Kenwood TK-690 - Manual (Page 18)

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SP (Speaker Internal/ External)
Press this key to switch between “Internal” and “External” speaker. When
“External” is selected, a tone sounds and the SP icon appears on the display.
You can use this function while scanning and receiving a call. However, all
audio will be emitted from the PA speaker.
SPM (Speaker 1-2 Mute)
This feature requires dual head configuration. Press this key to disable the
speaker audio from the other control head. When pressed, a tone sounds
and MUTE appears on the display with the muted head number.
SQ (Squelch Level)
You can manually adjust the squelch level using this function:
1 Press the SQ key. A tone sounds and SQL (or SQUELCH) appears on the
display with the current squelch level.
2 Press the GRP Up/ Down keys, or use the CH control to select the
desired level.
3 Press the SQ key. A tone sounds and the display returns to the normal
channel.
TA (Talk Around)
Press this key to make a call without using a repeater. When you activate this
function, a tone sounds and tA (or TA) appears on the 3-digit display. This
function is useful when you are close to the mobiles you want to talk to.