Midland 79-290 Transceiver Manual

 
2 TABLE OF CONTENTS
 
Specifications 
Installation 
Location 
Mounting the Radio 
Ignition Noise Interference 
Antenna 
Tuning the Antenna for Optimum SWR 
External Speaker
    
Operation 
Control and Indicators 
Front Panel 
Real Panel 
Operating Procedure to Receive 
Operating Procedure to Transmit 
Receiving SSB signals 
 
SPECIFICATIONS (CB) 
GENERAL 
Channels  40 CH/AM//USB/LSB (120 ch. total) 
  
Frequency Range  26.965 + 27.405 CB 
  
Frequency Control  Phase Lock Loop (PLL) synthesizer...

 
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TRANSMITTER 
Power Output    AM 4 Watts 
  SSB 12 Watts PEP 
 
Modulation  AM/SSB                         
                           
Intermodulation SSB 3
rd order, more than -25 dB 
Distortion        5th order, more than -35 dB     
                          
SSB Carrier Suppression  55 dB 
 
Unwanted Sideband  50 dB 
Frequency Response    AM 350 to 2500 Hz 
RECEIVER 
Sensitivity         .50 uv AM 
         .25 uv SSB 
 
 
IF Frequency  AM/FM: 10.695 MHz 1st IF,  455 kHZ 2nd 
IF  SSB: 10.695 MHz...

 
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Your new Midland model 79-290  represents cutting edge technology  in the 
communications field. From its high tech detachable control panel  to finned  cast 
almuinum transmitter heatsink  it incorporates features found on no other CB. 
These features include full surface mount technoloy, fiberglass printed circuit 
board, dual power output stage, and a digital  information screen using a black 
matrix LCD (liquid crystal display).  All the features are under microprocessor 
control for increased...

 
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Use of a mobile receiver at low signal levels is normally limited by the presence 
of electrical noise. The primary source of noise in automobile installations is from 
the vehicle itself. If the CB operates quietly with the car motor turned off it’s 
most likely that the car electrical system is generating noise. In some installations 
ignition interference may be high enough to make good communications 
impossible. The electrical noise may come from several sources. Many 
possibilities exist and...

 
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antenna is shortened. By continuing to shorten the antenna you will notice the 
SWR reading will reach a low point and then start rising again. This means that 
you have passed the optimum point for Channel
 20. Extend the antenna a short 
distance and again follow the procedure above. 
 
B.  Antennas which must be cut to proper length. 
1.  Follow the same procedure as above, but adjust the length by cutting 1/4 in. 
increments until a good match is obtained. 
2.  Be very careful not to cut too much...

 
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FRONT PANEL DRAWING 
 1. ON/OFF VOLUME (inner dual concentric). Turn clockwise to apply 
power to the unit and to set the desired listening level. During normal CB 
operation, the VOLUME control is used to adjust the output level obtained 
either at the transceiver speaker or the external speaker, if used. 
 
2. SQUELCH (outer dual concentric). This control is used to cut off or 
eliminate receiver background noise in absence of an incoming signal. For 
maximum receiver sensitivity it is desired that...

 
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 6. WX BUTTON. Press this button for instant selection of the NOAA 
weather bureau or Canadian receiver. Select the proper channel, with the 
rotary channel selector, for your area. It is normal to hear the same 
information on more than one channel, select the channel with best sound. 
To return to CB operation, push the WX button again. 
   
 7. MEMORY CHANNEL INDICATOR. LCD indicator showing which 
memory channel has been selected (1 - 4). 
 
  8. TX INDICATOR. This indicator on the LCD screen...

 
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  16. SC INDICATOR.  LCD indicator showing when the scan mode is 
activated. 
 
 17. MIC INDICATOR. LCD indicator showing when the low power 
microphone mode has been selected. 
 
 18. LOC INDICATOR. Indicates the local mode of receive has been 
selected.  
  
  19. FRQ BUTTON. Pressing this button causes the LCD to switch between 
channel and 5 digit frequency display. 
 
  20. CH 9 BUTTON. Pressing this button causes instant selection of 
emergency channel 9. The LCD display of channel/frequency...

 
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PRESS-TO-TALK MICROPHONE 
The receiver and transmitter are controlled by the press-to-talk switch on the 
microphone. Press the switch and the transmitter is activated, release switch 
to receive. When transmitting, hold the microphone 2 in. from the mouth and 
speak clearly in a normal ‘’voice’’. The radio comes complete with a low-
impedance (500 ohm) dynamic microphone. 
 NOTE: The receiver audio will not function unless the microphone is  
 connected 
  
  26. LCR BUTTON. Pressing this button...