Midland Sp-400 Transceiver Users Guide

User’s Guide 
 
 
SP-400 Series Portable 
 
4/16 Channel VHF-FM Portable Transceiver 
4/16 Channel UHF-FM Portable Transceiver 
 
 
 
 
 
 
 
 
 
 
 
 
www.midlandradio.com  

 SP-400 Series User’s Guide 
2 © 2005, Midland Radio Corporation 
FCC RF EXPOSURE COMPLIANCE REQUIREMENTS 
FOR OCCUPATIONAL USE ONLY 
The Federal Communications Commission (FCC), within 
its action in General Docket 93-62, November 7, 1997, 
has adopted a safety standard for human exposure to 
Radio Frequency (RF) electromagnetic energy emitted 
by FCC regulated equipment. Midland Radio Corporation 
subscribes to the same safety standard for the use of its 
products. Proper operation of this radio will...

SP-400 Series User’s Guide  
Contents 
Conventions and Symbols in this Book...................................4 
Disclaimer........................................................................\
........5 
Safety........................................................................\
...............5 
Introduction........................................................................\
......7 
Radio models.......................................................................7 
Radio...

 SP-400 Series User’s Guide 
Sending a 2-tone/selective call or emergency call.............20 
Scanning channels.............................................................21 
Advanced Operations............................................................24 
Operating hands-free.........................................................24 
Using the scrambler...........................................................25 
Editing your scan list..........................................................25...

SP-400 Series User’s Guide  
Disclaimer 
Midland Radio Corporation is committed to continuous quality 
improvements, for this reason specifications may change without 
prior notice. 
Every effort has been made to ensure that the information in this 
document is complete, accurate, and up-to-date. Midland 
assumes no responsibility for the results of errors beyond its 
control. The manufacturer of this equipment also cannot 
guarantee that changes in the equipment made by unauthorized 
people will not...

 SP-400 Series User’s Guide 
 Do not operate the radio near unshielded electrical 
blasting caps or in an explosive atmosphere. 
 Do not transmit without the antenna attached to the 
radio. Though designed for protection against damage, 
damage to the transmitter may occur. 
 Respect the environmental conditions. The radio is 
designed to operate in harsh environments, but avoiding 
extended or unnecessary exposure will prolong the 
service life. 
 Never attempt to disassemble or service the radio...

SP-400 Series User’s Guide  
Introduction 
Congratulations! By choosing the Midland SP-400 series, you 
have selected a professional grade portable radio. Its rugged 
design will provide years of reliable service and its sophisticated 
software allows many customizable options. 
Radio models 
There are four models in the SP-400 series portable radio line. 
The models differ only by band of operation and channel 
capacity. 
SP-410 – 4 channel VHF, 148-174 MHz. 
SP-420 – 4 channel UHF, 440-470 MHz....

 SP-400 Series User’s Guide 
47 CTCSS tones and 104 DCS codes programmable per 
channel. 
5 2-tone decode – your radio may be programmed to 
respond only when paged with a two-tone sequence. 
Two sequences selectable per channel and up to 15 
different sequences programmable per radio. 
5 VOX (voice operated transmit) – allows hands-free 
operation using an optional headset/microphone. 
5 Voice inversion scrambler – for secure 
communications. Radio communications are encoded 
and decoded, when...

SP-400 Series User’s Guide  
Radio Controls 
Please read this section to familiarize yourself with the 
transceiver’s controls. 
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© 2005, Midland Radio Corporation 9  

 SP-400 Series User’s Guide 
Top 
[1] Channel selector knob. Rotate this knob to select the 
operating channel. 
[2] Power ON/OFF knob. Rotate this knob clockwise to turn the 
transceiver on (counterclockwise to turn off). 
[3] Status LED. Tri-color LED lights and flashes at different rates 
to indicate operating conditions. 
Front 
[4] Speaker. Receive audio will be heard from the built in 
speaker located in this area. 
[5] Microphone. The internal microphone is located here. 
Side (right) 
[6]...