Midland Sp-400 Transceiver Users Guide

SP-400 Series User’s Guide  
[8] PTT (Push to talk) button. The PTT button must be pressed 
while you speak into the microphone. Release the PTT button to 
receive transmissions from other radios. 
[9] Lower function (scan) button. The lower function button 
performs two functions. The primary function is activated by a 
brief button press (press and release) and the secondary 
function is activated by pressing the button for more than two 
seconds (press and hold): 
 If you press and release the lower...

 SP-400 Series User’s Guide 
Setup 
Unpacking 
The following items are supplied in the standard package: 
5 One transceiver (SP-410, SP-420, SP-430 or SP-440) 
5 One battery pack (18-B02) 
5 One belt clip (81-BC1) 
5 One plastic accessory dust cover 
5 One rubber easy access dust cover 
5 One user’s manual 
If something is missing please promptly advise your supplier. 
Attaching and removing the antenna 
To attach the antenna: 
1. Locate the antenna terminal (threaded female connector) on 
transceiver’s...

SP-400 Series User’s Guide  
Installing and removing the battery pack 
To install the battery pack: 
Hold the transceiver’s body with one hand and the battery pack 
with the other. 
1. Slide the bottom of the 
battery pack into the s
on the bottom of the 
transceiver. 
lots 
2. Gently push the top of 
the battery pack toward 
the transceiver until a 
click is heard. The 
battery pack will snap 
into place and should be 
firmly locked. 
To remove the battery pack: 
1. Press the battery release 
button...

 SP-400 Series User’s Guide 
To install the belt clip onto the battery pack’s body: 
1. Slide the clip into the 
appropriate guides 
located on the back of 
the battery until it firmly 
locks. 
To remove the belt clip: 
2. Gently lift the belt clip 
release. 
3. While lifting the belt clip release slide the belt clip off the 
battery. 
Charging the battery pack 
The battery pack should be charged prior to use. To charge the 
battery pack you should setup the charger and insert the radio 
(or battery) as...

SP-400 Series User’s Guide  
contacts of the battery pack must make contact with the 
three contacts inside the cradle). The LED indicator will 
glow red indicating the battery is charging. 
5. The rapid charger will fully charge the 1300 mAH NiMH 
battery in approximately 1.5 hours. The rapid charger will 
change to a green LED and switch to a trickle charge rate 
when a full charge is detected. The standard rate charger 
will charge the battery in about 12 hours. 
 Removing the battery before it is...

 SP-400 Series User’s Guide 
Basic Operation 
This section describes many of the standard functions available 
on your SP-400 series radio. Many aspects of the radio can be 
changed or customized to suit the requirements, so not all 
functions may be available or operate as described. 
 Due to the programming options of the radio, certain 
functions may be disabled or operate differently than 
described here. If in doubt please contact your dealer or 
communications coordinator for further details....

SP-400 Series User’s Guide  
call operation. The following paragraphs describe these modes 
of operation. Ask your dealer or communications coordinator if 
you have questions on how your radio has been programmed to 
operate. 
Carrier squelch operation 
A signal that matches the programmed receive frequency will be 
heard if it is of sufficient strength to exceed the squelch 
threshold. An on frequency signal exceeding the squelch 
threshold level will be indicated by a steady green status LED....

 SP-400 Series User’s Guide 
2-tone/selective call operation 
2-tone or selective call signaling allows individual or group calls 
to be made to your radio. The radio may have been programmed 
to mute all receive signals until a 2-tone or selective call signal 
has been decoded. When the programmed 2-tone or selective 
call signal is decoded, the status LED will blink green, a ring tone 
may sound, and subsequent receive audio will be heard over the 
speaker. After the call has been acknowledged, by...

SP-400 Series User’s Guide  
released within two seconds the monitor function will deactivate 
when released. If the upper function button is held pressed for 
more than two seconds the monitor function will latch on. Press 
and release the upper function button again to deactivate the 
latched monitor function. 
 When the monitor function is activated a high pitched 
beep will sound and the status LED will light amber. 
When the monitor function is turned off a low pitched 
beep will sound and the...

 SP-400 Series User’s Guide 
 The radio might be programmed with a timeout timer 
which will automatically end your transmission after a 
preset time. In this case release PTT and wait for a few 
seconds. The radio transmitter will be enabled again 
after a few seconds. Ask your dealer or communications 
coordinator for further details. 
 The radio might be programmed for busy channel lock 
out, which automatically disables the transmitter if your 
channel is busy. In this case wait until the channel...