Kenwood AT-200 user manual
Contents
1. Figure 8 Switch Positions for RF Power Measuring How to Use Your Antenna Coupler Correctly The antenna coupler may be a very useful addi tion to your station if it is sued properly There are some instances where an antenna coupler is not needed A typical SWR curve of a multi band yagi is shown in Figure 10 You should note that the SWR may change depending on the antenna height and surrounding environment such as trees and buildings The curve shows that you do not need to use the antenna coupler in the 14 18 to 14 30 MHz range as the SWR is below 1 5 1 if the antenna coupler is used the 0 3 db insertion loss will be greater than the im proved power transfer obtained by using the antenna coupler However the antenna coupler will be effective on the CW band The antenna coupler may be switched in or out by putting the ANT switch in the THROUGH or MATCHING ranges HOW TO USE WIRE ANTENNA CORRECTLY Your AT 200 has a connector provided specifi cally for a wire antenna so that you can enjoy communication with use of a simple antenna Good grounding of your AT 200 is required for use with the wire antenna For easy grounding work use a metal ground rod specifically avail able on the market For more simple work a water faucet can be utilized However attention should be taken in that many recent water pipes are made of polyvinyl instead of metal WARNING Never use gas pipe in any way as it is dangerous 1 6 2mm2. COPPER WIRE d SOLDER MORE THAN tm MORE THAN im 30cm x 50cm COPPER BOARD Figure 10 Ground Example De tH ARI IH S ECT l ON 4 mmu CIRCUIT DESCRIPTION ODEON HI LV HEIDE 1I d n gi Figure 11 is a block diagram for your AT 200 DIRECTIONAL COUPLER Figure 11 AT 200 Block Diagram Directional Coupler The directional coupler separates and samples the forward and reflected power from the coaxial cable connected from the transceiver to the load The directional coupler used in your AT 200 provides flat frequency response in all ranges of operating bands by using a toroidal core Therefore you do not need a calibration table Meter Circuit The forward and reflected signal taken out of the directional coupler are used for power and SWR measurements In the power measurement the meter can read either forward or reflected power on the respective scales as selected with the 200 W 20W switch In the SWR measurement on the other hand the forward power is calibrated with the CAL control so that the meter reads the re flected power as SWR Antenna Selector The antenna selector is very useful as it can con nect one of the three antennas or dummy load by a single switch depending on a particular purpose of communication Antenna Coupler The new antenna coupler is a universal matching type that is capable of matching 10 2 to 500 loads to the 502 input impedance The advantages are a low insertion loss real
3. ANTENNA TUNER Model AT 200 Downloaded by Amateur Radio Directory www hamdirectory info OPERATING MANUAL FEATURES 1 Your AT 200 is an antenna tuner designed for use with the Kenwood TS 520 and TS 820 series Your AT 200 consists of an antenna coupler a through line RF wattmeter an SWR meter and an antenna switch Your AT 200 is designed to be used on the amateur bands between 1 8MHz and 30MHz The RF wattmeter has two ranges 20W and 200W gnc anes Eten ann THEE EE We are happy you have chosen the Model AT 200 for your antenna tuning needs The AT 200 has been designed with the quality and performance that makes Kenwood The pacesetter in amateur radio UHR HHI TLLA EIH AID AU II EHI HP HM HP P Ret TI 4999 VP MI umean 5 The antenna switch has four outputs Two of these are for coaxial fed antennas one is for a wire antenna and one is for connecting a dummy load 8 The antenna matching circuit is effective in reducing TVI as it acts as a band pass filter 7 Your AT 200 is also capable of matching your transceiver with a wire antenna such as an inverted L Therefore it is possible to enjoy communication on the lower frequency bands CONTENTS AT 200 SPECIFICATIONS siente otini iake e rh nne 3 SECTION 1 TO PREPARE YOUR UNIT FOR USE 4 SECTION 2 CONTROLS AND WHAT THEY DO 5 SECTION 3 OPERATION 0 000 ee eee eee eee I eee 7
4. NT switch to the position of the antenna to be matched c Turn the FWD REF switch to the REF position d Now you will measure the reflected wave power Adjust the R TUNE and X TUNE con trols saternately until the meter swing is minimum Reflected wave power will be close to zero as matching is well You may tune again the transceiver if the meter swing does not correspond the mini mum REF with the maximum FWD on 28MHz band anly Table 1 shows the knobs positions for coupler adjustment SHOW THE MINIMUM SWING BY RAND X TUNE REF POSITION Us vm Er Figure 7 Adjusting the Coupled Table 1 Knob Positions of R X Tune at 50 TTE MHz R TUNE X TUNE 1 80 41 4 0 3 80 48 5 7 730 6 5 6 9 14 20 74 7 8 21 20 8 2 83 28 50 EY 8 6 Remarks Those values are approximately Measuring the SWR when using coupler After completion of coupler adjustment you will measure matching state of the transmitter and antenna in a similar manner to that of the Measuring the antenna system SWR Measuring the Transmit Power Set the switches as shown in Figure 8 You will measure the forward wave power with the FWD REF switch in the FWD position Also measure the reflected wave power with it in the REF position NOTE If SWR is too high note that the measured power is in error SET UP AT FWD OR REF T 200 FWD POWER CAL CAL O2 20W REF Lswa t POSITION AS TRANSMITTING POWER A
5. OD ANTENNA TUNER AT 200 1 Meter The meter reads SWR standing wave radio transmit power on the 20W and 200W scales that are changed with the 200W 20W switch 2 Wattmeter Range Selector Switch This switch selects the Wattmeter full scale 20W or 200W Set the switch to the 200W position for 100W transceivers 3 FWD REF Forward Reflected Wave Selector Switch Setting the FWD REF switch allows the Watt meter to read either forward power or reflected power The effective radiated power can be known by subtracting the reflected power from the forward power 4 POWER SWR Wattmeter SWR Selector Switch The POWER SWR switch sets the meter to watt meter in the POWER position and to SWR meter in the SWR position 5 CAL Calibrate Switch For measuring SWR this CAL switch is set to the CAL position and the CAL control is ad justed until the meter pointer swings to the CAL position on the meter By throwing the CAL Switch to the SWR position then you may read the SWR directly 6 CAL Calibrate Control In measuring SWR CAL control is used to calib rate the meter The control can be adjusted in the manner described above 7 ANT Antenna Selector Switch Your AT 200 can connect three antennas and a dummy load as the loads to the transmitter The ANT switch also has a THROUGH position at which a given antenna can be directly connected to the transceiver At the THROUGH position your AT 200 also can mea
6. SECTION 4 CIRCUIT DESCRIPTION 0000s eee eee eee 9 SECTION 5 ADJUSTMENT AND MAINTENANCE 10 SCHEMATIC DIAGRAM lsllseeeee n t 11 41D CLP CHLEIT EID UI e D TDI II UE HELD LP TP I D EID HD UL AT 200 SPECIFICATIONS Mese PTR CU eee EIN ER DO e LR e EH 00 Downloaded by Amateur Radio Directory www hamdirectory info 1 Antenna Coupler Frequency range Input impedance Antenna impedance Through power Insertion loss PL Output impedance Through power 2 Wattmeter Type Frequency range Measurable RF power Impedance Accuracy 3 SWR Meter SWR detection Measurable range Min power required 4 General Connectors INPUT Connectors ANT 1 ANT 2 ANT 3 GND Dimensions Net weight 6 amateur bands from 1 8 to 29 7 MHz 502 10 to 5002 unbalanced 200W at max Less than 0 5dB in well matching state 1 8 MHz only 20 to 500 2 unbalanced 100 W at max Through line wattmeter 1 8 to 30 MHz Up to 20 200W switched Forward power and reflected power switched 502 Better than 10 of full scale Toroidal core direction coupler 1 1 to 10 4W UHF type 50 2 UHF type UHF type Wire antenna only 166 6 17 32 W x 153 6 H x 190 7 1 2 mm 2 8 kg 6 2 Ibs approx PEURAN UO ON HS CEDAR LL ER D ADTA TD E UD TP HU EVO LL l0 SECTION 2 CONTROLS AND WHAT THEY DO IY HIPH D 4I LP a0 g p MATCHING KENWO
7. illustrated in Figure SWR position Now you will read SWR If 5 A SWR is lower then 1 5 the antenna system is Adjusting the transceiver matched well for practical use f not you a Set the ANT switch to the DUM position as should tune it shown in Figure 5 B NOTE In event of too high SWR over 10 b Adjust the transceiver for the maximum out check the antenna system for break put at your transmit frequency or shortcircuit CAUTION After set up do not tune the transmitter controls unless chang ing the transmit band and fre quency largely o Measuring the antenna system SWR CAL CONTROL ADJUSTS TO Before setting up the antenna coupler you MAXIMUM should know of the SWR of the antenna system SWING a Set the controls as illustrated in Figure 6 Set tw w3 Powca CAL HE the ANT switch to the THROUGH position O m to which a desired antenna is connected X RE Lawn b In the transmit mode adjust CAL control so K that the meter may be to the maximum swing Figure 6 Setting for SWR Measurement A TS 5208 TO ANTENNA DUMMY LOAD sow DUMMY LOAD rious ANT m is Dantas L POTERE 2 5 ANT yy S ANT 241 8 DUMMY OPERATIN POSITION BAND N Figure 5 Connection and Switch Positions Adjusting the antenna coupler The antenna coupler is used to insert and match given antenna system if its SWR is too high a Set the BAND switch to an operating band position as shown in Figure 7 b Set the A
8. ized with the use of a low loss toroidal core and great harmonic attenuation that is effective in reducing TVI and similar radio interference DUST en D I D SCHEMATIC DIAGRAM TTT ET TT TEE ID 82D LB t D I ui The circuit elements may be changed without notice owing to technical innovation Downloaded by Amateur Radio Directory www hamdirectory info z a gt z E 9 FA go 5 E 5 m p z 4 hi zo zo re i ae MATCHING E THROUGH ANT SELECTOR 12 DUMMY ANTI 2 ANT2 3 ANT3 4 ANTI 5 ANT2 6 ANT3 AT 200 11
9. sure the output power and SWR 8 BAND Switch This BAND switch is to be set to a position of the 1 9 to 28 MHz bands according to the operating band 9 R TUNE The R TUNE adjusts the resistance component of the antenna 10 X TUNE Transmit Tuning Control The X TUNE adjusts the reactance component of the antenna Figure 4 Rear Panel Views 1 INPUT Connector The INPUT connector inputs the HF signal fed from the antenna connector on the transceiver 2 DUMMY Connector The DUMMY connector connects a dummy load used for adjusting the transceiver Note that the connector is not fed through the antenna coupler 3 ANT 1 and ANT 2 Connector The ANT 1 and ANT 2 UHF type connectors is plugged with the antenna coaxial cable 4 ANT 3 Connector The ANT 3 connector is plugged with a wire type antenna for typical example an inverted L antenna Whenever connecting such an antenna ground the GND post with wire as short as possible 5 GND post The GND post is to be grounded whenever a wire type antenna is used 6 Serial No Plate This plate is stamped with the Serial Number of your AT 200 OEDIPUS E LID LUUD LETS EL ID R CALE UD IP LT TID EE D D EE C D ED D A HUI SECTION 3 OPERATION UE UU EM IUD UL ED 4L E 402 130 UIDI DAOUD ANOTADA UD HUS OLEO ED TEL LUI HD 4E f EI DD OUT Interconnect your AT 200 with the transceiver c In turn turn the CAL SWR switch to the antenna and dummy load as
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