine whether the power inside the
Battery is still sufficient enough to support normal Receive
and Transmit communications.
The circuit will inform you in two ways.
1. When the PTT switch is pressed and the TX LED blinks.
It means the battery level is already low and needs
recharging. You can still transmit, however, you must
finish the conversation and have your battery charged
fully to resume normal operation.
2. When the Blinking TX LED went unnoticed and the
Battery goes down to where normal communication can
no longer be supported, the circuit will disable the PTT
switch and emit an error tone everytime you try to
transmit. Have the battery pack charged fully.
UH-057 Page 20