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Revision 171215

MR300 SWR Analyzer

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MR300 SWR Analyzer

User Manual

Revision 171215

This product is revised by SARK100, and the technology is from Melchor Varel(EA4FRB)

Содержание MR300 SWR

Страница 1: ...on 171215 0 MR300 SWR Analyzer www lxqqfy com lxqqfy foxmail com lxqqfy qq com MR300 SWRAnalyzer User Manual Revision 171215 This product is revised by SARK100 and the technology is from Melchor Varel EA4FRB ...

Страница 2: ...approx 5 to 2000 ohms RF Output o Adjustable 2 0 Volts pp typ Power supply o External 13 8 to 19 Volts DC 500mA Note 12V can be used but can not be used for recharged o Internal 8xAAA 1000mAh NiMH cells o Charging time 12 hours charge rate 0 1C Controls o Pushbuttons 5 Mode Band Config Scan Up Down o Switch Power On Connectors o RF Out M SL16 o USB Mini B receptacle o External power 2 1mm Power Ja...

Страница 3: ...ngth velocity factor approximate Q and loss resonant frequency and impedance o Measure and determine optimum settings for tuning stubs SWR approximate Q resonant frequency bandwidth impedance o Determine characteristic impedance of transmission line o Determine length of and wave phasing lines o Coaxial Cable Loss o Determine antenna tuner loss o Measure balun loss o Measure inductor Q o Estimate ...

Страница 4: ...Revision 171215 3 MR300 SWR Analyzer www lxqqfy com lxqqfy foxmail com lxqqfy qq com 2 Connections and Controls ...

Страница 5: ... is an energy saving feature but not a full power off i e the instrument continues to have a significant consumption so it is recommended shutting down completely in the case it s not going to be used User Interface The user interface consists of six buttons four aimed at selecting the functions available and two are used primarily to select the frequency but have the dual function of canceling an...

Страница 6: ...o a lower granular digit e g 10 kHz or 1 kHz in order to manually perform a detailed scan while watching displayed results for SWR impedance and reactance MODE Successively pressing the MODE button you can select one of the MR300 operating modes impedance magnitude complex impedance capacitance inductance and off Impedance Mode magnitude This is the main mode of the instrument and measures the SWR...

Страница 7: ... measurement range of the instrument Given that the maximum impedance specification for the analyzer is 2000 Ω the display will show a numeric value only when the reactance is less than this value The formula to calculate the capacity is the following XC 1 2 pi F C Inductance Mode This mode allows the measurement of the inductance An example screen is the following IND 14 100 000 L 7 8 uH The top ...

Страница 8: ...frequency value since this is stored when changing the band Band Lower Frequency Middle Frequency Upper Frequency 160M 1 000 000 1 800 000 2 000 000 80M 2 000 000 3 700 000 5 000 000 40M 5 000 000 7 100 000 8 000 000 30M 8 000 000 10 100 000 11 000 000 25M 11 000 000 12 000 000 13 000 000 20M 13 000 000 14 100 000 17 000 000 17M 17 000 000 18 100 000 19 000 000 15M 19 000 000 21 000 000 23 000 000...

Страница 9: ...cy value corresponding to the minimum SWR point BW 35 000 Press any key In the case of not finding a resonance point the unit will display the following error message on the screen Err No Matching Press any key CONFIG Successively pressing the CONFIG button you can select one of the MR300 configuration modes and extended funtions To select either option you need to press the button VAL and for exi...

Страница 10: ... value you need to press the button VAL and for exit you need pressing the button CAN The following values are available 10Hz 100Hz 1kHz 10kHz and 100kHz Suspend Timeout This feature allows you to program the user idle time for the automatic power save feature Successively pressing the CONFIG button you can select one of the idle time values To select either value you need to press the button VAL ...

Страница 11: ...cted to the antenna and then adjusted for best SWR on the analyzer 4 3 Measure Ground Losses With short vertical antennas measuring the impedance directly at the feedpoint allows estimation of ground loss or loading coil loss For example a wave vertical will have a resistance of about 36 ohms at resonance Any higher reading indicates ground loss Similarly shorter antennas when resonated will have ...

Страница 12: ...e several ways to measure inductance with the MR300 The simplest way is to connect the inductor across the RF output connector and select Inductance from the Mode pushbutton menu You can accurately measure inductor values as long as the reactance at the measurement frequency is within the impedance measurement specifications of the analyzer about 10 to 2000 Ω Another way to measure inductance with...

Страница 13: ...s Q The Inductor and Capacitor Measurement section of this manual shows how this capacitor value can be determined Now tune the Analyzer for the lowest R resistance value with a reading of zero X reactance If R is above 10 ohms you can now calculate inductor Q using the formula Q XL R If R is less than 10 Ω a slightly different method needs to be used In this case use the test setup shown in Figur...

Страница 14: ...kely they will vary widely over the tuning range Now readjust the potentiometer to a slightly lower value and do another sweep while observing the variation of R and X values At some potentiometer setting the R value will vary very little over the tuning range while the X value will remain near zero This is the estimated characteristic resistance 4 9 Transmission line losses Transmission line loss...

Страница 15: ...f operation With either type of feedline first cut it about 10 longer than the desired length taking the appropriate velocity factor into account The velocity factor of common feedlines is available from manufacturer s literature or references such as the ARRL Antenna Book If you cannot find the value or if you are using a custom type of feedline the Velocity Factor Measurement section in this man...

Страница 16: ... far end needs to be opencircuited 4 11 Transmission line velocity factor Velocity factor of a transmission line can be measured using techniques similar to the ones used for measuring quarter and half wave stubs The procedure can be performed at any frequency that the MR300 tunes but it is most practical in the vicinity of 10 MHz where line lengths are reasonable and instrument accuracy is optimu...

Страница 17: ...qfy com lxqqfy foxmail com lxqqfy qq com Figure 3 Adjust antenna tuners Figure 4 Adjust antenna tuners Figure 5 Capacitor or inductor measurement Figure 6 Determining feedline characteristic impedance Figure 7 Determining feedline velocity factor ...

Страница 18: ...surement results in a file format supported by ZPlots Usage PCC SARK100 c com port s start freq e end freq t step value o output file Where c com port name COM port name s start freq Start frequency in Hertz e end freq End frequency in Hertz t step Step value in Hertz o output file Output file name without path Example PCC SARK100 cCOM5 s14000000 e16000000 t10000 oDipole20m csv ZPlots ZPlots is an...

Страница 19: ... com URL http www lxqqfy com index files php id MR300_win 1 Using USB to connect computers and MR300 2 Click the MODE button on the MR300 to enter the PC Link interface 3 Click the DOWN button on the MR300 to enter the PC Link Waiting Link interface 4 Open the PC software Select Serial port and click Open 5 If the connection is successful MR300 will enter the PC Link scan interface 6 OK ...

Страница 20: ... MR300_app Bluetooth connection password 1234 1 Using USB to connect computers and MR300 2 Click the MODE button on the MR300 to enter the PC Link interface 3 Click the DOWN button on the MR300 to enter the PC Link Waiting Link interface 4 Bluetooth connection Password 1234 5 Open Android software Click the Connect button and select first Bluetooth 6 If the connection is successful MR300 will ente...

Страница 21: ...ttery installation Because of the transportation condition is not allowed MR300 only provides the battery interface does not take the battery Battery Specification 9 6V nickel hydrogen battery AAA 800mah Note positive and negative pole connection Step 1 Open shell Step 2 A total of 4 screws ...

Страница 22: ...Revision 171215 21 MR300 SWR Analyzer www lxqqfy com lxqqfy foxmail com lxqqfy qq com Step 3 Choosing the right battery Step 4 Pay attention to the positive and negative ...

Страница 23: ...Revision 171215 22 MR300 SWR Analyzer www lxqqfy com lxqqfy foxmail com lxqqfy qq com Step 5 Fixed battery Step 6 Install back ...

Страница 24: ...systems on which you access the manufacturer s website and select the appropriate driver always bearing in mind that the chip is the FT232R Preferably you install by using the setup executable and following the manufacturer s instructions Once installed and connected the MR300 you can verify proper installation by entering in the Device Manager of the Windows Control Panel By connecting the MR300 ...

Страница 25: ...ferences of the legs of the bridge Calibration Procedure 1 Select the Calibrate on the setup menu 2 The instrument will prompt the user with the LCD text Disconnect Load indicating to remove any load from the RF connector Press the button VAL after disconnecting the load and then the display will show In Progress indication that calibration is in progress 3 Then it will prompt to connect a 50 Ω lo...

Страница 26: ...equency The dummy antenna can be used in place of a real antenna during initial testing of the instrument The dummy antenna consists of one resistor one inductor and a capacitor in a series circuit built at the end of a connector that can be connected to the MR300 antenna The table below shows the component values for dummy antennas to any of the specified frequencies Freq Mhz C pF L uH Core Turns...

Страница 27: ...n Requires setting correct DDS frequency Arguments Response OK Error response Error freq not set Example on OK Command off Description Disables DDS signal generation Arguments Response OK Error response Example off OK Command freq Description Sets DDS frequency Arguments frequency Frequency in Hertz Response OK Error response Error invalid freq Example freq 14070000 OK ...

Страница 28: ...l com lxqqfy qq com Command imp Description Get impedance values Arguments Response SWR R X Z Error response Example imp 1 05 52 10 51 Command raw Description Get raw bridge voltages Arguments Response Vf Vr Vz Va Error response Example raw 257300 165500 31800 214500 ...

Страница 29: ...iption Scans from specified start to end frequency and get impedance values Arguments freq_start Start freq in Hz freq_end End freq in Hz step Step in Hz Response Start SWR R X Z SWR R X Z End Error response Error expected freq val Error expected step val Example scan Start 1 05 52 10 51 1 05 52 10 51 End ...

Страница 30: ...m specified start to end frequency and get raw bridge voltages Arguments freq_start Start freq in Hz freq_end End freq in Hz step Step in Hz Response Start Vf Vr Vz Va Vf Vr Vz Va End Error response Error expected freq val Error expected step val Example scan Start 257300 165500 31800 214500 257300 165500 31800 214500 End ...

Страница 31: ...Revision 171215 30 MR300 SWR Analyzer www lxqqfy com lxqqfy foxmail com lxqqfy qq com Appendix E Quick Reference Sheet ...

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