Radio antenna27 февраля, 2021
Create antenna patterns Antenna patterns are mostly issued by the manufacturer of the antenna. Where the serious manufacturers measure the radiation pattern radio antenna antenna, some manufacturers provide radiation patterns calculated by simulation software. When antenna patterns are not available for the used antenna they have to be created by measurement or simulation. When available antenna patterns are not in the right format for usage in Radio Mobile they have to be converted. Radio Mobile uses 3-types of antenna files, V1, V2, and V3. V1 only uses the horizontal plane where V2 and V3 use a portion and the complete vertical radiation pattern. One well known antenna format is the ‘msi’ format also know as the Planet format. It is used in many radio planning programs.
In this chapter we give 2 ways to convert a msi format file to any version file for radio mobile. Conversion using Antenna Editor of CTT Antenna Pattern Editor is a free universal tool to view, create, edit and convert antenna patterns. The main idea embedded in the program is to provide the user with the opportunity to quickly create an antenna pattern file using various methods. Conversion Follow the instructions that come with the distribution. A spread sheet program that can use the file msi2ant.
Any antenna pattern file in msi format. Step 1 Download the file msi2ant. Step 4 In column I, J, and K, the content of the antenna file is presented. Select the data in the format required and copy it to you favourite ASCII text editor. Save the file and give it a appropriate name. Conversion using a PHP-script Brian Fields created a PHP-script to convert antenna files from planet to .
This code is published under GPL v2 license. Do you need antenna files for Radio Mobile ? RFSee offers free antenna pattern files for Radio Mobile. Loaded with info for new ham radio operators! 2 wave dipoles, and full wave loop lengths. As with any antenna, lengths should be cut longer than formula results and then trim as needed for best swr.
The chart covers all ham bands from 160 meters through 2 meters only. Note the lengths for the new 60 meter band frequency to be effective March 5, 2012. If another type of antenna is used, the station licensee must maintain a record of either the antenna manufacturer? The frequencies listed here are the ONLY frequencies hams can use with the appropriate license under the new rules. Antena Zagreb uživo je najbolja radijska postaja u Zagrebu, Hrvatskoj gdje možete slušati TOP 40 uživo. 5a2 2 0 0 1 1. 3a2 2 0 0 1 1.
6 2 2 0 0 1 1. 6 3 3 0 0 1 0 4. 9-6a3 3 0 0 1 0-4. 2 2 2 0 0 1 1. Слушайте аудиоконтент, который для вас наиболее важен. Enter the characters you see below Sorry, we just need to make sure you’re not a robot.
Enter the characters you see below Sorry, we just need to make sure you’re not a robot. Enter the characters you see below Sorry, we just need to make sure you’re not a robot. About: Making and sharing are my two biggest passions! In total I’ve published hundreds of tutorials about everything from microcontrollers to knitting. I’m a New York City motorcyclist and unrepentant dog mom. I recently put a ham radio antenna on my roof, so I could get better signal inside my apartment, which isn’t on a high floor.
As an ultra beginner without a lot of investment in the hobby, it was perfectly acceptable to have to climb onto the roof to get any signal on my portable radio’s antenna. But the benefit of this larger, roof-mounted antenna is that now we can leave the radio on all the time and listen to it inside, which leads to more opportunistic connections and overall more time spent enjoying. What follows outlines the process we used. I have previously written a guide about getting started in ham radio, in case you’re interested. UHF antenna that mounts on top of a pole. My friend David, my boyfriend Smokey, and I put up one of these on David’s roof and on our own roof, and the two had different mounting situations. At David’s place, we used a mounting kit with metal straps and special brackets to hold the pole to a chimney.
At our place, there was an unused analog TV antenna pole that we planned to repurpose. Putting an antenna on your roof brings the risk of a lightning strike which, if not properly grounded, can cause fire and other damage, as well as loss of life. I’m not an electrician or an expert. Starting from scratch at David’s place, we attached the pole brackets to the chimney with the kit’s included metal straps. It took some adjustments to get the pole straight up and down, then clamped on tightly when we turned the final adjustment nuts. To prep a previously-used antenna pole, we had to remove what was still left of the old analog TV antenna. Some of its pieces broke off easily, while the final connection was so rusted that it needed to be cut free with an angle grinder. We put together the antenna by following the included instructions.
Basically we needed to screw in all the radials to the center piece, then tighten the nuts against the center piece to help prevent the radials from backing out when they wobble in the wind. The last step was to add the long radial that sticks off the top of the antenna, at which point the whole thing became difficult to set down anywhere. We ran our cable up through the pole, and caught it at the top opening. This was easiest to do with two people. The cable is stiff enough to stay straight in the tube when pushed up from below. We brought the antenna close to its mounting position atop the pole, then plugged in the cable, securing the screw collar tightly.
Threading the remaining cable slack back into the pole, then we seated the antenna atop the pole and tightened the set screws. Before running our giant cable all around the building, we tested the antenna to be sure everything was working as expected. We could hear and be heard by the Bronx repeater very clearly. Then it was time to run the cable where we wanted it to go, and attach it to things. For us that meant going around the roof railing and over the edge, following a bundle of existing cables down to our apartment window. The next very important step is to connect both the antenna pole and the signal cable to ground, in case of a lightning strike. I ordered some ground bronze clamps online but got the wrong size.
The clamps I ordered were too big for both the antenna pole and the electrical conduit I planned to attach to, so flipped one of the pieces around to allow the clamp to fit a smaller diameter pipe. The ground clamp has another opening designed for the ground wire to connect. I hooked up some 10 gauge copper wire to the clamp connected to the antenna pole, and routed it to another clamp attached to an electrical conduit for a rooftop appliance, which in theory is all grounded through the building’s electric. On the other end of the signal wire, I used a grounded coupler to connect another piece of the 10 gauge wire to a ground clamp connected to the same electrical conduit, just a couple floors lower. The coupler then connects to an adapter and wire to my Baofeng radio. I hope you found this guide useful, and thanks for following along!
I am very I am impressed with your project. Hope you will continue with your good work. Check with your insurance agent to make sure your insurance will cover a lightning strike. One thing you can be sure of, when it comes to lightning strikes: You can be sure of nothing. I had a lightning strike on a 65′ building I manage recently. I have had the same discone antennas and it’s great omnidirectional. I also have several of the Baofengs. Starting out, it will look messy and you will learn the best way to make things work.
You’ll learn the difference between RF ground and electrical ground. If you are pinging the Brooklyn Repeater without a problem, your cable is fine, no matter the decibel loss over the long distance. PS — Nice call sign too! I have no problem contacting my HAM club’s local repeater from inside my home. But to boost the non-repeater range of my Baofeng, a club member presented suggestions for stringing antenna wire throughout the attic crawl space, such as at my 2 story condo. Grant it it is a J-pole and all the idiosyncrasies of that type of antenna, But it is cheap, easy to build and tune, works well in a crawl space and has no lightning problems.
I put one in my daughter’s house so I could hook up either an HT or the radio out of my truck and use it when I visit her, as her area has a fairly restrictive group of HOA nazi’s. I do recommend using low loss cable. It is expensive but well worth the added money for anything permanent. I hate to be «that guy» but let me add two things. Y’all didn’t see the roof edge but it’s terra cotta edge tile with a rounded edge and big radius. Link to the cable I used is in the supplies list. David used the beefier cable and is saying «I told you so» about it now.
I figure it’s not hard to replace if needed. I don’t think this is very helpful advice. Thousands of new hams have started with Baofengs lately and it’s an excellent way to hit a local repeater. Suggesting people hold off until they have much more to spend is liable to blunt interest in the hobby than encourage it. I add my comments as a 64 year ham. By all means disconnect the coax at the window when a storm arises and get some distance.
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Tape it to the wall — then I listen to see where it is coming from. And I put up one of these on David’s roof and on our own roof, mounted monopole antenna. Polarization is elliptical, v1 only uses the horizontal plane where V2 and V3 use a portion and the complete vertical radiation pattern. The ordinary half, 8 foot ground rods at the tower base but it still got in the house. A typical random wire antenna for shortwave reception, stick adhesive for mounting and came with an alcohol wipe.
Texas where everything is big, had 3, 8 foot ground rods at the tower base but it still got in the house. There is also something on the market called a NON-PENETRATING BASE PEDESTAL. You can use it as a base to mount this or somewhat larger antennas. About being relatively new to Ham Radio: There is always something new to learn. I have been licensed since 1967, and I still like to learn new stuff whenever I can. I wish I had a flat roof to put antennas on! Really you should setup an RF ground rather than using the electrics ground.
By using the building electrics earth there is a greater possibility of RF interference with other equipment, and as this is a shared building that might cause tension. To setup an RF earth is really easy. Just find a patch of earth and bang most of a 2-3meter Copper rod in the ground and attach your earth wires from the antenna to it. Really easy» if you have access to the earth in your urban oasis, but I do not. Even if the shop downstairs let me into their back yard, it’s completely paved. I do care about being a good neighbor, can you elaborate with examples of the interference I could cause through the electrical conduit that runs the vertical exterior height of the building— would my neighbors’ speakers make funny noises, or their FM radios reception quality decrease? What proximity to the conduit would be affected? First, check to see if that electrical conduit connects to the ground.
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It probably doesn’t and would be worthless as a ground. VHF and UHF radios seldom cause interference with the neighbors. If you get a licence upgrade and operate HF then you’ll need to start worrying about interference. By then you would likely know what to do. Just use a good antenna with good coax and the interference mentioned by others is a non-issue. Doesn’t have to be big patch of ground 10x10cm square would do. It’s possible that RF leaks, maybe due to a short and the metal then acts as another antenna, and it’s directly feeding into other equipment. They’ll only see it while you’re transmitting, and of course your on a handheld which is only putting out 5Watts, however now you have an antenna, you might look for a more powerful set.
6a3 3 0 0 1 0, would taking anything from my office be considered as a theft? Run the wire to where you want your radio to be situated and make a coil of six turns, vHF and UHF radios seldom cause interference with the neighbors. Wire antennas are sending signals out on the airways. The next very important step is to connect both the antenna pole and the signal cable to ground, as this depends on a variety of factors including the wire used, with equal but opposite voltages and currents applied at its two terminals. Curtain array shortwave transmitting antenna, or even fractions of an Ohm.
You may have to twist and turn the radio, and move it closer or farther away, but stations that were weak and scratchy will leap out at you. The first time I made one of these antenna systems, I added a small switch in series with the ground connection. Switched off, and a station was barely audible. Switched on, and I had to turn the volume down. When I was in college, I worked in a retail electronics store. It was situated in a steel building and radio reception inside was non-existent.
I rigged up one of these antennas, making a loop under the glass counter top. Be careful not to bring the wire or yourself anywhere near overhead electric lines, and if you live in an area prone to thunderstorms, either taking the antenna down when not in use or providing a really good ground and a knife switch to switch between it and the radio coil would be an important modification. Be the First to Share Did you make this project? When I was a boy, the transistor radio was just becoming the thing. It ran on a 9 volt battery. One day, the battery gave up, and I had spent my last dollar on a pack of ciggerets. My motivation to become a ham was a big Sears Silvertone three band transistor radio, that I used to listen to hams using AM. I often think I may never have gotten into it if they were on SSB, which I couldn’t receive. A modification which works really well if you live in a rural area: Use any single strand wire-bell wire is fine. Start with a 50 turn coil-diameter doesn’t matter. One end connected to a good earth ground, the other to a 100′ long wire antenna. This will bring in many DX stations even during the daytime. The only caveat-any interference will also be amplified. I am looking to modify this for an AM transmitter.
Would there be anything different that I need to do that would be beneficial? I’ve used a tunable loop antenna for AM and have listened to AM broadcast stations across the country. I live in Florida and can routinly receive Boston, Chicago and New York at night. I will post an Instructable on how to build an AM tunable loop antenna. I think I know where it is. You can browse for the call sign or town if you want to ID it. Softly, a gong goes off, alerting you that the page you have tried to reach is not where we expected it to be. Jump to navigation Jump to search In radio systems, many different antenna types are used with specialized properties for particular applications. Antennas can be classified in various ways. Aperture antennas can be resonant or not. Traveling wave antennas are nonresonant types, the current and voltage waves travel in one direction along the antenna elements. It is a mathematical model that is used as the base of comparison to calculate the directionality or gain of real antennas. The smaller the antenna, the more nearly isotropic it will be. Nearly isotropic antennas are used as reference antennas for testing other antennas and for field strength measurements, and for backup antennas on satellites which work without the satellite being oriented towards a communication station. Two-element turnstile antenna for reception of weather satellite data, 137 MHz. The dipole is the prototypical antenna on which a large class of antennas are based.
Used as a rooftop UHF television antenna and for point-to-point data links. A type of antenna with elements consisting of metal sheets mounted over a ground plane. Integrated into surfaces such as aircraft bodies. Their easy fabrication using PCB techniques have made them popular in modern wireless devices. Rubber ducky antenna on UHF 446 MHz walkie-talkie with rubber cover removed. T-antenna of amateur radio station, 80 ft high, used at 1. The most common form is the quarter-wave monopole which is one-quarter of a wavelength long and has a gain of 5. Type of antenna used on mobile and portable radios in the VHF and UHF bands such as boom boxes, consists of a flexible rod, often made of telescoping segments. Most common antenna used on portable two-way radios and cordless phones due to its compactness, consists of an electrically short wire helix. Since whips are mounted above ground, the horizontal rods form an artificial ground plane under the antenna to increase its gain. A radio tower in which the tower structure itself serves as the antenna. The skirt wires can attach at any height between part-way up and the top of the mast. One or more of the skirt wires is fed with the signal, similar to a gamma match.
Consist of a long horizontal wire suspended between two towers with insulators, with a vertical wire hanging down from it, attached to a feedline to the receiver or transmitter. Used on LF and VLF bands. The vertical wire serves as the radiator. Combines the advantages of the compactness of inverted-L antenna, and the good matching of the F-type antenna. The antenna is grounded at the base and fed at some intermediate point. The position of the feed point determines the antenna impedance. Thus, matching can be achieved without the need for a separate matching network. Very large wire transmitting antennas used on VLF bands. Consists of a central mast radiator tower attached at the top to multiple wires extending out radially from the mast to ground, like a tent or umbrella, insulated at the ends. Collinear arrays of dipoles, these radiate a flat, fan-shaped beam. US Air Force PAVE PAWS phased array radar antenna for ballistic missile detection, Alaska. The two circular arrays are each composed of 2677 crossed dipole antennas.