User`s Manual
Contents
1. lt FRONT PANEL gt 1 OFF ON VOLUME Inner Dual Concentric Turn clockwise to switch on the CB radio and set desired volume level Under normal operating state the VOLUME control is used to adjust the output volume obtained either by the transceiver speaker or the external speaker or the external PA speaker if used 2 SQUELCH 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 background noise is eliminated Turn fully anticlockwise then slowly clockwise until the receiver noise disappears Any signal to be received must now 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 signals will be heard at a maximum clockwise setting 3 ECHO inner Dual Concentric This switch is used to control echo effect 4 TONE Outer Dual Concentric This switch is used to control intervals of echo sound 5 RF GAIN Inner Dual Concentric This switch is for adjusting sensitivity during reception For long distance communications RF GAIN should be set to maximum RF GAIN can be reduced to avoid distortion when your correspondent is close by and when he does not have RF POWER The normal setting of this functi2. speaker to this jack 25 ATTENNA Accept 50 ohm coaxial cable with a type PL 259 plug to be connected 26 CW KEY This jack is for Morse code operation To operate connect a CW key to this jack and place the MODE switch in the CW position LCD display icon CW lt PRESS TO TALK MICROPHONE gt The receiver and transmitter are controlled by the Press To Talk switch on the microphone Press the switch to transmit and then release it 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 150 ohm dynamic microphone revised picture 26 PTT Transmitting key Press to speak and release to receive a message 27 UP DN These key allow increasing or decreasing a channel number 28 AQ When the radio is receiving a call press this key to enable ASQ Automatic Squelch Control function Then AQ would appear on the LCD Press this key repeatedly to switch on off the function When the radio is receiving a call press and hold this key for over 2 seconds to enable signal monitoring function At the moment whether the radio receive signal or not the radio would detect current channel to check whether current channel has weak signal Release AQ key to exit this function 3 Pressing PTT and AQ key at the same time the radio would emit a single tone This tone is to help and remind two sides
3. In tuning process 2 icon will appear on the LCD T When this option is selected users can only regulate the transmitting frequency In tuning process 3 icon will appear on the LCD Default RT PUS PUSH Function Setting Oe i ae E Du me This menu is to set functions realized via PUSH knob Options are as follows COA When this option is selected press PUSH and turn CLARIFIER knob to realize COARSE function When pressing this key 2 icon will appear on far left of the LCD Under this condition rotate the CLARIFIER knob to change frequency of both transmitting and receiving T When this option is selected press PUSH and turn CLARIFIER knob to change transmitting frequency When pressing this key 3 icon will display on the far left of the LCD Under this condition rotate the CLARIFIER knob to change the transmitting frequency only STP When this option is selected PUSH function will change Frequency Tuning Step of CLARIFIER knob Press this key then the corresponding frequency bit would blink Default STP ASQ Automatic Squelch Control JZ FF m7 Oo ASQ control setting It has same function with AQ button on the microphone Default OFF TOT Transmitting Time Out Timer L E on Coc 180 This menu is to set transmitting TOT time When pressing PTT key at a single time longer than the due time setup in advance the radio would stop transmitting automatically and loudspe
4. of communication to adjust frequency The frequency of this tone is adjustable ASQ Automatic Squelch Control ASQ control setting It has same function with AQ button on the microphone 29 MICROPHNE The radios come complete with low impedance 150 ohm dynamic microphone Function Menu Setup The initial functions and parameter can be changed via the following settings and operations Please read the following instruction before making any desired amendments To enter Function Menu under ON state press and hold FUNC key for more than 2seconds and then release the FUNC key to enter into the Function Menu Setup Under this condition press FUNC key to select different functions menu CHANNEL SELECTOR Switches to change the data of Function Menu STP Frequency Tuning Step D 1 O TE Lr rr This menu is to set tuning step when adjusting frequency by CLARIFIER knob Options 10HZ 100HZ 1KHZ 10KHZ Default 10HZ CLA CLARIFIER knob functions setting It CE Ll a mn This menu is to set functions turned by CLARIFIER knob Options are as follows FIN Fine regulation When this option is selected users can fine tuning the receiving frequency by rotating the CLARIFIER knob In tuning process the transmitting frequency can not be regulated by the knob and 1 icon will appear on the LCD RT When this option is selected users can regulate the frequency of both transmitting and receiving
5. 45 dB adjustable for optimum signal reception Automatic Gain Less than 10 dB change in audio output for inputs from 10 to Control AGC 100 000 microvolt Squelch Adjustable threshold less than 0 5 uV Automatic Squelch Control only AM FM 0 5 pV ANL Switchable Noise Blanker RF type effective on AM FM and SSB Audio Output Power 4 watts into 8 ohms Frequency Response 300 to 2800 Hz Built in Speaker 8 ohms round External Speaker Not Supplied 8 ohms disables internal speaker when connected
6. AT 5555 RADIO USER S MANUAL TABLE OF CONTENTS WARNIGN RESET FUNCTION FUNCTIONS amp FEATURES INSTALLATON Where and how to Mount Your CB Radio Antenna Installation Power Connection Basic Operation Adjustment of SWR Standing Wave Ratio HOW TO USE YOUR CB LCD DISPLAY FRONT PANEL PEAR PANEL PRESS TO TALK MICROPHONE FUNCTION MENU SETUP OPERATING PROCEDURE TO RECEIVE OPERATING PROCEDURE TO TRANSMIT SPECIFICATION WARNIGN To use the radio please connect the antenna to the location B on the back panel of the equipment firstly and then set the SWR Standing Wave Ratio before transmitting Failure to do so may result in destruction of the power amplifier which is not covered by the guarantee Welcome to Use Welcome to the world of new CB radios The new AT 5555 Radio provides you with top performance and best visual enjoyment With the use of SMT technology to guarantee the best stability reliability and unprecedented quality your multi functional AT 5555 Radio 10 meter Radio is a new step in personal communication and is surely the best choice for professional users of CB radios Moreover with multiple connecting ports in the radio AT 5555 Radio is ready for future upgrading and functions expanding To ensure that you use the radio to the fullest please read this manual carefully before installing and using your AT 5555 Radio RESET FUNCTION Resume Factory Default This CB Radio introduces RESET FUNCTION to prevent acci
7. EP for prompting when press any key press FUNC RB repeatedly to switch on off the function 17 NB ANL or LOCK Press NB ANL key to enable NB ANL function with NB ANL icon appearing on the LCD display Press the key repeatedly to switch on off the function Noise Blanker Automatic Noise Limiter These filters allow reducing back ground noises and some reception interferences FUNC NB ANL Press FUNC NB ANL to realize the Keyboard Lock function When this function is enabled all keys are invalid except PTT BAND SWITCH and MODE SWITCH When pressing any key except PTT BAND SWITCH MODE SWITCH the LOCK icon will display on the LCD The situations indicate that the keyboard has been locked Press FUNC NB ANL repeatedly to switch on off the function 18 DW or LCD OFF The DW dual watch function allows automatic alternate monitoring of two channels Refer to the following procedures to enable this function To enable the DW function firstly turn the SQ control clockwise until the background noise is cut out Select the first channel to be monitored by using the CHANNEL SELECTOR knob or the channel selector keys on the microphone Press the DW key and the DW icon will flash on the LCD display Secondly follow the above procedures to select second channel to be monitored Finally press the DW key again and the two monitoring channels will be alternately indicated on the LCD Radio will automatically start monitoring scanning the two
8. OC Il SL This menu is to select CW Side Tone Frequency from 300HZ 3KHZ the shift step is 10HZ Default 1050HZ 3 TON Transmitting Single Tone Frequency l waco Lom HE This menu is to select Transmitting Single Tone Frequency from 300HZ 3KHZ The shift step is 10HZ Default 1050HZ OPERATING PROCEDURE TO RECEIVE 1 Be sure that power supply microphone and antenna are connected to the proper connectors before going to the next step 2 Turn the radio on by tuning VOLUME control clockwise 3 Rotate the VOLUME knob to set a comfortable listening level 4 SET the MODE switch to the desired mode 5 Set the CHANNEL selector switch to select the desired channel 6 Set the RF gain control full clockwise to maximum RF gain 7 Listen to the background noise from the speaker Turn the SQUELCH control clockwise slowly until the noise disappears no signal should be present Leave the control at this setting The Squelch 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 can not be heard OPERATING PROCEDURE TO TRANSMIT 1 Select the desired channel of transmission 2 Press the Push To Talk switch on the microphone and speak in a normal voice SPECIFICATIONS General Frequency Range 25 615MHZ 30 105MHZ Programmable Frequency Band A B C D E F Channel 60 channels programmable in
9. YOUR CB RADIO lt LCD Display gt FUNC AQ RB NB ANL BP ECHO VOIC HI CUT DW 10k OOOOO8 Sw e OA AA A A A E a SC PA CW AM FM USB LSB gt CAL LL 7 9 o 30 7 digits Display frequency and any other information Indicating bars Indicate RX RSSI PA PWR SWR The first decimal point Appears when current channel is edited with SCAN DEL FUNC Appears after pressing FUNC key AQ Appears when ASQ function is started only for AM FM RB Appears when Roger beep function is started enabled NB ANL Appears when NB ANL function is started enabled BP Appears when BP function is started enabled ECHO Appears when ECHO function is started enabled VOIC Appears when VOIC function is started It is disabled in this CB radio HI CUT Appears when HI CUT function is started DW Appears when DW function is started 10K Appears when 10KHZ function is started EMG Appears when EMG channel is used SWR Appears when SWR is used SRF Appears when S RF is used SC Appears when SCAN is used PA CW AM FM USB LSB Indicate different operating modes 1 Appears when CLARIFIER function is FINE operation 2 Appears when CLARIFIER FUNCTION is COARSE operation or RT operation 3 Appears when CLARIFIER FUNCTION is transmitting frequency regulated T z QO lt SC list HI CUT ToT F VOL SQ E TONE RF GAIN RF PWR o T 6
10. aker will emit voice prompt till PTT key is released Then the radio can transmit again Options 30 600s Step 30s Default 180s SC Scanning Type Selection m 5L G4 This menu is to set Scan Type Options are as follows SQ When SQ is selected scan would stop when a valid signal is detected The radio would resume scanning after signal disappears for 5s Tl When TI is selected scan would stop when a valid signal is detected The radio would resume scanning 5 seconds later whether signal disappears or not Default SQ TSR Transmitting SWR Protection l cor oO This menu is to choose whether to enable Transmitting SWR Protection function or not ON When ON is selected the radio will detect the SWR of antenna Once the SWR is beyond the SWR set in advance the radio would prohibit transmitting automatically and loudspeaker will emit voice prompt Then HI S icon will display on the LCD to remind you that the antenna SWR is too high or antenna do not connect well OFF When OFF is selected SWR Protection function is disabled NOTE To protect the radio from long transmission under high SWR the radio would automatically start SWR Protection once the SWR Value is higher than 20 1 Default ON SWR lt 10 1 TDC Power Supplied Voltage Protection li l on m o lal l This menu is to choose whether to enable Power supplied Voltage Protection function or not ON When ON is s
11. channels When a signal is detected on one of the channels scanning stops and it is possible to listen the communications on that channel Press PTT to transmit on this channel If there is no transmission or detected signal on that channel within 5 seconds time to resume scanning can be programmed by PC software radio will resume scanning When the DW function is enabled the DW icon appears on the LCD To exit the DW function press the DW key or the PTT key The scan Type above is the SQ mode under SCA Selection in Function Menu If Tl mode is selected and valid signal is detected the radio would still start scanning when it is time to resume scanning whether there is signal or not in current channel FUNC DW When this function is enabled LCD display would be switched OFF LCD OFF Repeat this operation to switch ON OFF the function 19 SCAN OR _ Scan list SCAN Automatic Scanning of busy channels Press the SCAN key to enable the SCAN function Before enabling the SCAN function firstly turn the SQ control clockwise till the background noise is cut out Then press the SCAN key radio will automatically scan all channels continuously in the scan list and the SC icon will appear on the LCD When a signal is detected on a channel scanning stops on this channel You can receive the calling and also can transmit on this channel by pressing PTT key If there is no transmission or detected signal on that channel within 5 seconds time to
12. dents and provide a solution for customers who changed some functions unconsciously and do not know how to resume normal settings The CB Radio will resume factory default once this function is activated How to Operate Step 1 Power off the radio Step 2 Press and hold FUNC and SCAN keys at the same time then release the two keys when LCD displays RES All former settings would be replaced by Factory Default value when LCD displays REND WARNING All former settings would be replaced by Factory Default value after operating the RESET FUNCTION FUNCTIONS amp FEATURES 1 Big LCD which displays frequency and all kinds of information 2 DUAL DIGITAL TUBE FOR CHANNEL DISPLAY 3 USE EL technology for backlight 4 PA CW AM FM USB LSB mode 5 A B C D E F 6 bands in total with 60 channels at most in each band to be programmed 6 Frequency Tuning Step can be 10HZ 100HZ 1KHZ or 10KHZ 7 Multiple CLARIFIER Operating Modes 8 Flexible menu functions and PC programming software to meet varied customer demands 9 ECHO Function 20 21 22 23 24 25 SQ ASQ Function FM and AM mode only RF GANI ADJUSTMENT RF PWR ADJUSTMENT SCAN FUNCTION RB FUNCTION NB ANL FUNCTION DW DUAL WATCH FUNCTION BEEP VOICE PROMPT 10KHZ Function SWR S RF DC Voltage display function TOT function HI CUT FUNCTION EMG CALL SWR PROTECTION POWER SUPPLIED VOLTAGE PROTACTION Key L
13. each band Frequency Control Phase Locked Loop Synthesizer Frequency Step 10Hz 100 Hz 1K Hz 10K Hz Frequency Tolerance 0 005 Frequency Stability 0 001 Temperature Range 30 Cto 50 C Microphone Plug in dynamic with push to talk UP DN ASQ switch and coiled cord Input Voltage DC 13 8V normal 15 9V max 11 7V min Transmit AM full mod 5A Receiver Squelched 0 6A SSB 21W PEP output 6A Size 28 25 6CM Weight 1 85kg Antenna Connector UHF SO239 TRANSMITTER Power Output AM FM CW 12W SSB 21W PEP Modulation High and low level class B Amplitude Modulation AM Varied Capacitance Frequency Modulation FM Inter modulation Distortion SSB 3 order more than 25dB 5th order more than 35dB SSB Carrier Suppression 55dB Unwanted Sideband 50dB Frequency Response AM and FM 450 to 2500HZ Output Impedance 50ohms unbalanced Sensitivity SSB 0 25yV for 10dB S N N at greater than 1 2 watt of audio output AM 1 0uV for 10 dB S N N at greater than 1 2watt of audio output FM 1 0 uV for 20 dB S N N at greater than 1 2 watt of audio output Selectivity AM FM 6dB 3KHz 50dB 9KHz SSB 6 dB 2 1KHz 60dB 3 3KHz Image Rejection More than 65dB IF Frequency AM FM 10 695 MHz 1st IF 455 KHz 2nd IF SSB 10 695 MHz Adjacent Channel 60dB AM FM amp 70 dB SSB Rejection RF Gain Control
14. elected the radio will detect the supplied voltage Once the voltage surpasses the voltage setup in advance the radio would display DC LO or DC HI to remind you that the voltage is not in normal state Meanwhile the radio will prohibit transmitting and emit beep prompt OFF When OFF is selected the Power Supplying Voltage is disabled Default ON DC 10 5V 16V TLD Content displayed on the LCD when transmitting Ls al Le Lo EF ja This menu is to set the content displayed on the LCD when transmitting TF When TF is selected LCD would display transmitting frequency when transmitting SR When SR is selected LCD would display SWR value of antenna when transmitting for example 1 2 on the LCD BAT When BAT is selected LCD would display Supplied Voltage when transmitting for example 13 8DC on the LCD TOT When TOT is selected LCD would display TOT remaining time when transmitting And TOT would count down till remaining time is 0 for example 170 displayed on the LCD display Default TF RBF ROGER BEEP Frequency Setting L win co ya This menu is to select frequency of Roger Beep The frequency range is 300KHZ 3KHZ The shift step is 10HZ Default 1050HZ DRBT ROGER BEEP Holding Time ot con coc bar bathed This menu is to select Roger Beep Holding Time from 50ms 1000ms The shift step is 50ms Default 500ms CFR CW Side Tone Frequency rc wICn L
15. g car roof or lid of the boot and Adjustable Antenna which offer a much larger frequency range and can be used on a smaller ground plane For an antenna which must be fixed by drilling you will need a good contact between the antenna and the ground plane To obtain this you should lightly scratch the surface where the screw and tightening star are to be placed Be careful not to pinch or flatten the coaxial cable as this runs the risk of break down and or short circuiting Connect the antenna to location B c Fixed antenna A fixed antenna should be installed in a space as clear as possible If it is fixed to a mast it will perhaps be necessary to stay it according to the laws in force you should seek professional advice All AT 5555 antennas and accessories are designed to give maximum efficiency to each CB radio within the range 3 POWER CONNECTION Your RADIO is protected against an inversion of polarities However before switching it on you are advised to check all the connections Your equipment must be supplied with a continued current of 12 volts A Today most cars and lorries are negative earth You can check this by making sure that the negative terminal of the battery is connected either to the engine block or to the chassis If this is not the case you should consult your dealer WARNING Lorries generally have two batteries to supply a voltage of 24 volts in which case it will be necessary to in
16. ock Function INSTALLLATON 1 WHERE AND HOW TO MOUNT YOUR MOBILE CB RADIO a You should choose the most appropriate setting from a simple and practical point of view Your CB radio should not interfere with the driver or the passengers Remember to provide for the passing and protection of different wires e g power antenna accessory cabling so that they do not in any way interfere with the driving of vehicles To install your equipment use the cradle 1 and the self tapping screws 2 provided drilling diameter 5 mm Take care not to damage the vehicle s electrical system while drilling the dash board Do not forget to insert the rubber joints 3 between the CB and its support as these have a shock absorbing effect which permits gentle orientation and tightening of the set Choose where to place the microphone support and remember that the microphone cord must stretch to the driver without interfering with the controls of the vehicle OD s LE Li Ol 040 Ei 10 METER RADIO 2 ANTENNA INSTALLATION a Choosing your antenna For CB radios the longer the antenna the better its results Your dealer will help you with your choice of antenna b Mobile antenna Must be fixed to the vehicle where there is a maximum of metallic surface ground plane away from windscreen mountings There are two types of antenna Pre Regulated Antenna which should be used on a good ground plane e
17. on is on maximum fully clockwise 6 RF POWER Outer Dual Concentric Adjustment of the output power is for AM and FM mode only Reducing the power is allowed when communicating with a person who has no RF GAIN The normal position of this function is set to maximum fully clockwise 7 BAND SELECTOR Rotate this switch to select A B C D E F band of operation 8 MODE PA CW AM FM USB LSB This switch allows selecting the modulation mode PA CW AM FM LSB or USB Your modulation mode has to correspond with the one of your correspondent The mode selector changes the mode of operation of both transmitter and receiver simultaneously Frequency Modulation FM for nearby communications on a flat open field Amplitude Modulation AM Communication on a field with relief and obstacles in middle distance the most used Upper and Lower Side Band USB LSB Used for long distance communications according to the propagation conditions 9 CLARIFIER This is frequency tuning knob which can be set as different modes refer to CLA Specifications in Functions Menu for more details 10 PUSH This is PUSH Key which can be set as different modes refer to PSH specifications under Functions Menu for more details 11 CHANNEL SELECTOR Rotate this switch to select any desired channel from forty citizens band channels The selected channel appears on the LED directly above the channel selector knob 12 CHANNEL INDICATOR Numbered LED indicate
18. resume scanning can be programmed by PC software radio will start scanning again To exit the SCAN function press the SCAN key or the PTT key The Scan Type above is the SQ mode under SCA Selection in Function Menu If Tl mode is selected and valid signal is detected the radio would still start scanning when it is time to resume scanning whether there is signal or not in current channel FUNC SCAN SC LIST Scan ADD or Delete Press FUNC SCAN to delete current channel from scan list The first digit on LCD would display When Scan function is enabled the radio would skip the deleted channel Repeat this operation to Add or Delete channels from scan list 20 10KHZ or HI CUT 10KHZ Press this key to shift frequency up by 10khz When pressing this key 10KHZ would appear on LCD and frequency of channels is shifted up by 10 KHZ Repeat this operation to switch ON OFF this function FUNC 10KHZ Press FUNC 10KHZ to realize HI CUT function Once this function is enabled the radio would cut out high frequency interference Its use depends on reception conditions When this function is enabled HI CUT would appear on LCD Repeat this operation to switch ON OFF the function 21 SWR OR TOT SWR When pressing this key SWR icon would appear on the LCD When transmitting SRF bars indicate SWR value other than PA or PWR value One bar displaying on the LCD indicates that SWR value is 1 0 Each additional bar indicates every 0 1 added
19. rotary knob 5 ADJUSTMENT OF SWR standing wave ratio WARNIGN This must be carried out when you use your CB radio for the first time and whenever you re position your antenna The adjustment must be carried out in an obstacle free area 5 Adjustment with a built in SWR meter or external SWR meter a To connect the SWR meter Connect the SWR meter between the CB radio and the antenna as close as possible to the CB radio use a maximum of 40cm cable b To adjust the SWR meter Set the CB to channel 20 D band in FM put the switch on the SWR meter to position CAL or FWD Press the lt lt Push To Talk gt gt switch on the microphone to transmit Bring the index needle to v by using the calibration key Change the switch to position SWR reading of the SWR level The reading on the meter should be as near as possible to 1 If this is not the case re adjust your antenna to obtain a reading as close as possible to 1 An SWR reading between 1 and 1 8 is acceptable It will be necessary to re calibrate the SWR meter after each adjustment of the antenna 6 HOW TO USE INTERNAL SWR METER Set CB to channel 20 D band in FM Press lt lt push to talk gt gt button on the microphone to transmit At the moment LCD would display SWR value which should be as close as possible to 1 If this is not the case re adjust your antenna to obtain a SWR value as close as possible to 1 an SWR reading between 1 and 1 8 is acceptable HOW TO USE
20. s the selected channel you wish to operate on 13 RECEIVER TRANSMIT INDICATOR When it is receiving the LED will be green The LED will be red when it is transmitting 14 LCD DISPLAY Display frequency all kinds of information and icons 15 FUNC This is functional key Press and hold this key for 2seconds to enter into Functions Menu Setup refer to Functions Menu for more details Press FUNC key and other individual key to realize the second functions silk screened under the button For example press FUNC key followed by pressing RB key to realize the BP function Press FUNC key followed by DW to realize the LCD OFF function Details operations are as bellows Press FUNC key FUNC icon will appear on LCD display Release FUNC key and then press other keys to realize the second functions silk screened under the button FUNC Keypad name is to be used in the following operating instruction 16 ROGER BEEP OR BEEP FUNCTION RB Press RB key to enable RGOER BEEP function with RB icon appearing on LCD display Press the key repeatedly to switch on off the function When RB function is enabled the radio will automatically transmit the audio signal at the end of your transmission The listener can note easily that your transmission is over through the signal FUNC RB Press FUNC RB to realize to realize BP Function It is a prompting function with BP icon appearing on LCD display Speaker would emit a BE
21. sert a 24 12 volt converter into the electrical circuit The following connection steps should be carried out with the power cable disconnected from the set a Check whether the battery is of 12 volts b Locate the positive and negative terminals of the battery is red and is black Should it be necessary to lengthen the power cable please use the same or a superior type of cable c It is necessary to connect your CB to a permanent and We advise you to connect the power cable directly to the battery as the connection of the CB cable to the wiring of the car radio or other parts of the electrical circuit may in some cases increase the possibilities of interference d Connect the red wire to the positive terminal of the battery and the black wire to the negative terminal of the battery e Connect the power cable to your CB radio WARNING Never replace the original fuse 10A by one of a different value Towards starter Connected to chasis gt 4 BASIC OPERATIONS TO BE CARRIED OUT BEFORE USING YOUR SET FOR THE FIRST TIME without transmitting or using the lt lt Push To Talk gt gt switch on the microphone a Connect the microphone b Check the antenna connections c Turn the set on by turning the volume knob clockwise d Turn the squelch knob to minimum e Adjust the volume to a comfortable level f Go to channel 20 D band by using either the UP or DN key on the microphone or the
22. value Repeat this operation to switch ON OFF the function FUNC SWR When pressing this key TOT ON or TOT OFF would display on the LCD for 2 seconds Repeat this operation to switch ON OFF the function When ON appears on the LCD users can press PTT to transmit Then the radio would time the transmitting duration Once the duration is beyond the set TOT time programmable the radio would emit voice prompt and stop transmitting and back to receiving state automatically This function aims to protect the radio against power tube damage from superheating caused by long transmission 22 EMG OR S RF EMG realizes Emergency Channel Call When emergent situation happens the radio would switch to the channel set in advance to communicate immediately Then the EMG icon would display on the LCD Press EMG key again to return to previous channel FUNC S RF S RF is SRF indicating switch of TX OR RX When this function is enabled SRF icon would display on the LCD Repeat the this operation to switch ON OFF the function lt REAR PANEL gt 23 POWER Accept13 8V DC power cable with built in fuse 10 Amp to be connected 24 EXT SP or PA SP EXT SP Accept 4 to 8 ohm 4 watt external speaker to be connected When external speaker is connected to this jack the built in speaker is automatically disconnected PA SP It is used to connect a PA speaker Before operating PA you must firstly connect a PA
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