These are considered to be standardized impedance values with cables readily available. VSWR to Return Loss Reference/Conversion Table. A power sensor with a return loss of –23 dB is connected to a calibration source with a return loss of –20 dB. 1. In summary, return loss is the loss of signal power due to signal reflection or return by a discontinuity in a fiber-optic link or transmission line. This general RF calculator includes calculations of path loss, VSWR and wavelength as well as conversions between many common terms used in the wireless industry. Finally, an antenna VSWR monitoring system is shown. VSWR. All our transmitters above 50W feature a simple Forward and Reflected power meter on the front panel. Advanced Control Components. This formula is used to calculate the VSWR from the given return loss. Where, RL = Return loss in dB. Return loss is a measure in dB of the ratio of power in the incident wave to that in the reflected wave, and we define it to have a negative value. Using complex impedance is an important technique for handling multi-component AC circuits. Furthermore, a small VSWR reduces reflections from the antenna. Figure 1. Particularly, reflected power and mismatch loss help describe the. A commonly required conversion is between return loss and VSWR, and some values are tabulated in chart, along with a graph of these values for quick reference. This can be built into a FLEXI-BOX and a transmission line PCB is. 5:1. The load can be an antenna, filter or other equipment connected to a transmission line. The following formula is used to calculate the Return Loss (RL) from Voltage Standing Wave Ratio (VSWR). Return loss, also known as reflection loss, is a measure of the fraction of power that is not delivered by a source to a load. To use the calculator, enter the VSWR value for each of the assembly components being added, as exampled below. 011. 16-Feb-2022. Conclusion: In summary, RL and VSWR formulas and calculators are valuable tools that enhance the efficiency, accuracy and consistency of RF engineering tasks such as measurement, analysis, troubleshooting and system design. Knowing the VSWR value allows engineers to determine the amount of signal loss that occurs due to reflection and calculate the return loss for the system. 13 24. VSWR Return Loss Calculator Find VSWR. This general RF calculator includes calculations of path loss, VSWR and wavelength as well as conversions between many common terms used in the wireless industry. Return loss is when the transmitted signal is not completely. This calculator computes the VSWR, reflection coefficient, return loss and matching loss in a transmission line. RF engineers often measure return loss on a “dB. 0708,min,max = =A VSWR value of 2 or under is typically acceptable for antennae in communications systems. Return Loss (dB) 3. Qorvo MatchCalc is a downloadable RF matching calculator designed to provide ideal component values for matching the impedance of a S1P or S2P file to a desired system or reference impedance. 98 dB return loss. multiplier m=1 RL=50*1 multiplier n=-4 XL=40*-4 multiplier k=2 Z0=50*k Q2: An antenna with a load, ZL=RL+jXL, is connected to a lossless transmission line Z0? What is the phase angle of the reflection coefficient in degrees toRelated Calculators. , there is no standing wave). It is often expressed in terms of a percentage, or in dB. Return loss can be converted to mismatch loss and the calculator also gives an intuitive sense of the impact by providing the forward and reflected power ; Related Posts. long or about 1. Despite Equation [Math Processing Error] 10. Reflection Calculator. Return Loss or a VSWR: return loss (dB) (evaluated as neg. Return Loss or a VSWR: return loss (dB) (evaluated as neg. The equivalent VSWR is 1. Our RF calculators and converters will provide the figures you need for your radio frequency engineering needs. The VSWR can easily be converted into Return Loss ( RL R L ) using the following formula: RL = 20log10(VSWR + 1 VSWR − 1) R L = 20 log 10 ( V S W R + 1 V S W R − 1) Directional power meter. VSWR is a measure of the reflected power on a transmission line. When an ideal match is not encountered by the incident (forward) wave, part of it is coupled to the load and part is reflected back to the source. If a complex plane is used with resistance along the real axis then the reactances of the capacitor and inductor are treated as imaginary numbers. 많은 초심자들이 대체 왜 return loss란 지표와 VSWR이란 지표가 혼용되는지 이해하기 어려워 하는 경향이 있다. The relationship between composite return loss and individual return loss in the constructive condition of identical mismatches is that the composite VSWR is the the square of the individual VSWRs. This mix of web-based tools and downloadable Windows software was developed to help engineers design faster and more accurately. VTX Power in mW. Noise Conversion Calculator. Conversion Formulas. Vswr To Rl Formula. This tool calculates the S11 from the Voltage Standing Wave Ratio (VSWR). Return Loss is the amount of power that is lost in the signal returned/reflected by a discontinuity in a transmission line. Return loss and insertion loss are both measurements of how a component or device affects the transmission of signals in a system. VSWR: RL (dB) 1. Forward Power (dBm)Skin depth calculator Stripline Impedance calculator Smith charts VSWR/Return loss converter Wavelength calculator Wilkinson splitter designer. Click here to use the VSWR Calculator . VSWR =. The relationship between composite return loss and individual return loss in the constructive condition of identical mismatches is that the composite VSWR is the the square of the individual VSWRs. VSWR Calculator. حساب رل: انقر فوق الزر "حساب" أو "حساب"، وسوف تستخدم الآلة الحاسبة الصيغة لتحديد قيمة RL المقابلة. VSWR to Return Loss . 1 Definition of ‘power waves’ The waves going towards the n-port are a = (a1, a2,. S21 is the transmission coefficient of Port 2. This trace would typically be accepted as good. The VSWR can then be calculated from the return loss (RL) with the following equation. This online reflection coefficient to return loss calculator calculates the return loss (dB) by entering the reflection efficient Γ (= value. This calculator uses the following formulas for converting the values between the VSWR, return loss, reflection coefficient, and mismatch loss. Γ = Reflection coefficient. 5 1 1. 045 foot length of this part in smaller units: 0. At 1000 MHz, the S11 (dB) = -RL (dB) = -15 dB. The calculated value is MUCH worse. So a perfect match can be represented by the range 0. A low VSWR will minimize reflections from the antenna. LOSS VSWR LOSS VSWR LOSS VSWR LOSS VSWR LOSS VSWR (dB) (dB) (dB) (dB) (dB) return loss Vs. While we’re at it, the reflection coefficient is: Γ=(75-50)/(75+50)=0. VSWR table of return loss vs. Introduction to VSWR. By entering the values given above into the VSWR calculator, we see that the probable assembly-chain VSWR of: 1. Stripline Impedance calculator Smith charts VSWR/Return loss converter Wavelength calculator Wilkinson splitter designer. The voltage standing wave ratio (VSWR) is defined. (3) ea 90°E-Bend - 1. Click here for VSWR to RL CalculatorReturn Loss to VSWR Reference/Conversion Table. This calculator is designed to be an informational and educational tool. The return loss of a system is defined as the ratio of incident power to reflected power and is measured in dB. 045 foot length of this part in smaller units: 0. Enter VSWR, Reflection Coefficient, or Return Loss to calculate remaining values. An equation for the prediction of the Return Loss of cascaded systems has been previously presented and validated. In one typical RF application, VSWR is used to measure the amount of reflection due to impedance mismatch. R = 10log 10 (P incident /P reflected) and. S11 is the reflection. This is the only way to calculate the total impedance of a circuit in parallel that includes both resistance and reactance. VSWR Mismatch Errors: Both amplitude and phase errors are introduced when mismatched impedances are present at an electrical interface. Any other value indicates that a portion of the energy is reflected. Fill in the input field and select the input type and click the "calculate" button to show the values. S22 would be the reflected power radio 2 is attempting to deliver to antenna 2. 98 dB is equal to the equaivalent return loss of 1. 259 0. 표현할 때는 VSWR 값을 어떤 비율값처럼 표현하는데, 예를 들어 아래수식에 의해 VSWR이 3으로 계산되는 경우는 VSWR이 3 : 1 이다 라는 식으로 표현한다. A power meter may also be used to calculate cable loss. Summarizing: Directivity is ratio of power density in a specified direction to the power density averaged over all directions at the same distance from the antenna. You calculate return loss by using the reflection coefficient, which measures the ratio of the reflected wave to the incident wave at a given point in the transmission system. R = 20log 10 (E incident /E reflected)Let’s end our discussion with a table of reflection VSWR, refection coefficient and return loss values (and remember that our VSWR calculator can provide any values you need). Antenna). The field calculator is a very powerful but frequently The following pages contain calculator routines, or “recipes”, for use within the Field Calculator misunderstood and underutilized tool within the 3D “Fields” Post-Processor. 1. VSWR (Voltage Standing Wave Ratio) = [1+Sqrt (Pr / Pf)] / [1-Sqrt (Pr / Pf)] Pf = Forward Power (Watts); Pr = Reflected Power. You can take the readings from. is of particular concern in the implementation of Gigabit Ethernet (1000BASE-T) The value of impedances at the ends of the link must be equal to the characteristic impedance of the link. A calculator designed to compute and calculate the VSWR, return Loss of a circuit and matching loss in a transmission line based on the parameters you enter. Select the FREQ-RETURN LOSS using the Up/Down arrow key and press ENTER. 600mW. 5 0 0. 1) RL dB = 10 log P i P r. This is an ideal open or short circuit, equivalent to VSWR=infinite. Enter the source characteristic impedance and the load impedance then press "Calculate" below. 223:1 VSWR (It is slightly improved because of Component A having more insertion loss than. 1. Return Loss and Mismatch Loss Calculator. 5 1 1. 1. The Insertion Loss formula is defined as the loss of signal power resulting from the insertion of a device in a transmission line or optical fiber and is usually expressed in decibels (dB) and is represented as I L = 20* log10 (V t / V in) or Insertion Loss = 20* log10 (Voltage / Input Signal Amplitude). Finally, an antenna VSWR monitoring system is shown. When you look at a graph of a return loss formula, the negative sign is often omitted and is sometimes used interchangeably with the S11 parameter. Free Online Engineering Calculator to quickly convert a Return Loss (dB) into a VSWR. 54 dB (11% of your transmitter power is reflected back). 8. This is equivalent to VSWR 5. VSWR Mismatch Errors: Both amplitude and phase errors are introduced when mismatched impedances are present at an electrical interface. When you look at a graph of a return loss formula, the negative sign is often omitted and is sometimes used interchangeably with the S11 parameter. Equations $$VSWR = \frac{1 + \Gamma}{1 - \Gamma}$$ $$\Gamma = \frac{VSWR-1}{VSWR+1}$$ $$L_{R} = -20log_{10}\Gamma$$ Hence, the return loss is always lower than the ideal system (i. For transmission lines to have the highest quality, it is necessary to have impedance matching. Set the start and stop frequencies F1 and F2. Calculate VSWR, Return Loss, etc. Return loss is the measure of how small the “return” or reflection/echo is. The return loss & VSWR is related by the following formula, from which we can calculate return loss for a given VSWR. Standing Wafes merupakan daya yang tidak diterima oleh beban dan dipantulkan Kembali sepanjang saluran transmisi. This can be built into a FLEXI-BOX and a transmission line PCB is available which easily adapts for this circuit with a simple trimming operation. 1, directivity does not depend on the distance from the antenna. As an example of common VSWR values, a VSWR of 3. Reflection Coefficient to Impedance Converter Convert a reflection coefficient in Magnitude Angle format into Impedance and vice versa. A high. Since it is a logarithmic measurement, it is very useful when displaying very small reflections. As an added bonus, the results are modifiable and can calculate. 3 Attenuation Frequency (MHz) Attenuation (dB/100 m) Attenuation (dB/100 ft) Average Power (kW) 1. But, for a practical system, there will be a small impedance. A return loss conversion table is used to quickly convert VSWR values into return loss values. Yoni Calculator Online Test System Configurator ezSample. Suppose the wave is not matched with load and signal there is some unwanted signals are interrupted or signal loss is occurred. Even if a computerYoni Calculator Online Test System Configurator ezSample. 1. 0. In this case, you may also need to calculate localized heating due to a current standing wave. This general RF calculator provides path loss, VSWR and wavelength as well as conversions between many common. For example, a VSWR of 1. VSWR (Voltage Standing Wave Ratio) is a measurement of how well matched a radio transmitter and transmission line is to a load such as an antenna. The lower the VSWR is, the better the antenna is impedance-matched to the transmission line and the higher the power delivered to the antenna. If the power incident on a load is Pi P i and the power reflected by the load is Pr P r, then the return loss in decibels is [6, 7] RLdB = 10 log Pi Pr (2. Return Loss is similar to VSWR and is generally preferred in the cable industry to a VSWR specification. Solution: First the VSWR figures are converted to reflection coefficient magnitudes: Then the mismatch uncertainty is: M u = ±200 (0. 9913 and LMR-400 are popular “low-loss” RG-8 types. Lower VSWR means lower reflection power (good impedance matching); thus, power transfers to load will be high. Solved Example. Note that in general S-parameters are a function of frequency (i. The VSWR is a measure of the matching of the antenna to the source and feeder cables. VSWR and Return Loss RF Calculator. This impedance mismatch can be with a device inserted in the line or with the terminating load. Enter a value for VSWR (remember: VSWR should be a number larger than 1. Convert S11 to return loss; Compute Voltage Standing Wave Ratio (VSWR) from Return Loss; References [1] Return Loss on Wikipedia The formula for insertion loss in decibels (dB) is: Insertion Loss (dB) = 10 * log10 (Pin / Pout) Where: Pin is the input power or signal level. Please Support RF Cafe by purchasing my ridiculously low−priced products, all of which I created. Now let's look at the response. For support with the MatchCalc tool, contact tool-feedback@qorvo. Convert the VSWR value to a ratio by subtracting 1 from the VSWR value. Note: The historical definition of return loss results in a negative sign. In logarithmic terms, the formula for return loss is given as: Even if the measured reflection value on the VNA is -25dB, the negative sign is ignored when representing return loss. Antenna Downtilt and Coverage Calculator. Calculates the resistor values, attenuation, 'impedance', reflection coefficient, VSWR and return loss of a T attenuator. Reflections propagate back and forth in a line, but most assessments only consider the effects of the initial reflection because the back and forth energy attenuates until it is untraceable. VSWR & RL Power Home Enter Calculates VSWR Return Loss Match Efficiency Rho Forward Power Reflected Power dB % Input Power Watts Power Attenuation dBm Output Power Output Power (dBm) = Input Power (dBm) - Attenuation (dB) VSWR = Voltage Standing Wave Ratio Power (dBm) = 10 x Log [ Power (Watts) ] + 30 dB Attenuation. R is the symbol for return loss, which as previously discussed is the ratio, in decibels, of incident power P incident to reflected power P reflected, or incident voltage to reflected voltage, described in the following two formulas. Free Online Engineering Calculator to quickly convert a Return Loss (dB) into a VSWR. VSWR. 405 inch. These are considered to be standardized impedance values with cables readily available. Return loss can be measured by using microwave and RF test. Reflection -10dB: 1/10 th of the RF energy is being reflected. It is related to return loss as follows. How to Use? Using the VSWR to RL Calculator involves the following steps: Enter. Then click the "Calculate" button next to the value you just typed to compute the others. VSWR is a function of the characteristic impedance of the transmission line and the impedance of the antenna. 5:1. Pi Attenuator Calculator. Please Support RF Cafe by purchasing my ridiculously low−priced products, all of which I created. Both decimal point and comma are ok. Return loss, also known as reflection loss, is a measure of the fraction of power that is not delivered by a source to a load. Calculate the VSWR in another column. A VSWR of 6 or more is pretty high and will generally need to be improved. e. It's assumed that the source impedance is also complex. 3. comThere are many antenna parameters out there. To use the calculator, enter the VSWR value for each of the assembly components being added, as exampled below. If there is something in the microwave universe that you need a different calculator for, drop us a note and we'll see what we. 155 dB. I have already calculated the cascaded VSWR and RL using the RSS method (very similar result to simply multiplying each components VSWR as Itay mentioned), but the problem is that the result is not even close to the measured value of return loss. Our RF calculators and converters will provide the figures you need for your radio frequency engineering needs. 19. To help the engineers conducting VSWR sweeps, Lou developed the PIM and. YourR is the symbol for return loss, which as previously discussed is the ratio, in decibels, of incident power P incident to reflected power P reflected, or incident voltage to reflected voltage, described in the following two formulas. There is a resistive axis that is down the middle of the chart,In no event will Qorvo be liable to any user of these tools for any loss or damages, including without limitation, indirect or consequential damages arising out of or associated with the use of these tools. Convert the load VSWR to load return loss per the following equation: RL Improved = 2*Attenuator + RL Load [dB] (where RL=Return Loss) Of course, the method can be reversed to predict the attenuator required to improve a load VSWR by a predetermined amount. 2%) = ±3. The return loss scale is normally set up from 0 to 60 dB with 0 being an open or a short and 60 dB would be close to a perfect match. VSWR/Return Loss Calculator will find VSWR, Return Loss, Mismatch Loss, and the Reflection Coefficient given any one of the listed input types. Mismatch Loss: Reflected Power Through Power (dB) Coefficient, VSWR is defined as the maximum voltage of the standing wave (E max) to the minimum voltage of the standing wave (E min ). long or about 1. Values for L and C will be calculated for the four topologies shown. 98 dB. Now, let us investigate the physical meaning of return loss. Where, RL = Return loss in dB. Calculate. 045 foot x 12 inches/foot x 1000 mils/inch=540 mils. reflection coefficient Calculator. The VSWR to RL Calculator employs this formula to convert VSWR values into RL values. To use this calculator, enter one of the following data: the voltage standing waves ratio VSWR, the return loss RL, the reflection coefficient ρ, the power ratio ρ 2, the forward and reflected power P fwd and P ref; or the impedances Z c and Z l. 1) (2. Cable impedance ohm. e. Radio Frequency Engineering Calculator. A table of convenient values are presented at the bottom. Result: Free Space Path Loss (FSPL) calculations are often used to help predict RF signal strength in an antenna system. RL = 20 * log10 ( (VSWR + 1) /. 7. Return Loss and Mismatch Loss Calculator Calculates the absolute load impedance, reflection coefficient, VSWR, return loss and mismatch loss of a load. Example 1:. 4 centimeters. 6 dB of mismatch loss). 05 + 1. RF calculations and conversions include metric-standard, link. Forward Power Watts ? Reflected Power Watts ? VSWR → RL (Return Loss). But, for a practical system, there will be a small impedance. Calculates the resistor values, attenuation, minimum attenuation, 'impedance', reflection coefficient, VSWR and return loss of a matching Pi attenuator. Formally, S11 is the negative of return loss and. Example Problem Find the SWR of the transmission line or wave guide whose load or. Return Loss (dB) VSWR. Return Loss. VSWR Calculator: This is the ratio of maximum voltage to minimum voltage in standing wave pattern. Enter the power of your VTX and your antenna's to estimate your range. As we have seen, besides of the load impedance, this method measures also the real power delivered to the load. Voltage standing wave ratio (VSWR) (pronounced "vizwar" [1] [2]) is the ratio of maximum to minimum voltage on a transmission line . These are two different ways to measure the same thing. Any other value indicates that a portion of the energy is reflected. The Smith Chart graphically maps S11=reflection coefficient= (ZL-Z0)/ (ZL+Z0) to Load Impedance (ZL), normalized to Z0 (source impedance = center of chart). Pout is the output power or signal level. Due to mismatches in impedance within the connector, some of the signal is reflected. VSWR is the ratio of voltage applied. To use this calculator, enter one of the following data: the voltage standing waves ratio VSWR, the return loss RL, the reflection coefficient ρ, the power ratio ρ 2, the forward and reflected power P fwd and P ref; or the impedances Z c and Z l. Wavelength Calculator. Conversion Formulas. 25 dB of mismatch loss); a VSWR of 7. Loss increases with distance, so understanding the FSPL is an essential parameter for engineers dealing with RF communications systems. The VSWR/return loss calculator from Pasternack will find VSWR, return Loss, mismatch loss, and the reflection coefficient given any one of. Pout is the output power or signal level. 1) VSWR Calculation. VSWR is a function of the characteristic impedance of the transmission line and the impedance of the antenna. This is because the parasitics of lumped elements tend to kill the frequency response as you go higher in frequency. VSWR. 356. Given a certain level of heat generation within an assembly, thermal dissipation occurs through three primary mechanisms. VSWR. The equivalent VSWR is 1. 12 VSWR max. Return Loss is a logarithmic scale, and Voltage Standing Wave Ratio (VSWR) is a linear scale. We have designed a special VSWR and Return Loss Calculator. The new calculator remains Excel-based; however, provides an enhanced interface so users can: Add radio/tester as a component as it impacts some calculation. How to improve the Return. [email protected] insertion loss, return loss is also generally described in decibels of power. The result is an antenna VSWR or return loss measurement corrected for cable loss. A ratio of 2:1 indicates that reflections have resulted in a standing wave with a maximum amplitude that is twice as large as its minimum amplitude. VSWR is the ratio of maximum voltage to minimum. 2. Measured forward power vs. Here we will learn more about the meaning of VSWR and the associated VSWR formulas. This can be built into a FLEXI-BOX and a transmission line (50 Ohm track) PCB is available which easily adapts for this circuit with one simple trimming. So a perfect match can be represented by the range 0. VSWR is determined from the voltage measured along a transmission line leading to an antenna. VSWR didefinisikan sebagai rasio tegangan maksimum ke minimum pada saluran tanpa rugi-rugi. For this type application, Simple slope and offset correction coefficients for the RL measurement are. Enter the source characteristic impedance and the load impedance then press "Calculate" below. 12] = 6 dB. Lower VSWR is always desirable for a system. Given a return loss (variable = RL ) in dB, the VSWR is calculated as follows: The magnitude of the reflection coefficient is defined as Rho , where Rho = ( 10 ^ (RL/-20)): e. T Attenuator Calculator. This ratio can also be measured in dB, and expressed as Return Loss. In contrast to Return Loss, VSWR displays the match of the system linearly. A calculator designed to compute the VSWR,return loss and matching loss in a transmission line. 7145 VSWR 6 Directivit y of directiona l coupler 23 dB 0. The Smith Chart achieves this by superimposing a grid on S11 that maps load impedance. By entering the values given above into the VSWR calculator, we see that the probable assembly-chain VSWR of: 1. Measured forward power vs. 01:1 to 3. VSWR Calculator. Formula Voltage standing wave ratio is equals to one plus toue (Γ) is reciprocal of one minus toue (Γ) Toue (Γ) is equals to Voltage standing wave ratio minus one reciprocal of. This is an online calculator that calculates Return Loss based on VSWR. LC Impedance matching network designer Enter the input and output impedances to be matched and the centre frequency. As an added bonus, the results are modifiable and can calculate the other values. 098Ω resistor in parallel with a 306. 0 indicates about 75% of the power is delivered to the antenna (1. 예를 들어 Return loss가 10dB 정도라면, VSWR은 2:1 이하가 되어서 입력매칭이 비교적 잘된 경우로 평가하며, Return loss가 14 dB 정도가 되면 VSWR은 1. The Antenna Downtilt and Coverage Calculator (aka Antenna Tilt Angle Calculator) is used to determine the approximate downward angle, measured in degrees, which the transmitting antenna is to be positioned for optimal signal strength and coverage. In this Inside Wireless episode we will look at Voltage Standing Wave Ratio (VSWR), |S11|, and Return Loss. This paper further validates this equation against experimental data obtained for. Print - Advertisement - A calculator designed to compute the VSWR, reflection coefficient, return loss and matching loss in a transmission line Inputs. VRMSF and VRMSR are measured and the return loss is back calculated. 2. Enter VSWR, Reflection Coefficient, or Return Loss to calculate remaining values. The corresponding value in the right column is the return loss value. Example 2. This can be built into a FLEXI-BOX and a transmission line PCB is available which easily adapts for this circuit with one simple trimming operation. This site comprises a comprehensive array of tutorials and related tools, including explanations, examples, references and charting. The VSWR/return loss calculator from Pasternack will find VSWR, return Loss, mismatch loss, and the reflection coefficient given any one of the listed input types. vswr-rl変換する計算ツールです。 イノベーションtop; 研究開発の実績; 博士の電波講座; アンテナ作りのこだわりVSWR Calculator. from Forward and Reflected Power: Transmitter Forward Power : Watts: System Reflected Power : Watts: VSWR = Reflection Coefficient = Return Loss = dB: Match Efficiency = % Net. Just enter the value of source return loss, input return loss, output return loss, load return loss, device gain, and isolation then the calculator will compute the minimum and maximum gain. Follow the discussion. Calculates the resistor values, attenuation, 'impedance', reflection coefficient, VSWR and return loss of a Pi attenuator. Despite Equation [Math Processing Error] 10. 155 dB. 50:1, with a corresponding return loss of 3. 224 X=-14. 46 2. การใช้งาน vswr: หน้าที่หลักของ vswr : เสาอากาศส่งสัญญาณ: อัตราส่วนคลื่นนิ่งของแรงดันไฟฟ้า (vswr) เป็นตัวบ่งชี้จำนวนค่าที่ไม่ตรงกันระหว่างค่า ante nna และ. 3 dB. Title: dg03-110. Elite RF. Just enter the value and click calculate. offices email call. voltage standing wave ratio. Calculate VSWR from Forward and Reverse Power. Simply select the quantity of convergence points, adjust the length and select the cable from the menu to create a bill of materials will be generated - showing the minimum amount of items required to configure a system. A 2-port device has two distinctly interesting. 0 is the minimum. You can use it for free. A table of convenient values are presented at the bottom. VSWR is determined from the voltage measured along a transmission line leading to an antenna. Use the S11 value in the calculator above to find the equivalent VSWR. VSWR to Return Loss (dB) Calculator. The term ‘forward power is synonymous with powered deliver to the load, or thru power. Return Loss (dB) = 10 x Log ( Pr / Pf ) Match Efficiency (%) = 100% x (1 - Pr / Pf)The VNAs with math modes can also directly calculate and display the resulting VSWR value. 5dB loss per 100 feet at 146 MHz). This is described in more detail on a separate page. But the meter at the transmitter will show a VSWR of 1.