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SteppIR SARK-110, User Manual

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SteppIR SARK-110 User Manual Download Page 26

 

SteppIR

 

SARK-110

 

User’s Manual

 

Rev 1.1.7 October 29

th

, 2014 

- 26 - 

© Melchor Varela – EA4FRB 2011-2014 

In the screenshot below the circle has been changed to a VSWR of 5.0

 

 

Setup – Color Theme 

This setup permits the choice from two color theme options: 

«Black»

 or 

«White»

.  

 

The screenshots below shows graphs with color theme set to 

«White»

 and 

«Black»

: 

Summary of Contents for SARK-110

Page 1: ...document is licensed under a Creative Commons Attribution NonCommercial ShareAlike 3 0 Unported License Melchor Varela EA4FRB 2011 2014 SARK 110 Vector Impedance Antenna Analyzer User s Manual Revision 1 1 7 ...

Page 2: ...SteppIR SARK 110 User s Manual Rev 1 1 7 October 29th 2014 2 Melchor Varela EA4FRB 2011 2014 Updated to Firmware Version 0 8 x ...

Page 3: ...NS OF INPUT 10 4 4 CHANGING THE FREQUENCY 11 4 5 CHANGING THE SPAN 12 4 6 FREQUENCY PRESETS 13 4 7 USING MARKERS 13 4 8 CHANGING THE VERTICAL AXIS PARAMETER 16 4 9 SAVING AND RECALLING MEASUREMENTS 17 4 10 TAKING SCREENSHOTS 20 4 11 CHANGING THE OPERATING MODE 20 4 12 CHANGING THE SETTINGS 21 5 SCALAR CHART MODE 32 6 SMITH CHART MODE 34 7 SINGLE FREQUENCY MODE 36 8 CABLE TEST MODE TDR 38 9 FIELD M...

Page 4: ...56 15 PRECAUTIONS 60 16 REGULATORY WARNING 60 17 ACKNOWLEDGMENTS 61 APPENDIX A THEORY OF OPERATION 62 APPENDIX B FUNDAMENTAL PARAMETERS 65 APPENDIX C UPGRADING THE FIRMWARE 67 APPENDIX D OSL CALIBRATION 68 APPENDIX E FREQUENCY CALIBRATION 71 APPENDIX F DETECTOR CALIBRATION 72 APPENDIX G FREQUENCY PRESETS FILE 75 APPENDIX H SCALE PRESETS 76 APPENDIX I CUSTOM CABLE SETTINGS 78 ...

Page 5: ...ccurately resolves the resistive capacitive and inductive components of a load The measurement reference plane is automatically adjusted via the Open Short Load calibration standard for higher measurement accuracy Also the analyzer implements a transmission line addition or subtraction feature in order to make antenna measurements while discounting the effect of the feed line The user interface ba...

Page 6: ...e Intuitive and easy to use Operating modes Scalar Chart Smith Chart Single Frequency Cable Test TDR Field Mode Multi band Signal Generator and Computer Control Good accuracy over a broad range of impedances Resolves the sign of the impedance Manual and automatic positioning tracking markers Internal 2MB USB disk for the storage of measurements screenshots configuration and firmware upgrade Export...

Page 7: ...connecting the unit to a personal computer for communication and internal battery charging using a compatible mini USB cable not included The unit charges the internal battery when connected to USB The internal battery charger manages automatically the charge cycle and stops the process when battery is fully charged The complete charge cycle takes around 3 5 hours Slide the Power Switch button loc...

Page 8: ...that are the same for all operating modes of the SteppIR SARK 110 Screen layouts that show specifics for each operating mode are provided in corresponding sections of this manual 1 Diagram 11 Markers information 2 Traces 12 Detailed measurements 3 Markers 13 Frequency and span settings 4 Vertical axis labeling 14 Transmission Line length setting 5 Horizontal axis labeling 15 Reference impedance se...

Page 9: ...SteppIR SARK 110 User s Manual Rev 1 1 7 October 29th 2014 9 Melchor Varela EA4FRB 2011 2014 9 Highlighted submenu option 19 Run Hold status 10 Currently selected submenu option 20 USB Battery status ...

Page 10: ...isk Disk write operation in progress 4 3 Means of Input There are four buttons and two navigation keys on the SteppIR SARK 110 Navigator A Navigator B Run Hold Select Save Screen Save Conf é ê Ø SARK 110 Navigator A Navigator A is used to navigate within the main menu left side of the screen The active option is highlighted with a green background color Navigator B Navigator B is used for changing...

Page 11: ...disk Save Conf The Save Conf button is used to store the complete analyzer state and settings The stored state is restored automatically after the device is powered on 4 4 Changing the Frequency There are two methods of editing the frequency centre frequency for sweep modes i Use Navigator A to highlight Freq in the main menu on the left side of the display Press the Select button to display the p...

Page 12: ...rational limits 4 5 Changing the Span There are two methods of editing the Span i Use Navigator A to highlight Span in the main menu on the left side of the display Press the Select button to display the popup dialog associated with Span Then use Navigator B to change the span The span will change according to the current span frequency multiplier that is highlighted in reverse video Use Navigator...

Page 13: ...rmined frequency and span settings including the amateur radio bands and other suitable settings Use Navigator A to highlight Preset in the main menu Press the Select button to activate the Preset popup submenu Use Navigator B to highlight the desired preset Press the Select button to validate the preset selection Press any other button to cancel the operation See in the screenshot below the avail...

Page 14: ...arkers Use Navigator A to highlight either Marker1 or Marker2 in the main menu Press the Select button to activate the Marker popup submenu Available options are Enable for activating or deactivating the marker Select for selecting or deselecting the marker and Tracking for selecting the tracking mode see screenshot below The Select option activates or deactivates the display of detailed parameter...

Page 15: ...Min VSWR and Marker 2 to track the crossovers on the 50 ohm impedance value Marker2 Tracking Cross Any Z 50 0 You could also program the unit to detect the bandwidth by setting Marker1 Tracking Cross Down VSWR 2 0 and Marker2 Tracking Cross Up VSWR 2 0 Navigator B will be used to move to the different detection points except for the Max and Min tracking modes where logically there is only a single...

Page 16: ...ghtY in the main menu There are two methods of changing the selected vertical axis parameter i Press the Select button to activate the LeftY or RightY popup submenu Use Navigator B to highlight the desired submenu parameter option Press the Select button to validate the selection Press any other button to cancel the operation The screenshot below show the available parameters for the vertical axis...

Page 17: ...in menu for data file operations Press the Select button to activate the File popup submenu Use Navigator B to highlight the desired submenu File option Save Data File The Save Data File option allows saving the current measured data for further review After selecting the Save File submenu option enter the file name By default the file name has the format sark_xxx csv or sark_xxx tdr for Cable Tes...

Page 18: ...popup submenu is displayed with a list of available files Use Navigator B to highlight the desired file Press the Select button to validate the selection Press any other button to cancel the operation Once the file is selected the data is loaded and plotted Load Bitmap File Use the Load Bitmap File option to display a captured screenshot Press the Select button to finalize the operation ...

Page 19: ...ete File Use the Delete file option to delete a single file on the device disk When selecting the Delete File option a popup submenu will be displayed with the list of available files Use Navigator B to highlight the desired file Press the Select button to validate the selection Press any other button to cancel the operation Delete All Use the Delete All option to delete all user files When select...

Page 20: ...ange the character position highlighted in inverse video Press the Select button to validate the selection Press any other button to cancel the operation Select the options Load Bitmap File or Browse Bitmaps from the File menu to review the captured screenshots Also they can be reviewed on a PC because they are in Windows bitmap compatible format Ø Note the bitmap files use a significant amount of...

Page 21: ...cancel the operation 4 12 Changing the Settings Use Navigator A to highlight Setup in the main menu Press the Select button to activate the Setup popup submenu see the screenshot below Use Navigator B to highlight the desired submenu setup option Press the Select button to validate the selection Press any other button to cancel the operation Setup Calibration The calibration features are accessibl...

Page 22: ...quency Calibration See Appendix E Setup Detector Calibration See Appendix F Setup Scale The SteppIR SARK 110 provides three pre defined scale values Normal High and Low as well as automatic scaling This setting defines the maximum and minimum values for each parameter on the Y axis see Appendix H This setup is valid for the Scalar Chart Field and Multi band modes ...

Page 23: ...s setting allows the reference characteristic impedance to be changed The value can be selected from a set of predetermined values or it can be user specified selecting the Custom option Setup Automatic Power Off This setting allows the automatic power off delay to be selected from a set of predefined times ...

Page 24: ...surements in the cable test mode and transmission line operations require the proper setting of the cable type This setup allows selection of the cable parameters from a set of predetermined values for most popular coaxial cables In addition the user can specify three custom cable settings see Appendix I Setup VSWR Circle This setup allows changing the value of the constant impedance circle in the...

Page 25: ...SteppIR SARK 110 User s Manual Rev 1 1 7 October 29th 2014 25 Melchor Varela EA4FRB 2011 2014 ...

Page 26: ...lchor Varela EA4FRB 2011 2014 In the screenshot below the circle has been changed to a VSWR of 5 0 Setup Color Theme This setup permits the choice from two color theme options Black or White The screenshots below shows graphs with color theme set to White and Black ...

Page 27: ...r 29th 2014 27 Melchor Varela EA4FRB 2011 2014 Setup Plot Thickness This setup allows choice of thickness of the diagram s traces from two options Thick and Thin This option is unavailable in the Field Mode graph where traces are always set to thick ...

Page 28: ... 28 Melchor Varela EA4FRB 2011 2014 The screenshots below shows graphs with plot thickness set to Thick and Thin Setup Filter This setup offers the choice of one of two noise reduction filters or none for the Scalar Chart Smith Chart Field and Multi band modes ...

Page 29: ...ment frequency and an average from these samples is calculated The Smoothing filter is a moving average calculation for each measurement point the unweighted mean of the previous measurement points The measurement speed is not affected but there could be a loss of accuracy Ø The magnitude of the peak or valley of a rapidly changing parameter may be affected Check the results with and without the f...

Page 30: ...more convenient for most cases The Double slow option is intended for enhanced accuracy measurements because it reduces measurement ripple by doubling the number of samples taken but at the expense of a slower sweep speed This enhancement in the measurements is more noticeable when using automatic scales for measurement over a small range of values Setup Reset to Factory Defaults The Reset Factory...

Page 31: ...SteppIR SARK 110 User s Manual Rev 1 1 7 October 29th 2014 31 Melchor Varela EA4FRB 2011 2014 Setup About The about screen displays copyright information firmware release number disk size and free space ...

Page 32: ...e operation in progress 6 Main menu 15 Calibration status 7 Highlighted menu option 16 Run Hold status 8 Markers information 17 USB Battery status 9 Detailed measurements The Scalar Chart mode provides functionality for impedance measurements of antennas transmission lines and RF circuits The analyzer performs reflection measurements within a user specified frequency range defined by the frequency...

Page 33: ...bmenu and use Navigator B to highlight Scalar Chart submenu mode option Finally press the Select button to enter into Scalar Chart mode The analyzer performs the measurements and updates the plot continuously unless it is stopped by pressing the Run Hold button The results of the measurements are kept in internal memory and plotted on the display to permit user analysis The measurements can be res...

Page 34: ...tant impedance circle 13 Loaded data file name 5 Frequency start and end 14 Disk write operation in progress 6 Main menu 15 Calibration status 7 Highlighted menu option 16 Run Hold status 8 Markers information 17 USB Battery status 9 Detailed measurements The Smith Chart mode is equivalent to the Scalar Chart mode but in this case the complex reflection measurements for the user specified frequenc...

Page 35: ...ress the Select button to enter into Smith Chart mode As in the Scalar Chart mode the measurements are performed continuously unless paused by pressing the Run Hold button The impedance measurement data and marker positions are preserved when changing to the Scalar Chart mode and vice versa For example markers can be set at the zero reactance points of the plot where the plot crosses the X axis in...

Page 36: ...nce or capacitance values 13 Transmission Line length setting 5 Parallel impedance complex form 14 Reference impedance setting 6 Parallel circuit equivalent 15 Calibration status 7 Parallel resistance and equivalent inductance or capacitance values 16 Run Hold status 8 Highlighted menu option 17 USB Battery status 9 Main menu The Single Frequency mode provides impedance measurements at a single fr...

Page 37: ... use Navigator B to highlight Single Frequency submenu mode option Finally press the Select button to enter into Single Frequency mode The analyzer performs the measurements continuously unless it is paused by pressing the Run Hold button The measurements can be resumed at any time by pressing the same button again This mode offers optional VSWR audio feedback When activated by the menu option Aud...

Page 38: ...14 Loaded data file name 6 Main menu 15 Disk write operation in progress 7 Highlighted menu option 16 Calibration status 8 Markers information 17 Run Hold status 9 Detailed measurements 18 USB Battery status Cable Test or Time Domain Reflectometer TDR mode is intended to identify potential coaxial cable faults that could disrupt signal transmission Unlike native TDR test equipment the method of me...

Page 39: ... mode option Finally press the Select button to enter into Cable Test mode This measurement requires the user selection of the cable s characteristic impedance and velocity factor These settings are obtained from the selected cable in the Setup Cable Type menu option As in the other modes the measurements are performed continuously and controlled by the Run Hold button but in this case it takes so...

Page 40: ...SteppIR SARK 110 User s Manual Rev 1 1 7 October 29th 2014 40 Melchor Varela EA4FRB 2011 2014 Figures below illustrate the responses of known discontinuities ...

Page 41: ...ulse Response Unity reflection Unity reflection Open Unity reflection 180º Unity reflection 180º Short Positive peak Positive level shift Resistance R Z0 Negative peak Negative level shift Resistance R Z0 Positive then negative peaks Positive peak Inductance Negative then positive peaks Negative peak Capacitance Display ...

Page 42: ...um values 13 Calibration status 6 Highlighted menu option 14 Run Hold status 7 Main menu 15 USB Battery status 8 Frequency and span settings Field Mode is equivalent to the Scalar Chart mode but with a more visible presentation aimed at operation in the field especially if combined with the White color theme Frequency and magnitude of maximum and minimum points in the trace are shown at the top of...

Page 43: ...in the main menu Press the Select button to activate the Mode popup submenu and use Navigator B to highlight Field submenu mode option Finally press the Select button to enter into Field mode Operation is similar to the scalar chart mode with some limitations such as one trace is plotted and the markers feature is not available ...

Page 44: ...tion status 5 Highlighted menu option 12 Run Hold status 6 Frequency and magnitude value for each band 13 USB Battery status 7 Detailed measurements at centre frequency of selected band The Multiband mode is a unique feature of the SteppIR SARK 110 to display the plot of an impedance parameter in four scalar charts simultaneously This feature is ideal for tuning multiband antennas Additionally it ...

Page 45: ...to enter into Multi band mode Operation is similar to the scalar chart mode with some limitations such as unavailability of markers there is only a single trace and load and save data file operations are not available The main menu Band option allows selecting the active band The selected band is highlighted in the frequency axis of the band graph Frequency and span settings are applied to the sel...

Page 46: ... B to highlight Signal Generator submenu mode option Finally press the Select button to enter into Signal Generator mode The screenshot below shows the signal generator screen in continuous frequency operation mode The screen includes the programmed frequency in Hertz and the output power level expressed both in dBm and volts Frequency can be changed as usual see chapter 4 4 For changing the outpu...

Page 47: ...Varela EA4FRB 2011 2014 The signal generator outputs continuously unless it is paused by pressing the Run Hold button In the Hold state the level graph and power level indicators change to red Signal generation can be resumed at any time by pressing the same button again ...

Page 48: ...Continuous frequency mode o Frequency Sweep frequency mode Repeat o Continuous Continuous signal generation o Single Signal generator stops after a single sweep o Count Signal generator stops when number of sweeps reach count Count Function o Linear Linear frequency increase or decrease o Log Logarithmic frequency increase or decrease o Bi Linear Start Stop Stop Start sweep Linear o Bi Log Start S...

Page 49: ...SteppIR SARK 110 User s Manual Rev 1 1 7 October 29th 2014 49 Melchor Varela EA4FRB 2011 2014 ...

Page 50: ... the screenshot below Another useful output power level value for receiver testing is 107dBm which is 1uV into 50 ohms and equates to S1 on an S meter This power level is not available in the SteppIR SARK 110 but a 34dB attenuator could be made to give 107dBm with a pi network of two 52 ohm resistors as shunt in and out and a 1 2k 52 ohm series resistor ...

Page 51: ...install a dedicated driver since the communication is implemented using the standard USB HID interface Use Navigator A to highlight Mode in the main menu Press the Select button to activate the Mode popup submenu and use Navigator B to highlight Computer Control submenu mode option Finally press the Select button to enter into Computer Control mode The analyzer establishes the USB link when it is ...

Page 52: ...11 2014 The command interface specification is open for anyone wishing to develop client software Source code examples of the communication interface are available for different operating systems This information is available at the following link http www sark110 com commands interface ...

Page 53: ... specify up to three custom cable types The selection of the cable is available in the menu Setup Cable Type see the screenshot below The transmission line length has to be entered into the TL Len menu option within the Main menu Use negative quantities for Subtract operations transpose to load and positive quantities for Add operations transpose to input The pop up edit dialog is activated by pre...

Page 54: ...ated at the far end Set the SteppIR SARK 110 to Smith Chart mode and select Preset Full HF The Smith Chart will show a spiral from infinite impedance and going towards the centre When setting negative length values this spiral will be progressively unrolled and transposed to the infinite impedance point when the exact length will be set Then if a load is connected at the cable far end the presence...

Page 55: ...SteppIR SARK 110 User s Manual Rev 1 1 7 October 29th 2014 55 Melchor Varela EA4FRB 2011 2014 ...

Page 56: ...ustable reference impedance Save to disk and recall functions Three available fixed scale options and automatic scaling Presets for popular coaxial cables Add subtract transmission line Black or white color schemes Adjustable plot trace widths Scalar Chart Mode Graphical plot of two user selected parameters in a rectangular chart Two markers with manual or automatic positioning Display detailed pa...

Page 57: ...h 1 Hz resolution Programmable output level from 73 dBm to 10 dBm Continuous and frequency sweep modes Linear logarithmic bi linear and bi logarithmic sweep modes Markers Tracking modes o Peak Min o Peak Max o Absolute Min o Absolute Max o Value Cross Any o Value Cross Up o Value Cross Down Interface Full color 3 TFT LCD 400 x 240 4 dedicated buttons 2 navigation keys MCX antenna socket PC Interfa...

Page 58: ...ture Single conversion super heterodyne Two independent measurement channels for simultaneous voltage and current measurement for precise phase measurement Two synchronized 12 bit analog to digital converters Processor 72 MHz STM32 MCU 256KB Flash 48KB SRAM RF Output Connector MCX socket Output power 10 dBm 0 1mW 70 7mV rms into a 50 ohm load Power 3 7V 1000mAh Internal Lithium Polymer battery USB...

Page 59: ...SteppIR SARK 110 User s Manual Rev 1 1 7 October 29th 2014 59 Melchor Varela EA4FRB 2011 2014 MCX to BNC adapter pigtail x 1 Allen key x 1 ...

Page 60: ... product emits a low power RF signal during its active measurement mode When connected to an antenna system this radiation may cause interference to nearby communication systems Connect only for as long is necessary 16 Regulatory Warning This equipment is intended for use by radio amateurs in a laboratory environment only The product generates and radiates radio frequency energy and has not been t...

Page 61: ...ing the DesignSpark PCB tool Product information is available at www designspark com pcb The analyzer firmware has been developed using the Lite edition of the Atollic TrueSTUDIO for STM32 Product information is available at www atollic com FAT File System was provided by the ChaN FatFs module The STM32 firmware and USB library are provided by STMicroelectronics Many thanks to Dan Maguire AC6LA fo...

Page 62: ...surement and a local oscillator signal for the tuned receivers mixers One of the DDS channels operates at the specified test frequency and the other is programmed to operate just 1 kHz above it which is the value of the intermediate frequency The DDS has an internal oscillator driven by an external 24 MHz crystal and is able to multiply this clock internally by a user configurable factor of 4 to 2...

Page 63: ...he voltage measurement and the other for the current measurement The output of the mixers is the 1 kHz I F signal which is then amplified and filtered with a bandpass filter before digitizing Identical mixer and amplifier circuits are used for both the voltage and current sensing paths Any small differences in the gain and phase shift of these two signal paths are taken care of by the calibration ...

Page 64: ...SteppIR SARK 110 User s Manual Rev 1 1 7 October 29th 2014 64 Melchor Varela EA4FRB 2011 2014 ...

Page 65: ...e angle of the ratio of the amplitude of the voltage to the amplitude of the current expressed in degrees VSWR Voltage Standing Wave Ratio It is a measure of how efficiently radio frequency power is transmitted from a power source through a transmission line and into a load for example from a power amplifier through a transmission line and into an antenna RL Return Losses Return loss is the negati...

Page 66: ...Ref Pwr Percentage of Reflected Power 100 2 Rho RPwr Q Quality Factor It is defined as the ratio of the energy stored in a component to the energy dissipated by the component R X Q Cs Series Capacitance Equivalent series capacitance at the measurement frequency Ls Series Inductance Equivalent series inductance at the measurement frequency Cp Parallel Capacitance Equivalent parallel capacitance at ...

Page 67: ...e an update file in the format SARK110 VAA APP x y z dfu Where x y z is the incremental version number 1 Connect the SteppIR SARK 110 to the PC with a USB cable 2 Copy the firmware file e g SARK110 VAA APP x y z dfu to the SARK s USB disk 3 Power off the SteppIR SARK 110 and power it on again while simultaneously holding down the Run Hold button 4 The Device Firmware Upgrade screen prompts you to ...

Page 68: ...ving the same value as the reference impedance These loads are connected sequentially to the end of the test lead as instructed on the screen as described below Ø To set the reference impedance please refer to Setup Z0 in the chapter 4 12 The place where these loads are connected during the calibration is called the Reference Plane é ê Ø SARK 110 Reference Plane Open Short Load The analyzer perfor...

Page 69: ...bration procedure is as follows Connect the open load Press the appropriate button to continue or to exit The calibration progress will be shown in the display bar Connect the short circuit load Press the appropriate button to continue or to exit The calibration progress will be shown in the display bar ...

Page 70: ...4 70 Melchor Varela EA4FRB 2011 2014 Connect the reference load Press the appropriate button to continue or to exit The calibration progress will be shown in the display bar Press the appropriate button to apply the new calibration settings or to cancel them ...

Page 71: ...the frequency while measuring it with an accurate frequency counter or alternatively zero beat it against WWV Use Navigator B to change the frequency The frequency will change according to the current frequency multiplier that is highlighted in reverse video Use Navigator A to change the frequency multiplier position if needed When an exact 10 MHz output is obtained press the Select button to perm...

Page 72: ...teness The following test loads are required 0 50 100 and 200 ohm These loads need to be precise and stable and should be properly implemented in order to have the least possible stray impedance Before performing this operation it is strongly recommended that the file containing the factory results detcalib dat is backed up to enable a restore if needed The calibration operation is available at Se...

Page 73: ...014 The calibration progress will be shown in the display bar Connect the 50 ohm load Press the appropriate button to continue or to exit Connect the 100 ohm load Press the appropriate button to continue or to exit Connect the 200 ohm load Press the appropriate button to continue or to exit ...

Page 74: ...ober 29th 2014 74 Melchor Varela EA4FRB 2011 2014 The calibration is completed The calibration coefficients are shown at the bottom of the screen for information Press the appropiate button to apply the new calibration settings or to cancel them ...

Page 75: ...the frequency o def_mul_span default multiplier for setting the span o marker1_freq default marker 1 frequency specified in MHz o marker2_freq default marker 2 frequency specified in MHz Example 600M 500 KHz 0 1 0 9 3 4 0 2 0 5 160M 1 8 MHz 1 3 2 3 4 5 1 8 2 0 80M 3 6 MHz 1 6 5 6 5 6 3 5 3 8 60M 5 3 MHz 3 3 7 3 5 6 5 2 5 5 40M 7 1 MHz 5 1 9 1 5 6 7 0 7 2 30M 10 1 MHz 8 1 12 1 5 6 10 1 10 2 HF RFID...

Page 76: ...00 Linear Lp 100 100 Linear High Min Max Scale Rs 10 5000 Log Xs 2500 2500 Linear Rp 10 5000 Log Xp 2500 2500 Linear Zs 10 5000 Log Zs 100 100 Linear VSWR 1 00 100 00 Log RL 60 0 Log CL 0 30 Log Rho 0 1 0 Linear Rho 190 190 Linear Rp 0 100 Linear Q 0 50 Linear Cs 100000 100000 Linear Ls 1000 1000 Linear Cp 100000 100000 Linear Lp 1000 1000 Linear Low Min Max Scale Rs 0 250 Linear Xs 125 125 Linear...

Page 77: ...al_def txt Scale High scal_hig txt Scale Low scal_low txt Scale Auto scal_aut txt The files must contain an entry for each parameter with the following syntax min max log Y N Note that logarithmic scales do not accept negative ranges Example file name scal_def txt 10 1000 Y Rs 500 500 N Xs 10 1000 Y Rp 500 500 N Xp 10 1000 Y Zs 100 100 N Zs 1 00 25 00 Y VSWR 40 0 N RL 0 20 N CL 0 1 0 N Rho 190 190...

Page 78: ...e custcab txt and the format for each cable entry in the file is as follows legend Z0 VF K0 K1 K2 Where o legend string to be display in the preset menu max length 20 o Z0 characteristic impedance o VF velocity factor o K0 DC resistance dB 100ft o K1 coefficient for conductor loss dB 100ft o K2 coefficient for dielectric loss dB 100ft Example Test cable 1 50 0 68 0 063897 0 192292 0 000051 Test ca...

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