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- 8 -

5.

 

DIMMER CONTROL :

 This knob controls the level of brightness for the 

meter lamp and the channel display. Also, pushing this knob turns the meter 
lamp and the display LED's on and off. 

 

6.

 

RF POWER CONTROL : 

This control allows the user to adjust RF power 

output.  

 

7.

 

CHANNEL SELECTOR :

 This control is used to select a desired transmit 

and receive channel. 

 

8.

 

FRONT PANEL METER :

 The Front Panel Meter allows the user to monitor 

signal strength, RF output power, SWR level and the AM Modulation level. 

 

9.

 

TALKBACK CONTROL :

 Pushing this knob turns the Talkback circuit on 

and off. Adjust this knob for desired volume of Talkback. This is used to 
monitor your own voice. For example, you could use this feature to compare 
different microphones. 

 

10.

 

CLARIFIER :

 Allows tuning of the receive frequency above or below the 

channel frequency by up to 1.0 KHz.

 

 

 

11.

 

SWR/MOD/PWR SWITCH :

 This switch controls the function of the meter 

during the transmit mode. In the "SWR" position, the meter indicates the 
Standing Wave Ratio (SWR) of your antenna. There are no adjustments 
because the SWR circuit in this radio calibrates itself automatically. When the 
switch is in the "MOD" position, the green scale on the meter indicates your 
percentage of modulation. When this switch is in "PWR" position, the meter 
indicates your power output. 

 

12.

 

NB/ANL/OFF SWITCH :

 In the "ANL" position, the Automatic Noise 

Limiter is activated. In the "NB/ANL" position, the Noise Blanker is also 
activated. The Noise Blanker is very effective in eliminating repetitive impulse 
noise such as ignition interference. 

 

13.

 

PA/CB

/RB

 SWITCH :

 In the "PA" position, your voice will come out of the 

speaker that you need to plug in to the "PA. SP." jack on the back of the radio. 
The radio does not operate when you are in the "PA" mode. The "CB" mode is 
normal operation of the radio. In the "RB" mode, you are in CB operation but 
the Roger Beep is engaged. When the Roger Beep is on, the radio transmits an 
audio tone at the end of your transmission. This indicates the end of your 
transmission so that people who are having trouble hearing you will know that 
you are done speaking. As a courtesy to others, use the Roger Beep only when 
necessary. 

 

 

- 9 -

14.

 

Display ON/OFF

 

SWITCH : 

When the switch is in the F.D.OFF position, the 

frequency Display is OFF. 

 

15.

 

TONE SWITCH HI/MED/LO :

 This switch changes the tone quality. In LO 

position, bass is increased and in HI position, treble is increased. 

 

16.

 

CHANNEL DISPLAY :

 The blue illuminated channel display indicates the 

current selected channel. 

 

17.

 

SWR ALERT LED :

 This LED lights red when your SWR is higher than 

about 3:1. This is not an exact indicator of 3:1 SWR, but it is an indication that 
you should check your SWR reading. 

 

18.

 

R.B. LED :

 This lights green when the Roger Beep is on. 

 

19.

 

RX/TX LED :

 This LED is green during receive and red during transmit. 

 

20.

 

FREQUENCY COUNTER :

 This blue illuminated display indicates the 

frequency of the selected channel. 

 

Summary of Contents for DX-939

Page 1: ...rference 4 Antenna 4 Tuning The Antenna For Optimum SWR 5 External Speaker 6 Public Address 6 CHAPTER 3 Operation Control Functions 7 Front Panel 7 Rear Panel 10 Frequency Chart 11 Procedure to Receive and Transmit 12 Receiving SSB Signals 13 Alternate Microphone and Installation 15 Maintenance And Adjustment 18 A Few Rules That Should Be Obeyed 19 How Your CB Can Serve You 19 Use Channel 9 For Em...

Page 2: ...y strong Also provide a good electrical grounding connection to the chassis of the vehicle Proceed as follows to mount the transceiver 1 After you have determined the most convenient location in your vehicle hold the transceiver with mounting bracket in the exact location desired If nothing will interfere with mounting it in the desired position remove the mounting bolts Before drilling the holes ...

Page 3: ... a boat the transceiver will not operate at maximum efficiency without a ground plate unless the vessel has a steel hull Before installing the transceiver in a boat consult your dealer for information regarding an adequate grounding system and prevention of electrolysis between fittings in the hull and water 5 TUNING THE ANTENNA FOR OPTIMUM S W R Since there is such a wide variety of base and mobi...

Page 4: ...from the microphone to prevent acoustic feedback Physical separation or isolation of the microphone and speaker is important when operating the PA at high output levels 7 CHAPTER 3 OPERATION CONTROL FUNCTIONS FRONT PANEL 1 ON OFF VOLUME CONTROL Turn clockwise to apply power to the radio and to set the desired listening level 2 SQUELCH CONTROL This control is used to control or eliminate receiver b...

Page 5: ...matic Noise Limiter is activated In the NB ANL position the Noise Blanker is also activated The Noise Blanker is very effective in eliminating repetitive impulse noise such as ignition interference 13 PA CB RB SWITCH In the PA position your voice will come out of the speaker that you need to plug in to the PA SP jack on the back of the radio The radio does not operate when you are in the PA mode T...

Page 6: ...r is connected to this jack the built in speaker will be disabled 11 FREQUENCY CHART Channel Channel Frequency Channel Channel Frequency 1 26 965 MHz 21 27 215 MHz 2 26 975 MHz 22 27 225 MHz 3 26 985 MHz 23 27 255 MHz 4 27 005 MHz 24 27 235 MHz 5 27 015 MHz 25 27 245 MHz 6 27 025 MHz 26 27 265 MHz 7 27 035 MHz 27 27 275 MHz 8 27 055 MHz 28 27 285 MHz 9 27 065 MHz 29 27 295 MHz 10 27 075 MHz 30 27 ...

Page 7: ...r maximum receive gain C RF POWER CONTROL This feature allows for the adjustment of the RF power output continuously over the range of 1 to 4 watts in AM D PROCEDURE TO TRANSMIT 1 Select the desired channel of transmission 2 Set the MIC GAIN control fully clockwise 3 If the channel is clear depress the push to talk switch on the microphone and speak in a normal voice 13 ALTERNATE MICROPHONES AND I...

Page 8: ...cable before starting to solder If the washer is not captive to the pin receptacle body make sure that it is placed on the threaded portion of the pin receptacle body before soldering 7 If the microphone jack is used to hold the pin receptacle during soldering operation best results are obtained when the connections to pin 1 and 3 are made first and then the connections to pins 2 and 4 Use a minim...

Page 9: ... a conversation with another station for more than five minutes at a time without taking a one minute break to give others a chance to use the channel 2 You are not allowed to blast others off the air by over powering them with illegally amplified transmitter power or illegally high antennas 3 You can t use the transceiver to promote illegal activities 4 You are not allowed to use profanity 5 You ...

Page 10: ...out of gas on interstate 95 NO I am out of gas in my driveway YES There is a four car collision at Exit 10 on the Beltway send police and ambulance NO Traffic is moving smoothly on the Beltway YES Base to Unit 1 the Weather Bureau has just issued a thunder storm warning Bring the sailboat into port NO Attention all motorists The weather Bureau advises that the snow tomorrow will accumulate 4 to 6 ...

Page 11: ... RAN may be obtained from our website or by calling our Service Department at 760 480 8800 between 10 00 AM and 4 00 PM Pacific Time The RAN must be written below your return address on the outside of the shipping box Boxes which arrive without an RAN will be refused and the shipping company will return the unopened box to you Be sure to have a pen and paper ready along with the serial number of y...

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