Midland 77-120esp Transceiver Owners Manual

Owner’s Manual 77-120 ESP 
 www.midlandradio.com    Page 1 of 13 
 
 
 
Owner’s Manual 77-120ESP 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
http://www.midlandradio.com  

Owner’s Manual 77-120 ESP 
 www.midlandradio.com    Page 2 of 13 
Table of Contents 
 
I. Introduction 
II. How to install your Midland mobile CB 
III.  Check the requirements for your vehicle before you begin installation 
IV. 
Installation and operating accessories furnished with your Midland CB 
V. 
Where to locate your CB transceiver 
VI.  Mechanical Mounting  
VII.  Power wiring (negative ground only) 
VIII. 
Mounting the main unit 
IX. 
Installation of microphone hanger 
X. 
Antenna 
a.  How to...

Owner’s Manual 77-120 ESP 
 www.midlandradio.com    Page 3 of 13 
Introduction - 
 
Your 40 channel CB represents the state of the art in high tech engineering. This 
unit is not only a full feature CB transceiver but incorporates a high performance 
10 channel NOAA weather bureau VHF receiver. The full 10-channel weather 
receiver allows use on all current and future NOAA weather bureau channels 
plus Canadian and international channels. The unit incorporates microprocessor 
controlled PLL circuitry for...

Owner’s Manual 77-120 ESP 
 www.midlandradio.com    Page 4 of 13 
 
Mechanical mounting 
 
Note: Extreme care should be exercised when drilling into dash to avoid damage 
to under-dash electronic ignition, cruise control, instrument and / or accessory 
wiring. Your unit must be mounted so as not to interfere with air bag (SRS) 
operation.
 
 
Step 1: Heeding the caution, use the mounting bracket as a template for marking 
the location of screw holes under the dash.  Use an awl, nail or other sharp...

Owner’s Manual 77-120 ESP 
 www.midlandradio.com    Page 5 of 13 
Mounting the main unit. 
 
Step 1: Position the main unit between the bracket arms in line with the retention 
knobs.  Set the angle for optimum operating comfort and accessibility. 
 
Step 2: Tighten the retention knobs. 
 
Installation of microphone hanger. 
 
Mounting holes are provided on the microphone hanger bracket.  The bracket 
can be attached to the vehicle dash, or other convenient location....

Owner’s Manual 77-120 ESP 
 www.midlandradio.com    Page 6 of 13 
Antenna -  
 
How to select, position install and tune the right one for you? 
 
  Basically, you have two types of mobile CB antennas - full-length whip and 
loaded whip - and a variety of types of mounts (depending on where you locate 
your antenna) to choose from. 
 
Midland markets a broad line of high-performance antennas. The dealer who 
sold you your Midland CB can advise which type is best for you. 
 
 
Where you locate your...

Owner’s Manual 77-120 ESP 
 www.midlandradio.com    Page 7 of 13 
Tuning your antenna. 
 
Some antennas are factory tuned.  However, performance can usually be 
improved by slightly lengthening or shortening its length, using a Standing Wave 
Radio (SWR) meter.  For the exact procedures to be used refer to the antenna 
manufacturer’s installation manual. 
 
You can buy an SWR meter separately or have your antenna checked by your 
Midland CB Dealer’s service department or a two-way comm shop....

Owner’s Manual 77-120 ESP 
 www.midlandradio.com    Page 8 of 13 
FUNCTION AND LOCATION OF CONTROLS 
 
 
 
FRONT PANEL CONTROLS 
 
1
. MICROPHONE CONNECTOR: Plug in the supplied microphone to this  
    connector. The collar ring has a screw on locking ring. Push the ring onto  
    the units collar and screw on until it is tight.  
 
2. 
ON/OFF VOLUME: In the off position your transceiver’s power is off. Turn  
    this control clockwise to switch on the unit and adjust the volume. 
 
3. 
MIC GAIN:...

Owner’s Manual 77-120 ESP 
 www.midlandradio.com    Page 9 of 13 
    
6. 
ROTARY CHANNEL SELECTOR: This easy to operate control allows 
    changing of weather or CB channel, either up or down. This control will 
    not operate when emergency channel 9 has been selected by using the 
    “CH9” button or when the channel “LOCK” function has been activated.  
 
7. 
CHANNEL DISPLAY: LCD (liquid crystal display) read-out of selected CB  
    or weather channel. 
 
8. 
FREQUENCY DISPLAY. Displays channel...

Owner’s Manual 77-120 ESP 
 www.midlandradio.com    Page 10 of 13 
EXT SPEAKER JACK: When a speaker is connected to this jack the  
      internal speaker is by-passed. All received signals will be heard through  
      the external speaker when it is connected. The speaker connected to the   
      “EXT” jack should be rated at 8 ohms and 5 watts or more. 
 
 
HOW TO OPERATE YOUR TRANSCEIVER FOR CB USE 
 
You should become familiar with the controls and complete the preceding 
installation instructions...