DX 45MP manual - Galaxy Radios
Contents
1. 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 Printed in China AT094901002. improve reception If the ignition noise level is too high to allow proper operation under most conditions you should have your installation of the radio checked by a qualified technician ANTENNA This radio has a jack in the rear for a standard PL 259 antenna plug If you are looking for the most range for your transmission use a vertically polarized quarter wave length antenna If antenna height is a problem you may use a shorter loaded type whip antenna although you can expect some loss of transmission range To improve performance your antenna should be matched to your radio Your antenna can be adjusted so that it matches your radio 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 Public Address PA function first connect an external speaker to the PA SP Jack on the rear of the radio See the above specifications for a proper external speaker Keep the speaker away from the microphone to avoid acoustic feedback CHAPTER 3 OPERATION CONTROL FUNCTIONS FRONT PANEL 40 41002003 44 05 16 17 18 19 20 21 92 10KHz NBANL MOD M NBANL MED PA OFF DM BRIGHT VOLS MU GAN RFGAN ECHOSTME 1 MICROPHONE JACK Used
3. to the positive terminal on the vehicle s battery and the black lead be connected to the nearest chassis ground Note This radio is designed for vehicles with negative ground systems Connections should be made using appropriate crimp on lugs of a size large enough to make good contact with the bolt used to fasten to the battery and the chassis ground It is a good safety idea to install a second fuse that would provide protection in case the red wire was to fray or get pinched and short to the body of the vehicle somewhere between the battery and the radio High power radios such as this one require large DC current flow when in the TX mode Poor power connections cause supply voltage drops that can substantially decrease the performance of your radio A good DC connection is probably one of the most important things for getting the best transmitter performance and in some cases least receiver noise Mount the microphone bracket near the radio in an easily accessible spot using the two screws provided IGNITION NOISE INTERFERENCE With weak signals you may experience interference of the signal by background noise This radio has NB and ANL circuits which will help reduce background noise from sources such as your ignition system However background electrical noise may come from several sources and all noise may not be eliminated With extremely weak signals you can operate this radio with the engine turned off which should
4. 8 315 28 755 MHz AM FM Phase Lock Loop PLL Synthesizer 0 001 30 C to 50 C 50 Ohms Standard SO 239 type 13 8V DC 7 7 8 W x 2 3 8 H x 10 1 4 D 5 0 Ib AM FM 10W 50 dB 1096 300 to 2500 Hz Dynamic AM 0 5uV FM 025uV 0 5uV 55 dB 50 dB 40 dB 100 mV for 10dB Change in Audio Output 2 5W 10 Distortion 300 to 2500 Hz SPECIFICATIONS SUBJECT TO CHANGE WITHOUT NOTICE CHAPTER 2 INSTALLATION INSTALLING THE RADIO Choose a convenient location for operation that does not interfere with driver or passenger This radio 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 vehicle Proceed as follows to install the radio i Locate a convenient area in your vehicle for the installation of the radio Hold the mounting bracket with the radio in the location where the radio is to be installed Make sure nothing will interfere with either the radio or the mounting bolts Mark and then drill holes for the mounting bracket Most radio antennas come equipped with a PL 259 plug Connect this plug to the ANT Jack in the rear of the radio Extending from the rear of the radio is a fused red and black wire for the DC connections to the vehicle s electrical system For best performance it is strongly recommended that the red lead be taken directly
5. Gal kk TABLE OF CONTENTS alaxy CHAPTER 1 Specifications 2 0 0 0 0 ccc cece hh hm 2 DX 45MP Installation soie Rm ERE RO dana a ea E C Ad Installing The Radio 1 keene eee ee Ignition Noise Interference 0 cece eee eee eee 10KHz AM BR AM NBANT BREET ECHO OO C NBANL MED PWR B OFF DM OFF External Speaker 1 2 cese eek eee cheek bere lace eckd Public Address eese eee RR ahh an ha hr E B gt A A A A oU WwW VOL S MI GAN RFGAN ECHOSTME CHAPTER 3 Op ration sisse ER Reb ReeI RR E Rer ne DX 45MP BrontPabel sisterno dub duoc E a irapa ated apes Rear Panel 2 4 eb reae tei rebote epe dade vus Procedure to Receive and Transmit lllllislslesessn 1 0 Meter 7 Alternate Microphone and Installation 004 10 Amateur Mobile Transceiver With StarLite Face Plate NO O00 th tA OWNER S MANUAL CHAPTER 1 SPECIFICATIONS GENERAL Model Frequency Range Emission Frequency Control Frequency Stability Temperature Range Antenna Impedance Antenna Connectors Input Voltage Size Weight TRANSMITTER RF Power Output Spurious Emission Audio Distortion Frequency Response Microphone RECEIVER Sensitivity for 10 dB S N N Sensitivity for 12 dB S N N Squelch Sensitivity Selectivity Image Rejection Hum amp Noise AGC Figure of Merit Audio Power Output Audio Response DX 45MP 2
6. ct one of the following operating modes AM FM PA 17 18 19 20 21 22 10KHz NB ANL NB ANL OFF SWITCH When in the upper position transmit and receive frequency is shifted up 10KHz and the Noise Blanker NB and Automatic Noise Limiter ANL circuits are activated too When the switch is in the middle position the Noise Blanker NB and Automatic Noise Limiter ANL circuits are activated but the 10KHz circuit is not activated When in the lower position none of these circuits are active The Noise Blanker is very effective in eliminating repetitive impulse noise such as ignition interference BRIGHT MED DIM SWITCH This switch controls the level of brightness for the meter lamp faceplate and channel display ECHO OFF SWITCH This switch is used to turn on the Echo circuit 10KHz LED This LED lights green when the 10KHz function is on CHANNEL DISPLAY The channel display indicates the current selected channel RX TX LED The red LED indicates the unit is in the transmit mode The green LED indicates the unit is in the receive mode REAR PANEL ANTENNA This jack accepts a 50 ohm coaxial cable with a PL 259 type plug DC POWER This jack accepts the 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 PA SP This jack is for PA operation Before operating you mu
7. e 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 11 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 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 he S dis VAS 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 mini
8. ear depress the push to talk switch on the microphone and speak in a normal voice 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 the 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 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 10 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 HOUSING O Or O O Fig 2 Microphone plug wiring To wire the microphone cable to th
9. mum 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 ofa 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 12 10 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 Upon completion of the microphone plug wiring connect and secure the microphone plug in the transceiver 13 MEMO 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 Befo
10. re 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 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 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 your daytime 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
11. st first connect a PA speaker 8 ohms 4W to this jack EXT SP This jack accepts a 4 to 8 ohm 5 watt external speaker When the external speaker is connected to this jack the built in speaker will be disabled PROCEDURE TO RECEIVE AND TRANSMIT A MICROPHONE The push to talk switch on the microphone controls the receiver and transmitter Press the switch and the transmitter is activated release switch to receive When transmitting hold the microphone two inches from your 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 Turn VOL knob clockwise to apply power to the radio 3 Setthe VOL for a comfortable listening level 4 Setthe 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 the weaker signals will not be heard 6 Setthe CHANNEL selector switch to the desired channel 7 Setthe RF GAIN control fully clockwise for maximum RF gain C PROCEDURE TO TRANSMIT 1 Select the desired channel of operation 2 Setthe MIC GAIN control fully clockwise 3 Ifthe channel is cl
12. to connect microphone for voice source 2 ON OFF VOLUME CONTROL This knob controls the volume and power to the radio To turn radio on rotate the knob clockwise Turning the knob further will increase the volume of the receiver 3 SQUELCH CONTROL This knob is used to eliminate background noise being heard through the receiver which can be disturbing when no transmissions are being heard through the receiver To use this feature turn the knob 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 signals will be heard at a maximum clockwise setting 4 MIC GAIN CONTROL Adjusts the microphone gain in 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 functions as the volume control 10 11 12 13 14 15 16 RF GAIN CONTROL This control is used to reduce the gain of the RF amplifier under strong signal conditions ECHO CONTROL This control is used to adjust echo effect TIME CONTROL This control is used to adjust intervals of echo CHANNEL SELECTOR This control is used to select the desired transmit and receive channel SWR LED This LED lights red when your SWR is higher than about 3 1 This is not an exact indica
13. tor of 3 1 SWR but it is an indication that you should check your SWR reading FRONT PANEL METER The front panel meter allows the user to monitor signal strength RF output power SWR level and AM modulation level ILLUMINATED FACE PLATE All faceplate lettering will fully illuminate to allow the user easy viewing at night This unique solid state backlight is designed to maximize night vision while minimizing eye fatigue Therefore it is ideal for switch and control recognition day or night TALKBACK TB 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 RF POWER CONTROL This control allows the user to adjust RF power output BAND SELECTOR This switch is used to select the band 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 in the AM mode only It is most accurate when testing at maximum power output When this switch is in PWR position the meter indicates your power output MODE SWITCH This control allows you to sele
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