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. The map may be plotted on meterwide paper with good resolution. A handy calculator program that provides all dimensions and information on constructing a coaxial trap. Ham radio 20 40 meter short coax trap dipole antenna the.
Since an antenna trap is subjected to the full transmitter output power it should be remembered low loss is associated with greater over. Checking coaxial cable traps using the mfj grid dip meter. 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. 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. Will use the coax trap design calculator software to design the 20 meter coax trap see reference links. The software was again executed, but this time with a form diameter of 4 inches. 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. 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. Yagi antenna, inverted vees antennas as well as jpoles and traps to extend. How to build a coaxial trap antenna know about life.
Coaxial trap design is a shareware software in the category miscellaneous developed by coaxial trap design. The coaxial dipole or bazooka is the best keep secret. Listed under the antennas traps category that is about about antenna traps. Listed under the antennastraps category that is about about antenna traps. The coax trap program computes design parameters for the construction of coaxial traps for hf usage. Design of antenna traps using a solenoidal coil of coaxial.
Coaxial foreline traps with fittings scientific instrument. W8nx details a new coax trap design used in two multiband antennas. The coax trap program computes design parameters for the. 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. Distance from center of antenna to the center of the coil in feet must be less than half the total antenna length given above.
Generate test snmp trap windows free software downloads. The loaded dipole v2 is not as good as a full size antenna but it can be used in limited spaces and even indoors. 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. It was initially added to our database on 03202008. This is a good program to get you in the ballpark with a trap design. 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. You can sort the records in ascending or descending order based on the entries in the cable id, datetime, length, result, or qualified columns. Coaxial traps the coax trap program computes design parameters for the construction of coaxial traps for hf usage. Coaxial trap design runs on the following operating systems. A coaxial trap antenna is a popular antenna design for amateur radio enthusiasts with limited space who are interested in obtaining increased bandwidth. 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. All the basic construction details are included, and you can design an antenna for any frequency. A handy calculator program that provides all dimensions and information on. W3jlp 0th the coil and capacitor of a parallelresonant antenna trap can be made from the same length of coaxial cable.
It was originally introduced to mac users in mac os 9. Coax trap design of antenna traps using a solenoidal coil of coaxial line. A windows version has been available since the introduction of itunes 7. Rf circuit of bootrap coaxial trap dynamic dx chaterhouse downloads coaxial trap design computes the construction parameters for coaxial traps. This application note describes basic measurement procedures using as example a homebrew coaxial cable trap. Testing some coax traps using an antenna analyser and homebrew grid dip meter adapter. 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.
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. Choose from 50 ohm, 75 ohm, 93 ohm and 95 ohm coaxial cables or 78 ohm and 100 ohm twinax cables. The following links take you to antenna designs that have caught my interest. Body od in tubulation intended pump size cfm price ea order. Traps are used in the making of some multiband amateur radio ham radio antennas. Pasternack carries hundreds of coaxial rf cables all instock and available for sameday shipping worldwide. 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 main category is antenna design calculators that is about antenna design calculators. The help documentation contains complete diagrams and explanations. This type of trap construction of fers several electrical advantages arid is. The latest version of coaxial trap design is currently unknown. An additional requirement of having an input impedance close to 50. The calls have excellent sound quality and are highly secure with endtoend encryption.
I do not claim that any of these antenna designs are original. The trap is designed around solid polyethyleneinsulated coaxial line. Apart from low loss construction, the main design factor is lc ratio. How to use the mfj grid dip meter adapter to check coaxial cable traps. The easiest way to determine the values of this circuit is to measure c, l and r s. Free coax trap design software download coax trap design. It is a good idea to sand the former rough to allow good bonding. 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.
This improved multiband trap dipole introduces a new trap design and a change in trap location. It can also be used to create repeater maps for your country or province. 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 articles and programs use capacitanceft multiplied times length. Hf dipole antenna this antenna software will help you design a simple wire dipole antennas for 1 30 mhz. 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. Yplog for windows support icom and kenwood radios, map programs and a program for coaxial trap design. Download skype and start calling for free all over the world. An attic coaxialcable trap dipole for 10, 15, 20, 30, 40. The antenna was required to operate over the frequency range of 220 mhz to 225 mhz specified in the standard. Customers can choose to either buy cable in bulk or use our large selection of coax types to construct custom cable assemblies. Coaxtrap this program let you design of antenna trap using length of coaxial line wound as solenoid on a coil. Coaxial traps for multiband antennas, the true equivalent.
Ive taken the project a few steps further, and mounted the elements in electrical conduit. Because of the cost and difficulty in finding high voltage doorknob capacitors, i. Total length of antenna in feet open the dipole length calculator in a separate page. Above is a homebrew 10m coaxial trap using rg58 on a 33mm former. 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. 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. I guess my specific question is if there is an alternative to the coax trap that could be used in. The antenna features doublecoaxialcablewound traps having lower reactance and a higher quality factor q than earlier coaxcable traps. Lets see some antenna calculator and antenna design software that will help you. T his article describes a practical approach to the design and build of a sleeve dipole antenna mandated by a custom emc standard.
A new trap design, using only rg58 and pvc pipe, yields better space efficiency than conventional coaxial traps. About antenna trap calculator the resource is currently listed in in 2 categories. Typically these are constructed from pvc tube and rg5859 coax. Any line impedance may be chosen but a low value is preferred. It is very broadband for a dipole and makes a great field day antenna. Made out of coax, it matches closely to 50 ohms and can be set up horizontally or in an inverted v. 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. Field, ve6yp, coaxial trap design, free ware, coaxtrap. Two possibly useful freeware programs may be downloaded. 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. All the listed antenna softwares are freewares and available for free download. Coaxial trap design free software, by tony field, ve6yp.
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