Uniden UH-057 - Manual (Page 23)

Special Feature
SELECTIVE CALLING
Selective Calling (SELCALL) is a special Sequential Tone
Squelch System that allows the user to receive/transmit
calls selectively from/to an individual or a group, on a
shared busy channel.
The Sundowner UH-057 has Selective Calling (SELCALL)
system specially built-in. With exceptional features like
Receiver Quieting, Group Calling, and User Programmable
Parameters makes the Sundowner UH-057 superior to any
of its kind.
Receiver Quieting (Tone Squelch)
When enabled, it automatically mutes the receiver audio
circuit of the Radio. It will stay on its "Quiet Mode", as long
as the required Selcall tone code (SELCALL ID) to open the
muting circuit is not received.
Tone Squelch Scanning
Scans Tone Squelched Channels only.
Group Calling Capability
Transmits and Responds to Group Calls.
User-Programmable SELCALL Parameters
Gives the user freedom to program and configure the
SELCALL parameter for efficient Selective Calling communi­
cation.
Page 2i UH-057