User Manual
Contents
1. After the band to which the channel you desire to operate belongs is selected rotate the channel selector to find the channel Rotating the channel selector clock wise or counterclockwise by 1 detent will tune the transceiver 10 kHz upscale or downscale C If you desire to operate on 27 405 MHz first set the Band selector switch to c then turn the channel selector to the position at which the channel readout shows 40 Operation 1 Turn the Volume control clockwise to apply power to the transceiver The LED display should be illuminated 2 Rotate the Squelch control counterclockwise fully 3 Select the mode of reception AM FM 4 Set the RF Gain control maximum position 5 Select the channel desired 6 To transmit depress the transmit switch on microphone to receive release the switch RF Gain Control Ajustment Normally this control should be set to Max Position to provide maximum receiver sensitivity for long range reception However When communicating with a nearby station you may find that the strong signal from this station may cause overloading of your receiver In such a case You can sue this control to reduce the receiver Sen sitivity and thus prevent any overloading and distortion that may occur as a result of the extremely strong incoming signals First set the switch to center and if this posi tion will not provide a sufficient reduction of overloading condition set to minimum Position Frequency2. above this switch indicates the channel selected using an LED Light emitti ng diode digital readout 2 Channel indicator A digital LED display to show channel selected Turned off when operating PA 3 S RF indicator When an incoming signal is received the RX indicator will illuminate and the signal indicator will illuminate to monitor the relative strength of the signal The strength of the incoming signal will depend on the performance of the transmitter and aerial your distance from it and the nature of the surrounding area not on your set s ability to receive the transmitted signal Power output is registered by the LED indicators 4 Band Selector Selects a group of 40 channels in six positions A B C D E or F 240 in all 5 Off Volume Control Varies the sound output form the speaker Also incorporates an on off switch at the extremely counterclockwise position 6 RX indicator Lights up when receiving 7 Squelch Control Used to eliminate any annoying background noise when no signals are present The degree of sensitivity to incoming signals is adjustable When the Squelch control is rotated to the fully clockwise position it provides maximum squelch in the fully counterclockwise position it provides minimum squelch 8 TX indicator Lights up when transmitting 9 RF Gain Control Selects RF Gain receiver sensitivity of the transceiver in variations MAX In this position the receiver section provides maximum s
3. 25 22 26 775 22 27 225 22 27 675 22 28 125 22 28 575 23 26 355 23 26 805 23 27 255 23 27 705 23 28 155 23 28 605 24 26 335 24 26 785 24 27 235 24 27 685 24 28 135 24 28 585 25 26 345 25 26 795 25 27 245 25 27 695 25 28 145 25 28 595 26 26 365 26 26 815 26 27 265 26 27 715 26 28 165 26 28 615 27 26 375 27 26 825 27 27 275 27 27 725 27 28 175 27 28 625 28 26 385 28 26 835 28 27 285 28 27 735 28 28 185 28 28 635 29 26 395 29 26 845 29 27 295 29 27 745 29 28 195 29 28 645 30 26 405 30 26 855 30 27 305 30 27 755 30 28 205 30 28 655 31 26 415 31 26 865 Sie 27 315 31 27 765 31 28 215 31 28 665 32 26 425 32 26 875 32 27 325 32 27 775 32 28 225 32 28 675 33 26 435 33 26 885 33 27335 33 27 785 33 28 235 33 28 685 34 26 445 34 26 895 34 27 345 34 27 795 34 28 245 34 28 695 35 26 455 35 26 905 35 27 355 35 27 805 35 28 255 35 28 705 36 26 465 36 26 915 36 27 365 36 27 815 36 28 265 36 28 715 37 26 475 37 26 925 37 27 475 37 27 825 37 28 275 37 28 725 38 26 485 38 26 935 38 27 385 38 27 835 38 28 285 38 28 735 39 26 795 39 26 945 39 27 395 39 27 845 39 28 295 39 28 745 40 26 505 40 26 955 40 27 405 40 27 855 40 28 305 40 28 755
4. Channel Chart A Band B Band C Band D Band E Band F Band MHz MHz MHz MHz MHz MHz Channel Frequency Channel Frequency Channel Frequency Channel Frequency Channel Frequency Channel Frequency 1 26 065 1 26 515 1 26 965 1 27 415 1 27 865 1 28 315 2 26 075 2 26 525 2 26 975 2 27 425 2 27 875 2 28 325 3 26 085 3 26 535 3 27 985 3 27 435 3 27 885 3 28 335 4 26 105 4 26 555 4 27 005 4 27 455 4 27 905 4 28 355 5 26 115 5 26 565 5 27 015 5 27 465 5 27 915 5 28 365 6 26 125 6 26 575 6 27 025 6 27 475 6 27 925 6 28 375 7 26 135 7 26 585 7 27 035 7 27 485 7 27 935 7 28 385 8 26 155 8 26 605 8 27 055 8 27 505 8 27 955 8 28 405 9 26 165 9 26 615 9 27 065 9 27 515 9 27 965 9 28 415 10 26 175 10 26 625 10 27 075 10 27 525 10 27 975 10 28 425 11 26 185 11 26 635 11 27 085 ll 27 535 11 27 985 11 28 435 12 26 205 12 26 655 12 27 105 12 27 555 12 28 005 12 28 455 13 26 215 13 26 665 13 27 115 13 27 565 13 28 015 13 28 465 14 26 225 14 26 675 14 27 125 14 27 575 14 28 025 14 28 475 15 26 235 15 26 685 15 27 135 15 27 585 15 28 035 15 28 485 16 26 255 16 26 705 16 27 155 16 27 605 16 28 055 16 28 505 17 26 265 17 26 715 17 27 165 17 27 615 17 28 065 17 28 515 18 26 275 18 26 725 18 27 175 18 27 625 18 28 075 18 28 525 19 26 285 19 26 735 19 27 185 19 27 635 19 28 085 19 28 535 20 26 305 20 26 755 20 27 205 20 27 655 20 28 105 20 28 555 21 26 315 21 26 765 21 27 215 21 27 665 21 28 115 21 28 565 22 26 3
5. Operation Manual ARGO 300 240 Channel Mobile AM FM Transceiver General Description This Model is a combination transmitter receiver designed primarily for mobile use It employs the very latest technology to provide 240channels of operation by me ans of digital frequency synthesis with PLL phase locked loop circuitry The use of PLL assures a precise on frequency operation on every channel in bo th transmit and receive mode This model also includes many other features which will provide greater operating convenience and assure optimum communications under a wide range of conditions Operable on 240 channels divided into six groups of 40 channels Full noise reduction features ANL and noise blanker 2 modes of operation AM FM selectable with switch RF power output switchable in 2 ways for required communication range External speaker jack for an extra sound source Electrically floating cliassis for negative ground operation without switching A high sensitivity dynamic microphone equipment CAUNTION FOR REPLACEMENT OF THE FUSE IN DC POWER CABLE PLEASE BE SURE TO USE 2A FUSE Specifications General x x Channel Frequency composition Modulation mode Frequency range Channel spacing Antenna impeadance Power supply source Operating temperature Dimensions Weight Receiver x x Sensitivity Selectivity Squelch range IF Audio output power Sp
6. ce 3 Centre antenna in middle of selected location i e boot gutter or roof 4 Install an antenna cable line away from noise sources ignition system gauges etc 5 Be sure to mount antenna with a good mental to metal ground 6 Prevent antenna cable damage About SWR Antenna performance may be peaked by slightly adjusting its length 1 8 to 1 4 using an SWR standing wave ratio meter This meter is purchased separately or the SWR can be checked professionally Most antennas are factory tuned but this adjustment may improve antenna efficiency An SWR reading below 3 1 is desired as this indicates that over 75 of the transmit power is broadcast power is broadcast into the air The rest is reflected back into your transceiver and dissipated as harmless heat See chart below An SWR of 2 1 or below is good 2 5 or even 3 is usually not user noticeable or significant SWR Reading Output Power Transmitted i i 100 1 3 S 98 3 1 5 1 96 0 L7 a 93 3 2 l 89 0 3 si 75 0 4 1 64 0 gt ql 58 0 6 l 49 0 10 ii 33 0 Channel Selection The transceiver is capable of operation on 240 channels which are divided into 6 groups of 40 channels A B C D E and F These groups are selected with the Band Selector switch as the following Band switch Position Frequency Range A 26 065 to 26 505 MHz 26 515 to 26 955 MHz 26 965 to 27 405 MHz 27 415 to 27 855 MHz 27 865 to 28 305 MHz 28 315 to 28 755 MHz mmg o DW
7. ensitivity so that it can pick up even weak signals Normally this switch should be placed in this position MIN In this position the receiver sensitivity is minimum and the receiver will pick up only the strong signals May be used when receiving strong close signals which are causing overload in receiving sound 10 AM indicator Lights up when operating AM 11 FM indicator Lights up when operating FM 12 Power Selector Enables you to select the RF power output of the transceiver in 2 ways High In this position the transceiver produces full rated RF power for maximum communication range LOW In this position the minimum RF power output is obtained may be used for short range communication 13 Mode switch Selects the mode of reception and transmission AM amplitude modulation FM frequency modulation 14 ANL NB Off Switch In the upper position the ANL is activated lower position the ANL is off and in together with the NB noise blanker 15 Microphone jack Accepts plug form the microphone supplied The jack has a locating key inside and allows the plug inserted in only one way Do not force the plug but align key way properly onto the jack 16 13 8V DC jack 13 8 V DC power for the transceiver supplied through this socket using DC power cable supplied 17 Exermal Speaker jack Used to connect an external speaker 8 Ohm 4 W as an extra sound source Insertion of the plug from a speaker will silence the inter
8. nal speaker automatically 18 Antenna Accepts a PL 259 type coaxial connector from the antenna lead in cable Installation Safety and convenience are the primary factors in deciding exactly where to locate your transceiver The transceiver is designed for ease in control accessibility Be sure that the unit is located so that it does not interfere with the driver or impair access to any controls Connecting cables must be routed and secured in sucha controls Interference from either the operation of the brake accelerator or other controls Interference from either the unit or connecting cables may contribute to the loss of control of the vehicle The transceiver is designed for use with either negative or positive ground electrical systems MOUNTING BRACKET MOUNT SCREW 2 COAXIAL PLUG WASHER 3 2A FUSE HOLDER 12V Battery Positive Terminal PLUS WIRE DC PLUG MINUS WIRE 12V Battery Negative Terminal MICROPHONE BRACKET TAPPING SCREW 2 WASHER 2 Mechanical Mounting Step 1 Use the mounting bracket as a template for marking the location of screwholes under your dash Use an awl nail or other pointed object to mark the metal Step 2 Drill a 3 2mm hole for each screwhole in the mounting bracket Attach the bracket to the dash with the machine screws provided Extreme caution should be exercised when drilling into dash to avoid damage to underdash electronic ignition cruise control i
9. nd installation instructions mounting hardware and a coaxial antenna cable fitted with a fully assembled standard connector type PL 259 for quick connection to your transceiver CB antennas are available in many sizes and styles Base loaded quarter wave antennas are most popular because they require less space than full quarter wave types and are easily installed These antenna types physically shorter but electrically equivalent to full quarte rw ave whip antennas We advise the use of base loaded whips of less than 1 5 meters The antenna s mounted location on the vehicle affects the operation of the radio Transmission and reception characteristics vary for different antenna locations Thr ee of the most popular antenna mountings are shown on next page Roof mount The antenna mounted on roof represents a transmission reception range closest o ideal Front cowl mount The radiation pattern is slightly greater in the direction of the rear bumper opposite the side on which the antenna is mounted Provides case in antenna mounting Rear deck mount The radiation pattern is strongest in the direction of the front bumper opposite the side on which the antenna is mounted 8 Roof Mount Front Cowl Mount Rear Deck Mount Zs pos e D General rules for best mobile antenna performance 1 Mount antenna on vehicle as high as possible 2 The higher percentage of the antenna length mounted above rooftop the better performan
10. nstrument and or accessory wiring J Step 1 With negative ground system connect the red wire one with in line fuse holder to either the a fuse block b cigarette lighter or C directly to the positive post on the battery Usually the fuse block is the most conv enient connecting point It is also possible to connect to the Accessory terminal on the fuse block or ignition switch so that your CB unit automa tically goes off preventing accidental battery drainage Then tightly connect the black wire directly to the vehicle s metal frame Step 2 With positive ground system reverse the wires connecting the red fuseh older wire to the frame the black wire to your DC power source A light or meter can be a good aid in locating a suitable power source and ground In either case a good direct metal to metal ground is essential for optim um performance Connect your antenna system to the antenna connector If you are using an external speaker or a PA speaker connect it to the appropriate jack one unit rear panel CB Antennas Note The licence requires that equipment which have provision for the connection of an external antenna shall not be connected to other than a single element rod or wire antenna not exceeding 1 5m in overall length For best reception and transmission your radio should use an antenna especially designed for a frequency of 27 7 MHz Antennas are purchased separately and sup plied with assembly a
11. rious response Transmitter RF output power Frequency stability Modulation capability Sprious emission 240 channel 40CH X 6 Digital phase locked loop synthesizer AM FM Band A 26 065 26 505 Mhz B 26 515 26 955 C 26 965 27 405 D 27 415 27 855 E 27 865 28 305 F 28 315 28 755 50 Ohm 13 8 Volt DC Only negative ground 10 C 50 160 W X 55 H X 210 D mm 1 100 g AM 1uV S N 10dB FM 1uV S N 20dB 60 dB 0 2 uV 500 uV 1 st 10 695 MHz 2nd 455 KHZ 2 watts at 8 Ohm 50 dB AM FM High 7 watt Low 4 watt 0 005 AM 100 FM _ 2 5 Khz deviation max 60 dB 3 CONTROL LOCATIONS Fig 1 Fig 2 1 Channel Selector 15 Microphone Socket 2 LED Channel Indicator 16 Power Socket 3 Signal Strength Powe 17 External Speaker Socket Output Indicators 18 Coaxial Acrial Socket 4 Band Selector 5 On Off Volume Control 6 Receive Indicator 7 Squelch Control 8 Transmit Indicator 9 RF Gain Control 10 AM Indicator 11 FM Indicator 12 RF power switch 13 Model selector Switch 14 ANL NB Off Switch FRONT VIEW 4 3 2 1 Li FT AM FM 7 m RF GAIN Tire ODE Ag a aH cer 5 6 7 8 910111213 14 Fig 1 REAR VIEW 18 17 16 15 Fig 2 Operating Controls and Features 1 Channel selector A 40 detent rotary switch to select any of 240 channels in conjunction with the Band Selector switch Window
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