Galaxy DX 2547
Contents
1. 2547 8 TALKBACK ax Lt GNF PA USB AM LSB i CHANNEL NL NB AM S SWR ALERT PHONES ise CLARIFIER AM SSB Two Way Citizen Band Base Station Transceiver Printed In Malaysia OWNER S MANUAL AT2547010A PD0009028 NORMAL 19 SQUELCH yoy VOLUME 1 TABLE OF CONTENTS CHAPTER 1 SPECIFICATIONS PAGE GENERAL CHAPTER 1 Channels 40 Specifications 2 Frequency Range 26 965 27 405 MHz Emission AM USB LSB Frequency Control Phase Lock loop PLL Synthesizer CHAPTER 2 Frequency Tolerance 0 005 anstallaion E EE maton 3 Frequency Stability 0 003 LOC atone nh BG Oe 3 Temperature Range 30 C to 50 C Ignition Noise Interference 3 Antenna Impedance 50 Ohms Antenna E lia oat 3 Antenna Connectors Standard 239 type External Sp aker dh aoa eed h 5 Meter Eunction Meter 1 RF output Power Antenna SWR Phone Jack eh vee eb kb aed hed eina 5 Meter 2 Received signal strength Public Address 5 Input Voltage AC 120V 60Hz CHAPTER 3 TRANSMITTER 22 cds Srey 99 eRe 6 RE Power Output 4W USB LSB 12W2. Control Function ases eee wees de alates ee 6 Antenna Connector UHF Type 50 Ohms Fiont Panel eis eee E OaS 6 AM Modulation Up to 100 Rear Panel eraa oe ae S 10 Spurious Emission Better than 60 dB Frequency Chart 11 Unwanted Sideband Better than 60 dB Procedure to Receive And Transmit 12 Receiving SSB Signals 13 RECEIVER Alternate Microphone And Installation 15 Sensitivity for 10 dB 5 0 5 uV USB LSB 0 15 uV Maintenance and Adjustment 18 Adjacent Channel Rejection 60dB A Few Rules That Should Be Obeyed 19 Image Rejection 504 How Your can Serve You 19 AGC Figure of Merit 50 mV for 10dB Change in Audio Output Use Channel 9 for Emergency Message Only 20 Audio Power Output 2 5W 10 Distortion Warranty 525 5 Segue ob ele AG cone 21 Audio Response 300 to 2500 Hz CHAPTER 2 INSTALLATION LOCATION Choose a location close to an AC power outlet and convenient for running the antenna lead in cable This transceiver is attached with the AC power cord set Proceed as follows to complete all necessary connections to the transceiver 1 Your transceiver has a standard antenna connector type SO 239 located on the rear panel for easy connection to the stand
3. Connect to AC power outlet for ac main supply 2 FUSE Accommodates a fuse for AC input circuit protection Use 125V 2A fuse for replacement 3 DC POWER This accepts 13 8V DC power cable with built in 7A fuse The power cord provided with the radio has a black and red wire The black goes to negative and red goes to positive 4 AC DC POWER SELECTOR This control is used to select a desired power supply of AC power or DC power 5 ANTENNA This jack accepts 50 ohms coaxial cable with a PL 259 type plug 6 PA SP This jack is for PA operation Before operating you must first connect a PA speaker 8 ohms 4W to this jack 7 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 10 FREQUENCY CHART Channel 1 ON Nn FP 99 WN FOF BW KF 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 11 21 22 23 24 25 26 21 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 2
4. K k isp CLARIFIER VOLUME eke yoy 5 A 1 PHONE JACK Used to connect headphones for listening 2 MICROPHONE JACK Used to connect microphone for voice source 3 RF POWER CONTROL This control allows the user to adjust RF power output 4 RF GAIN CONTROL This control is used to reduce the gain of the RF amplifier under strong signal conditions 5 MIC GAIN CONTROL Adjust the microphone gain in the transmit and PA modes This controls the gain to the extent that full talk power is available several inches away from the microphone In the Public Address PA mode the control function as the volume control 6 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 It is most accurate when testing at 4 watts output This operates in AM only not in SSB When this switch is in PWR position the meter indicates your power output 7 DIMMER CONTROL This knob controls the level of brightness for the meter lamp and channel display 8 TONE CONTROL This control changes tone quality in receive only In clockwise rotation
5. supervision of the holder of an FCC issued general radio telephone operator s license 18 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 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 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 Provide local information to find your destination 9 Help law enforcement officers by reporting drunk and reckless drivers 19 USE CHANNEL 9 FOR EMERGENCY MESSAGES ONLY The FCC gives the following examples of permitted and prohibited types of communications for use in an emergency These are guidelines and are not intended to be all inclusive Permitted Example Mes
6. treble is increased and in counter clockwise rotation bass is increased 9 PA OFF 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 10 ROGER BEEP SWITCH In the Roger Beep position the radio transmits an audio tone at the end of your transmission to indicates that transmission has ended As a courtesy to others use the Roger Beep only when necessary 11 CHANNEL SELECTOR This control is used to select a desired transmit and receive channel 12 ANL OFF SWITCH In the ANL position the Automatic Noise Limiter is activated 13 MODE SWITCH This control allows you to select one of the following operating modes USB AM LSB 14 GNF OFF SWITCH In the GNF mode you are in CB operation but the Galaxy Noise Filter is engaged 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 of strong signals 15 CLARIFIER OFF SWITCH Pushing this switch turns the Clarifier on and off 16 CLARIFIER CONTROL Allows tuning of the receive frequency above or below the channel frequency by up to 1 0KHz Although this control is int
7. 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 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 Fig 3 Microphone plug pin numbers viewed from rear of pin receptacle 6 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 7 If the microphone jack is used to hold the pin receptacle during soldering 8 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
8. 7 315 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 speak clearly in a normal voice This transceiver comes complete with a low impedance dynamic microphone B PROCEDURE TO RECEIVE 1 Be sure that power source microphone and antenna are connected to the proper connectors before going to the next step 2 Press the POWER switch to apply power to the radio 3 Set the VOL for a comfortable listening level 4 Set the MODE switch to the desired mode 5 Listen to the background noise from the speaker Turn the SQ knob slowly clockwise until the noise just disappears The 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 6 Set the CHANNEL selector switch to the desired channel 7 Set the RF GAIN control fully clockwise for maximum RF 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 and 4 to 12 watts in USB or LSB D PROCEDURE TO TRANSMIT 1 Select the desired channel of tran
9. 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 then screwed into place to secure the housing to the pin receptacle body 17 9 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 10 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 base 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 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
10. ard PL 259 coax plugs If the coax antenna cable must be made longer use only enough coax cable to suit your needs with impedance of 50 ohms frequency range from 26 965 to 27 405 MHz This will insure proper impedance match and maximum power transfer from the transmitter to the antenna 2 Use 120V AC power for the base station NOISE INTERFERENCE There are several kinds of noise interference you may encounter in base station operation Some of these noises come from fluorescent light electrical appliance lawnmower nearby commercial broadcast etc Commercial products are available to reduce interference from these sources Consult your dealer or professional amateur radio supplier Even though the transceiver has ANL and NB controls in some installation 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 For best transmission and reception your transceiver should use an antenna especially designed for a frequency of 27 MHz Antenna is to be purchased separately and it comes with the installation instructions Numerous types of antennas are available Some emphasize on ease of installation while others emphasize on performance Often the difference in performance for these antennas is modest 1 Vertical Ground Plane Antenna Omni directional an
11. either mode since both upper and lower side bands 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 adjust 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 side band 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 14 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 provided with a four
12. ended primarily to tune in SSB signals it may be used to optimize AM signals 17 CLARIFIER LED This LED lights when the clarifier is on 18 NB OFF SWITCH In the NB position the Noise Blanker is activated The Noise Blanker is very effective in eliminating repetitive impulse noise such as ignition interference 19 VOLUME CONTROL Turn clockwise to set the desired listening level 20 SQUELCH CONTROL This switch is used to eliminate background noise being heard through the receiver which can be disturbing when no transmission are being heard through the received To use this feature turn the switch fully counterclockwise and then turn clockwise slowly until the background noise is just eliminated Further clockwise rotation will increase the threshold level which a signal must overcome in order to be heard Only strong signal will be heard at a maximum clockwise setting 21 TALKBACK CONTROL Turn clockwise to activate Talkback circuit 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 22 POWER ON OFF CONTROL Pushing this switch to apply power to the unit 23 FRONT PANEL METER The Front Panel Meter allows the user to monitor signal strength RF output power SWR level and AM Modulation level 24 TX RX LED The red LED indicates the unit is in the transmit mode The green LED indicates the unit is i
13. ervice 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 your telephone number in case our technicians have any additional questions Do not send your 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 21
14. lead cable The audio conductor and its shielded lead comprise two of the leads The third lead is for transmit control and the 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 schematic If the microphone to be used is provided with precut 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 15 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 NURLED RING USING Os 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 16 5 The wires must now be soldered to the pins as indicated in the above wiring tables If
15. n the receive mode 25 CHANNEL DISPLAY The channel display indicates the current selected channel 26 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 27 28 29 30 31 32 33 34 35 36 GNF LED This LED lights red when the GNF is on R B LED This LED lights green when the Roger Beep is on FREQUENCY COUNTER This display indicates the frequency of the selected channel PA LED This LED lights red when the radio is in the mode ANL LED This LED lights red when the ANL is on USB LED This LED lights red when the radio is in the USB mode AM LED This LED lights red when the radio is in the AM mode NB LED This LED lights red when the NB is on LSB LED This LED lights red when the radio is in the LSB mode CH9 CH19 SWITCH This control allows you to select CH 9 or CH19 instantly When the switch is placed in the NORMAL position the user is allow to select a desired transmit and receive channel REAR PANEL 2 0 FCC ID C2R DX 2547 TO PREVENT FIRE OR ELECTRIC SHOCK kd iora TRANGGEWER DO NOT EXPOSE THIS APPLIANCE TO mses INPUT 120VAC 50 60Hz 60W RAIN MOISTURE SERIAL NO IN TAIWAN 125V 2A GE PA EXTSP DC 13 8V k E j INPUT ac NW iy ESS I 1 AC POWER CORD
16. 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 side band 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 the 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 2132 Thus when 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 side band is heard in
17. sage YES A tornado sighted six miles north of town NO This is observation post number 10 No tornado sighted YES I am out of gas on interstate 95 NO I am out of gas in my driveway YES There is a four car collusion 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 inches YES There is a fire in the building on the corner of 6th and Main Streets NO This is Halloween patrol unit number 3 Everything is quiet here 20 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 S
18. smission 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 12 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 AM position only standard double side band 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 side band and lower side band respectively and standard AM signals SSB reception differs from standard AM reception in that an SSB receiver does not require a carrier or opposite side band to produce an intelligible signal A single side band transmitted signal consists only of the upper or the lower side band 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
19. tennas provide optimum performance for contacting other fixed stations using vertical type antennas in addition to all mobile stations For medium long range communications work Ground Plane 2 Directional Beam Antenna Highly efficient and directional antenna generally intended for fixed to fixed long range communications Directional Beam Antenna 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 PHONE JACK This PHONE jack accepts headphone of 4 to 32 ohms impedance When a headphone is plugged into this jack both internal and external speakers are silenced simultaneously 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 CHAPTER 3 OPERATION CONTROL FUNCTIONS FRONT PANEL POWER gt A NORMAL 9 4 2 zay 6 CHANNEL ANL TALKBACK F RX TX SWR ALERT SQUELCH yA ANL NB PHONES Fe Coen
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