How To Make A 2 Meter J Pole Antenna

2 to 1 on 2 meter. 2 Meter ARDF Receivers The typical two meter ARDF receiver consists of a short hand-held yagi antenna with two or three elements, and a dedicated receiver and attenuator, often mounted on the antenna boom. A Hawaii-based Amateur Radio Antenna Blog focusing on the theory, design, and use of homemade antennas. The history and basic theory of this antenna dates back to 1946. A 6 Meter Moxon Antenna Discover 6 meters for the first time or enhance your existing operation with a rugged but portable version of this novel 2 element antenna. This was created as a fun project to demonstrate how to enjoy operating HF in the field with a home-made portable antenna without spending a ton of money. Calculate beam antenna gain by the number of elements Build a portable 2 meter J-Pole antenna using 300 ohm lead Good detailed article on building J-Pole antennas. PIC Solution PIC Processor $5 MAX232 $1 MCP6002 $1 AD9850 Board $4 RF Connector $1. It is used to design J-pole antennas for the desired frequency. € The diagram provided is a more simplified version of the one I did. It must be placed as high as possible, properlymatched to the transmitter, and designed to effectively radiate the powerapplied to it. The DBJ-2: A Portable VHF-UHF Roll-Up J-pole Antenna for Public Service Edison Fong, WB6IQN WB6IQN reviews the theory of the dual band 2 meter / 70 cm J-pole antenna and then makes detailed measurements of a practical, easy to replicate, "roll-up" portable antenna. The PEF 160-10 contains a FT-240/61 trifilar wound, 9:1 UNUN (unbalance to unbalance) torrid matching transformer that will match the high input impedance of an end fed antenna into the range where most antenna tuners can produce good performance. 2 weeks after I got my ham ticket I built a ground plane antenna, its a little bit easier than building a J pole due to finding latter line. AN ALL-COPPER 2-M J-POLE Rigid copper tubing, fittings and as-sorted hardware can be used to make a really rugged J-pole antenna for 2 m. M2 Antennas 2M4 2 Meter Yagi Antennas. Authentic KB9VBR 2 Meter VHF SLIM JIM amateur ham radio J-Pole base antenna 713543871555 | eBay Trusted by hams world-wide, what makes a KB9VBR antenna better?. 30 foot 10-80 meter high performance commercial duty flagpole antenna LIVE IN A HOA RESTRICTED AREA. This is particularly true of the lower 3 MURS channels. • If the antenna is to be placed outside, do not use brass. I saw the plans for this on the internet (link to plans) by Allen Lowe (N0IMW). I'm going to build one for a temp antenna. 2 weeks after I got my ham ticket I built a ground plane antenna, its a little bit easier than building a J pole due to finding latter line. For 2 meters, the coil is 4 turns of coax at 5 inches in diameter. A few hours of fun with PVC and wire and you ve got yourself a respectable road radiator! Much taller than the average Ham mobile antenna, this tree branch snapper tops out at 17 feet, 10 inches above the road. As such, it will have a higher radiation angle component on 70 cm than on 2 meters, so 70 cm re-. pole broken in the middle at the plastic insu-lators. Need a high-performance antenna for the 2 meter amateur radio band? Come join us at Dallas Makerspace as we make a copper J-Pole antenna from scratch. Where can I find a guide with the information to make one ? I know there are a lot of guides but I would like to get one optimized for airband. Ham Radio Info; Antenna Building. Below a small description of an easy to make and cheap multiband wire vertical. there was a simple way to convert a 2 meter J-pole into a dual band J-pole DBJ-2 was developed from the successful performance of the DBJ-1 but folks requested a portable version. The antenna made in this video is an open stub j-pole. Hood, KD8JB 2323 Jefferson Drive SE Grand Rapids, Ml 49507-3148 number of years ago, I built a J-Pole antenna from some scrap aluminum tubing and a 5-foot stick of TV mast. Tuning Your 6-Meter J-Pole You can use a capacitive coupling strap to easily tune your 6-meter J-pole for a different portion of the band. Radio Shack # 21-961 3/8"-24/SO239 Mount (Mobile CB Antenna). I have a 10 meter wire dipole up now connected to a Radio Shack HTX100 so I can listen to 10 meter CW in preparation for my code and General exams in October. So before the snow storm hits tomorrow, I thought I would try making some j-poles with the Buddipole. Cebik, taking into account the unconnected “loose wire” opposite the normal ½ wave radiator. A 146 Mhz J-Pole Antenna. The J-pole antenna, more properly known as the J antenna, was first invented by Hans Beggerow in 1909 for use in Zeppelin airships. Thus it is about 3/4 wave tall at the operating frequency. 1 program produced these antenna pattern graphs showing the pattern you should expect. L Match Tuner for End-Fed wire antenna; 20-Meter Vertical dipole antenna; 1. Construction You'll need hangers that are 16 inches wide; the 18-inch kind because they ca not be tuned to 2 meters. I settled on a 2 meter vertical dipole. Many RASON members truly enjoyed last month's collinear antenna. This in itself says something about the dedication I have to creating a quality product. 7 Element VHF High Gainer N. The original sleeved dipole project idea is from Harold Melton KV5R. The theory for a single band J-pole is first described. J-Pole Antenna Product Description The airband J-Pole antenna is tuned for the 118 - 128 MHz aircraft aviation band. It does not need a ground plane, radials or a complicated matching system. Make sure that the antenna is located away from any metal. Copper Cactus Dual-Band Super J-Pole Antenna Projec t Your going to like this super J-pole project, This home made j-pole is easy to build and sturdy, While looking for an jpole antenna project to build I remembered seeing a Marine antenna called the Super J-Pole in the 1988 ARRL Antenna Handbook, which claimed a 6 db gain over a quarter wave. in MHz Stub (in inches) = 2880 Freq. The J Pole antenna is a simple antenna to build for most builders and requires little skill or tools to make it work properly. This leaves the two remaining radiators in-phase and contributing towards horizon coverage. For 2 meters, the coil is 4 turns of coax at 5 inches in diameter. The J-pole and other end-fed Hertz antennas are prime examples of antenna that can have severe feed line common mode current problems. My main shack location has a commercial J-Pole Dual band mounted on a short mast. Need a high-performance antenna for the 2 meter amateur radio band? Come join us at Dallas Makerspace as we make a copper J-Pole antenna from scratch. Many thanks!. Bicycle J-Pole John S. This simple antenna lends itself well to emergency use or as a portable antenna for hotel room operations while traveling. Many thanks!. 2 meter/440 “j” using cb whipn6jsx. 1/4 wave ground planes work well, but will have half the signal of a dipole. 3 ounces), compact and effective! The antenna can be set up quickly and easily by hanging out a window, attach to a ceiling, or toss a lead sinker over a tree branch with kite string and hoist it up. The N9TAX Slim Jim antenna is the highest quality roll up antenna available today. Tuning Your 6-Meter J-Pole You can use a capacitive coupling strap to easily tune your 6-meter J-pole for a different portion of the band. 2 meter can rock, but as the man said, its widely variable. Introduction. Steve, Just to let you know HOW good 10 meters is. Hood, KD8JB 2323 Jefferson Drive SE Grand Rapids, Ml 49507-3148 number of years ago, I built a J-Pole antenna from some scrap aluminum tubing and a 5-foot stick of TV mast. › Scanner signals work on line-of-sight, not satellites, so anything from a tree to a hill can inhibit signal. This antenna is an 8 element, optimum spaced, 2 meter beam. Number 8 solid copper ground wire is an easy to find source for element material. The Super J-Pole Antenna(Collinear Design) Below is a Javascript for calculating the lengths of tubing to be used for the construction of a Super J-Pole. You need to solder the 19. Most hardware stores don't carry it anymore. 50 SO-239 to BNC (male) $2. Next step for me is a 10 meter antenna - I haven't decided what to build yet. This is a very simple antenna to build. There are times when you may need more gain than the standard J-Pole antenna. This antenna was defiantly worth the purchase which was reasonable at $35. Connect the Dummy Load to the end of the coax instead of the Antenna. The design uses a matching system like a j-pole antenna. I needed another antenna so today I. Build Your Own Antenna Analyser for under $50 Beric Dunn K6BEZ $20. This antenna can be used by radio amateurs living in HOA/CC&R-controlled apartments. You are ready to fire up the your collinear! See figure 7. › The higher you put your antenna (pitch of roof or top of vehicle) the better the reception. This antenna is also known as the "copper cactus" (because it kind of looks like one of course!). Need a high-performance antenna for the 2 meter amateur radio band? Come join us at Dallas Makerspace as we make a copper J-Pole antenna from scratch. This picture shows that the base of the antenna is mounted flush to the top of the mast. 6 Fastening of the Antenna • The antenna may be fastened to any support, including grounded metal. Handmade Slim Jim Antenna's by N9TAX Let me start by saying that since discovering the slim jim antenna design I have really come to respect these antennas. The DBJ-2: A Portable VHF-UHF Roll-Up J-pole Antenna for Public Service WB6IQN reviews the theory of the dual band 2 meter / 70 cm J-pole antenna and then makes detailed measurements of a practical, easy to replicate, “roll-up” portable antenna. 1" wide by 1/16" thick stock makes a good assembly, and set screws will hold the pieces in place, especially if the flat stock is tapped for the set screw thread. Obviously, it is necessary to combine the two antennas. Being made of copper pipe they are heavier than commercial aluminum antennas but they work. com in 2 categories. 2m Projects - Omnidirectional Antennas A 146MHz J-Pole Antenna by WB8ERJ Here is a 2 meter (146 Mhz) J-Pole antenna that is inexpensive, and easy to build. Pityu was able to use some copper tubing, a steel wire from an old CB antenna, and a homemade coil to make this efficient and simple 2 meter antenna. 1/2 inch stainless steel hose clamb attach coax shield here inches 4 turns of 50 ohm coax feedline rolled into 5" diameter coll. I'm trying to build a wave "Coaxial J-Pole" antenna, similar to what is described here: Such an antenna would be great for stringing up in a tree when operating remotely, no tuner needed. The J-pole antenna is a mechanical 3/4 wave vertical antenna. 2 meter antenna help Advertise Here I'm looking into getting started in ham radio and after doing a little bit of research I'm leaning towards getting a 2 meter mobile radio to either put in my truck or (most likely) use as a base station in my workshop. This is a great idea, as the packaging and shipping of a 5 foot antenna is extreme when compared to purchasing a length of PVC. At the end of the class, you will come away with a working J-Pole that you can mount inside or outside to help hit those distant repeaters. Since the resonant frequency of my antenna was low it meant that my antenna was a little too long. Optional: Build a Balun and buy or build an antenna tuner. They're simple to build, and using my favorite set of plans, the SWR in the repeater portion of the band has always been 1. To test the Coax you will need a 50 ohm Dummy Load and an SWR Meter or Antenna Analyzer. M2 Antennas 2M4 2 Meter Yagi Antennas are 4 element beams on rear-mount 48 in. Tuning Your 6-Meter J-Pole You can use a capacitive coupling strap to easily tune your 6-meter J-pole for a different portion of the band. For more LAVA J-Pole Wholesale & Other LAVA Antenna Products LAVA J-2012 Universal J Mount for HDTV Antenna - Fits most HDTV Antenna. This MFJ Pocket Roll-up is the perfect gain antenna for traveling. attach (tv-wrap or tape) to copper mast *** use extreme caution using propane "benz-o-matic" torch soldering copper parts together k4abt 6 "j" pole antenna; dinensions are for 51. A dipole design for the 20-meter band is an efficient and inexpensive antenna for the novice and veteran ham enthusiast alike. In their place, cut slots in each cap to a depth of at least 2/3 the width of the aluminum flat stock used. The 2-Meter 300 Ohm TV Twin-lead Roll-up J-pole. 5:1 or better over the entire band. Chris recalls a team event last year where they needed to get on 40m fast so a fishing pole and about 10 meters of wire were produced along with 2 elevated radials. 42 meters or 11 feet 2 inches long from the top of the mounting spring to the tip. The plans are readily available online from a number of sources. Many RASON members truly enjoyed last month's collinear antenna. By comparing them, you should be able to construct a tuner to your own particular requirements. You are ready to fire up the your collinear! See figure 7. 2m/70cm Vertical Dipole Antenna Easy to make, super easy no trim tuning Cubical Quad Antennas Ham Radio 2m Backpack Quad Antenna Coat Hanger / Copper Wire 2 Meter Yagi Antenna 2 Meter Yagi Antenna w/ Gamma Match Dipole and Inverted V Antenna Basics 10/15/20m Trap Vertical Antenna Dave Tadlock helps you build a home brew trapped vertical. The theory for a single band J-pole is first described. The antenna is designed to be fed with 50 or 75 Ohm Coax Cable of most any length with a Balun. The J-Pole antenna is a common omni directional antenna used in amateur radio, particularly on the VHF and UHF bands. This equipment receives cable television signals from a hilltop-transmitter a few miles away, and feeds them to a receiver (mounted on the pole a few feet above ground) that converts them to standard NTSC signals for distribution to the local community. This is the same antenna that is in the ARRL Antenna Compendium Vol 8 titled “True Dual Band roll-up portable J-pole”. The cost to build this antenna is less than $2. 46 Antennas, A Rugged J-Pole. I built mine from 3/4. How Does it Work? Fabulously!. To manage this you’ll need the following things : a wire coat hanger or a piece of iron wire (length 35-40 cm, wire diameter 2-4 mm), 2 connector blocks, a wireless antenna, a high quality coaxial cable of at least 10 m or an ordinary TV cable, pliers, wire cutter and a screw driver. The great thing about J-Pole antennas is their simple design and excellent performance. It is an outstanding performer, especially when you get it up in the air. The 2-Meter 300 Ohm TV Twin-lead Roll-up J-pole. A balun is necessary because a J-pole antenna uses a balanced feed (the 1/4-wavelength matching section) connected to an unbalanced feed line (the coax). The idea came to me - install the dish on a steel pole, and mount a 2-meter J-pole antenna with it? The antenna will be outside at a higher elevation, and at least partially hidden by the dish. Then I have about 15' of coax that screws to the match box and I run it into my car window to my operating position in the drivers seat. 2 Jetstream JTMHF10 10m Mobile HF Stick Antennas. I have been using it for mostly 15-20 meter and 2 meter. The detailed construction drawings, sheets and. Construction Plans for the Arrow Model J146/440. Make payment securely with a payment option you are comfortable with we accept payment through offline as well as online modes we make sure proper documentation is. 8mhz Inverted-L Antenna; Bent Dipole antenna; 7-MHz Loop Antenna; Loop Skywire antenna; 70 CM UHF 6 Element Yagi Antenna; 3 Element VHF Yagi for 2 meters; J-POLE vertical antenna; VHF/UHF Dualband vertical antenna; 20m mini loaded dipole; A simple long-wire antenna for. 1dB gain over isotropic). › Scanner signals work on line-of-sight, not satellites, so anything from a tree to a hill can inhibit signal. The antenna plans includes design dimensions for 2 meters, 220MHz, 440MHz and 810MHz. By this time, the entire antenna has made its way into the pvc along with several inches of the coax cable. Being the crafty maker type, I wanted to build my own antenna. The most common antenna used is a Yagi with many elements, such as the M2 2M9SSB antenna or the portable Arrow models. The 34 foot long Alpha J-Pole Jr Antenna can handle 500 watts PEP SSB (200W CW or 50W Digital). Don’t forget On most of the J Pole designs out there, a choke should be used as close to the feedpoint of the antenna as possible to help prevent rf on the feedline and creating difficulty with SWR readings. If you searching to evaluate How To Make A 11 Meter J Pole Antenna Youtube How To Make A 11 Meter J Pole Antenna Youtube price. MFJ-347 Dipole Mount. Some swear by it but I am sorry , I have never heard one that worked that well. In this video, Dave Tadlock (KG0ZZ) show us how to make a 2 Meter J-Pole antenna suitable for emergency or portable operations. AN ALL-COPPER 2-M J-POLE Rigid copper tubing, fittings and as-sorted hardware can be used to make a really rugged J-pole antenna for 2 m. The video is well-organized and easy to follow. Build a DIY 2 Meter J-pole Antenna If you are looking for an inexpensive, and easy to construct antenna, the J-pole antenna is a great one! In about an hours time, and about $15 worth of materials, you can have a great performing omnidirectional. You are ready to fire up the your collinear! See figure 7. No, it is not a halo - it is a folded skeleton-slot antenna. You can only transmit radio if you have a ham radio license, but you can listen to communications on satellites without a license. 1dB gain over isotropic). 2 Bit J-pole project Dave Prince WB0RAZ. But instead of simply trying to load a two-meter jpole on 70 centimeters and proclaiming it to be a "dual bander", the B-Square dual-band j pole is a true two-band antenna. 42 meters or 11 feet 2 inches long from the top of the mounting spring to the tip. So, How Many? - You can make a lot of contacts and construct a superb HF to UHF station with just two quite simple antennas. Copper Cactus Dual-Band Super J-Pole Antenna Projec t Your going to like this super J-pole project, This home made j-pole is easy to build and sturdy, While looking for an jpole antenna project to build I remembered seeing a Marine antenna called the Super J-Pole in the 1988 ARRL Antenna Handbook, which claimed a 6 db gain over a quarter wave. The 2-meter roll-up J-pole is lightweight (approx. The J-Pole is an excellent antenna for working the local repeaters and 2m simplex voice and digital. This is important because if the mast extends above the antenna ground plane it will affect the performance of. antenneX ~ October 2002 The Sperrtopf Antenna for the Two-Meter Band ~ Page 2 From the drawing in Figure 1, you can see that the radiator is about half a wavelength long and that the bottom part is a quarter wavelength long. Find out how a J-pole amateur radio antenna works! Subscribe: https: Building And Tuning 2 Meter 144 Mhz Copper J Pole Antenna - Duration: 10:09. Some of the antennas presented here were designed to be used for both 2-meters and MURS. Changing NanoVNA firmware. If you are in a search for an Ideal Beam Antenna; you can go ahead with this project. It must be placed as high as possible, properlymatched to the transmitter, and designed to effectively radiate the powerapplied to it. This is particularly true of the lower 3 MURS channels. An interesting fact to note is that ½ wave center-fed dipole- type antennas will resonate at odd harmon-. ARRL Antenna Projects — variety of antenna projects from the ARRL. If our antenna is for two meters, the wire length will be less than 8 inches overall. a ground plane only consists of a SO-239 found at Fry's and some Shacks and wire from a coat hangers or the stuff used in wiring houses. Since the resonant frequency of my antenna was low it meant that my antenna was a little too long. In this video from Pityu Nagy (YO6PNQ), we learn how to make a simple, inexpensive 5/8 wavelength antenna for the 2 meter amateur radio band. This is the third antenna. 223-MHz antenna gets you going on 11/ 4 meters in a hurry. Building a 2-Meter Moxon. Dual Band VHF/UHF Slim Jim Antenna. The problem was that the fishing pole was only about 7 meters long. It should be remembered when considering its use that the quad, when fed at the bottom gives horizontal polarisation. No cutting or lengthening necessary! You can make the strap from a 1-inch wide strip of aluminum foil. BUX BALUNs are used to connect balanced antennas to unbalanced transmission lines, such as coax cable. 11 Meter long wire27 mhz antenna, NL3ASD: 11 meter Moxon Antenna suitable for 27MHz CB: 11 meter j pole end fed antenna: 27 MHZ 1/2 Wave Dipole: 4 element yagi for 27 MHz: An EH Antenna without Coaxial Feeder Cable: Antena plano de tierra: Antenna Bazooka for 27. So, I suggested he build a 6m J-pole. The Texan ham needed to hit a repeater some distance away, so he built a stealth J-pole antenna disguised as a flowering vine. The directions don't show you this, but you can use it for a 2 meter j-pole. Building these antennas are difficult because of the scarce availability of materials. 50 SO-239 to BNC (male) $2. 2 meter collinear by m3fvb. An Easy Dual-Band VHF/UHF vertical Antenna made with a TV twin lead and coax cable. The ¼ wave stub cancels out ¼ wavelength of the ¾ wavelength radiator, thus leaving ½ wavelength to radiate. The antenna is designed to be fed with 50 or 75 Ohm Coax Cable of most any length with a Balun. Attach the radials to the holes in the flange of the SO-239 connector with nuts and bolts. AN ALL-COPPER 2-M J-POLE Rigid copper tubing, fittings and as-sorted hardware can be used to make a really rugged J-pole antenna for 2 m. You'll not need the 43-inch element. I have enough wire to make a 1/2 wave upper section but I am a little stumped on the bottom section. More information, call us at 1-800-707-3524 or visit our store for pilot car supplies and discounts. Impedance matching is accomplished by using a "J Pole" driven element fed by coaxial cable. TeleScoping Poles. Most hardware stores don't carry it anymore. The Apartment Antenna covers 40 through 2 Meters, mounts outdoor to windows, balconies, railings, and works great indoors mounted to The MFJ-1622 Apartment Antenna covers 40 through 2 Meters, mounts outdoor to windows, balconies, railings, and works great indoors mounted to desks, tables, and bookshelves!. I realize this statement will confuse and maybe even offend some people, but it's true never the less. We build a do it yourself copper 2 meter j-pole that i found on the net. The N9TAX Slim Jim antenna is the highest quality roll up antenna available today. A half wave radiator fed at one end presents a very high feedpoint impedance, at least several thousand ohms. When trimming an antenna for tuning you should trim less than the calculated difference to be on the safe side. 223-MHz antenna gets you going on 11/ 4 meters in a hurry. Use AntennaWeb. Don't bother with a J-Pole, Slim Jim, or anything with gain. Antenna Topics — wide variety of antenna projects. This MFJ Pocket Roll-up is the perfect gain antenna for traveling. The most common antenna used is a Yagi with many elements, such as the M2 2M9SSB antenna or the portable Arrow models. this is the best dual band j-pole ever built 2m - 70cm direct connection beam dimenisions. 22 September 2003. MFJ-1890 10 Meter Moxon Antenna (Tested on 10 meters & 11 meters/CB Band) MFJ MOXON Quick Look From CBRADIOMAGAZINE. But what about all the metal in the TV dish? Wouldn't that compromise a 2 meter antenna? Finally it struck me, don't fight the metal; take advantage of it. His antenna position is very poor: he lives in the bottom flat of a 5-floor building. The only drawback to this antenna is the cost of copper pipe used for the antenna sections. Radio Shack # 21-961 3/8"-24/SO239 Mount (Mobile CB Antenna). • For best results make sure that the shorted part of the quarter-wave feed section is above the support. The RFP 2SC2879 Transistor (Toshiba 2SC2879/2SC2879A equivalent) is now in stock! August and September purchases are limited to 4 per order. As an SWL, I was very much interested in antennas and its construction. Since I have all the tools for copper pipe work from when I use to have a house. I have covered J-Poles quite a bit on this site [2]. The Slim Jim, designed by the late Fred Judd, G2BCX, can be a great portable 'roll up' antenna, if made out of 300Ω or 450Ω ladder line / twin feeder. Snake the twin lead “J Pole” down into the pipe from this same end. The MFJ-1890 is a lightweight aluminum antenna designed to operate in the 10 meter band and we had hoped that with a little messing around we could get it to tune to the 11 meter cb band. ventional 2-meter J-Pole? First of all, a half-wave 2 meter antenna does resonate at UHF. The DBJ-2: A Portable VHF-UHF Roll-Up J-pole Antenna for Public Service WB6IQN reviews the theory of the dual band 2 meter / 70 cm J-pole antenna and then makes detailed measurements of a practical, easy to replicate, “roll-up” portable antenna. But what about all the metal in the TV dish? Wouldn’t that compromise a 2 meter antenna? Finally it struck me, don’t fight the metal; take advantage of it. A length of Coaxial Cable, preferably RG-8X or RG-213U to keep losses low. With tubing elements, an additional shortening factor starts to become important. I like the idea of putting this up with just a very simple assembly, and it works great right out of the box. The design would theoretically provide an impressive 9db gain (a claim that has generated some debate online) over the discone antenna I was using at the time. Arrow Antenna is now offering FREE SHIPPING on orders over $100 and $5 Flat Rate Shipping for orders up to $100 to the lower 48, Flat Rate Shipping of $15 for all orders to Alaska and Hawaii and $30 for US Territories and APO. How Hernan, LW5DTZ did the Gamma-match. It could serve as well to support a wire sloper or an inverted "V", or. I have a 10 meter wire dipole up now connected to a Radio Shack HTX100 so I can listen to 10 meter CW in preparation for my code and General exams in October. This MFJ Pocket Roll-up is the perfect gain antenna for traveling. Within this physical description there are two distinct antenna types. You have now gotten the last 0. Many RASON members truly enjoyed last month's collinear antenna. This is very handy and can even be set up inside, on a very low power of course. What I am talking. A friend of mine (KC0UYK) convinced me I should build this antenna and I’m certainly glad he talked me into it. At the end of the class, you will come away with a working J-Pole that you can mount inside or outside to help hit those distant repeaters. The plans are readily available online from a number of sources. As such, it will have a higher radiation angle component on 70 cm than on 2 meters, so 70 cm re-. OSJ - Model OSJ 146/440 Dual Band J-Pole with Extra Labor Charge for Two Piece Element (Will also fit in the Antenna Bag if ALL the elements are removed from the bracket. M2 Antennas 2M4 2 Meter Yagi Antennas. No cutting or lengthening necessary! You can make the strap from a 1-inch wide strip of aluminum foil. I use mine on a daily basis on my Winlink 2000 station. Steve, Just to let you know HOW good 10 meters is. This provides weight and stability in the bottom of the flower pot. I like the idea of putting this up with just a very simple assembly, and it works great right out of the box. A balun is necessary because a J-pole antenna uses a balanced feed (the 1/4-wavelength matching section) connected to an unbalanced feed line (the coax). I really like the ability to feed this preamp VHF and UHF antenna cables, thus eliminating the need for a seperate signal combiner. Not too bad for an antenna that cost roughly $35 to make. › Scanner signals work on line-of-sight, not satellites, so anything from a tree to a hill can inhibit signal. 2:1 SWR or less at 146MHz), and the SWR is 1. This would make an excellent emergency 2 meter antenna for your club or home station. For a 2 meter f = 146 MHz J-Pole antenna, the 1/2 wavelength radiating section (Section A) is equal to A = 0. The J-Pole is an excellent antenna for working the local repeaters and 2m simplex voice and digital. ventional 2-meter J-Pole? First of all, a half-wave 2 meter antenna does resonate at UHF. Let me begin by stating that a J-Pole antenna, is like all open end antennas, a form of Di-Pole!. 2 Meter Copper J-Pole Antenna After two informative presentations from Allen Wolff KC7O, first on soldering technique and then on constructing a 2m cooper j-pole antenna, SPARC members held a group build as our October meeting. com in 2 categories. Again, no need to beat your head against the way trying to string up a 50 foot tower. Cut the wires next to the rivets on the 43-inch element. It includes an L bracket mount with U bolts to attach directly to the J Pole. Thanks to Pityu Nagy for this fascinating video on how to make a 5/8 J-pole antenna for 145 MHz. 2 meter/440 “j” using cb whipn6jsx. There is really no theory in this series, just building the antenna. I needed another antenna so today I. Radio Shack # 21-961 3/8"-24/SO239 Mount (Mobile CB Antenna). - 2 - Congratulations! You are now the proud owner of a Comtek 20 Meter Vertical Antenna. Edison Fong (DBJ-1) J Pole; Edison Fong (DBJ-2) J Pole Roll Up; Edison Fong – Tri-Band Antenna for 2m, 1. Attach the radials to the holes in the flange of the SO-239 connector with nuts and bolts. In terms of 2 meter performance, it appears to be working better than my Ringo Ranger II, which is mounted outdoors with the tip about 35-40′ up in the air (FYI, the Ranger II has an estimated gain of 7+ db. You may be surprised to discover how easy and inexpensive it really is to build your own tower. Unfortunately, they all fall short by not telling readers how to tune the new antenna. J Pole Antenna for 2 Meters. J-Pole Antenna Product Description The airband J-Pole antenna is tuned for the 118 - 128 MHz aircraft aviation band. wanted plans: j-pole 440. Thus it is about 3/4 wave tall at the operating frequency. Wow, Perfect. Next step for me is a 10 meter antenna - I haven't decided what to build yet. 60 For the correct velocity factor, the following is recommended:. 4-1 at 144 &148 MHz. Parts Needed. The two meter antenna is tuned to 146MHZ (1. Construction: The SWR should be less than 2:1 across the entire two meter band. For instance, the J-Pole antenna design for 2m/440 ops is a very popular homebrew project, and it can be created with simple aluminum from the hardware store or even from segments of twin lead feed line. This was our in! The flagpole kit came from Lowes and cost $29. 2 dBi, 0 dBd. It has gain and wave angle comparable to a full-sized ¼λ ground plane antenna with radials. There are times when you may need more gain than the standard J-Pole antenna. There are several features which make the ubiquitous Twinlead J-Pole antenna a good addition to your emergency grab-n-go kit. Sounds complicated, but it really isn't. A length of Coaxial Cable, preferably RG-8X or RG-213U to keep losses low. To some, the antenna will look familiar. This provides weight and stability in the bottom of the flower pot. The length of a full-wave antenna is given by the formula 1005 / frequency in MHz = total length of the loop. For A while now I have been pondering practical ways to build a 20 meter J antenna mostly for the grins and giggles of doing it. With tubing elements, an additional shortening factor starts to become important. Forrest Cook WB0RIO. The difference in the calculated values of a 1/4 wave length antenna at 50MHz vs. How to Calculate VHF Radio Antenna Length By Andy Pasquesi ; Updated April 12, 2017 In radio frequency (RF) terminology, the Very High Frequency (VHF) range is the signal spectrum from 30 to 300 megahertz (MHz). Obviously, it is necessary to combine the two antennas. He loved working 20 meters, but the housing community he moved into prohibited antennas that could be seen by the public. The resource is currently listed in dxzone. The jumper line between the antenna and hard-line is shot and I will have to wait to spring to replace. 2 Meters—An All-Copper J-P01e By Michael P. We will use this wavelength equation for all of our calculations. Number 8 solid copper ground wire is an easy to find source for element material. , a 2-meter vertical, a 40-10 Meter Off Center Fed (OC F) Dipole, and a 10-meter rotatable aluminum dipole. The Dual-Band Open-Stub J-Pole Antenna Built out of heavy duty 3/16" angle aluminum, UHF SO-239 connector with 3/8 aluminum elements and all stainless steel hardware. Some of the antennas presented here were designed to be used for both 2-meters and MURS. 5 (11244 / 146) = 38. 500 MHz: Antenna Moxon Antenna Plan for 27MHz CB: Antenna EH autocostruita per i 27. there was a simple way to convert a 2 meter J-pole into a dual band J-pole DBJ-2 was developed from the successful performance of the DBJ-1 but folks requested a portable version. The J-Pole does not require any ground radials and has a antenna gain of 2. 2 Meter Turnstile Antenna For Amateur Satellite Communication. First, it is a very effective broadband two-meter j-pole, ready to work beautifully anywhere in the band and beyond. The 34 foot long Alpha J-Pole Jr Antenna can handle 500 watts PEP SSB (200W CW or 50W Digital). 5 inches and the 1/4 wavelength stub section (Section B) is equal to.