DX 77HML manual
Contents
1. Front Panel eoori ciel eee eo eee tae 6 Meter Illuminated indicates relative output power received signal strength Rear Panel 4 25 32234 cok eee ed ed eae 9 TRANSMITTER Operating Procedure to Receive 10 Power output AM FM Hight 7w Mid 4w Low 1w SSB 25 watts PEP Operating Procedure to Transmit 10 Modulation High and low level Class B Amplitude Modulation AM Variable capacitance Receiving SSB Signals 2 000000 11 Frequency Modulation FM Intermodulation SSB 34 order more than 25dB Roger Beep 0 0 eee ee eee eens 12 Distortion 5 order more than 35dB SSB Carrier Suppression 55dB Alternate Microphones and Installation 13 Unwanted Sideband 50dB Frequency Response AM and FM 450 to 2500 Hz Output Impedance 50 ohms unbalanced Output Indicators Meter shows relative RF output power and SWR Transmit LED glows red when transmitter is in operation RECEIVER Sensitivity Selectivity Image Rejection IF Frequency Adjacent Channel Rejection Automatic Gain Control AGC Squelch ANL Noise Blanker Clarifier Range Audio Output Power Frequency Response Built in Speaker External Speaker Not Supplied SSB 0 25 V for 10 dB S N N at greater than 2 watt of audio output AM 0 5 V for 10 dB S N N at greater than 2 watt of audio output FM 1 0 V for 20 dB S N N at greater than 2 watt of audio output AM FM 6 dB 3KHz 50 dB 9KH2. the retaining screw is then screwed into the 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 insulating jacket of the microphone cable Upon completion of the microphone plug wiring connect and secure the microphone plug in the transceiver 15 MEMO 16 MEMO MEMO 17 18
3. Audio Lead 3 Transmit control 4 Receive Control Fig 3 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 Before beginning the actual wiring read carefully the circuit and wiring information provided with the microphone you select Use the minimum head required in soldering the connections Keep the exposed wire lengths to a minimum to avoid shorting when the microphone plug is reassembled 13 pe We a KNURLED RING HOUSING o Fig 4 Microphone plug wiring Remove the retaining screw Unscrew the housing from the pin receptacle body Loosen the two cable clamp retainer screws Feed the microphone cable through the housing knurled ring and washer as shown Fig 4 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 of the front panel The numbers of the pins of the microphone pl
4. slightly stronger than the average received noise 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 3 MIC GAIN CONTROL inner dual concentric Adjusts 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 10 11 12 13 14 RF GAIN CONTROL outer dual concentric Use to reduce the gain of the RF amplifier under strong signal conditions ECHO inner dual concentric This control is used to echo effect TONE outer dual concentric This control is used to intervals of echo sound BAND SELECTOR This switch selects A B C D E or F of band of operation MODE PA FM AM USB LSB This switch is used to select PA FM AAM LSB or USB mode of operation Unless the station with which communication is desired is equipped with SSB the AM or FM mode is normally used The mode selector switch changes the mode of operation of both transmitter and receiver simultaneously Turn to Receiving SSB signals for a further explanation of single sideband CLARIFIER Allows variation of the receiver operating frequencies above and below the assigned frequency Although this control is intended primarily to tune in SSB signals it may be used to optimize AM FM signals as described in the Operating P
5. 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 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 bac
6. g bolts Connect the antenna cable plug to the standard receptacle on the rear panel Most antennas are terminated with a type PL 259 plug and mate with the receptacle 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 prevents 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 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 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 the 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 installations is from the generator and ignition system in the vehicle Under most operating 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 t
7. he same sound that was recorded If the record is played on a turntable that 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 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 ROGER BEEP When your transceiver is on normal operation your radio automatically transmits the audio sign at the end of your transmission The listener can note easily that your transmission is over through the sign Please note that this ROGER BEEP transmits 0 15 second at the moment PRESS TO TALK SWITCH KNOB is off ine ZEEN at vhe n L i S s K Fig 2 2132 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 a low output impedance characteristic The microphones must be provided with a four lead cable The audio conductor and its shielded lead comprise two of the leads The fourth lead is for receiving control and the third is for transmitting control The microphone should provide the functions shown in schematic below 4 WIRE MIC CABLE Pin Number Mic Cable Lead 1 Audio shield 2
8. k 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 Printed In Malaysia AT3602014G PD000907 kkx xx xx alaxy DX 77HML Full Channels with 10KHz AM FM USB LSB PA Mobile Transceiver with Roger Beep OWNER S MANUAL TABLE OF CONTENTS Specifications Page SpelhiCatiOno 5c 4 wsnicesskevioe sd os bene oe Moet 2 GENERAL Frequency Range 28 065 to 28 505 MHz Installation Frequency Control Phase Lock Loop PLL synthesizer Frequency Tolerance 0 005 TOCatOnN 7 ive hed tsi ote es cae ted 4 Frequency Stability 0 001 Operating Temperature 30 C to 55 C Mounting the Connection 005 4 Range Microphone Plug in dynamic with push to talk Ignition Noise Interference 004 5 switch and coiled cord Input Voltage 13 8V DC nominal 15 9V max 11 7V Antennas atie ae aay Oe 5 min positive or negative ground Transmit AM full mod 4A External Speaker 0 0 0 0 00 cece eens 5 SSB 21 watts PEP output 6A Receiver Squelched 0 6A Operation Maximum audio output 1 2A Size 2 3 8 H x 7 7 8 W x 9 1 4 D Control Functions 00000 cece eee eee 6 Weight 5 Ibs Antenna Connector UHF SO239
9. ower sideband respectively and standard AM signals SSB reception differs from standard AM reception in that 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 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 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 signals USB may be made intelligible only if the receive is functioning in the USB position If a lower sideband 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 modulation is applied to the transmitter s microphone in the USB mode the transmitter s output frequency is increased whereas in the USB mode the transmitter s output frequency is decreased The result in listening to the receive
10. r is that when the mode switch is in the proper position either USB or LSB a true reproduction of single tone of modulation will result and if the tone is increased in frequency such as a low pitched whistle 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 voice lock control When listening to an AM transmission a correct sideband is heard in either mode since both upper and lower sidebands are received efi 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 and below the exact center frequency of the received signal 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 to high voices will be high pitched and if set too low voices will be low pitched Also there is only one correct speed that will make a particular record procedure t
11. ransceiver may be operated with vehicle engine turned off The unit requires very little current and therefore will not significantly discharge the vehicle battery 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 and 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 the 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 distance A standard antenna connector type SO239 is provided on the transceiver for easy connection to a standard 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 a good metal electrical ground in the vehicle When installed in a boat
12. rocedure paragraphs Coarse operates both TX RX but Fine only in RX CHANNEL SELECTOR This switch selects any one of the forty channels desired The selected channel appears on the LED readout directly above the Channel Selector knob METER This meter indicates received signal strength transmitter RF output power RF POWER HI MED LO This switch is used to select transmitting power In the HI position the transceiver operates in 7 watts RF output power In the MED position the transceiver operates in 4 watts RF output power In the LO position the transceiver operates in 1 watt RF output power OFF ANL NB When the switch is placed in the ANL NB position the RF noise blanker also is activated The RF noise blanker is very effective for repetitive impulse noise such as ignition interference ROGER BEEP SWITCH When this switch is placed in the ROGER BEEP position your radio automatically transmit the audio sign at the end of your transmission The listener can note easily that your transmission is over through the sign 7 15 16 17 10KHz FREQUENCY SHIFT SWITCH When switch is pressed the frequency is shifted 1OKHz up on following channels A channel can be used by setting this switch to 10KHz position Normal 10KHz 3 3A 7 TA 11 11A 15 15A 19 19A RECEIVE TRANSMIT INDICATOR The receive transmit LED indicator is located next to the channel indicator When in receive the LED will be green When in transmi
13. t the LED will be red CHANNEL INDICATOR Numbered LED indicates the selected channel you wish to operate on REAR PANEL 18 19 20 21 22 POWER Accepts 13 8V DC power cables with built in fuse 4 amp to be connected EXT SP Accepts 4 to 8 ohms 5 watt external speaker to be connected When external speaker is connected to this jack the built in speaker is automatically disconnected PA SP Used to connect a PA speaker 8 ohm 4W for PA operation Before operating PA you must first connect a PA speaker to this jack ANTENNA Accepts 50 ohm coaxial cable with a type PL 259 plug to be connected F C The socket is optional for the accessories FREQUENCY COUNTER mode FC 347 to indicate the value of the frequency ranges used 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 two inches from the mouth and speak clearly in a normal voice The radios come complete with low impedance 500 ohm dynamic microphone For installation instructions on other microphones see next section ALTERNATE MICROPHONES AND INSTALLATION OPERATING PROCEDURE TO RECEIVE 1 Ming eS Be sure that power source microphone and antenna are connected to the proper connectors before going to the next step Turn unit on by tuning VOL con
14. 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 EXTERNAL SPEAKER The external speaker jack EXT SPK 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 Operation CONTROL FUNCTIONS There are fourteen controls and three indicators on the front panel of your transceiver FRONT PANEL Sr 1 OFF ON VOLUME inner dual concentric Turn clockwise to apply power to the unit and to set the desired listening level During normal 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 CONTROL outer dual concentric This control is used to cut off or eliminate receiver background noise in the absence of an incoming signal For maximum receiver sensitivity it is desired that the control be adjusted only to the point where the receiver background noise or ambient backgrounds noise is eliminated Turn fully counterclockwise then slowly clockwise until the receiver noise disappears Any signal to be received must now be
15. trol clockwise on your transceiver Set the VOLUME for a comfortable listening level Set the MODE switch to the desire mode Listen to the background noise from the speaker Turn the SQUELCH control slowly clockwise until the noise JUST disappears no signal should be present Leave the control at this setting The SQUELCH is now properly adjusted The receive 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 Set CHANNEL selector switch to the desired channel Set the RF gain control fully clockwise for maximum RF gain Adjust CLARIFIER control to clarify the SSB signals or to optimize AM FM signals OPERATING 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 10 RECEIVING SSB SIGNALS There are four types of signals presently used for communications FM AM USB and LSB When the MODE switch on your unit is placed in the AM position only standard double sideband and in FM position only frequency deviation full carrier signals will be detected An SSB signal may be recognized while in the AM or FM mode by its characteristic Donald Duck sound and the inability of the AM or FM detector to procedure an intelligible output The USB and LSB modes will detect upper sideband and l
16. ug are shown in Fig 5 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 14 Fig 5 Microphone plug pin numbers viewed from rear of pin receptacle Be sure that the housing and the knurled ring of Fig 4 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 the soldering operation best results are obtained when the connections to pins 1 and 3 are made first and then the connections to pins 2 and 4 Use a minimum amount of solder 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 plug are complete 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
17. z SSB 6 dB 2 1KHz 60 dB 3 3KHz More than 65 dB AM FM 10 695 MHz 1 IF 455 KHz 2 IF SSB 10695 MHz 60 dB AM FM amp 70 dB SSB Less than 10 dB change in audio output for inputs from 10 to 100 000 microvolts Adjustable threshold less than 0 5 OV Switchable RF type effective on AM FM and SSB Coarse TX RX 5 KHz Fine RX 1 KHz 4 watts into 8 ohms 300 to 2800 Hz 8 ohms round 8 ohms disables internal speaker when connected 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 the vehicles In automobiles the transceiver is usually mounted below the dash panel with the microphone bracket beside it MOUNTING THE CONNECTION Your 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 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 make sure nothing will interfere with the installation of the mountin
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