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SP-400 Series User’s Guide
Quick Reference
Controls function table
Control Operation Function
On/off knob Turn clockwise past detent Turns the radio on
On/off knob Turned further clockwise Increases the speaker volume
Channel knob Rotated while scan is off Selects channel of operation
Channel knob Rotated while scanning May select the scan transmit
channel, as programmed
PTT button Pressed while scan is off Transmits on selected channel
PTT button Pressed while scanning Transmits on the scan transmit
channel, as programmed
Upper function
button
Pressed < two seconds Monitor on
Upper function
button
Released in < two seconds Monitor off
Upper function
button
Pressed > two seconds Latches the monitor on/off
Upper function
button
Pressed while transmitting Sends Call 1, if programmed
Upper function
button
Pressed and released
while scan is holding
Nuisance channel delete
Upper function
button
Pressed while radio is
turned on
Places radio in program mode
Lower function
button
Pressed and released Toggles scan on/off
Lower function
button
Pressed > two seconds
while scan is off
Toggles channel in or out of
scan list
Lower function
button
Pressed when radio is
turned on
Toggles scrambler on/off, if
enabled
Lower function
button
Pressed while transmitting Sends Call 2, if programmed
Lower + Upper
function buttons
Pressed and released
while VOX enabled
Toggles VOX sensitivity
Lower + Upper
function buttons
Pressed > two seconds Sends emergency call, if
programmed
Lower + Upper
function buttons
Pressed when radio is
turned on
Toggles VOX mode on/off, if
enabled
32 © 2005, Midland Radio Corporation