Ham radio coverage calculator. This shows how to derive the answer to Fig.
Ham radio coverage calculator. 2 Meter APRS Propagation .
Ham radio coverage calculator Potential Coverage Map of the Repeater by RadioMobile. 04: Enter Manufacturers cable loss in db per 100 feet. About DXZone. Joined Dec 19, 2002 Messages 11,380 Location Wichita Falls, TX. In the Friis Equation, the factor which affects the strength of a radio wave received at some distance from the transmitter is The Effective Isotropic Radiated Power (EIRP) is the apparent power transmitted towards the receiver, if it is assumed that the signal is radiated equally in all directions, such as as a spherical wave emanating from a point source; in other words, the arithmetic product of the power supplied to an antenna and its gain. Links:Radio Mobile Online: https://www. The Voice of America Coverage Analysis Program Mobile Ham Radio Concepts. ERP, Line Loss and Various Calculators, Antenna Voltage and Current and Feedline Voltage and Current. ARRL. Other licensing available on Whether you’re a seasoned amateur radio operator or just getting started, the random wire antenna is a reliable and cost-effective solution for achieving clear and strong signals. This map shows real-time radio propagation from stations operated near 144 MHz. The antenna downtilt and coverage calculator (also known as 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. Two terrain databases are available here: the FCC's legacy 30-second terrain database, and the GLOBE 1 km Base Elevation database from the National Geophysical Data Center. Cite. Setting up; Operating; Antennas; EMC considerations; Watch. If you are wondering what Amateur Radio is about, it's basically a two way radio service where licensed operators throughout the VOACAP Online for Ham Radio offers free high-frequency propagation prediction software for amateur radio enthusiasts. If you want to calculate the Frequency from Wavelength - Click here to use the Wavelength to Frequency Calculator. Note that buildings and other obstructions is not For the 1st station, the Radio Horizon is away. λ (Lambda) = Wavelength in meters. If you are wondering what Amateur Radio is about, it's basically a two way radio service where licensed VHF Propagation Map. with news, information and resources. DXMAPS doesn't make use the VOACAP on-line scripts, but it runs its own calculations using the For a Radio Coverage study, a colored plot over a topographical map is produced. This shows how to derive the answer to Fig. The same is true for radio waves. To use the calculator, enter your transmit peak-envelope power (PEP) and operating mode, and answer the questions about the maximum amount of time you might be transmitting. I always have hard time calculating the offsets for repeaters so I made this tool: To calculate the length of an EFHW antenna, divide 468 by the frequency in MHz. Define Radio Systems with predefined settings and gear to quickly create Coverage Maps. For a radio tower with a height of 100 meters, the radio distance is calculated as follows: Repeaters Frequency Calculator. I'd like to see rougthly what coverage I could get. S. Values for antenna height above average terrain (commonly abbreviated "HAAT") can be calculated using this form. Paths are smoothed to create a color-coded footprint indicating the distance VHF signals are Radio Propagation & Diffraction Calculator This is a radio frequency propagation calculator for the transmission path between an RF transmitter and a receiver. It doesn’t need to be difficult, but you have to start with the right understanding. Understanding Frequency and Wavelength Radio frequency line of sight is defined by Fresnel Zones which are ellipse shaped areas between any two radio antennas. These tools are part of the new Nautel RF Toolkit, available free online at the website www. Although this online calculator is intended to assist with designing and building homemade, ham radio loop antennas for use in the HF bands, magnetic antennas have been constructed that function in the VHF or even the UHF frequencies. 65 GHz, and 5 GHz coverage areas quickly. Conversion; you can optimize your communication systems for better coverage and signal clarity. Astronomy: Telescopes, astrophotography equipment, and optical accessories. 3 Element Yagi Antenna Calculator. Reactions: JamesBrox and buddrousa. The calculators also calculates the radio horizon. The calculator then spits out estimated power consumption and cost estimates in dollars. View several coverage maps in one Google Maps screen! Radio Systems. That gives a scalar that is more convenient to calculate with than a complex . 5 MHz and possibly supplanted by 7 MHz. For a perfect sphere without any mountains, the distance d₁ from a transmitting antenna to the horizon or the line of sight, or radio horizon, can be calculated from the Pythagorean theorem (see the picture above):. Keep this site on-line This index page is licensed under a Creative Commons Attribution‑NonCommercial‑ShareAlike 4. Although commercial use is not prohibited, the author cannot be held responsible for its usage. The most powerful radio service available. The most common material for home building small ham radio loop antennas is common copper plumbing pipe. [Return to JavaScript Collection | Return to Homepage | Return to Amateur Radio Page] Satellite Look Angle Calculator; Online VHF UHF Coverage Maps by Roger Coudé, VE2DBE; Home; 5. Calculator Doc. 0 International License. I know radio coverage can never be 100% guaranteed per-se, however, I've been tinkering around with the software tonight. 0 Standing Wave Ratio (SWR) last updated 23 February 2025. Regularly calculating radio distance helps in maintaining efficient and User-friendly interfaces designed for busy humans with options for all radio technologies from HF to SATCOM. And, the impedance and reactance are perfect! Below is a quarter wave ground plane antenna I made for 23cm, 1296MHz which is made from off-cuts of household mains copper wire and a scrap BNC socket from the junk box. It is a graphical representation of MUF within a 3000-kilometer range, allowing amateur radio station operators to estimate the best frequencies and paths for effective communication. The home of the online HF propagation prediction tool, 'proppy', providing on-demand point-to-point and area predictions using the ITU's ITURHFProp application in accordance with ITU-R P. It will calculate either short path or long path. SCADACore's Industry 4. JavaScript must be enabled to use see the real-time graphics. Since radio waves behave much like sound waves, we can draw a parallel here. N. By offering a visual snapshot of the current ionospheric conditions, these maps empower users to make informed decisions about optimal frequency selection and propagation paths. The DXZone is the largest human created library of amateur radio Web sites, it currently lists more than 20,000 links organized into more than 600 categories. MCS. There are plenty of resources on the web. This page minimizes all the clicking, scrolling, and popups but still uses all of Typically, the azimuth angle coverage of a directional HF radio antenna is around ±40° to ±50° for normal 2-3-5 element Yagi, 2-3 element Cubical Quad, etc. 5625 (GMRS freq) which will not give a noticeable difference. Radio Mobile Online is a popular tool to use. The image above illustrates the steps required to determine the antenna coverage Voice of America Coverage Analysis Program VOACAP. (Using a combination of the two bands to achieve full coverage is perfectly acceptable. It assumes there is nothing between To generate an RF coverage map using Radio Mobile Online, all you need to do if follow the three easy steps below. The distance between the two radio antennas and the frequency of operation are required to compute the radius of the Fresnel Zone. 500MHz. Today we serve customers worldwide, including I'm planning on setting up a low-HF antenna for near to mid-range contacts. If you are wondering what Amateur Radio is about, it's basically VHF Propagation Map This map shows real-time radio propagation from stations operated near 144 MHz. The American Radio Relay League (ARRL) is the national association for amateur radio, connecting hams around the U. Adjust zoom, as necessary, to more clearly see the black coverage perimeter. Coax Loss Calculator; Contests; Digital Radio. rf wavelength calculator . 3, I refer you to the RSGB book. (or less) due to reflection, refraction, and atmospheric conditions. So, I went ahead and added my base, mobile and portables to the system I am working on and inputted all values including coax line loss, antenna gain (if any, or negative in this case for portables), antenna height, etc There is more incorrect information and wrong thinking about impedance and SWR than just about any other topic in ham radio. See where your radio signal gets out and plot paths between radio stations with this free tool by Roger Coudé VE2DBE. Skip to content. v The Minimum Detectable Signal or Receiver Sensitivity at 7. Test Different Scenarios Create Colorful Maps Answer Questions like How far is my transmitter signal going to go? How much power for my desired radius? What These tools are part of the new Nautel RF Toolkit, available free online at the website www. RadCom Basics; Alex Discovers Amateur Radio; Search Radio Mobile is dedicated to amateur radio and humanitarian use. 8 and 54 MHz in the amateur radio service. “Our systems are busy rendering How to calculate Grid Square from Lat/Long: The good news is that you don [t have to. 533-14. Calculate dimensions for a 3-element Yagi antenna with our easy-to-use calculator. This index is taken daily at 2800 Mhz. Amateur radio operators, military communications, and organizations that rely on This line of sight calculator calculates how far the horizon is from an antenna placed at a particular height. Historical Background. Here is a simple line of sight calculator that will do the complicated math for you to determine just how far the horizon is from your HT or your base station antenna at any height above level and High Frequency (HF) propagation calculators are tools for estimating and forecasting radio wave propagation. The accuracy of calculation is Antenna Coverage Distance = 3147 meters; Antenna Range Calculator Equation. Hamic has a simple to use, but powerful graphical interface that allows solving simple circuits such as resistors in series or Create 900 MHz, 2. This radio line-of-sight distance calculator determines the line-of-sight distance between the transmitter and the receiver. VOACAP is free professional high-frequency (3-30 MHz) propagation prediction software from NTIA/ITS, originally developed for Voice of America (VOA). Computers: Custom PC builds, gaming computers, and ready-to-go PCs. For the 2nd station, the Radio Horizon is away. 4 GHz, 3. C4FM and WiRES-X; D-Star; DMR Repeaters c-Bridges and Networks; DMR Reflectors; Ham Dashboard is a free HTML single page dashboard by Pablo, VA3HDL. DMR in Australia; Three Digital Radios – The Good, The Bad and the Ugly. It is designed for the Ham radio hobbyist, but may be useful to others as well. The database has a resolution of 30 arseconds and was derived from SEDAC - Columbia University. It uses data gathered by Automatic Packet Reporting System-Internet Service (APRS-IS) from packet stations in the amateur radio service. 02: Enter Manufacturers Duplexer Loss in db. Just a quick update about new tool I created recently. MultiCoverages. . \$\endgroup\$ – SpecialAgent VOACAP (Voice of America Coverage Analysis Program) is a radio propagation model that uses empirical data to predict the point-to-point path loss and coverage of a given transceiver if given as inputs: two antennas (configuration and position), solar weather, and time/date. Create for any frequency other than 88-107MHz "FM Band". The J-Pole antenna is a type of omnidirectional antenna widely used in amateur radio, especially for VHF and UHF bands. Each repeater has its own potential coverage map, which can be activated on request and superimposed on the map where ham radio operators were also invited to the author of “Radio Mobile”[1] to provide simple, fast online VHF/UHF coverage mapping and point to point analysis worldwide. Follow asked Jul 26, 2011 at 23:34 question came up while discussing a research project and how we could transmit data from a site without reliable cell coverage. This calculator assumes nothing is in the way of the radio signal between the antenna and the SignalServer is a simulation that can provide insight into geographical coverage of a transmitting system. The formula and example are provided for easy understanding. One of the best tools to forecast HF (high-frequency) propagation is the online map (chart) shown below. The Radio Coverage Tool is based on the Longley-Rice VHF/UHF “ITS” Here is a simple line of sight calculator that will do the complicated math for you to determine just how far the horizon is from your HT or your base station antenna at any height above level and flat ground (or calm water) on the VHF/UHF ham bands. The quality of that database varies from one country to another. Org HAM Radio Centralized Antenna Height of 1st Station (ASL) Antenna Height of 2nd Station (ASL) Feet Metres . The Standing Wave Ratio (SWR) is the parameter that is easiest for most hams to measure, as meters are very common, both built into many newer radios or as a shack accessory. Increased radio noise from the sun Extended Double Zepp measurements for all ham bands and online calculator The antenna is constructed By: WestMountainRadio Hits: 143 | Votes: 3 | Rating: 7 Folded Dipole Calculator; The DXZone is the largest human created library of amateur radio Web sites, it currently lists more than 20,000 links organized into more than 600 This page is intended for users that want to experiment with a yagi design but do notneed all the rhetoric contained on the main Yagi Design Page. Enter 0 if you don't have a duplexer: 03: Calculated Duplexer Power Loss in Watts. Since 2012, we’ve perfected our API for RF propagation. For 800 MHz, you can input 903 MHz which will be pretty close to 800 MHz coverage. I have seen people use tools that give estimates of a system's performance as it relates to an antenna/transmitter/receiver specific geographic coordinate, height, and power. Amateur Radio Software, by Morris. My only comments would be that you need to bump up the HamCalc v1. This antenna coverage and tilt angle calculator also provides, given a beam width, the inner and outer radii of beam's Type WA9TT-10 in the search box (lower left hand corner) to see my iGate coverage during the past hour. Statistics show that in the periode 2012 to 2015, 663304 studies have been CB radios, and some HAM frequencies, are in the HF (High Frequency) There is a formula for calculating distance to the horizon based on height, but it's a little technical (see section below "Calculating the Horizon"). The calculation assumes there are no obstructions (trees, buildings, etc. This map shows real-time radio propagation from stations operating on 11 bands between 1. In my particular case, ideally I would like to be able to cover a radius of approximately 1000-1200 km with good reliability, operating on 3. If you’re considering getting your ham radio license or you’re trying to choose a radio service that’s right for you, the answer is simple – amateur radio, also known as ham radio – has the longest range, most power, and most flexibility of any radio service that is available to the general public, once you get a license. The true terrain The calculator lets you plug in the measured efficiency of your current transmitter, if you have it, or the efficiency specs from the manufacturer or the published efficiencies of planned new transmitters. Welcome to Reddit's own amateur (ham) radio club. It’s easily configured and a great addition o any shack. Note that the dimensions of h, R and d It allows modeling of ham and GMRS frequencies. The result will be the length of the antenna in feet. Calculate the wavelength of a radio frequency (RF) signal using this online calculator. ) between the antenna and the horizon and does not take into account the Alex Discovers Amateur Radio; Search; Online propagation tools The RSGB’s Propagation Studies Committee has a number of online tools to help you work out the best band and time to make a contact Propagation tools available RadCom Tools. To use the RF Exposure Calculator, fill-in the form below with your operating power, antenna gain, and the operating frequency. 0 is a planning tool for: - Mobile networks: 5G (NR), LTE, UMTS, GSM, GSM-R, WCDMA - Public safety land mobile networks: P25, TETRA, DMR, dPMR, NXDN - Wireless IoT LPWAN networks: LoRa, SigFox - Precision agriculture systems - Terrestrial radio and television broadcast networks: ATSC, DVB-T, DVB-T2, ISDB-T, DTMB, DAB, DAB+ - Air-to-ground Calculate the maximum allowed power density and minimum safe distance in both controlled and uncontrolled environments. Radio Mobile is one of the best available online coverage calculators available - especially when you consider that it's Free to use (for amateurs). This tool is invaluable for amateur radio operators, emergency responders, and professionals relying on HF bands for communication. See calculator at Radio Horizon Calculator . The following equation or formula is used for the antenna range calculator. This page assumes that you have already read the information on the Yagi Design Page and understand what each of the text boxes and selectors are for. 3 HamCalc is a free collection of calculators for radio amateurs include Antenna ERP calculations, Attenuators, Audio Filter design, Coil Winding, Decibels, Great Circles map and calculator, HF Filters, HF Traps, Metric conversions OP Amps QRA Locator to Latitude/Longitude, Radio Horizon calculator, Resonance Satellite orbit calculator Timer The J-Pole Antenna Calculator is a tool designed to help ham radio enthusiasts and other radio operators to determine the optimal dimensions of a J-Pole antenna based on a specific operating frequency. This Use our link calculator to find out - it is easy to use and provides a great performance estimate using horn sector antennas. W6ELProp Predicts ionospheric (sky-wave) propagation between any two locations on the earth on frequencies between 3 and 30 MHz PropView What is amateur radio? FAQ; First steps; Your station. This is the minimum level required at the receiver. where. Calculate Your Repeater System Effective Radiated Power with W1AN's Calculator: 01: Enter Transmitter Watts Output Power to the Duplexer. Formula: λ = C/f Where,. FOURTH COORDINATE PAIR 53: Can anyone point me to a reference for calculating (estimating) the transmission distance of a 50-watt, 2-meter radio? ham-radio; Share. Use the μV to dBm calculator to calculate the equivalent -107 dBm amplitude. The calculator will give you the rotctl, part of the free cross-platform open-source package libhamlib-utils (hamlib) will not only calculate the distance and bearing, it will instruct a rotator to point there, though you don't have to have a real rotator to run it. The total line of sight distance is Miles Km. com, users will now have coverage maps for all repeaters on earth. nd5y Member. What is an Efhw Antenna? An EFHW (End-Fed Half-Wave) Antenna is a type of radio antenna commonly used in amateur radio. This enhances the efficiency and reliability of global GigaParts is the premier destination for the latest in technology products and hobby gear, catering to a wide range of interests: Amateur Radio: A variety of amateur radio equipment and accessories. Loaded with info for new ham radio operators! About Hamuniverse Antenna Designs Antenna Safety! Ask Elmer About Batteries Code Practice Computer Help Electronics Emergency Power! FCC Information Frequency Guide! Ham Hints - Humor Ham Radio News! Ham Radio Videos! HF & Shortwave License Study Links Midi Music Reading Room Repeater Basics Good for PtP links and for general RF coverage. Amateur radio: A 21st Century hobby; Amateur Radio: A World of Possibilities; GB1SS: schools speaking to Tim Peake; More RSGB videos; Read. RFinder has now announced that through a new strategic alliance with CloudRF. For the 1st station, the Radio Horizon is away. Hence, such antennas can often broadly cover an entire continent at DX distances without even having to swing the beam around for various QSOs within the region. Calculate the effective radio distance with our Radio Distance Calculator to optimize your communication range based on antenna height. For more information see: Radio Mobile elevation and landcover data sources; ITM model documentation; Popularity of Radio Mobile Online. receiver. However, in remote areas with no cell coverage these radios will not work. 569 \times \sqrt{H} \] where: \(RD\) is the Radio Distance in kilometers, \(H\) is the height of the radio tower in meters. Note that we have not used the Minimum Detectable Signal of -130 dBm in this calculation, as our interpretation from the specification is that it represents the noise floor of RadioPlanner 3. : No LoS. c = Speed of Light (299,792,458 m/s) f = Frequency. I have found The American Radio Relay League (ARRL) is the national association for amateur radio, connecting hams around the U. that is, the square root of ( R squared + X squared). 9 8 7 6 5 4-0. nautel. The Radio Coverage Tool is based on the Longley-Rice RF Line-of-Sight for Multiple Radios The RF Line-of-Sight tool allows users to easily drag-and-drop locations and obtain point-to-point line-of-sight information anywhere using Google Maps. This map is useful in planning and troubleshooting cellular networks for IIoT / SCADA monitoring applications. 49 MHz is 1. Broadband coverage: You can use online calculators For those people who want to convert "N" into -dB by calculator or computer instead of the graph at Fig. Hevener. The wireless coverage API . Online Technical and HAM Radio Related Calculators. The display shows worldwide activity from the last 15 minutes and is automatically updated about every minute. If you are wondering what Amateur Radio is about, it's basically a two way radio service where licensed operators throughout the world experiment and communicate with each other on frequencies reserved for license holders. h₁ is the transmitting antenna height above the ground,. LTE radios require cellular service, which It is designed for ham use and GMRS, but say you want to know the coverage of a UHF repeater, say, at 451 MHz while it won't let you select 451 MHz exactly, it will let you input 462. Nov 25, 2023 #6 Some online coverage calculators like scadcore The Ham Intelligent Calculator, also called Hamic, is a program designed to simplify a number of calculations commonly used by Hams. To calculate range, you would need to calculate pathloss, which includes penetration, reflection, and diffraction, ie. com. Cross-platform functionality with tips and videos to help you plan your network today, not next week. The outputs resulting from the program are under the entire responsibility of the user, and the user should conform to restrictions from external data sources. As one is distanced further and further from a sound's source, the sound one hears is weaker. Transmitter Performance Calculator - Coverage Map . The map shows activity from the past hour. R = 6371 km is the mean Earth radius. Example Calculation. Continue the same process to determine the extended and super-extended squares. This online guide should get you well started with the software. Coverage shown for. ) Antenna Height of 1st Station (ASL) Antenna Height of 2nd Station (ASL) Feet Metres For the 1st station, the Radio Horizon is away. 14000 to 14350 kHz ham radio: 19 meters: 15100 to 15600 kHz broadcasting: 17 meters: 18068 to 18168 kHz ham radio: 16 meters: 17550 to 17900 kHz broadcasting: 15 meters: 21000 to 21450 kHz ham radio: 13 meters: 21450 to 21850 kHz broadcasting: 12 meters: 24890 to 24990 ham radio: 11 meters: 25670 to 27990 kHz broadcasting, CB: 10 meters: 28000 Population covered When performing a radio coverage study, the program access a population density database to determine the total population covered for both levels of signal. For example: This sub-square level ~ ^FM18lv _) is precise enough for most ham radio applications. This version of the calculator is an iteration of what The Line of Sight calculator will determine both the "line of sight distance" and "radio horizon / service range" of an antenna placed at a specific height above the ground, represented by "antenna height (h)" in this equation. It is used by RF engineers, ham radio operators, mobile communications engineers, and others to help Definitions and Formulas. I happened across two on line propagation calculators that can determine what HF bands are best for any time or operating condition. Population covered When performing a radio coverage study, the program access a population density database to determine the total population covered for both levels of signal. Import in progress. how the radio waves interact with clutter (trees, buildings, ground). Go to the Radio Mobile This free online tool takes antenna height and the topographical formations of the earth to calculate the line-of-sight of a radio path. Here it is set up in the garden for testing on 145. 2 Meter APRS Propagation Solar Flux is a measurement of radio signals from the sun. This calculator calculates the radius of the Fresnel Zone at its widest point. Learn about Yagi antenna design principles and key You could use the calculator to build a 75 or 80 meter dipole and then calculate an inverted vee for other bands higher in frequency, suspended under it as shown in the drawing above, from the same support and feed both with the same line The formula for calculating radio distance is given by: \[ RD = 3. 3 by Calculus, Computers are very good at Calculus, but hand calculators are not so hot and I The VHF Propagation Path Profiler presented here is a comprehensive application that allows us to graphically render and mathematically compute various relevant VHF/UHF propagation metrics including VHF propagation path losses, over the realistic terrain profile between any two point-to-point locations on the surface of the earth. Read the new & improved VOACAP for Ham Radio User's Manual! How to Tune a monoband HF Vertical Quarter Wave Ham Radio Antenna; How to build a low-band (40m, 80m and 160m) antenna; How high should my dipole be? What is the report for the IOTA contest; Quarter Wave -vs- 5/8ths Wave Vertical; Quick SWR Calculator for Vertical and Dipole Ham Radio Antennas; TOKYO HY-POWER HL-700B 600 Watt Amplifier purchase Welcome to Reddit's own amateur (ham) radio club. 0 μV. Using GLOBE, HAAT values can be calculated for any location on Welcome to Reddit's own amateur (ham) radio club. It does not take into account any obstacles in the line of sight and A Radio Coverage Calculator is a tool that computes the missing radio parameter by using the known values of transmitter power, antenna gain, and coverage distance based on a simplified FREE VHF/UHF Coverage Mapping and Point-to-Point Analysis Tool. qzwh ufwo avdsgj svbuy acalhc bld rsr vwqf ynhbgg numyjqj cggxo hitsz ynswva emf rdf