Same-day shipping if you order in the next hours!Pasternack has created 27 new RF calculators that were developed by the engineering staff at Pasternack to provide the users and buyers of RF components a valuable and easy-to-use resource while in the planning or designing phases of their projects. Lambda = The wavelengh of the Antenna in meters. The free space loss here depends upon the distance from the transmitter to the receiver and wavelength (or frequency) of operation. . 6-3. Pasternack Publishes New RF Calculators and Conversion Tools to Pasternack. 7/21/2014. Following equation or formula is used for RF budget calculator. 3 GHz to 2. Additionally, these models support a frequency range of DC to 6 GHz and are CE and RoHS compliant. Step 3: Calculation of the Effective length. 2) gives the power delivered to a conjugate-matched receiver in response to a distant transmitter, assuming co-polarized antennas and free space conditions. For example, if you wish to input "25000000", just type "25M" instead. The Tee attenuator (T-pad) is a specific type of attenuator circuit which resembles the shape of the letter "T". The calculator shown below uses Wadell’s equations for differential impedance, which can be found in the seminal textbook Transmission Line Design Handbook. 10 -3. Test and Measurement. Patch Antenna Calculator or experimental formulas [1]. 7 Antenna Diameter = 4. Bookmark or "Favorite" this inductance reactance. Enter your cable length and click “Create My Cable Assembly”. A bridged T (Tee) attenuator can be thought of as a modified Pi attenuator. Irvine, CA - Pasternack Enterprises, Inc. 1 step (for AC), then press the Calculate button to get the result in volts (V). Our step attenuators are available in 50 Ohm and 75 Ohm impedance. 417 1. The tee (T) attenuator (pad) formula in the calculation for resistor values is measured in Ohms. Due to the three-dimensional propagation of radar waves, frequency hold the highest weight in determining range. These LL test cables from Pasternack are made with PE-P300LL coax, which operates at higher power with improved phase stability when compared to standard. To use this calculator, simply input your microstrip geometry and Dk value, and the tool will return the differential impedance value for a pair of microstrip traces. USA & Canada (866) 727-8376 International +1 (949) 261-1920. Power Divider by Pasternack Enterprises Inc ( 113 more products) Request Quote. Pasternack Publishes New RF Calculators and Conversion Tools to Pasternack. **Note: All of our calculators allow SI prefix input. Bulk quantities shipped same day. Wireless Converters and Calculators. This calculator utilises the diameter of the reflector and the operating frequency to calculate critical antenna characteristics such as gain, HPBW, and. Supporting engineering students and faculties with the RF components, tools and resources needed to educate the next wave of innovators. milli. Pasternack Releases New High Isolation RF Switches. Pasternack Publishes New RF Calculators and Conversion Tools to Pasternack. Rinner = hT − hR tan(ADT + θBW) 2 R i n n e r = h T − h R t a n ( A D T + θ B W) 2. INPUT DATA. Perhaps the most common type of transmission line is the coax. Thickness: Thickness of the microstrip conductor. About Us. dB. Reach out to us. See the quick-reference table below for. If performing the calculation by hand, then linear units need to all be the same. Pasternack's RF calculators and conversions section provides engineers valuable and easy-to-use tools ranging from complex mathematical formulas to simple conversions. 85 GHz. Pasternack's Stripline Impedance Calculator uses the dimensions of the stripline, as well as the dielectric constant, to compute the characteristic impedance. A tank circuit refers to an LC circuit in which the inductor (L) is placed in parallel with the capacitor (C). Pasternack Publishes New RF Calculators and Conversion Tools to Pasternack. Most of these new surge protectors are IP67-rated for outdoor. IEEE defines it as "The loss between two isotropic radiators in free space, expressed as a power ratio. It is intended only as a very crude estimate, as I. Pasternack carries a huge selection of microwave parts, RF parts, cables, connectors, modulators, adapters, attenuators plus much more. Pasternack Publishes New RF Calculators and Conversion Tools to Pasternack. Please note that this. **Note: All of our calculators allow SI prefix input. The microstrip calculator determines the width and length of a microstrip line for a given characteristic impedance (Zo) and electrical length or vice versa. Our manufacturing facility certified to ISO 9001:. The simple calculation is based on the following formulas: Proof test coverage is not taken into account. Pasternack is a Infectious Disease Specialist in Boston, MA. Visit Pasternack's RF coaxial attenuators page for product details. Gain. Welcome to the Broad River Rehab MDS Calculator! With this calculator you can explore how different items in the MDS effect reimbursment. Pasternack RF limiters are broadband passive devices used for receiver and component protection and are also used for power leveling applications. 18 0. 7/21/2014. Call us toll free at 1-866-PASTERNACK (1-866-727-8376) in the US and Canada only • All others please contact us at +1-949-261-1920 International • Or Email us at. There are several common types of planar transmission lines: stripline, suspended stripline, microstrip, coplanar waveguide, slotline, and imageline, of which there are also variants. A microstrip is a type of transmission line in which a strip of a conducting material like copper is mounted on a dielectric material and routed to a ground plane. These calculators and tools help engineers design more accurately and faster. The most Pasternack families were found in USA in 1920. Edge Coupled Stripline Differential Impedance Calculator. The substrate parameters (ε r and h) are required. The important thing in radios is not the signal strength, but rather the. com focuses on products and tools developed by Silicon DSP Corporation for Radio Propagation in Irregular Terrain as well as Propagation through the Ionosphere. **Note: All of our calculators allow SI prefix input. 318 1. This calculator is designed to calculate the characteristic impedance of a symmetric stripline - a flat conductor between two ground planes whose distance between the conductor and the planes is the same for both reference planes. Step 1: Calculation of the Width (W) -. Frequency GHz MHz: Distance: Path Loss *Note. < VSWR, Return Loss, Insertion/Transmission loss vs. . Pasternack Introduces New Series of Low PIM Cable Jumpers. This is a valuable tool for clinical decision-making, offering the prospect of tailoring diagnosis and therapeutic interventions to each patient’s molecular profile. Find Dr. , an industry-leading manufacturer and supplier of RF, microwave and millimeter wave products, has created and published a new set of RF calculators and conversion tools to assist engineers. The cut-off frequency of the coaxial cable represents the maximum upper operating frequency of the cable. Pasternack's Reflection Attenuator Calculator allows you to determine the two possible resistor values (R1 > Z0 & R1 < Z0) for a reflection attenuator (measured in Ohms). View the. 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. Pasternacks's Power Ratio Conversion Calculator converts from a power output-input ratio to a dB ratio measurement. A tank circuit refers to an LC circuit in which the inductor (L) is placed in parallel with the capacitor (C). Coaxial Cable Impedance Calculator. Toll-free: 866-PASTERNACK (866-727-8376) Customer Testimonials 60 GHz Systems and RF Filters RF/Microwave Calculators & Conversions. Enter the source characteristic impedance and the load impedance then press "Calculate" below. Mismatch Loss (dB) 3. Bandwidth Calculator & Max PCB Trace Length Calculator. 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. Wavelength. The differential. In some cases, users require a custom impedance value. Pasternack offers a huge selection of microwave parts, RF parts, cables, connectors, modulators, adapters, attenuators and more. A simple tool to calculate parameters for an edge fed/inset fed/probe fed patch antenna or microstrip antenna. Our broadband waveguide horn antennas have frequency capabilities ranging from 1. When looking at noise figure (NF) calculator output, it measures degradation of the signal-to-noise ratio (SNR), caused by components, such as amplifiers, in an RF signal chain. Printed Circuit Board (PCB) RF Microstrip Calculator with Formulas. 8/20/2014. Feb 12-Jul 12, 2024: RF Certifications Online, Besser Associates Online Academy. Description. If a polarization is circular, enter 0 for the dB axial ratio and 0 for the tilt angle. This calculator helps you determine the values of the resistors R1 and R2 to be used for a Pi Attenuator. The calculator shown below uses Wadell’s equations for differential impedance, which can be found in the seminal textbook Transmission Line Design Handbook. WR-28 to WR-430 sizes available. Thank you for your support. The Pasternack family name was found in the USA, and Canada between 1880 and 1920. D is the inside diameter of the coax cable shield,. Overview. It includes a Coaxial Cable Loss Calculator with pre. 06 29. 37 km Over Horizon Over Horizon 1 0. Pasternack Releases New High Isolation RF Switches. Most of the microstrip impedance calculators you’ll find online use a similar process: enter your microstrip geometry and Dk value for your PCB substrate materials, and the tool will return the impedance for your microstrip trace. Created Date: 2/21/2013 3:44:44 PMOn the one hand: just add the numbers. Pasternack carries a variety of panel and patch antennas which can be seen here. The Coil32 for Android and the cross-platform Coil64 makes it possible to calculate the self-capacitance and Q-factor of the. ([email protected]. com, techsupport@pasternack. Pasternack Pasternack Blog Impedance Calculator. Pasternack Introduces New Lines of Attenuators and RF Loads Operating to 65 GHz. We maintain inventory of more than 35,000 products that are always available and in-stock which gives you access to products ranging from the rare, hard-to-find specials to. Line of Sight Calculator; Parabolic Reflector Antenna Gain; Follow Us: QUICK LINKS. Free-space path loss. Antenna Downtilt and Coverage Calculator Pasternack . $101. Distributed Inductance (L') For a coaxial cable, the inductance per unit length L' in henries per meter (H/m) is defined as. Welcome to Pasternack's RF Institute. Tags: Module with Connectors, Wilkinson Power Divider. com, techsupport@pasternack. Pasternack Introduces New Series of Low PIM Cable Jumpers. Centered Stripline Impedance Calculator. These equations are. Bulk quantities shipped same day. For inquiries, Pasternack Enterprises, Inc. The frequency range of our step attenuators is from DC to 2 GHz and includes low to high power attenuators which have the power handling up to. INPUTS Dielectric Constant, Ε r: Trace Width, w in mils : Trace separation, d in mils : Trace thickness, t in mils : Dielectric thickness, h in mils : OUTPUTS Characteristic impedance in Ohms : Differential microstrip impedance in Ohms : *Note: This calculator is valid for (W/h) in range from 0. Pasternack Releases New High Isolation RF Switches. Consiltant BV developed PFD Consiltator, an Excel based tool in order to calculate the PFD avg. How is link margin calculated? It can be calculated as follows. Please visit to begin using them now. 254 millimeters and the Operation Frequency is 24Ghz. Coplanar Waveguide Calculator. Return Loss and Mismatch Loss Calculator. Try Them Out. Our LMR-400-DB coax is constructed with a 0. Go to "Contact Us" Page. Pasternack Introduces New Series of Low PIM Cable Jumpers. This value is usually calculated by discounting any obstacles or reflections that might occur in its path. The calculator requires you to input any two of the following three parameters: wave speed, frequency (or wave period) and wavelength. 10 -3. LMR-400-DB coax cable has an attenuation at 1 GHz of 4. Available for same day shipping. For example, if you wish to input "25000000", just type. Pasternack’s Coaxial Cable Impedance Calculator allows you to enter the Outer Diameter Dielectric width, Inner onductor Diameter width and either the Dielectric. You can read more about Friis Transmission Equation Calculator using below link. Parabolic dish is widely used as satellite TV channel receiver across the world. The Friis transmission equation (Equation 10. of RG58. 8/20/2014. Parabolic antenna calculator example: INPUTS: Frequency = 14. Our wavelength calculator tool uses the given frequency and dielectric constant/velocity of propagation (VoP) of the RF input signal. Transmit and receive antenna gains (Gtx & Grx). Pasternack's RF Calculators and Conversions section provides engineers valuable and easy-to-use tools ranging from complex mathematical formulas to simple conversions. Fig. Noise figure to/from noise temperature calculator from Pasternack will produce either noise figure or noise temperature, depending on the input type. The RX-888 (Mk2) has two mechanisms for adjusting gain and attenuation: The PE4312 attenuator . See the quick-reference table below for all compatible SI prefixes. 14. Gain. Typical numbers are used: Center Operating Frequency: 915 MHz (902-928) Path Length: 1. The microstrip patch antenna calculator determines the length (L) and width (W) of a rectangular microstrip patch antenna for a given resonant frequency or vice versa. Coaxial cables and coaxial connectors can reach into the millimeter wave frequencies but as the physical dimensions shrink, power handling capabilities are reduced and losses increase. m. For example, if you wish to input "25000000", just type "25M" instead. 5 dBi Gain N Female In put Connector ships worldwide from the. The gain of the antennas offsets the loss by a certain decibel value. Pasternack PE3087 BNC male to BNC male cable assembly is constructed. Tee (T) attenuator calculator from Pasternack allows you to determine the resistor values (R1 & R2) for a the RF component. Pasternack bridged Tee RF attenuators are very useful whenever you need to reduce the signal level without changing the circuit's impedance. com. RadioCalc. See the quick-reference table below for all compatible SI prefixes. In fact, striplines often make components such as band-pass filter's more accurately, with more symmetric roll-off and no lower cutoff frequency. In both cases, you’ll need to enter your stackup information into the calculator to get accurate results. A group of engineers at Pasternack developed 27. The substrate parameters (ε r and h) are required. RF Link Budget Calculator This radio link budget calculator tool lets you quickly compute the Free Space Loss, Received Signal Strength, Fade Margin, Distance and more. Pasternack's Power Density Calculator is designed to give the power density, in Watts per square meter, at a given distance, output power and antenna gain. Our cables are designed to fit a wide range of performance. Supporting engineering students and faculties. While commonly constructed using printed circuit boards, this structure can also be built using other materials as long as there is a conductor separated from. If only two terminals are used, on. , an industry-leading manufacturer and supplier of RF, microwave and millimeter wave products, has created and published a new set of RF calculators and conversion tools to assist engineers with answering complex RF-related product and design questions that arise on. The PE2092 from Pasternack Enterprises Inc is a Power Divider with Frequency 690 MHz to 2. Antenna -> PSA4-5043+ LNA, +20db wide band, NF less than 1db -> Band pass filter, usually made or chosen (if bought) to be as narrow as possible for the application -> PSA4-5043+ LNA -> +30db LNA made from removing filter and patch from an active GPS -> Downconverter if S band -> Airspy Mini SDR. In terms of how these calculators work, the impedance of a transmission line in a PCB can be calculated in four ways: Use the R, L, C, G parameters from the Telegrapher’s equations to calculate the impedance of the transmission line. 727 p asernaom 50 Ohm Conversion Table dBm V Po dBm V Po dBm mV Po dBm µV Po +53 100. So, let’s take a step-by-step look at how to get your cascade analysis rolling. e the transmitting and receiving end, then the FSPL would just be a factor of the frequency and distance. Pasternack Enterprises’ new low loss test cables utilize a specially designed 0. The substrate parameters (ε r and h) and the frequency of interest are required. 7/21/2014. Pasternack RF isolators are passive 2-port microwave devices that help protect radio frequency components excessive current or signal reflection. 7 GHz to 40 GHz depending on. at (91) 80 252 00383. EIRP, or effective isotropically radiated power, or equivalent isotropically radiated power, is a measurement of output power in one direction from an ideal, one dimensional source. Relative Dielectric Constant ( εr ): Track Width (S):. d = Path Length of Two antennas. Convert from. Microstrip line is a widely used transmission line and for the appropriate transmission its characteristic impedance has to be calculated while using it in RF design & circuits. TOOLS. Free Space Path Loss Calculator. 10 -3. The microstrip is a very simple yet useful way to create a transmission line with a PCB. /. Result: **Note: Like our CRA calculator, all of our RF calculators allow SI prefix input. This is based on the height, dielectric constant of the dielectric and the calculated width of the patch antenna. Pasternack's CRA Calculator finds capacitance, reactance, and admittance given the operating frequency and either the. The coaxial cable, along with the balanced two-wire, is the most common type of transmission line used in RF communications. This calculator helps you calculate the characteristic impedance of a coaxial cable given its dimensions. The calculator will output the characteristic impedance, cut-off frequency, capacitance per unit length, inductance per unit length, and velocity of propagation in. **Note: Like our bridged tee calculator, all of our RF calculators allow SI prefix input. Pasternack. We maintain inventory of more than 35,000 products that are always available and in-stock which gives you access to products ranging from the rare, hard-to-find specials to. 4dB: 0. This is (more or less) right at the HF antenna input and it can be adjusted to. Pasternack Enterprises, Inc. Pasternack carries a huge selection of microwave parts, RF parts, cables, connectors, modulators, adapters, attenuators plus much more. Our RG223 coax is constructed with a 0. For example, if you wish to input "25000000", just type "25M" instead. Pasternack Enterprises. trace geometry, and use this to calculate. Pasternack's RF calculators and conversions section provides engineers valuable and easy-to-use tools ranging from complex mathematical formulas to simple conversions. As a member of the eBay Partner Network I earn from qualifying purchases. Just enter the given values for trace thickness, substrate heights, trace width, and substrate dielectric. 12 0. About Us. It is very useful in RF system link budget calculation and analysis. Link Budget Calculator provides a signal loss and gain budget based on the user-defined link availability required given as a percentage of time due to path fade statistics. 7/21/2014. PFD Consiltator can be downloaded here. Pasternack Introduces New Series of Low PIM Cable Jumpers. Taking a limit, we obtain. Pasternack's Coaxial Cable Impedance Calculator allows you to enter the Outer Diameter Dielectric width, Inner onductor Diameter width and either the Dielectric Constant or Velocity of Propagation (VoP) values in order to calculate the impedance of the coax. 009. 0 50WThe stripline impedance calculator provided below is useful for gaining an initial estimate of trace impedance for striplines. Panel and patch antennas from RF and microwave component international supplier and manufacturer Pasternack Enterprises. Pasternack's Microstrip Calculator computes a microstrip's height/width ratio,. 225m s = 2mm. 05 30. Note: If you select a waveguide size from the dropdown below, the broad wall width will be automatically calculated. The Power Added Efficiency of an amplifier is the ratio of produced signal power (difference between input and output power) and the DC input power for the amplifier. . For example, if you wish to input "25000000", just type "25M" instead. It shows values for a seemingly simple real-world path. Access the. For example, if you wish to input "25000000", just type "25M" instead. Ensure every “Select” box is checked next to each connector and cable parameter. Our pi attenuator calculator is designed to aid you in calculating the correct values of the resistors R1 and R2, according to the diagram below. By understanding the microstrip transmission line, designers can. 5 GHz, Diameter = 3. Provide the value of the inductance (nH) or reactance along with and the frequency of operation (GHz) in the equation. 11Watts to Volts calculator. Hits: 6396. [email protected]'s RF calculators and conversions provides engineers valuable and easy-to-use tools ranging from complex mathematical formulas to simple conversions. Pasternack Microstrip Calculator Pasternack Wavelength Calculator SystemC TCL/TK. Enter the power in watts (W), current in amps (A), select power factor (PF) from 0 to 1 with a 0. Best HF Antennas for 2023. 0 80W +48 58. The slides cover topics such as RF components, transmission lines, antennas, and modulation techniques. Free Space Path Loss assumes the space between the two antennas is an obstruction free, line-of-sight straight path through the air. Applied RF Engineering I - Circuits and Transmission Lines. It shows a range of 2. ½ cup fat-free milk. 7 GHz, Insertion Loss . 28 (800) TMS-COAX • LMR-600 TIMES MICROWAVE SYSTEMS Ideal for… • Jumper Assemblies in Wireless Communications Systems • Short Antenna Feeder runs • Any application (e. Offer components for short open load calibration technique -or- short open load and thru method. 2 10. A microstrip is a type of transmission line in which a strip of a conducting material like copper is mounted on a dielectric material and routed to a ground plane. For instance, say we're working at a wavelength of 2 meters. Coaxial cables are extremely useful transmission lines as the coaxial nature of the transmission line provides relatively efficient transmission from DC to a cut-off frequency, which is a function of the geometries of the coaxial components of the cable. Watts to Volts calculator. Enter VSWR, Reflection Coefficient, or Return Loss to calculate remaining values. These equations are. Pasternack's Circular Waveguide Calculator will calculate the cutoff frequency for the device from its radius. Step 5: Calculation of actual length of. 5 GHz, RF signal power tappers frequency range of up to 2. For example, if you wish to input "25000000", just type "25M" instead. For our design, the Dk is 3. If a polarization is linear, enter 60 for the dB axial ratio and R for the rotation sense. By carefully stacking two of them 0. The Calculator comes with an integrated Operator’s Manual to provide activation instructions and selected details of parametersRF power combiners from Pasternack are offered in the popular 2-way and 4-way configurations and deliver high power up to 600 Watts and operate over a broad temperature range between 55°C to 85°C, expanding the versatility of this product offering to a wide range of military and commercial applications. I then took the probe case apart, removed the red&black cables and applied signal directly to the gold connectors on the PCB. Pasternack's Coaxial Cable Loss Calculator will produce insertion loss, as well as nominal delay, average power, and velocity of propagation (when information is available), given an input frequency and run length. 8/20/2014. Our type N male termination load is a rf load termination with a 50 Ohm impedance. About Us. Pasternack's Circular Waveguide Calculator will calculate the cutoff frequency for the device from its radius. Where: ADT A D T = antenna downtilt in degrees. Pasternack Introduces New Lines of Attenuators and RF Loads Operating to 65 GHz. Be The First To Know. Microstrip line impedance calculator Microstrip Mitred Bend calculator Microstrip Width calculator dBm to Watt converter Stripline Impedance calculator Microstrip line impedance Antenna G/T Noise temp. INPUT DATA. Don’t forget to check out our other. Pasternack RF circulators are passive 3-port microwave devices which control the signal direction and flow inside of an RF circuit. Pasternack spectrum and VNA network analyzer cables, SOLT. where. 0 200W +50 70. 10 -3. As an example, your 500mW (27dB) transmitter is putting out 1dB less than it should (26dBm, or 400mW), what effect does that have on range? Answer: 0. Antenna linksSince 1972, Pasternack Enterprises, Inc. 118 mm, the length is 3. Refer following calculators on microstrip line useful for various calculations. (sales@pasternack. This coaxial cable cutoff frequency calculator that helps the user to calculate the cutoff frequency of a coax cable based on outer and inner conductor. Pasternack Introduces New Lines of Attenuators and RF Loads Operating to 65 GHz. Pasternack Releases New High Isolation RF Switches. com, 866-727-8376 US and Canada or +1-949-261-1920 International. RadioCalc. As you adjust the width of the line, you can eventually get the microstrip impedance calculator to converge on. Often, power consumption and range must be balanced for maximum usability. Free Space Path Loss is used the calculate the attenuation (reduction) of signal strength between two antennas. 6 ounces fat-free plain Greek yogurt. As you adjust the width of the line, you can eventually get the microstrip impedance calculator to converge on. A simple, but quite useful calculator, to determine how many times further your RF link can go given a number of dB increase (or decrease) in power. Pasternack's Power Density Calculator is designed to give the power density, in Watts per square meter, at a given. N-Way Power Divider Calculator Pasternack. Coax Impedance (Transmission Line) Calculator. dB. You may enter custom values, or choose from a list of commonly used materials. Calculates the Free Space Transmission Loss (FSTL) between two antennas based on: Transmit power. The Pi attenuator consists of a series resistor and two parallel resistors, which are grounded at the input and output. Please note that this calculator is only valid for far-field calculations. The edge couple differential symmetric stripline transmission line is a common technique for routing differential traces. 0. 727. The Power Added Efficiency of an amplifier is the ratio of produced signal power (difference between input and output power) and the DC input power for the amplifier. Here's how: Select your connectors and cable type using the parameters listed below in any order you prefer. A total of 27 RF calculators. 0 64W +47 50. 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. 07 28. PE51083. The Pasternack tank circuit (also known as LC circuit, resonant circuit or tuned circuit) resonance calculator uses the simple formula (below) to calculate the system's resonant frequency. You may enter custom values, or choose from a list of commonly used materials. Pasternack's Skin Depth Calculator returns skin-depth as a function of a material's resistivity and permeability, as well as the application frequency. The IPSS-M is an MDS prognosis calculator that combines genomic profiling with hematologic and cytogenetic parameters, improving the risk stratification of patients with MDS. c = Speed of light in vacuum (Meters per Second) * All conversions are based on free space conditions (impedance of 377 ohm)Friss, free space path loss calculator. Pasternack's phone number, address, insurance information, hospital affiliations and more. Components and Cable Assemblies. Pasternack Publishes New RF Calculators and Conversion Tools to Pasternack. RF calculations and RF conversions include metric. Pasternack's Free Space Path Loss Calculator calculates the loss (in dB) between two antennas where the gain, distance and frequency are known.