This type of trap construction of fers several electrical advantages arid is. An additional requirement of having an input impedance close to 50. Coax trap design of antenna traps using a solenoidal coil of coaxial line this program allows a practical designer to do what he normally does wind some turns on a coil former and then vary number of turns until the. T his article describes a practical approach to the design and build of a sleeve dipole antenna mandated by a custom emc standard. The coaxtrap file computes design parameters for coaxial traps. The loaded dipole v2 is not as good as a full size antenna but it can be used in limited spaces and even indoors. Download skype and start calling for free all over the world. This application note describes basic measurement procedures using as example a homebrew coaxial cable trap. Antenna, ve3sqb ham radio antenna design software programs. Get detailed information, downloads, screenshots, latest updates, news, and special offers for coaxial trap design software at updatestar the social software search engine. Griddip meter method a simple way for the determination of the resonant frequency of a trap, or any tuned circuit is to connect a small section of wire forming a close loop, connected to the analyzer test port extension cable and. Made out of coax, it matches closely to 50 ohms and can be set up horizontally or in an inverted v.
W3jlp 0th the coil and capacitor of a parallelresonant antenna trap can be made from the same length of coaxial cable. The calls have excellent sound quality and are highly secure with endtoend encryption. Generate test snmp trap windows free software downloads. I do not claim that any of these antenna designs are original. Any line impedance may be chosen but a low value is preferred. Traps are used in the making of some multiband amateur radio ham radio antennas. Lets see some antenna calculator and antenna design software that will help you. The coaxial dipole or bazooka is the best keep secret. I guess my specific question is if there is an alternative to the coax trap that could be used in. Coaxial trap design free software, by tony field, ve6yp. It is a good idea to sand the former rough to allow good bonding.
Detailed analysis that concludes that an optimized coaxial cable trap will have a length to diameter ratio of 0. A coaxial cable trap is a parallel resonant circuit that is usually inserted in an. Coaxial trap design is a shareware software in the category miscellaneous developed by coaxial trap design. This improved multiband trap dipole introduces a new trap design and a change in trap location. At the righthand side of the trap, the inner conductor is separated from the braid and passed through the inside of the trap. Coaxial cable antenna traps these traps are neat, compact, cheap and easy to assemble. In exploring antenna design, i have been particularly influenced by the following. Checking coaxial cable traps using the mfj grid dip meter. The easiest way to determine the values of this circuit is to measure c, l and r s. Customers can choose to either buy cable in bulk or use our large selection of coax types to construct custom cable assemblies. The size of the antenna makes a half wave length on 80 meters, and with the traps a half wave on 40m with a swr. Bootrap coaxial traps for antennas there are other configurations using coaxial cable for antenna traps, so i will call this one a bootrap fig 1.
A coaxial trap antenna is a popular antenna design for amateur radio enthusiasts with limited space who are interested in obtaining increased bandwidth. All the basic construction details are included, and you can design an antenna for any frequency. Since an antenna trap is subjected to the full transmitter output power it should be remembered low loss is associated with greater over. Antenna calculator and design software electroschematics. The antenna features doublecoaxialcablewound traps having lower reactance and a higher quality factor q than earlier coaxcable traps.
How to build a coaxial trap antenna know about life. Body od in tubulation intended pump size cfm price ea order. An attic coaxialcable trap dipole for 10, 15, 20, 30, 40. Ive taken the project a few steps further, and mounted the elements in electrical conduit. Free coax trap design software download coax trap design. The trap is designed around solid polyethyleneinsulated coaxial line. The required calculation for length of coax and diameter of coil was assisted using the free coaxial trap design software of ve6yp which allows input of desired frequency 3. Coax trap design of antenna traps using a solenoidal coil of coaxial line. Will use the coax trap design calculator software to design the 20 meter coax trap see reference links. Coaxtrap this program let you design of antenna trap using length of coaxial line wound as solenoid on a coil. Ive done a great deal of reading this afternoon and have played with ve6yps coaxial trap design software and have highlevel understanding of how the form diameter and coax type affect the number of required turns to make the trap for a given desired resonant frequency. Hf dipole antenna this antenna software will help you design a simple wire dipole antennas for 1 30 mhz.
Pasternack carries hundreds of coaxial rf cables all instock and available for sameday shipping worldwide. A new trap design, using only rg58 and pvc pipe, yields better space efficiency than conventional coaxial traps. Yplog for windows support icom and kenwood radios, map programs and a program for coaxial trap design. The main category is antenna design calculators that is about antenna design calculators. Choose from 50 ohm, 75 ohm, 93 ohm and 95 ohm coaxial cables or 78 ohm and 100 ohm twinax cables. Yagi antenna, inverted vees antennas as well as jpoles and traps to extend. Ive modeled my 2040 inverted v like this and the eznec swr curve is nowhere near reality, eznec shows a much narrower bandwidth on 20 than what i actually see. Coaxial trap design runs on the following operating systems. By the way, a good startingpoint calculator for coax traps for multiband wire antennas is the coaxial trap design software by tony field ve6yp download.
Above is a homebrew 10m coaxial trap using rg58 on a 33mm former. Apple software update is a software tool by apple that installs the latest version of apple software. All the listed antenna softwares are freewares and available for free download. Coaxial traps the coax trap program computes design parameters for the construction of coaxial traps for hf usage.
This link is listed in our web site directory since tuesday sep 30 2008, and till today antenna trap calculator has been followed for a total of 20935 times. Two possibly useful freeware programs may be downloaded. The coax trap program computes design parameters for the. How to use the mfj grid dip meter adapter to check coaxial cable traps. Coaxial trap articles and programs use capacitanceft multiplied times length. It can also be used to create repeater maps for your country or province.
Design of antenna traps using a solenoidal coil of coaxial. It was originally introduced to mac users in mac os 9. Multiple coaxial traps can be installed on the same antenna line, which affords the radio operator access to radio frequencies otherwise unavailable without building a second or third antenna. Trap capacitors trap components should have a reactance of about 150250 ohms rule of thumb, which means a capacitance value of about 4326pf at my trap design frequency of 24. Using an antenna analyser it was simple to tune the trap and then run a thin bead of superglue to the coax to hold firmly in place on the former. Because of the cost and difficulty in finding high voltage doorknob capacitors, i. Coaxial foreline traps with fittings scientific instrument. About antenna trap calculator the resource is currently listed in in 2 categories. Distance from center of antenna to the center of the coil in feet must be less than half the total antenna length given above. A windows version has been available since the introduction of itunes 7. Cableiq reporter test management software is a windows program that helps you organize, customize, print, and save twisted pair and coaxial test records from a cableiq qualification tester. You will find a wealth of free antenna design information and software below.
The software was again executed, but this time with a form diameter of 4 inches. Coaxial traps for multiband antennas, the true equivalent. Listed under the antennastraps category that is about about antenna traps. I ran the coaxial trap design program to obtain l and c values for a particular trap design, then plugged those numbers into a load in eznec, and designated it as a trap. The help documentation contains complete diagrams and explanations.
You can sort the records in ascending or descending order based on the entries in the cable id, datetime, length, result, or qualified columns. Any trap dipole will produce secondary resonances, which can be guided into useful bands by careful trap design. A handy calculator program that provides all dimensions and information on. Testing some coax traps using an antenna analyser and homebrew grid dip meter adapter. It is very broadband for a dipole and makes a great field day antenna. Field, ve6yp, coaxial trap design, free ware, coaxtrap. Typically these are constructed from pvc tube and rg5859 coax. The azimuth file displays and prints an azimuth beam heading and mercator maps of the world from your qth. This is a good program to get you in the ballpark with a trap design.
Rf circuit of bootrap coaxial trap dynamic dx chaterhouse downloads coaxial trap design computes the construction parameters for coaxial traps. As stated in the application, the design is reasonably wideband a trick here, make the element from rg8 2 for wider bandwidth. A handy calculator program that provides all dimensions and information on constructing a coaxial trap. It was initially added to our database on 03202008. The latest version of coaxial trap design is currently unknown. W8nx details a new coax trap design used in two multiband antennas. Apart from low loss construction, the main design factor is lc ratio. The antenna was required to operate over the frequency range of 220 mhz to 225 mhz specified in the standard. The coax trap program computes design parameters for the construction of coaxial traps for hf usage.
A coaxial cable trap is a parallel resonant circuit that is usually inserted in an antenna element to enable building coaxial cable traps by w8wwv introduction this page describes the design and construction materials i used to build a coaxial cable trap. Total length of antenna in feet open the dipole length calculator in a separate page. Listed under the antennas traps category that is about about antenna traps. An attic coaxialcable trap dipole for 10, 15, 20, 30, 40, and 80 meters abstract a coaxialcable trap dipole antenna installed in the attic provides a surprisingly effective solution to hf operation on the 10, 15, 20, 30, 40, and 80 meter amateur bands at a qth with.
The map may be plotted on meterwide paper with good resolution. The following links take you to antenna designs that have caught my interest. Ham radio 20 40 meter short coax trap dipole antenna the. Sleeve dipole antenna design and build in compliance. Homebrew 4080 trap dipole design this antenna design was one that i used about 4 years ago, it worked exceptionally well on 80m and 40m. I really like a lot of the aspects of this antenna design, i just hated making the traps and they arent quite tuned as well as i would like, but in the end i want an antenna that will fit in my long, but not roomy attic.