Galaxy DX959 User Manual
Contents
1. This is a special noise filter that de emphasizes audio high frequency response in order to increase the signal to noise ratio of weak signals While you will notice a dramatic reduction in the rushing sound when this filter is activated it does not have much effect on the signal to noise ratio of strong signals MODE SWITCH This control allows you to select one of the following operating modes AM USB LSB TONE SWITCH HI MED LO This switch changes the tone quality In LO position bass is increased and in HI position treble is increased CHANNEL DISPLAY The channel display indicates the current selected channel 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 R B LED This lights green when the Roger Beep is on RX TX LED This LED is green during receive and red during transmit FREQUENCY COUNTER This display indicates the frequency of the selected channel REAR PANEL CONNECTOR This device complies with part 15 of the FCC Rules yE R ion is subject to the condition that this device N A S ise harmful interference MODEL NO DX 959 FCC ID M38 DX 959 AX 4 J AM SSB 40 CH alay Ss Lf CB TRANSCEIVER MADE IN MALAYSIA oareor ues sanno 70900001 1 ANTENNA This jack accepts 50 ohms coaxial cable with a PL 259 type plug 2 POWER This ac2. 20 Press the PTT push to talk switch and tap the antenna making it shorter The S W R meter will show a lower reading each time the antenna is tapped By continuing to shorten the antenna you will notice the S W R 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 When the lowest point has been reached switch to Channel 1 and then to Channel 40 and compare S W R readings They should be almost equal NOTE The proper setting is achieved when the SWR is 1 5 or below and when it has the same reading for channels 1 and 40 B Antennas which must be cut to proper length 1 Follow the same procedure as above but adjust the length by cutting in 1 8 increments until a good match is obtained 2 Be very careful not to cut too much at one time as once it is cut it can no longer be lengthened 3 The whip is easily cut by filing a notch all the way around and breaking the piece off with pliers If you re having difficulties in adjusting your antenna check the following a All doors must be closed when adjusting the antenna Make sure the antenna base is grounded c Check your coaxial cable routing it may be pinched when routed into the car d Try a different location in your car keeping in mind the radiation pattern you wish Is the antenna perfectly vertical f T
3. AM position only standard double sideband full carrier signals will be detected An SSB signal may be recognized while in the AM mode by its characteristic Donald Duck sound and the inability of the detector to produce an intelligible output The USB and LSB modes will detect upper sideband and lower sideband respectively and standard AM signals SSB reception differs from standard AM reception in that an SSB receiver does not require a carrier or opposite sideband to produce an intelligible signal A single sideband transmitted signal consists only of the upper or the lower sideband and no carrier is transmitted The elimination of the carrier from the AM signal helps to eliminate the biggest cause of whistles and tones heard on channels which make even moderately strong AM signals unreadable Also SSB takes only half the space of an AM channel therefore two SSB conversations will fit into each channel expanding the 40 AM channels to 80 SSB channels The reduction in channel space required also helps in the receiver because only half of the noise and interference can be received with 100 of the SSB signal An SSB signal may be received only when the listening receiver is functioning in the same mode In other words an upper sideband signal USB may be made intelligible only if the receiver is functioning in the USB position If a lower side band LSB signal is heard when the receiver is in the USB mode no amount of tuning will make th
4. PL 259 cable termination If the transceiver is not mounted on a metal surface it is necessary to run a separate ground wire from the unit to good metal electrical ground in the vehicle When installed in 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 For Sales Information Please Contact RoadTrucker Inc www RoadTrucker com 8312 Sidbury Rd Wilmington NC 28411 800 507 0482 910 686 4281 TUNING THE ANTENNA FOR OPTIMUM S W R Since there is such a wide variety of base and mobile antennas this section will strictly concern itself to the various types of mobile adjustable antennas Because the antenna length is directly related to the channel frequency it must be tuned to resonate optimally on all channels of the transceiver Channel 1 requires a longer antenna than Channel 40 because it is a lower frequency Due to the various methods of adjusting antennas for proper S W R we have chosen what we think is the optimum method A Antenna with adjustment screws set screws 1 Start with the antenna extended and tighten the set screw lightly enough so that the antenna can be lightly tapped with your finger for easy adjustment 2 Set your transceiver to Channel
5. conditions when signal level is adequate the background noise does not present a serious problem Also when extremely low level signals are being received the transceiver may be operated with vehicle engine turned off The unit requires very little current and therefore will not significantly discharge the vehicle battery Even though the transceiver has ANL and NB controls 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 as variations between vehicles require different solutions to reduce the noise ANTENNA A vertically polarized quarter wavelength whip antenna provides the most reliable operation and greatest range Shorter loaded type whip antennas are more attractive compact and adequate for applications where the maximum possible distance is not required Also loaded whips do not present the problems of height imposed by a full quarter wavelength whip Mobile whip antennas utilize the metal body of the vehicle as a ground plane When mounted at a corner of the vehicle they are slightly directional in the direction of the body of the vehicle For all practical purpose however the radiation pattern is nondirectional The slight directional characteristic will be observed only at extreme distances A standard antenna connector type SO 239 is provided on the transceiver for easy connection to a standard
6. schematic If the microphone to be used is provided with pre cut leads they must be revised as follows 1 Cut leads so that they extend 7 16 beyond the plastic insulating jacket of the microphone cable 2 All leads should be cut to the same length Strip the ends of each wire 1 8 and tin the exposed wire Before beginning the actual wiring read carefully the circuit and wiring information provided with the microphone you select Use the minimum heat required in soldering the connections Keep the exposed wire lengths to a minimum to avoid shorting when the microphone plug is reassembled KNURLED RING JUSING 6 Os O O Fig 2 Microphone plug wiring To wire the microphone cable to the plug provided proceed as follows 1 Remove the retaining screw 2 Unscrew the housing from the pin receptacle body 3 Loosen the two cable clamp retainer screws 4 Feed the microphone cable through the housing knurled ring and washer as shown Figure 2 5 The wires must now be soldered to the pins as indicated in the above wiring tables If a vise or clamping tool is available it should be used to hold the pin receptacle body during the soldering operation so that both hands are free to perform the soldering If a vise or clamping tool is not available the pin receptacle body can be held in a stationary position by inserting it into the microphone jack on the front panel The numbers of the microphone plug are shown in Fig 3
7. Printed In Malaysia ATO0949011A MIC980508 Galaxy DX 959 SOLID STATE CITIZENS BAND AM SSB MOBILE TRANSCEIVER OWNER S MANUAL TABLE OF CONTENTS Specifications 0 0 c eee eee eee Installation Location 2 ink ai veednaeetaniseey cohen eases Mounting The Radio 0 cee eee eee Ignition Noise Interference 4 Antenna co ska hat eee s eeehdecceeweeses canbe Tuning The Antenna For Optimum SWR External Speaker ok yuh ee sha eee ae aged Operation Control Functions 2 2s iascte dete anne eave a wae Front Panel 3 0466225 nena eens beens eect eans Rear Panel cctuwies tae daeeraglanntadeees Frequency Wa6t o225 2 ee4 exe heeaceereedeeees Procedure To Receive And Transmit Receiving SSB Signals 0 cece eens Alternate Microphones And Installation Maintenance And Adjustment A Few Rules That Should Be Obeyed How Your CB Can Serve You 0 Use Channel 9 For Emergency Messages Only Warranty eese hee a ce ta Bae ehe daw eR Nn fH HRW W 10 11 12 13 15 18 19 19 20 21 SPECIFICATIONS GENERAL Channels Frequency Range Emission Frequency Control Frequency Stability Temperature Range Input Voltage Antenna Impedance Speaker Impedance Size Weight TRANSMITTER RF Power Output Frequency Response Frequency Tolerance Spurious Emission Unwanted Sideband RECEIVE
8. R Sensitivity for 10 dB S N N Squelch Sensitivity Audio Power Output Image Rejection Ratio AGC Figure of Merit Audio Response Clarifier Range 40 26 965 27 405 MHz AM USB LSB Phase Lock loop PLL Synthesizer 0 001 30 C to 50 C 13 8 VDC 50 Ohms 8 Ohms 7 7 8 W x 9 1 4 D x 2 1 8 H 5 5 lbs AM 4W USB LSB 12W PEP 300 to 2500 Hz 0 005 Better Than 55 dB Better Than 55 dB AM 0 5uV_ USB LSB 0 25 uV Less Than 0 5 uV 2W 10 Distortion 65 dB 100 mV for 10dB Change in Audio Output 300 to 2500 Hz 1 0 KHz SPECIFICATIONS SUBJECT TO CHANGE WITHOUT NOTICE INSTALLATION LOCATION Plan the location of the transceiver and microphone bracket before starting the installation Select a location that is convenient for operation and does not interfere with the driver or passengers In automobiles the transceiver is usually mounted the dash panel with the microphone bracket beside it MOUNTING THE RADIO The transceiver is supplied with a universal mounting bracket When mounting the bracket and radio to your car make sure it is mechanically 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 des
9. as viewed from the back of the plug Before soldering the wire to the pins pre tin the wire receptacle of each pin of the plug Se wr Fig 3 Microphone plug pin numbers viewed from rear of pin receptacle Be sure that the housing and the knurled ring of Figure 2 are pushed back onto the microphone 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 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 minimum amount of soldering and be careful to prevent excessive solder accumulation on pins which could cause a short between the pin and the microphone plug housing When all soldering connections to the pins of the microphone are completed push the knurled ring and the housing forward and screw the housing onto the threaded portion of the pin receptacle body Note the location of the screw clearance hole in the plug housing with respect to the threaded hole in the pin receptacle body When the housing is completely threaded into the pin receptacle body a final fraction of a turn either clockwise or counterclockwise may be required to align the screw hole with the threaded hole in the pin receptacle body When these are aligned the retaining screw is the
10. cepts 13 8V DC power cable with built in fuse The power cord provided with the radio has a black and red wire The black goes to negative and red goes to positive 3 PA SP This jack is for PA operation Before operating you must first connect a PA speaker 8 ohms 4W to this jack 4 EXT SP This jack accepts 4 to 8 ohms 5 watts external speaker When the external speaker is connected to this jack the built in speaker will be disabled FREQUENCY RANGE Channel 1 O oo NU Dn A U N NO ee FE ES Ee Ei ee See ee S O uu DO Nn BPW NYO KF D Channel Frequency Channel 26 965 MHz 26 975 MHz 26 985 MHz 27 005 MHz 27 015 MHz 27 025 MHz 27 035 MHz 27 055 MHz 27 065 MHz 27 075 MHz 27 085 MHz 27 105 MHz 27 115 MHz 27 125 MHz 27 135 MHz 27 155 MHz 27 165 MHz 27 175 MHz 27 185 MHz 27 205 MHz 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 Channel Frequency 27 215 MHz 27 225 MHz 27 255 MHz 27 235 MHz 27 245 MHz 27 265 MHz 27 275 MHz 27 285 MHz 27 295 MHz 27 305 MHz 27 315 MHz 27 325 MHz 27 335 MHz 27 345 MHz 27 355 MHz 27 365 MHz 27 375 MHz 27 385 MHz 27 395 MHz 27 405 MHz PROCEDURE TO RECEIVE AND TRANSMIT A MICROPHONE The receiver and transmitter are controlled by the push to talk switch on the microphone Press the switch and the transmitter is activated release switch to receive When transmitting hold the microphone two inches from the mouth and sp
11. e signal intelligible The reason for this may be understood if you consider that when the modulation is applied to the transmitter s microphone in the USB mode the transmitter output frequency is increased whereas in the LSB mode the transmitter s output frequency is decreased The result in listening to the receiver is that when the MODE switch is in the proper position either USB or LSB a true reproduction of a single tone of modulation will result and if the tone is increased in frequency such as a low pitched whistle or a high pitched whistle you will hear the increase in the output tone of the receiver If the incorrect mode is selected an increase in tone of a whistle applied to the transmitter will cause a decrease in the resultant tone from the receiver Thus when a voice is used in place of a whistle or tone in the proper listening mode the voice will be received correctly whereas in the incorrect mode the voice will be translated backwards and cannot be made intelligible by the CLARIFIER control When listening to an AM transmission a correct sideband is heard in either mode since both upper and lower sidebands are received Once the desired SSB mode has been selected frequency adjustment may be necessary in order to make the incoming signal intelligible The CLARIFIER control allows the operator to vary frequency above or below the exact frequency of the channel If the sound of the incoming signal is high or low pitched ad
12. eak clearly in a normal voice This transceiver comes complete with a low impedance dynamic microphone B l 6 Te C PROCEDURE TO RECEIVE Be sure that power source microphone and antenna are connected to the proper connectors before going to the next step Turn unit on by running VOL knob clockwise on transceiver Set the VOL for a comfortable listening level Set the MODE switch to the desired mode Listen to the background noise from the speaker Turn the SQ knob slowly clockwise until the noise just disappears Leave the control at this setting This SQ is now properly adjusted The receiver will remain quiet until a signal is actually received Do not advance the control too far or some of weaker signals will not be heard Set the CHANNEL selector switch to the desired channel Set the RF GAIN control fully clockwise for maximum receive gain 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 and 4 to 12 watts in USB or LSB D 1 2 PROCEDURE TO TRANSMIT Select the desired channel of transmission Set the MIC GAIN control fully clockwise If the channel is clear depress the push to talk switch on the microphone and speak in a normal voice RECEIVING SSB SIGNALS There are three types of signals presently used for communications in the Citizens Band AM USB LSB When the MODE switch on your unit is placed in the
13. eather Bureau has just issued a thunder storm warning Bring the sailboat into port Attention all motorists The weather Bureau advises that the snow tomorrow will accumulate 4 to 6 inches There is a fire in the building on the corner of 6th and Main Streets This is Halloween patrol unit number 3 Everything is quiet here WARRANTY This radio is covered by a two year limited parts and labor warranty Limited means that we will repair problems caused by factory defects or normal use at no charge Before returning a radio to us for warranty service please call our Service Department for a Repair Authorization Number RAN This RAN must be written below your return address on the outside of the shipping box Boxes which arrive without a 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 your radio before calling We will give you the RAN and our shipping address over the phone The telephone number of the Service Department is 760 480 8800 and we suggest calling between 10 00 AM and 4 00 PM Pacific Time Please include a note with a detailed description of the symptoms This is important because it will help the technician who works on your radio to locate your problem Intermittent problems are easily overlooked so be sure to give as much detail as possible in your note Also please include y
14. ired position remove the mounting bolts Before drilling the holes make sure nothing will interfere with the installation of the mounting bolts 2 Connect the antenna cable plug to the standard receptacle on the rear panel Most transceiver antennas are terminated with a type PL 259 plug and mate with the ANT receptacle 3 Connect the red DC power input wire with the fuse to 13 8V DC This wire extends from the rear panel In automobile installation 13 8V DC is usually obtained from the accessory contact on the ignition switch This prevent the set being left on accidentally when the driver leaves the car and also permits operating the unit without the engine running Locate the accessory contact on most ignition switches by tracing the power wire from the AM broadcast receiver in the car 4 Connect the black lead to 13 8V DC This is usually the chassis of the car Any convenient location with good electrical contact remove paint may be used 5 Mount the microphone bracket on the right side of the transceiver or near the transceiver using two screws supplied When mounting in an automobile place the bracket under the dash so that microphone is readily accessible IGNITION NOISE INTERFERENCE 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 installation is from the generator and ignition system in the vehicle Under most operating
15. just the operation of the CLARIFIER Consider it as performing the same function as a phonograph speed control When the speed is set too high voices will be high pitched and if set too low voice will be low pitched Also there is only one correct speed that will make a particular record produce the same sound that was recorded If the record is played on a turntable that is rotated in the wrong direction opposite sideband no amount of speed control CLARIFIER will produce an intelligible sound An AM signal received while listening in one of the SSB modes will produce a steady tone carrier in addition to the intelligence unless the SSB receiver is tuned to exactly the same frequency by the CLARIFIER control For simplicity it is recommended that the AM modes be used to listen to AM signals ALTERNATE MICROPHONES AND INSTALLATION For best results the user should select a low impedance dynamic type microphone or a transistorized microphone Transistorized type microphones have low output impedance characteristics The microphones must be provided with a four lead cable The audio conductor and its shielded lead comprise two of the leads The third lead is for transmit control and fourth is for receiving control The microphone should provide the functions shown in schematic below 4 WIRE MIC CABLE Pin Number Mic Cable Lead 1 Audio Shield 2 Audio Lead 3 Transmit Control 4 Receive Control Fig 1 Your transceiver microphone
16. n screwed into place to secure the housing to the pin receptacle body The two cable clamp retainer screws should now be tightened to secure the housing to the microphone cord If the cutting directions have been carefully followed the cable clamp should secure to the insulation jacket of the microphone cable 8 Upon completion of the microphone plug wiring connect and secure the microphone plug in the transceiver MAINTENANCE AND ADJUSTMENT This transceiver is specifically designed for the environment encountered in mobile installations The use of all solid state circuitry and its light weight result in high reliability Should a failure occur however replace parts only with identical parts Do not substitute NOTE If the performance described in the OPERATION and MAINTENANCE AND ADJUSTMENT sections is not obtained review the operating instructions to insure that proper procedures were followed FCC WARNING All transmitter adjustments other than those provided on front panel by the manufacturer must be made by or under the supervision of the holder of an FCC issued general radio telephone operator s license A FEW RULES THAT SHOULD BE OBEYED 1 You are not allowed to carry on 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 illegall
17. our telephone number in case our technicians have any additional questions Do not send your bracket power cord or microphone unless we ask for these items during our telephone conversation You are responsible for getting the radio safely to us We suggest using United Parcel Service You must pay to ship the radio to us and we will pay to ship the radio back to you Since we use UPS and they do not ship to Post Offices boxes please provide us with a street address for the return of your radio We will repair and return your radio as soon as we can We appreciate your choosing a Galaxy radio and we want you to be on the air as much as possible Be sure to visit our web site at www GalaxyRadios com
18. rd at mare eekwase seting on the meter indicates your percentage of modulation This operates in Lk AM only not in SSB When thi itch is in PWR position th t MIC GAIN R B Adjusts the microphone gain in the transmit and PA eect S EE a a i f indicates your power output modes This controls the gain to the extent that full talk power is ae oe away fr mi the microphone Iri the PUBLIC 12 NB ANL OFF SWITCH In the ANL position the Automatic Noise ADDRESS PA mode the control functions as the volume control Pushing this knob turns the Roger Beep on and off 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 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 14 15 16 17 18 19 20 PA GNF CB 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 GNF mode you are in CB operation but the Galaxy Noise Filter GNF is engaged
19. ry a different location in your neighborhood Stay away from large metal objects when adjusting metal telephone or lamp post fences etc o NOTE The transceiver will operate into an SWR of 2 to 1 indefinitely and sustain an SWR of 20 1 for a maximum of 5 minutes at rated operating conditions EXTERNAL SPEAKER The external speaker jack EXT SP on the rear panel is used for remote receiver monitoring The external speaker should have 8 ohms impedance and be able to handle at least 4 watts When the external speaker is plugged in the internal speaker is disconnected PUBLIC ADDRESS To use the transceiver as a public address system connect an external 8 ohms speaker 4 watts minimum to the PA SP jack located on the rear panel Direct speaker away 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 OPERATION 4 RF GAIN CONTROL This control is used to reduce the gain of the CONTROL FUNCTIONS receive amplifier under strong signal conditions FRONT PANEL 5 DIMMER CONTROL This knob controls the level of brightness for the meter lamp the frequency display 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 tran
20. smit 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 ON OFF VOLUME CONTROL Tum clockwise to apply power to Teatre W cone Cees titma lbg aet erea sienna eyel 10 CLARIFIER Allows tuning of the receive frequency above or below f E the channel frequency by up to 1 0 KHz Although this control is SQUELCH CONTROL This control is used to control or eliminate intended primarily to tune in SSB signals it may be used to optimize receiver background noise in the absence of an incoming signal For See i AM signals maximum receiver sensitivity it is desired that the control be adjusted i nda i eli erica aac er ga aa EC 11 SWR MOD PWR SWITCH This switch controls the function of the di y Siig ian Pr m gt waa ADE p ra PODS po meter during the transmit mode In the SWR position the meter A a ny i to Ta ar now 96 SBN SaR E indicates the Standing Wave Ratio SWR of your antenna There are no n Td T mers es ve ae eee is ee adjustments because the SWR circuit in this radio calibrates itself see a ne a i Ep must ae ene i Dane automatically When the switch is in the MOD position the green scale SirODE SEAS WES De hea
21. y 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 may not play music in your transceiver 6 You may not use your transceiver to sell merchandised or professional service HOW YOUR CB CAN SERVE YOU 1 Warn of traffic tie ups ahead 2 Provide weather and road information 3 Provide help fast in event of emergency or breakdown 4 Suggest good spots to eat and sleep 5 Make long trips more interesting and help keep you awake 6 Provide direct contact with your office or home 7 Make friends for you as you travel 8 Provide local information to find your destination 9 Help law enforcement officers by reporting drunk and reckless drivers USE CH 9 FOR EMERGENCY MESSAGES ONLY The FCC gives the following examples of permitted and prohibited types of communications for use in intended to be all inclusive Permitted YES NO YES NO YES NO YES NO YES NO an emergency These are guidelines and are not Example Message A tornado sighted six miles north of town This is observation post number 10 No tornado sighted I am out of gas on interstate 95 I am out of gas in my driveway There is a four car collision at Exit 10 on the Beltway send police and ambulance Traffic is moving smoothly on the Beltway Base to Unit 1 the W
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