2 meter slim jim pdf

Build a roll up portable 2m 144mhz slim jim antenna the slim jim antenna has a number of advantages over a helical or quarter wave. Vhf uhf antenna basics diy antennas from surplus 800mhz antennas for 2m 70cm and dual band duration. A tri band antenna for 2 meters, 220 mhz, and 70cm antenna. I first introduced the concept of this antenna in feb. It is the most effective antenna when compared to other ground plane antennas. System types the slim jim boiler range can be used in various system designs including under floor systems. Aug 10, 2011 the original 2m slim jim was designed by fred judd g2bcx, who lived in norfolk before he became sk some years ago. In the copper pipe variation, the slim jim uses more materials for no performance benefit.

This antenna is made from a length of 300ohm ribbon cable, which makes it easily portable, but you have to devise some method of suspending it. Here are the plan i use for constructing and experimenting with slim jim antenna on 2 meter vhf amateur band. The slim jim, similar to the jpole, is in fact a half wave end fed dipole, in the slim jims case, an end fed folded dipole. This link is listed in our web site directory since wednesday feb 23 2011, and till today 2 meter slim jim antenna from ordinary wires has been followed for a total of 4987 times. The only difference between the two is the slim jim bends the antenna back on itself to make a folded dipole half wave end fed, while the j pole simply has a single wire end fed dipole. The 2 meter antenna worked perfectly on the first try. The slim jim, designed by the late fred judd, g2bcx, can be a great portable roll up antenna, if made out of 300.

Oct 06, 2014 stepbystep build of a dbj1 antenna for the 2 meter and 70 cm ham bands. Unlike most, my antennas are not made from schedule 40 pvc. Apr 20, 2017 vhf uhf antenna basics diy antennas from surplus 800mhz antennas for 2m 70cm and dual band duration. Howto 2 meter slim jim antenna from ordinary wires. In other words, it does the same thing as the traditional jpole all the while using more construction materials. Nylon fishing line 1 meter of 1 2 mm thick nylon line hardware store fig. Slim jim j integrated match jpole is probably the most easiest and powerful 2 meter antenna to build provided you have the exact measurement and material to build it. Aug 19, 2015 the slim jim pattern maintains the classic jpole slightlylopsided shape with the slightly stronger and slightly higher lobe in the direction of the j stub. Mounting instructions for the kb9vbr slim jim antenna. Yaesu at least in europe use ntype chassis sockets for their uhf.

Add a loop of string to the top, and hang it on a tree branch, use it with your handheld transceiver, then roll it up. What is needed is a method to decouple the extra length of the 2 meter radiator at uhf in order to create independent. It does not require any ground plane radials because it is an end fed half wave. The 2 meter slim jim copper tubing antenna project by richard ke5fxu sk updated 1162012 credit for the original design goes to f. The slim is an endfed folded dipole antenna that has a gain of 6 dbi and a nice low rf take off angle. Kinsner, ve4wk jpole antenna for 2m 3 of 3 1 2 3 4 5 6 7 8 e d c b a e d c b a 1 2 3 4 5 6 7 8 5 june 1992 jpole parts list procedure p2 m1. Examples of these are copper jpoles, slim jim, arrow. I used half inch od junk aluminum tubing cut to these final lengths.

Not wanting to be out done by myself and after having the temporary j pole to slim jim conversion project lay down on the ground due to some high winds we had, i decided to get with it on this 81 degree day. My latest project is a slim jim antenna for my 2 meter radio, made from copper pipe. The original 2m slim jim was designed by fred judd g2bcx, who lived in norfolk before he became sk some years ago. If you decide to make a 2m antenna, youll end up with 1.

I borrowed an swr meter from another local ham, followed the measurements of the antenna very carefully, but im having a terrible time getting. Other useful information would include your experience with similar products, infomation on a product that you would purchase instead of this one, and so on. This link is listed in our web site directory since thursday dec 2012, and till today 2 meter slim jim antenna has been followed for a total of 946 t. This is necessary because feeding a halfwave antenna at its end presents a very high feed point impedance of several thousand. Use a screwdriver and pliers to release one wire from beneath one of the rivets on the 58inch element.

Howto 2 meter slim jim antenna from ordinary wires please. I used to have the yaesu ft897d, which is why i have the ntype attached for vhf and uhf. Now a day, many apps for ham radio have been developed by various. The 2 meter slim jim needs to be isolated from your mast. Refer to the slim jim antenna project for more details if needed. About 2 meter slim jim antenna the resource is currently listed in in a single category. In no time ill be pulling the trailer out of the garage and planning some outdoor adventures. It uses a matching system similar to jpole antenna. Dbjuhf was developed from a grant from ac daughty to develop a low cost medium gain mesh antenna for uhf. I have an x50n colinear, with about 5 metres of westflex 103 of which both ends are terminated with an ntype plug. Be prepared and able to communicate in case of emergency with the largest selection at. About 2 meter slim jim antenna from ordinary wires the resource is currently listed in in 2 categories. As such, it will have a higher radiation angle component on 70 cm than on 2 meters, so 70 cm repeater access will not be optimum for stations far from the repeater.

A slim jim antenna is basically similar to a jpole design, but it is supposed to exhibit a lower radiation angle in the range of 8 degrees on the horizon, compared to 12 wave jpole which exhibits a 20 degree angle on the horizon. Tips for using your 2 meter ladder line rollup jpole antenna click here to download pdf. The antenna does come with a mounting kit that consists of a length of pvc tubing and two hose clamps. This link is listed in our web site directory since thursday dec 2012, and till today 2 meter slim jim antenna has been followed for a total of 946 times.

Stepbystep build of a dbj1 antenna for the 2 meter and 70 cm ham bands. This makes the 2 meter slim jim antenna a great solution for repeater sites, data and packet stations, aprs, and even every day communications. Most people make these for 2m use, but you can make them for 70cm use if required. That one worked well also, but was a little harder to tune. It is the same antenna that appears on the front cover of the arrl vhfuhf antenna classics handbook. The measurement used are designed to center around 144148 mhz radio frequency, which is used by amateur radio world wide. Ive been reading several articles on the net about them and how to tune them properly. I am new to 6 metre operations and am in the process of designing a wire based antenna to use on six metres. The vertical angle of radiation and pattern of the jpole and slim jim antenna jpole gain slim jim vertical horizontal gain over the jpole horizontal du1anv.

Note the difference in energies of the two frequencies. Authentic kb9vbr 2 meter vhf slim jim amateur ham radio jpole base antenna. A jpole antenna, like the one shown in figure 1, is an end fed half wavelength. Two pages click updown arrow icons to navigate pages. Describe your experience with the slim jim portable 2 meter antenna by n9tax and tell us why you give it the rating you did required. The approximate gain in the hplane of the slim jim is from 1.

You will need two additional clamps to attach the isolator section to the mast. Jan 18, 2008 here are the plan i use for constructing and experimenting with slim jim antenna on 2 meter vhf amateur band. The dimensions quoted in the diagram have been used successfully by some constructors, whilst others have found it to be offfrequency by a few megahertz. The main category is slim jim antenna that is about slim jim antenna.

Slim jim j integrated match jpole is probably the most easiest and powerful 2 meter antenna to build provided you have the exact measurement and material to build it this how to will show you how to build a 2 meter slim jim antenna from ordinary insulated copper wire commonly used for carrying ac alternate current electricity in your household. Why is the slim jim so much more efficient than the popular 58 wave or other ground plane antennas, despite the latters claimed 3db. A tri band antenna for 2 meters, 220 mhz, and 70cm antenna without radials by. It is quite broadband because of its folded element. Fyi this is the plan that i use to construct my first ham radio antenna using pvc pipe and aluminium tube. The superj variation of the jpole antenna adds another collinear halfwave radiator above the conventional j and connects the two with a phase stub to ensure both vertical halfwave sections radiate in current phase. The resource is currently listed in in 2 categories. Edison fong wb6iqn us patent 9,608,336 qst march 2017. Real measurements of a slim jim antenna and traditional jpole antenna reveal the truth about their respective gain and pattern. The j antenna goes back many years, long before i became a ham.

Cebik web site requires registration free commercial 2m 70cm slim jim n9tax. They are made from 200 psi pvc because it is a thinner wall providing better antenna performance all the way around while maintaining. Slim jim antennas have no performance advantage over the conventional jpole antenna. Kb9vbr jpole antennas amateur radio vhf and uhf antennas. This is a great homebrewdiy project with amazing results. Over 7000 antennas sold and now comes rated for 150w specs and what you get are as follows.

This how to will show you how to build a 2 meter slim jim antenna from ordinary insulated copper wire commonly used for carrying ac alternate current electricity in your. Nylon fishing line 1 meter of 12 mm thick nylon line hardware store fig. This 10m one, made from 450 ohm slotted ribbon cable from moonraker and secured on an 8m fishing pole, was inspired by jim bacon g3yla also a fellow norfolk ham who brought one along to our annual radio by the seaside event. The 450 ohm ladder line slim jim antenna hamuniverse. Measure up about 4 inches from the bottom and remove the insulation from each side of the slim jim antenna using the 4 inch measurement as your center point and remove the insulation about 2 inches up and down from the 4 inch mark to give you access to the. It is very easy to build and does not take days to construct. Build a roll up portable 2m 144mhz slim jim antenna. This calculator can be used to design a slim jim or a j pole antenna. A jpole antenna is a halfwave vertical fed at its base through a shorted quarterwave stub acting as a transformer matching section. I like to use my slim jim antenna for running emergency weather nets as the increased gain gives me a nice strong signal into the repeater and also makes it easier to capture weak stations on simplex if. Some of the amateur bands are used for the entire amateur radio band and a few for uplinks and downlinks of information to and from the satellite. Although the smith chart shows that this point is slightly inductive, it is still an excellent match to 50. Add a loop of string to the top, and hang it on a tree branch, use.

Further experimentation with the 2 meter 146mhz slim jim antenna using aluminum tubing. Traditional jpole antenna february 8, 2018 august 19, 2015 real measurements of a slim jim antenna and traditional jpole antenna reveal the truth about their respective gain and pattern. Jul 06, 2012 6 meter 300 ohm twinlead slim jim antenna project metric. Measure up about 4 inches from the bottom and remove the insulation from each side of the slim jim antenna using the 4 inch measurement as your center point and remove the insulation about 2 inches up and down from the 4 inch mark to give you access to the conductors on each side of the antenna for swr tuning. Portable rollup jpole antenna deployment and usage tips. I have used this antenna made by nelson antennas on ebay on many occasions over the past 2 years. Judd, g2bcx get that signal lower to the ground for better performance. As with all folded dipoles, the currents in each leg are in phase, but in the matching stub they in phase opposition, so little or no radiation occurs from the matching section.