Sommerkamp TS-340 user manual
Contents
1. 1K ohm 5 PARROT 76 MUTING SW LED ON OFF i i SP MIC P TOUCH SW 2 TONE CALL UNIT a3 10 n a 97 PON 12V AND RESET 4 PIT 1 12 Mo a CODE SELECTOR SW Downloaded by RadioAmateur EU2. 7 RECEIVER Set the Mode Switch to AM Volume Control at maximum Squelch at minimum Clarifier in the center and the CB PA Switch to CB Set the SSG on Channel 19 and Channel Selector of the unit on Channel 19 Then connect the Power Supply and 8 ohms Dummy Load to the transceiver unit Feed the signal from the SSG and set the audio output for a peak reading by adjusting T 1 T 2 T 3 and 4 In this case be sure that antenna input should be less than 14 V at the AF standard output power Also make sure that the audio on the oscilloscope is a sine wave Set the antenna input at 1u V so that the antenna power may be more than 0 5 watt at the maximum volume cf all channels Set the antenna input at 1 0004 V so that the output power should be more than 3 0 watts at the maximum volume Set the antenna input to 50 0004 V and the low frequency output to 0 5 watt by volume con trol Then decrease the antenna input until the low frequency output stays 10 dB lower Be sure that the antenna input then should be less than bu V Set the antenna input to 1004 and the meter indication to 9 by VR 2 Set the volume control and squelch control at maximum and set the tight squelch by VR3 so that the output from speaker is heard when the antenna input is increased upto 1 0004 V Set the antenna input to O 7u V and be sure that the low frequency output should be over 10 dB more when the modulation of the SSG is turned off at the norm
3. ERMA odel TS 340 OWNER S MANUAL 40 CHANNEL MOBILE AM SSB IZENS BAND TRANSCEIVER Hn a a E EH EEEE EEEE TTI Tiron meet Downloaded by RadioAmateur EU GENERAL Your new Sommerkamp TS 340 is a professional quality Citizens Band Transceiver designed to operate on either AM Lower Single Sideband LSB or Upper Single Sideband USB It has many innovative engineering and user functions Among them a Sommerkamp plus feature is an amplified AGC circuit built in to your TS 340 This expands the range of a normal AGC circuit by many times and is usually found only in the most expensive sets Your amplified AGC will enable you to hear clearly even a very weak distant signal and still allow you to hear a unit close by with out overload The PLL phase lock loop frequency synthesizer is the heart of the S 340 s rock steady frequency control The PLL is self compensating for frequency drift keeping your TS 340 on center channel every channel Careful reading of this instruction manual before operation is essential for proper operation and prevention of damage PACKING This unit has been especially protected for shipment Open the carton carefully to avoid damage Examine the unit for any visible damage If the transceiver has been damaged in shipment save the box and packing material and notify the transportation company RECEIVER Sensitivity of less than a 1 2 of a microvolt on SSB and
4. long wire or other CB antenna standard SO 239 type connector is provided on the back panel for use with popular PL 259 antenna plug ANTENNA INSTALLATION When the TS 340 is used as a base station any Citizens Band beam dipole ground plane or vertical antenna may be used ground plane type will provide greater coverage and since it is essentially non directional it is ideal in base station to mobile operation From base station to base station or point to point operation a directional beam will give greater distance even under the adverse conditions MOBILE ANTENNAS A vertical whip antenna is best suited for mobile use A non directional antenna must be used for best results in any case The base loaded whip antenna will normally provide effective communication For greater range and more reliable operation a full quarter wave whip may be used Either of these antennas use the metal car body as a ground plane and the shield of the base lead as well as the metal case of the transceiver should be grounded standard antenna connector type SO 239 is provided on the transceiver for easy connection to a standard PL 259 cable termination MOBILE INSTALLATION A location in the car or truck should be chosen carefully for convenience of operation and non interference with normal driving functions Mounting may be under the dash or instrument panel or any place a secure installation can be made An easy release mounting bracket
5. reverse voltage appears let s say it s 2 The meter circuit now sees 20 and shows a higher reading You can see that because of the way most RF output meters work the LOWER your RF output meter reads the better your antenna is tuned Of course if the meter reads less than 1 2 scale it may indicate a problem in your set and should be checked Similarly an extremely high reading may indicate a problem in your antenna An RF output meter can tell you much especially if you know how to use it TUNING YOUR ANTENNA WITH AN SWR METER Using an SWR meter is the most accurate way to tune an antenna Connect the SWR meter as close as possible to the back of the transceiver Use double male connector or a very short piece of RG58 U with connectors on each end Place the adjustable whip halfway into its receptacle Set your transceiver to Channel 20 Measure the SWR following instructions supplied with the meter After the first measurement move the whip down 1 8 to 1 4 inch and repeat ALL the steps again If the SWR is lower continue the process moving the whip down 1 8 to 1 4 inch at a time until the lowest reading is obtained If the SWR is higher raise the whip 1 4 to 1 2 inch the first time and 1 8 to 1 4 inch thereafter until the lowest SWR is obtained Note if the reading continues falling but you have reached farthese point down that you can go with the whip the whip may be too long To verify this put the Channel Dial to Channel 1
6. when operating at close proximities to other strong signals it may be helpful to reduce the RF Gain to avoid overload or distortion or interference from adjacent channels MODE SWITCH FOR LSB USB AM AM transmission is amplitude modulation of the radio frequency carrier with an audio signal voice The components of the transmitted signal include the carrier and its two sidebands upper and lower For 10096 modulation each sideband contains one fourth as much power as the carrier The information transmitted is in the sidebands USB transmission is the transmission of the upper sideband only of a single sideband signal In single sideband transmission the carrier and one sideband are removed from the transmitted signal Thus only one sideband is transmitted LSB transmission is the transmission of the lower sideband only Rotate the mode selector switch to the desired mode MODE FUNCTION LIGHT The TS 340 has a dynamic 3 way mode function light In the upper sideband mode the light will be green The lower sideband mode will show red The AM mode will show both red and green CLARIFIER The clarifier is an electronic tuning circuit which allows you to shift the frequency of your receiver plus or minus 1 5 kHz 3 kHz total In SSB operation even small differences in frequencies between stations can cause poor reception In effect the clarifier electrically fine tunes the station being received In AM operation this acts as a fine tu
7. AM A tuned RF stage pulls in even the weakest signals A deluxe filter on SSB provides the highest degree of selectivity and rejection of unwanted adjacent channel signals Ceramic Filters for AM reception deliver over 70 db adjacent channel rejection Additional receiver features include variable squelch clarifier control integrated circuit audio preamplifier stage metering automatic noise eliminator PA CB switch TRANSMITTER High efficiency is obtained through use of select components and sophisticated engineering design An ALC circuit is employed in the SSB mode to provide maximum Talk Power without distortion The SSB signal is generated by use of an integrated circuit balanced modulator and PLL synthesizer to keep you on center channel every channel Electronic switching is employed for dependability POWER SUPPLY Either Positive or Negative ground 12 Volts DC 13 8 VDC EIA is built in GENERAL Your new Sommerkamp TS 340 is a professional quality Citizens Band Transceiver designed to operate on either AM Lower Single Sideband LSB or Upper Single Sideband USB It has many innovative engineering and user functions Among them a Sommerkamp plus feature is an amplified AGC circuit built in to your TS 340 This expands the range of a normal AGC circuit by many times and is usually found only in the most expensive sets Your amplified AGC will enable you to hear clearly even a very weak distant signal and still allow y
8. IS DEPRESSED ON SSB HOWEVER IT WILL ONLY INDICATE RF OUTPUT POWER WHEN YOU MODULATE THE SIGNAL 2 IN THE SSB MODE NO METER CAN FOLLOW THE RAPID VOICE PEAK POWER ATTAINED THEREFORE WHILE THE TRANSMITTER IS DEVELOPING MUCH MORE POWER THAN ON AM THIS ADDITIONAL POWER WILL NOT BE FULLY REFLECTED ON THE METER MODULATION RF METER SWITCH Allows either relative RF Radio frequency output or modulation output to be monitored while transmitting NB ANL NOISE BLANKER AUTOMATIC NOISE LIMITER SWITCH The TS 340 is eguipped with both noise blanker and ANL circuits for maximum noise suppression and clear reception DC CONNECTOR This connector is used to supply power to your TS 340 The plug in feature allows easy removal for security purposes or for moving the transceiver to another vehicle PA SPEAKER JACK For attaching optional 8 16 ohm external speaker Simply plug your accessory speaker into the jack EXTERNAL SPEAKER JACK You may add any 8 16 ohm external speaker Simply plug your accessory speaker into the jack NOTE INSERTING THE 3 5MM PLUG WILL AUTOMATICALLY DISCONNECT THE IN TERNAL SPEAKER ANTENNA CONNECTOR A standard SO 239 type connector is supplied for attaching either mobile or base antennas MICROPHONE The receiver and transmitter are controlled by the press to talk switch on the microphone To transmit simply press in this switch Release the switch to receive When transmitting hold the microphone 3
9. is supplied and additional perforated straps or brackets may be used as desired The 12 Volt cable may be connected to any convenient terminal but preferably to the ignition switch to prevent unauthorized persons from operation of your unit With this method the unit will only operate when your key is turned on Engine ignition interference should not be a problem and vehicles equipped with standard broadcast radios should have enough suppression to eliminate ignition interference If interference is present any skilled auto radio repairman should be able to eliminate it for you BASE STATION OPERATION For base station use a suitable regulated 2 5 AMP power supply is recommended When a power supply is used simply connect the red and black terminals on the power supply of the and leads on your TS 340 MOUNTING INSTRUCTIONS WASHER x5 MOUNTING BRACKET TAPPING SCREW x5 WING BOLT x4 Downloaded by RadioAmateur EU 9 GENERAL OPERATING INSTRUCTIONS CAUTION NEVER OPERATE THIS UNIT WITHOUT AN ADEQUATE ANTENNA SYSTEM OR NOOR WN KO LOAD ANTENNA SWR SHOULD NOT EXCEED 3 1 FAILURE TO FOLLOW THESE RECOMENDATIONS COULD RESULT IN DAMAGE TO THE RE OUTPUT TRAN SISTOR Make sure the proper connections have been made for antenna system power cable and microphone _ Set the PA CB Switch to the CB Position Set the Squelch Control fully counterclockwise Set the RF Gain fully clockwise Set
10. the Mic Gain fully clockwise Set the Mode Switch to the desired mode Rotate the Volume Control clockwise You will hear an audible click and the meter and channel lights will come on Continue rotating clockwise to desired listening level With no signal present rotate the Squelch Control clockwise until the rushing noise disappears Set the Channel Selector to the desired channel To Transmit simply press and hold the push to talk bar on the microphone a few inches from your mouth and speak in a normal tone of voice PA OPERATION Attach an optional paging speaker equivalent to the PA jack on the back of the unit Put the PA CB switch to the PA position To activate circuit simply depress the push to talk switch on the microphone In some cases feedback may occur if there is not enough seperation between the microphone and paging speaker Place the microphone so it is 180 degrees from the speaker If this does not solve the problem you may have to move the speaker farther away SPECIFICATIONS GENERAL 1 2 3 4 10 Semiconductors Frequency Range Modes of Operation Controls Connectors and Jacks Speaker Microphone Power Supply Dimensions Weight RECEIVER d nd dd ud dm 9 10 Sensitivity at S N 10dB Selectivity AGC Figure of Range oquelch Range Audio Output Power Distortion at input 100uV Audio Frequency Response oupurious Response IF Frequency Current Drain no a
11. to 4 inches from your mouth and speak clearly at normal voice levels The TS 340 uses a newly designed high level output microphone It delivers maximum talk power 6 NEGATIVE POSITIVE GROUNDING Almost all cars and most trucks are negative ground There are some large trucks and construction equipment which operate on positive ground Your Sommerkamp TS 340 will operate on either In the negative ground systems the minus pole of the battery is attached to the car body engine block etc NEGATIVE GROUND HOOKUP Attach the red fused wire to the fuse block terminal or any convenient plus lead Devices operated by the ignition key such as the radio light etc are best since when you turn the ignition off the unit will be turned off Attach the black lead to the car body via any convenient method NOTE MANY NEWER CARS USE PLASTIC DASH PIECES MAKE SURE THE SCREW OR CONTACT YOU CHOOSE IS ATTACHED TO THE METAL FRAMEWORK OF THE CAR POSITIVE GROUND HOOKUP In the event that you do have a positive ground vehicle the following hookup must be made Attach the red fused lead to the car body via any convenient screw bolt etc Attach the black lead to the terminal block or any convenient wire which goes to the minus pole of the battery FAILURE TO MAKE THE PROPER CONNECTION COULD RESULT IN UNIT DAMAGE ANTENNA REQUIREMENT This transceiver will operate with any standard 52 ohm ground plane vertical mobile whip
12. to do its job properly b TIGHTEN YOUR PL 259 CONNECTOR OCCASIONALLY road vibration has a tendency to loosen it which can cause output transistor problems 6 PERIODICALY every 6 months re check your SWR Corrosion and road grime may rob you of performance 7 PERIODICALLY check your coax cable for wear A broken or loose wire could cause RF output transistor failure This information was produced to help you understand the installation and maintenance of your antenna and cable feed system Many field problems have been traced to problems such as the above They can lead to eventual failure of the RF output transistor in your transceiver Careful installation and maintenance can prevent these problems ACCESSORY JACK The 7 pin DIN standard accessory jack has the following connections 1 Internal speaker Z 8 Ohm 2 Audio detector output 3 Audio output Z 8 Ohm 32 Ohm 4 Microphone input Z 600 10 K Ohm 5 External Vol Control 6 12 Volt 7 transmit receive switching Case ground Always operate the transceiver with the shortening plug inserted in the accessory jack or with the following external connections Headset or Telephoneset with PTT 32 10K ohm O Speaker O3 10 4 V j 60 a T G 600 10K ohm s Microphone 2 External microphone 3 Headset or Telephoneset with VOX 32 LOK ohm Speaker O5 244 53 19 Voice Control 07 60 Microphone T 600 10K ohm Speaker
13. MIC GAIN CONTROL This control allows you to adjust microphone sensitivity or power to compensate for different operating situations Maximum microphone sensitivity or different operating situations Maximum microphone sensitivity or power is obtained at the full clockwise position and the control should be set to this point for normal operation and maximum range Examples of how this control can help to maximize communications effectiveness are as follows When you are operating at extremely close proximity within 100 yards or meters of the other station reducing the microphone gain may help to eliminate overload and distortion at the other station When you are operating in an extremely noisy environment such as may be found in the cab of certain large trucks open sports cars or around noisy machinery in order to avoid or reduce the amount of noise that goes out with your signal you can reduce the microphone gain and by speaking more closely and loudly into the microphone reduce the ratio of noise to voice RF GAIN CONTROL This control allows you to adjust the basic sensitivity of the receiver section of the transceiver It is somewhat like the microphone gain control in that it allows you to compensate for different or varying operating conditions Maximum RF Gain or receiver sensitivity is obtained at the maximum clockwise position of this control and the control should be set to this point for normal operation and maximum range For example
14. al output Set the Mode Switch to USB Volume Control at maximum Squelch at minimum and Clarifier in the center Tune off the modulation of the SSG and remove the frequency by 1 KHz Make sure that the maximum sensitivity should be less than 1u V Make sure of AGC like with AM Set the antenna input to O 2u V and keep the AF output to be over 10 dB lower when the antenna input is turned off at the normal output TRANSMITTER Connection of test equipment Power supply at 13 8 VDC Connect a Power meter oscilloscope frequency counter spectrum analyzer and P P RF volt meter to the RF output connector Connect an AF oscillator and AF volt meter to the microphone connector Power adjustment Set the mode switch to AM Adjust T 5 8 9 1 12 and L 3 for the maximum point Adjust L 4 for 3 6W output Adjust L 2 to increase 2nd harmonic Frequency Make sure every channel stays within X800Hz Modulation Limiter Adjustment Putin 1KHz and 20mV signal from AF oscillator and adjust VR7 for 90 modulation Modulation capability Put 1kHz signal by AF oscillator and get 90 modulation for the minus side The plus side should be over 80 SSB Set the mode switch to USB Put in two tone signal of 1KHz and 1 6KHz by two AF oscillators ALC alignment Adjust the two tone signal of AF oscillator for W RF power output Adjust VR 11 for 11 W PEP RF power output when the two tone signal is incr
15. and measure the SWH Next put the channel dial to Channel 40 and measure the SWR IF THE SWR WAS LOWEST ON CHANNEL 1 AND HIGHEST ON 40 THE WHIP SECTION IS TOO LONG Carefully cut 1 4 to 3 8 inch from the whip section and re measure Channels 1 20 and 40 If the SWR is still lowest on Channel 1 continue trimming the whip by removing 1 8 to 1 4 inch at a time until the lowest SWR is obtained on Channel 20 DO NOT GET OVERANXIOUS YOU CANNOT REPLACE A SECTION ONCE IT 1 CUT OFF you exceed slightly the best tuning for Channel 20 the whip may be raised 1 8 to 1 4 inch at a time to obtain the best SWR on Channel 20 WARNING DO NOT CUT THE WHIP USING THE POWER OUTPUT METER TUNING METHOD YOU MUST USE AN SWR METER TO ACCURATELY DETERMINE THE SWR Every six months or so re check the SWR Car washes rod grime and chemicals can effect the mechanical connections of an antenna and corrode them This corrosion can cause poor electircal connections and lead to high SWR The correction of this problem is usually accomplished by cleaning of the metal connection parts with a wire brush HELPFUL HINTS 1 High SWR robs you of range and puts a strain on your output transistor ALWAYS TUNE A NEW ANTENNA 2 Never tune your antenna in a closed area garage under a metal car port etc as incorrect tuning may result 3 MAKE SURE ALL MECHANICAL CONNECTIONS ARE TIGHT 4 DON T SMASH OR SHARPLY BEND THE COAX CALBE it should remain generally round
16. ble to borrow one the RF output meter on your transceiver can be used as a GUIDE to antenna turning While it is not 100 accurate it is generally better than no tuning at all Always tune your antenna in an open area Wires metal and copper tubing if nearby can effect the tuning Never tune an antenna inside a garage under a metal car port next to a metal truck etc A USING YOUR TRANSCEIVER OUTPUT METER AS A TUNING GUIDE After installing your antenna system place the whip halfway into its receptacle and turn your transceiver to Channel 20 Depress the switch on your transceiver microphone and make note of the reading on your RF output meter Loosen the adjustable whip section and move it 1 8 to 1 4 inch down Again depress the transmit switch if the reading is the same or lower continue moving the whip down 1 4 inch at a time until the LOWEST reading is obtained on your transceiver RF meter If the reading was higher move the whip 1 4 to 1 2 inch the first time and 1 8 to 1 4 inch thereafter until the LOWEST reading is obtained on the RF meter That s right THE LOWEST READING Your RF output meter is a voltage sensing device It is installed in the RF output circuit and senses the voltage near the antenna terminal In a perfectly tuned system all of the voltage is transferred from the output transistor and passed to the antenna As example let s use the figure 10 If there is SWR on the line the forward voltage is 10 and a
17. eased by 20 dB Carrier suppression Cut off the two tone signal and make sure the output level of the carrier is below 40 dB Set the mode switch to LSB and do the same YOU AND YOUR ANTENNA Three main components comprise a typical Citizensband installation They are your transceiver an antenna and the coaxial cable which connects the antenna to the transceiver It is important that all three pieces are installed correctly to give the best possible range and reliable performance We hope this pamphlet will be helpful for you to realize the maximum performance of your installation ANTENNA For several reasons it is impossible to exactly PRE TUNE an antenna at the factory A general range of tuning is done which may suffice but for best performance an antenna should be turned after it is installed Most antennas have some form of tuning capability Usually this involves the whip section sliding into a coil spring or metal section This allows the antenna to be adjusted to the exact frequency desired We cannot stress enough the importance of tuning your antenna The measure of an antenna s performance is its SWR standing wave ratio COAX CABLE Coax cable is used in all Citizensband installations This cable transfers the power from your transceiver to the antenna The output of your transceiver is 50 52 ohms Your antenna is designed to 50 52 ohms For this reason RG58 U or RG8 U cable is used because i
18. enter channel every channel Electronic switching is employed for dependability POWER SUPPLY Either Positive or Negative ground 12 Volts DC 13 8 VDC EIA is built in FEATURES AND CONTROLS VOLUME POWER ON OFF This combination control applies power to your S 340 and adjusts the receiver volume The switch should be turned clockwise from the Off position You will hear an audible ciick The channel LED and meter will light adjust the volume continue advancing the control in clockwise position VOL U MIKE This auxiliary volume control is an extension of the regular front panel receiver volume control It offers great operating convenience by giving you instant volume adjustment right at your fingertips while you are driving As this is an extension control the regular front panel volume must be advanced in order for the Vol U Mike to operate SQUELCH CONTROL The squelch control is used to eliminate background noise when there are no signals present strong enough to overcome the noise To adjust the squelch control select a channel where there is no signal Turn the volume up to normal listening levels Rotate the squelch control clockwise until the background noise disappears CHANNEL SELECTOR The channel selector switch is used to select the channel frequency It automatically adjusts both the transmitter and receiver frequencies and displays your selection in bold L E D Light Emitting Diodes numerals
19. ning circuit TX INDICATOR Your TS 340 is equipped with a LED light emitting diode transmit indicator light on the front panel With the PTT switch on the mike depressed the LED will light indicating you are in the transmit mode PA CB SWITCH In the PA position your TS 340 is converted to a public address amplifier or hailer The PA function should not be used unless an 8 16 ohm external speaker is connected to the jack located on the back of the chasis Once this optional speaker has been connected simply put the PA CB switch to the position and depress the microphone push to talk switch NOTE THE VOLUME CONTROL ADJUSTS PA OUTPUT LEVEL S RF CAL SWR METER FUNCTION SWITCH AND CALIBRATION NOTE THE TRANSCEIVER MUST BE IN THE AM MODE FOR THE SWR FUNCTION TO BE USED In the bottom position of the 3 position selector switch the meter operates normally as signal in RF output meter the center and top positions of this switch the SWR standing wave radio funcitons are activated To measure SWR select an open or little used channel as close as possible to the center of the range of channels you plan to operate on If you plan to operate on all channels 1 through 40 you should select a channel between 17 and 23 1 Set the function switch to Cal calibrate 2 Press the microphone push to talk bar and adjust the front panel calibration control so the meter pointer is at the SWR set position which i
20. ou to hear a unit close by with out overload The PLL phase lock loop frequency synthesizer is the heart of the S 340 s rock steady frequency control The PLL is self compensating for frequency drift keeping your TS 340 on center channel every channel Careful reading of this instruction manual before operation is essential for proper operation and prevention of damage PACKING This unit has been especially protected for shipment Open the carton carefully to avoid damage Examine the unit for any visible damage If the transceiver has been damaged in shipment save the box and packing material and notify the transportation company RECEIVER Sensitivity of less than a 1 2 of a microvolt on SSB and AM A tuned RF stage pulls in even the weakest signals A deluxe filter on SSB provides the highest degree of selectivity and rejection of unwanted adjacent channel signals Ceramic Filters for AM reception deliver over 70 db adjacent channel rejection Additional receiver features include variable squelch clarifier control integrated circuit audio preamplifier stage metering automatic noise eliminator PA CB switch TRANSMITTER High efficiency is obtained through use of select components and sophisticated engineering design An ALC circuit is employed in the SSB mode to provide maximum Talk Power without distortion The SSB signal is generated by use of an integrated circuit balanced modulator and PLL synthesizer to keep you on c
21. s the small red block at the right side of second meter scale from the bottom Release the press to talk bar 3 Set the function switch to the top SWR position 4 Press the microphone push to talk and read the SWR measurement on the bottom meter scale The SWR scale is calibrated at 1 1 5 2 and 3 If the meter pointer stops at 2 for example it would be correct to say that the SWR is 2 to 1 For a more complete understanding of SWR and how to reduce it refer to the section appearing later in this manual titled Understanding SWR CHANNEL 9 PRIORITY SWITCH This switch provides instant channel change to emergency Channel 9 without having to rotate the channel selector NOTE MOST CHANNEL 9 EMERGENCY MESSAGES ARE TRANSMITTED IN AM SO IF FOR EXAMPLE YOU ARE OPERATING ON EITHER UPPER OR LOWER SIDEBAND CHANNEL 16 AND YOU WANT TO TRANSMIT OR RECEIVE AN EMERGENCY MESSAGE ON CHANNEL 9 IT WILL BE ADVISABLE TO ROTATE THE MODE SELECTOR TO THE AM POSITION IN ADDITION TO PUSHING THE CHANNEL 9 PRIORITY SWITCH LED BRIGHT DIM SWITCH This switch allows the channel indicator brilliance to be set according to existing conditions S RF METER The TS 340 is equipped with a large easy to read combination meter In the receive position the meter reads the level of the incoming signals In the transmit position it indicates relative power output NOTE 1 IN THE AM MODE THE METER WILL READ POWER AT ALL TIMES WHEN THE TRANSMIT BUTTON
22. t also is 52 ohms and matches the antenna to the unit The frequency of the antenna is very important in this area because a mis tuned antenna can disrupt the system balance If this balance is disrupted standing waves are generated on the coaxial cable which results in a loss of power in your transceiver UNDERSTANDING SWR Standing Wave Ratio In theory your transceiver has 50 ohm output and your antenna is 50 ohms If a 50 ohm cable such as RG58 U or RG8 U is used all the power from your transceiver will be transmitted via the coaxial cable and radiated by the antenna Under these conditions the SWR standing wave ratio of your antenna system vould be 1 1 In practice the antenna must be 50 ohms and tuned to the exact channel This condition seldom exists and standing waves are set up on the cable This SWR robs you of power and likewise range While 1 1 is not always possible to attain you should tune your antenna system so the SWR does not exceed 1 5 to 1 or at maximum 2 to 1 Here are some examples of the power losses for various SWR ratios 13 SWR Power Losses 1 1 0 1 3 1 2 1 5 1 3 1 7 1 6 2 1 11 3 1 25 4 1 38 5 1 48 6 1 55 10 1 70 TUNING YOUR ANTENNA For optimum performance an SWR meter should be used to tune the antenna However since this meter may cost from 815 00 to 830 00 not everyone may want to invest in its purchase If possible borrow one If you are una
23. udio SSB TRANSMITTER 1 2 4 5 RF Output Power Carrier Suppression Unwanted Sideband Suppression Harmonic Suppression Current Drain TRANSMITTER AM P mm RF Output Power Modulation Capability Harmonic Suppression Current Drain 22 Transistors 2 FET 10 IC s 54 Diodes and LED 26 965MHZ 27 405MHZ AM Lower Sideband and Upper Sideband Volume Control with power on off switch Variable Squelch Control Mike Gain Control RF Gain Control SWR CAL Control Mode Selector Switches Clarifier Control Channel Selector Switch Noise Blanker ANL Switch Meter Select Switch CH 9 Priority Switch Bright Dim Switch CB PA Switch Microphone Connector Coaxial type Antenna Connector Public Address Speaker Jack External Speaker Jack DC Power Jack 3 1 2 inches 8 ohms Dynamic Microphone 500 Ohms 13 8VDC 8 W x 1 1 8 x 7 5 16 D 4 LBS 07 OZS AM 0 5uV SSB Q 2uV AM DKHZ SSB 2 2KHZ 80dB 0 5uV 1000uV 3 Watts 6 300 2200HZ More than 45dB supurious signal is required to produce the same amount of audio output as the desired receive signal 9 78b5MHZ 500 12 Watts PEP More than 40dB More than 50dB More than 60dB 850mA 4 Watts More than 80 More than 60dB 1800mA Downloaded by RadioAmateur EU ALIGNMENT INSTRUCTIONS 1 2 3 4 5 6 7 8 9 10 11 12 13 1 2 3 4 6
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