Manual - Bells CB Radio
Contents
1. INTRODUCTION This section explains the basic operating procedures for the DX 2517 amateur base station transceiver CONTROL 8 CONNECTIONS 1 POWER ON OFF CONTROL Push ON to apply power to the unit 2 RF SWR METER This meter operates during transmit only It reads power output or SWR 3 SWR CAL SWITCH This switch is used with the CALIBRATE pot No 12 to measure your SWR Simply put this switch in the CAL position Then transmit in AM FM or CW while adjusting the CALBRATE pot until the needle on the left meter goes to the small red Notch on the SWR scale You may need to be at maximum power to reach the SET mark Now while still transmitting put this switch up to the SWR Lhe un T oo position This will give you an SWR reading When you are finished be sure to turn the CALIBRATE pot fully CCW to the RE position so you are able to read your output power You will hear the RF switch click on NB ANL SWITCH This switch controls the Noise Blanker and Automatic Noise Limiter simultaneously They are turned on and off together The noise Blanker is very effective for eliminating repetitive impulse noise such as ignition interference The Automatic Noise Limiter reduces strong atmospheric or man made interference ROGER BEEP SWITCH When this switch is placed in the ROGER BEEP position the radio2. Galaxy DX 2517 AM FM SSB CW PA Amateur Base Station Transceiver OWNER S MANUAL TABLE OF CONTENTS SPECIFICATIONS ccoo INSTALLATION o cocoa ar OPERATION Introduction Control amp Connections 2 0 0 0 eee eeeec cece eeeeeeeeeeeeees Rear Panel Microphone Operation Connectors 2 10 11 11 SPECIFICATION GENERAL Frequency Range Emission Types Frequency Control Frequency Tolerance Frequency Stability Temperature Range Antenna Impedance Antenna Connectors Meter Function 28 765 29 205 MHz CW FM AM USB LSB Phase Lock Loop Synthesizer 0 005 0 003 30 C to 55 C 50 Ohms Standard SO 239 Type Meter 1 RF Output Power Antenna SWR Received Signal Meter 2 RAAMNMO AC Input Voltage TRANSMITTER RF Power Output AC 120V 60 Hz 25W USB LSB 10W AM FM CW Antenna Connectors UHF Type 50 Ohms AM Modulation Up to 100 Clarifier Range 5KHz XMT amp REC 1 5KHz REC only Spurious Emissions 60dB Carrier Suppression RECEIVER Sensitivity for 10dB S N Sensitivity for 20dB S N 60dB AM 0 5uV FM 0 25uV Sensitivity for 10dB S N USB LSB 0 3uV Adjacent Channel Rejection 60dB Image Rejection Ratio 50dB AGC Figure of Merit
3. Audio Output Power 10 25 THD SSB AM 80 dB for 50mV for 10 dB Change in Audio Output OW SPECIFICATIONS SUBJECT TO CHANGE WITHOUT NOTICE Strength INSTALLATION Location Connection The transceiver should be placed in a convenient operating location close to an AC power outlet and the antenna lead in cable s The transceiver is powered with the AC power cord set Proceed as follows to complete all necessary connections to the transceiver 1 Your transceiver has a standard SO 239 connector on the rear panel for easy connection to standard PL 259 coax plug If the coax antenna cable must be made longer use coax cable with impedance of 50 ohms and use only enough cable to suit your needs This will insure a proper impedance match and maximum power transfer from the transmitter to the antenna 2 AC Power Operation Use 120 volts AC Noise Interference There are several kinds of noise interference you may encounter in base station operation Some of these noise sources are fluorescent buzz nearby commercial broadcast electrical appliance lawnmower and electrical storms etc Commercial products are available to reduce interference from these sources Consult your dealer or professional amateur radio supply shops Antennas Antennas are purchased separately and include installation instructions Numerous type of antennas are available that range from emphasis on easy of installation to emphasis on performan
4. fully clockwise Press the push to talk switch on the microphone and speak directly into the microphone 3 Adjust the MIC gain down if the person you are talking to says your are too loud N m C MICROPHONE GAIN CONTROL A preamplifier circuit is built into the radio to increase the microphone gain Experiment with the control for setting that will best suit your individual use Note When the microphone gain control is set to maximum ambient noise may also be picked up by the microphone In high noise situations low microphone gain setting may produce the best results The microphone gain control is also used to adjust PA loudness D PUBLIC ADDRESS OPERATION To use this feature of the transceiver a speaker having a voice coil impedance of 8 to 16 Ohms and power handing capability of least 3 watts should be connected to the PA SP jack on the rear panel Be sure that there is physical separation between the microphone and the PA speaker itself If the PA speaker is located very close the microphone acoustic feedback will result when the PA amplifier is operated at high volume or when PA is used indoor Adjustment of PA volume is made with MIC GAIN control E S W R MEASUREMENT Most antenna are factory tuned but the antenna efficiency may be peaked by slightly adjusting the length of antenna using the SWR meter built into the unit This adjustment may improve the antenna standing wave ratio SWR The SWR permits you to deter
5. accepts 50 ohm coaxial cable with a type PL 259 plug to be connected 10 6 REC JACK The RCA type pin jack provides audio output for connection to a tape recorder This can be used to record incoming signals or your voice when transmitting 8 FREQUENCY COUNTER JACK The RCA type jack provides a signal used by some frequency counters so you can read the frequency digitally This readout signal operates on transmit only 4 CW KEY Use for Morse Code operation Connect a CW key to this jack and place the MODE switch in the CW position 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 To transmit hold the microphone about two inches from your mouth and speak clearly in a normal voice The radio comes complete with a low impedance dynamic microphone OPERATION PROCEDURE A PROCEDURE TO RECEIVE 1 Make sure that the power cord microphone and antenna are connected properly 2 Turn the volume down to about the nine o clock position Set the mode switch Push the power switch on The meter and display LED s should light up unless the dimmer control is set too low Select the desired frequency Adjust the receive gain for maximum Set the squelch as desired Use the COARSE FINE control as necessary to tune signals in properly mn ee nd 11 B PROCEDURE TO TRANSMIT Set the MIC gain
6. automatically transmits an audio tone at 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 NOISE FILTER This filter 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 10KHz SWITCH This switch adds 10KHz to the frequency being used Example if frequency counter display 28 765 flip the switch and the display will read 28 775MHz SIGNAL MODULATION METER This meter indicates signal strength of incoming signals during receive and your percentage of modulation when transmitting in the AM Modulation readings are most accurate when using maximum output power The modulation meter does not work at all in FM or SSB 9 CHHANEL DISPLAY The channel display indicates the current selected channel 10 FREQUENCY COUNTER The frequency counter indicates the frequency of operation 11 MICROPHONE JACK Used to connect microphone for voice source 12 CALIBRATE CONTROL In the RF position the left meter reads power output in watts When rotated clockwise it is used in conjunction with the SEW CAL switch No 3 13 DIM CONTROL Controls the brightness of the met
7. ce Often the difference in performance between many of the antenna is modest 1 Vertical Ground Plane Antennas These are omni directional antennas that provide optimum performance for contacting other fixed stations using vertical type antenna in addition to all mobile stations For medium long range communications work 2 Directional Beam Antennas Highly efficient and directional antennas generally intended for fixed to fixed very long range communications Remote 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 3 watts When the external speaker is plugged in the internal speaker is disconnected Note The PHONE jack on the front panel overrides both external and internal speakers When the plug from a headphone is plugged to the PHONE jack both internal and external speakers are silenced simultaneously Public address An external 8 ohms 3 Watt speaker must be connected to the PA jack located on the rear panel when the transceiver is used as a public address system The speaker should be directed 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 me aXs5X6X7 8 9 4 26 Cali ox 2517
8. er lamps and display digits 14 TALK BACK This is a switched pot that controls the volume of the talkback sound It does not affect the sound your transmitting You can turn the talkback off Fully CCW or adjust the volume as you desire This talkback circuit can be used anytime even without any sound effects 15 RF GAIN CONTROL This control is used to reduce the gain of the RF amplifier under strong signal conditions 16 MIC GAIN CONTROL This control adjusts the microphone gain in the transmit mode This feature is designed for use in a high ambient noise environment or to maximize talk power 17 TIME ECHO CONTROL This TIME control pot turns the ECHO on and off and is used to set the time delay of the ECHO repetitions The ECHO control sets the intensity of the ECHO effect 18 CHANNEL SELECTOR This control is used to select a desired frequency 19 MODE CONTROL This control allows you to select one of six operating modes PA FM AM USB LSB CW 20 BAND SELECT SWITCH This switch is allow the user to select the desired band 21 SQUELCH CONTROL This control is used to control or eliminate receiver background noise in the absence of incoming signal For maximum receiver sensitivity it is desired that the control be adjusted only to the point where the receiver background noise is eliminated Turn fully counterclockwise then slowly clockwise until the receiver noise disappears Any signal to be received must no
9. mine how well matched the antenna and its cables are to your transceiver 12 Set the unit in the receive mode as instructed under the operating procedure to receive section Set the mode switch to AM position the SWR CAL switch to the CAL position Press the push to talk switch on the microphone and turn the calibrate control clockwise past click so that the SWR meter pointer exactly coincides with the set mark on the scale Release the push to talk switch Set the SWR CAL switch to the SWR position and depress the push to talk switch again The SWR of your antenna is read directly on the scale WARRANTY This radio has a one year parts and labor warranty For warranty service please contact your dealer BE SURE TO VISIT OUR WEB SITE AT www galaxyradios com 14 15 PRINTED IN TAIWAN ATOSSBO10W
10. w be 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 signal will be heard at a maximum clockwise setting 22 RF POWER This control is used to adjust the RF power output level you want in AM or FM transmission 23 VOLUME CONTROL Permits you to adjust the listening level when receiving 24 COARSE FINE CONTROL The COARSE control adjusts the frequency 5 0KHz in receive and transmit The FINE control adjusts the frequency 1 5KHz in receive only This comes in handy when tuning in someone who is OFF frequency compared to everyone else 25 PHONE JACK Accepts a plug from a headset of 4 to 32 Ohm impedance 26 MODE LED INDICATORS The lighted LED indicates which mode the radio is in 27 RX TX LED Lights green during receive and changes to red during transmit REAR PANEL CONNECTOR E 2X3 4 5 6 AC POWER CORD Connects to AC power outlet for AC mains supply 2 FUSE Accommodates a fuse for AC input circuit protection Use 125V 7A fuse for replacement 3 EXTERNAL SPEAKER This jack accepts 4 to 8 ohms 5 watt external speaker When the external speaker is connect to this jack the built in speaker will be disabled 4 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 5 ANTENNA This jack
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