Dual Band J Pole Antenna

The J-pole and other end-fed Hertz antennas are prime examples of antenna that can have severe feed line common mode current problems. The material used was 4 mm iron wire. On October 1st. In this antenna the feed is connected to an intermediate point along the length of the antenna instead of to the base. 1 out of 5 stars 72. But how do these things work? Here is a great presentation from Dr. At the VECOM meeting this morning I showed off the Ed Fong Dual Band J-Pole that I had just bought. Shantha Selva Kumari, M. Yikes! Kinda scary. What others are saying J-Pole Base Antenna 2 meter Dual Band Heavy Duty Amateur Ham Radio Scanner 2 Meter 70cm Dual Band J Pole Antenna 144/ 440 Mhz Ham Radio With Weather Boot. The 1Notes appear on page 40. SWR should be < 1. If you are interested in a copy, send me an e-mail!. How do you choose a J-pole antenna on eBay? When you are shopping on eBay for an affordable J-pole antenna, consider its: Band of operation: These antennas offer operation on HF, VHF, and UHF bands. Clearing them fixes certain problems, like loading or formatting issues on sites. 2-1 from 440 - 450 MHz. 95; Tax included. This antenna is also known as the “copper cactus” (because it kind of looks like one of course!). 144 / 430 Dual Band J-pole antenna; 10 Meter 4 Element Quad Antenna; 144 Mhz Magnetic Loop Antenna; A "loopy" Loop Loaded Vertical; W5GI Mystery Antenna; A Multiband Dipole; Build a W3DZZ Antenna; A portable 2-element VHF yagi; Assembling GAP Titan DX Antenna; The Galaxy Dipole; Pfeiffer Maltese Quad. This is a J-Pole project I put together one night. Since then I found a good technique to overcome that problem. We've had two J-poles break during landing, but they are very easy to make. At the base, a quarter wave matching stub forms the classic 'J Shape'. For 3-meters (FM broadcast band) it is probably the antenna that is the best solution for many micro power radio stations. "Buck" Rogers Sr Practical Antenna Handbook by Joseph J. It is a vertically polarized antenna with two elements: a ¾ wavelength radiator and a ¼ wavelength matching stub. I saw the plans for this on the internet (link to plans) by Allen Lowe (N0IMW). antenna, so in others it must radiate less energy. Although traditional VHF J-pole antennas will resonate at UHF, they suffer a -6dB loss at UHF over a ¼ wavelength groundplane. That first. So it appears it could be, below is the photo and the link to where the antenna can be purchased on line: Maybe worth keeping an eye on this seller as recently he had a 934Hz CB antenna for the car for sale. Add to Cart J-pole antennas have made a name for itself because of its high. On October 1st. I have two different plans that I found on the internet. For 3-meters (FM broadcast band) it is probably the antenna that is the best solution for many micro power radio stations. I have seen this basic diagram in at least five different sites. Includes adapters for BNC, SMA and SMA - female. I mount it on a photography tripod stand and connected to an Icom IC-V86 HT Radio. While I was at the Hood County Site, I visited with Scot, KG5RKX, who was operating the QRP station. went together easily. by Mike Walkington, VK1KCK. by Al Peter, AC8GY. Halo antenna for 70Mhz; Halo for 6 meters band; J-Pole antennas; Mirrored J-pole; Simple double-quad Antenna; Single Coax Feed to Multi-Band Copper Cactus Antenna; Single band copper pipe "J' Antenna; Six Meter Wavelength Band Antennas; The Copper Cactus Antenna; The Handi-Tenna 70 cm Portable Antenna; The SIMPLE 2m/440 Copper pipe "J" The. As a vertical radiator, it has a flatttened-donut omnidirectional pattern, sending a radio signal exhibiting a gain of about 2. December 11, 2017. These are also cheap to make and was passed on to me from another ham and i thought I would pass. DBJ-2 Ed Fong 12/14/2013 1 VHF/UHF Dual Band J-Pole By: Ed Fong WB6IQN email: [email protected] J POLE ANTENNA DESIGN CALCULATOR by K4ABT; Design your Own Super J Pole; Pocket J-Pole Antenna for 2 Meters; Copper Cactus Dual-Band Super J-Pole Antenna Project ; very good resource about j-pole antennas, with detailed photos; 2-meter J-Pole from bicycle safety flag; J-Pole Antenna Help Information; Some J-Poles That I Have Known. What can I do? A: Try adding a balun to the coax. UHF ¼ wave mobile UHF rubber duck Standard VHF J-Pole Dual Band J-Pole -38. 4 m vertical antenna for 40 meters band: a new antenna to test, easy to setup in portable mode. These are also cheap to make and was passed on to me from another ham and i thought I would pass. 5 or lower across the 2 meter band and the 70cm band also. Edison Fong. It has a SWR of 1. See the eham reviews at this link. Maximum Power - Only been tested to 1,000 Watts, it may take the whole 1500. Dual Band (2 Meter/70 cm) Solid Aluminum J-Pole. We already published in the 9 J-pole-antenna-projects some samples of copper J-Pole antennas. J-Pole Antenna: 2 M / 70cm HAM. Solid Aluminum Elements, Stainless Hardware. They look pretty weird, as can be seen in the following photo: The picture to the right is of a 2m amateur radio band J-pole I built from an EZNEC simulation. The antenna is tuned at the matching section by the sliding up and down of the feed points which can be time consuming and requires an swr meter or antenna analyzer. The above radiation plots were produced using MMANA Antenna Analyser software by JE3HHT, Makoto (Mako) Mori. Carr Design by G. As I was setting up my amateur radio station, one requirement was for 2M and 70cm antennas in two locations. I am now ready to go for a 2/70 antenna (dual band). J-Poles are not that easy to adjust. So, an antenna that looks like a half wavelength on 2m will look like 1. Trailed behind the airship, it consisted of a single element, one half wavelength long radiator with a quarter wave parallel feedline tuning stub. Hi! I need a J-Pole antenna to use with a Uniden 105XLT airband scanner. At the VECOM meeting this morning I showed off the Ed Fong Dual Band J-Pole that I had just bought. High band VHF/UHF Metro Antenna. 2-3 vswr in the center of 444MHz band as well (demonstrated on my dual-band meter and Alinco DJ-580). I don't have a tuner/analyzer so don't know what the SWR is, but others that have built them report less than 1. Dual-Band J-Pole" by Edison Fong, WB6IQN. A copper pipe J-Pole antenna is a single band antenna that is much like a. , but buried in the noise. HRO Discount Price: $58. A description is then given on how this dual band principal is applied to a fully portable "roll-up" J-pole antenna. This calculator can be used to design a Slim Jim or a J Pole antenna. One of which was a dual band Tape Measure J-Pole. 2018 mWAVE became part of the Alaris Holdings Group of companies, mWAVE Industries, LLC offers one of the broadest lines of microwave antennas in the industry specializing in solid and grid parabolic, omni-directional and multi-point antennas in addition to feeds including conscan and monopulse designs. This is my NEWEST deluxe model roll up Slim Jim/J-Pole antenna with 10' of coax! WHOLE ANTENNA IS 3 OUNCES and made to fit your rig! Are you looking for a truly portable antenna with BIG performance? This deluxe version is the same as my basic version but with 2 differences. I use a CB SWR meter to check 2M antennas all the time. I saw the plans for this on the internet (link to plans) by Allen Lowe (N0IMW). However, it is imperative that you use the proper coax for the highest band of operation, RG58 just won't cut it and even RG8 in lengths longer than 25 feet is marginal in 440 operation. 300 W twin lead J-Pole antennas are light and very portable. Ed Fong WB6IQN. This super efficient VHF / UHF antenna provides a OMNI directional 3 to 9 db gain depending on position and is usable in 4 positions. DISCLAIMER: Any links provided are for the reader's enjoyment. Base antenna systems for amateur ham radio HF VHF UHF - Performance, Quality, Service. I got a set of plans for a Dual-Band J-Pole that works AWESOME!! I use the antenna listed in the plans and Get EXCELLENT SWR and TX/RX. 2m/70cm Dual Band J-Pole by KK4ICE. (A more detailed explanation is given in my February 2003 QST article. Dummies guide to aircraft antennas Probably the single biggest issue that we encounter with the installation of our XCOM radios by customers in the field is poor antenna performance. SO-239 Connector. important because if the mast extends above the antenna ground plane it will affect the performance of the antenna. The testing result also revealed that the J-Pole-T antenna could transmit and receive radio signal as well. J POLE ANTENNA DESIGN CALCULATOR by K4ABT; Design your Own Super J Pole; Pocket J-Pole Antenna for 2 Meters; Copper Cactus Dual-Band Super J-Pole Antenna Project ; very good resource about j-pole antennas, with detailed photos; 2-meter J-Pole from bicycle safety flag; J-Pole Antenna Help Information; Some J-Poles That I Have Known. Both call for 1/2" EMT conduit. Once tuned, sweat the tubes to the straps so it stays put. The design is based on an article that appeared many years ago (1987) in CQ magazine, a version is produced by Arrow Antennas in the USA. The first one of MFJ-1724B Magnet Mount Mobile antenna burned-out the capacitor in the. 2/70CM “J” PORTABLE ANTENNA Plus a novel base support by N6JSX. The DBJ-2 package includes the pre tuned antenna, ready to unroll and install. A plain 1/4 wave ground plane for 2 meters will usually work adequately on 440, the third harmonic. How to build a J-pole antenna for the 2-meter amateur radio band using zip cord, vinyl electrical tape, solder, a 6-foot bicycle safety flag pole and a length of coaxial cable to connect to the transceiver. At the VECOM meeting this morning I showed off the Ed Fong Dual Band J-Pole that I had just bought. vhf - uhf band plan chat j-pole antenna super j-pole antenna cubic quad antenna arrow antennas dual band j-pole note: this antenna was disigned by arrow antennas and it works great. Dual band jpole | KB9VBR J-Pole Antennas. You have just found the webstore of the highest quality hand made portable antenna on the market. So, I decided that a pair of dual-band copper pipe j-pole antennas were in my future. I mount it on a photography tripod stand and connected to an Icom IC-V86 HT Radio. I am a new ham. Just finished this Dual Band J-Pole Antenna. The power. He is credited with original article in QST magazine. This is a GREAT little antenna for performance. Diagrams 300 Ohm twin-lead. Before I built any home-brew mobile VHF antennas, the only VHF mobile antenna I had was an MFJ-1724B Magnet Mount Mobile antenna. So it appears it could be, below is the photo and the link to where the antenna can be purchased on line: Maybe worth keeping an eye on this seller as recently he had a 934Hz CB antenna for the car for sale. So, I decided that a pair of dual-band copper pipe j-pole antennas were in my future. 2 Mhz) 5/8 Tunable 10m & CB Base Antenna, $135. The ring gasket makes the antenna water-proof, and. I've constructed a 144/440 Dual band Open Stub J-Pole Antenna. Also check out the J-Pole Antenna site. I mount it on a photography tripod stand and connected to an Icom IC-V86 HT Radio. It is a Diamond SG-7000 dual band. Wayde used a commercial NMO-style base and magnetic mount. 95 * Buy It. Here are the Plans I used. High Growth, Low SWR. The Buddipole™ - HFportable dipole antenna system, Welcome to the home of the Buddipole™, an hf/vhf portable dipole antenna system which is designed to be modular, versatile, and efficient. Dual Band VHF/UHF Slim Jim Antenna. N9TAX at UHF The two inline coaxial "chokes" N9TAX builds into his dual band antenna appear to have no functionality at all at UHF. J POLE FOR 220 BAND REPEATERS KG7GTE 2 METER SLIM JIM A first time builder shares his fun! The Vent Pipe “Lightning Rod” Antenna “Stealth on the roof” by N4UJW. Two DIY dual band antenna's I built for VHF/UHF. See the eham reviews at this link. In the Comms Forum, I posted a J Pole made from electrical Conduit parts, for 10 Meters If you take those dimensions and scale them up or down, you can design an Antenna, for any Band. Solid Aluminum Elements, Stainless Hardware. Ed Fong (WB6IQN) on eBay. Concept of construction. There are three connection possibilities to feed the multi-band copper cactus antenna with a single feedline or coax. A balun is necessary because a J-pole antenna uses a balanced feed (the. (can not obtain good VSWR on 440 but the 2m gain is outstanding - about 6dbd worth!) EXPERIMENT, create you own unique designs the "J" is a very forgiving, yet, robust and fundamentally versatile antenna that can let YOU put the technical design, development, and building. I mount it on a photography tripod stand and connected to an Icom IC-V86 HT Radio. K1YPP has provided a design for a weatherproof 300 W twin lead J-Pole by installing it in a PVC tube. J-POLE ANTENNAS. In my design I use 1/2" copper schedule M tubing and 1/4" soft copper tubing. This will lead to non-aligned segments in the two elements. The antenna is tuned by sliding it up or down in relation to the mount and straps. Before I built any home-brew mobile VHF antennas, the only VHF mobile antenna I had was an MFJ-1724B Magnet Mount Mobile antenna. Here is the 2m side. The material used was 4 mm iron wire. third harmonic is poor when the antenna is The A Portable J. by Mike Walkington, VK1KCK. Here is the 2m side. 2 meter j pole to slim jim conversion : antenna related antenna forum (off site) publish your antenna project all band "ugly" balun antenna programs de ve3sqb qy4 quick yagi program qrz design downloads k5at antenna links wave propagation antennas "the easy way" get a good ground! arrl technical info service how to use an antenna tuner. High Gain Dual-Band 2m/440 Handheld Standard SMA Antenna Increase your handheld's VHF/UHF performance with this high gain antenna. 73 N4Zq Here's an extract from one from my WWW pages (with a copy of the linked page). - $30 DBJ-2 (commercial) dual band roll up antenna kit - (152-157 MHz and 460-470 MHz). The material used was 4 mm iron wire. Each panel is specially designed to work with the two frequencies used in dual-band systems. Reports in the field say this J-Pole antenna outperforms antennas such as the a Ringo Ranger. MFJ-1890 10 Meter Moxon Antenna (Tested on 10 meters & 11 meters/CB Band) MFJ MOXON Quick Look From CBRADIOMAGAZINE. It offers true ½ wavelength performance at both VHF and UHF with no ground radials. Made from an old CB antenna, "reused". Modified Aluminum Dual Band J Pole ('Arrow') Antenna for Fiberglass Body Mini RV By KK6VLV. A J-Pole Antenna for the 27Mhz (11m) CB frequencies. As I was setting up my amateur radio station, one requirement was for 2M and 70cm antennas in two locations. We offer a very big assortment of items ready for shipping at good costs. But how do these things work? Here is a great presentation from Dr. KB9HGI Cactus Dual band J-pole Dual band Cactus j-pole This is a very easy and simple 2 meter/70cm vertical antenna. You have been given the responsibility for buying Communication Radio Supplies. Most customers are simply unaware that a poor antenna can affect their radio performance substantially and they mistakenly expect that. New Mediasonic Homeworx Outdoor Antenna Pole 38 ft. Arrow Dual Band J-Pole - 2-Piece Ele OSJ146/440 ELC 5. Visitor Comments. Yes, I built one and it seems to work just fine (at least on 2m and 440, I don't have 220). Gain of about 3dbi, better than a 1/4 wave ground plane antenna. I mount it on a photography tripod stand and connected to an Icom IC-V86 HT Radio. Scaling them for other bands is quite straightforward - In this example, I'm making it for the 144-146MHz (UK allocation) 2m band but you will find that it works reasonably well on 70cm, as well. This super efficient VHF / UHF antenna provides a OMNI directional 3 to 9 db gain depending on position and is usable in 4 positions. pdf is worth reading. The theory for a single band J-pole is first described. A balun is necessary because a J-pole antenna uses a balanced feed (the. 5 out of 5 by 14. The antenna's UHF pattern matches that of his single band antenna at the 3rd harmonic confirming the currents are not contained below the chokes. 2 dBi on 70 cm fairly equally in all directions parallel to. Notes: The J-pole antenna is a half wave radiator fed by an included 1/4 wave matching section. DBJ-2 Ed Fong 12/14/2013 1of 27 VHF/UHF Dual Band J-Pole By: Ed Fong WB6IQN email: [email protected] 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. Since I had a Metal Fabrication background, I th…. It is a quarter wave on 2 meters and a an open-stub J Pole on 440. The first one describes the antenna and has a link to the 2007 article and the second is ordering information. He has a guide for especially Baofengers about using external antennas on your radio, the why and more importantly the how. tional single band ribbon J-Pole design to dual-band operation. The idea of a folding version of the copper antenna appealed to me. They work great for amateur radio, public safety, scanner listening, business band, and GMRS purposes. Add to Cart J-pole antennas have made a name for itself because of its high. Check out the video to see a general overview of the antenna. Concept of construction. What I keep in my toolbag for that is a cheapie $5 hamfest special CB SWR meter. Any rig you can protect from an EMP, the critical task then becomes antenna, antenna, antenna. 144-430 portable j-pole antenna A portable dual band j-pole antenna 2 Meter J-pole from 450-Ohm Ladder Line Great first time J-pole project. Built out of heavy duty 3/16" angle aluminum, UHF SO-239 connector with 3/8 aluminum elements and all stainless steel hardware. Trailed behind the airship, it consisted of a single element, one half wavelength long radiator with a quarter wave parallel feedline tuning stub. My workshop under the garage needed to have a separate antenna, preferably hung from a nearby tree. The top part of the main element was the 70-cm j-pole and was fed via coax through the main element. A close look at how the J-pole antenna works with special attention to how it's fed. 50 [120 MILES] Fosmon WHITE Indoor Digital TV HDTV Flat Antenna UHF/VHF/1080p 4K [120 MILES] Fosmon. (6,0 dB) Specifications EA4J. Copper Pipe J-Pole Antennas By Rory Eikland, KG6HCU and Ken Larson, KJ6RZ Rory and I have had excellent experience building and using J-Pole antennas constructed from 1/2 inch ridged copper pipe, so we decided that we would share our experiences. this is the best dual band j-pole ever built 2m - 70cm direct connection beam dimenisions. The ubiquitous dual band j-Pole antenna, the SE-DBj covers 144 to 146 Mc. The bandwidth is broad to cover the entire Amateur Radio. So dual band J-Pole arrangement is a bit tricky, and thus the strange dual stub arrangement of my old copper pipe antenna. 6 dBi on 2 meters and about 5. Simple Ham Radio Antennas A Hawaii-based Amateur Radio Antenna Blog focusing on the theory, design, and. I am no expert in antenna design but enjoy playing with different ideas. Although traditional VHF J-pole antennas will resonate at UHF, they suffer a -6dB loss at UHF over a ¼ wavelength groundplane. The radiation pattern of J-pole-T antenna showed an omnidirectional shape. Covers most of the basics. One place that I like to save is by constructing my own antennas. It fits in the top of the box. tional single band ribbon J-Pole design to dual-band operation. High Gain Dual-Band 2m/440 Handheld Standard SMA Antenna Increase your handheld's VHF/UHF performance with this high gain antenna. Direct element joint structure with two interconnected FRP outer-shells. Best Ham Radio Dual Band J-Pole Antenna, Aluminum Cheap. The original owner of Arrow antennas (not sure if he still is) published the design but the How-To was a text document with some neato ASCII art. 47 dB Table I Measured relative performance of the dual band antenna at 146MHz. J Pole Antenna for 2 Meters: This is a quick video of a simple J Pole antenna build for 2 meters. Q: I built the dual-band J-pole antenna from the article in the September 1994 New Ham Companion (“An Easy Dual-Band VHF/UHF Antenna,” page 61), but I just can’t get it to work. I am no expert in antenna design but enjoy playing with different ideas. went together easily. While I was at the Hood County Site, I visited with Scot, KG5RKX, who was operating the QRP station. DBJ-2 (ham) dual band roll up antenna kit - (144-148 MHz and 440-450 MHz) Includes adapters for BNC, SMA and SMA - female. A plain 1/4 wave ground plane for 2 meters will usually work adequately on 440, the third harmonic. No endorsement may be inferred from the mere listing of a URL or link. The J-Pole antenna is a 1/2 wave antenna with a 1/4 wave matching stub. PETRA INDUSTRIES Amateur Dual-Band Base Antenna with 17 ft. Here is a link. com My name is Michael, KB9VBR, and I carry a full line of VHF and UHF antennas for sale. Visitor Comments. If you have any questions about this project, contact [email protected] The 2m/440 Super J-Pole. gif J-Pole for 146 MHz (BuxComm). J-Pole Antenna Plans (these files are now located on our web server) Dual Band Jpole. It is an outstanding performer, especially when you get it up in the air. 5 wl antenna. 2 meter home built collinear antenna. this is the best dual band j-pole ever built 2m - 70cm direct connection beam dimenisions. The Dual-Band Open-Stub J-Pole Antenna. It is a vertically polarized antenna with two elements: a ¾ wavelength radiator and a ¼ wavelength matching stub. 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. Maximum Power - Only been tested to 1,000 Watts, it may take the whole 1500. 57 This is my NEWEST deluxe model roll up Slim Jim/J-Pole antenna with 10' of coax!. The snap tee stand off is 10 inches above the base of the antenna as instructed and am using brand new lmr400 cable. Just ordered my handset - BaoFeng Dual-Band MHz FM Ham Two-Way Radio (Black) Came highly recommended !. 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. All information, images, and documents on this website are the sole property of MFJ Enterprises, Inc. home made collinear antenna. Some great uses for these antennas are: Camping; Hiking. Shantha Selva Kumari, M. J-pole Antenna. I simply unrolled the antenna and hung in place. This antenna is also known as the "copper cactus" (because it kind of looks like one of course!). Home / Tag: Dual Band J-Pole Tag: Dual Band J-Pole You may recall a review I did quite a while ago on the superyagi j-pole antenna for civil airband. With an SWR of 1. Our flagship model, The Two Meter J-Pole Antenna comes in two different configurations, either as a one piece antenna for base station use, or as a two piece breakaway model great for portable operations. com ARRL VHF/UHF Antenna Classics ARRL Vol. I am no expert in antenna design but enjoy playing with different ideas. All I did was make it in 3D and make a set of drawings that people can easily understand. Reduce precipitation static and lower background noise with the Tram Amateur Dual-Band Antenna. First I tried the antenna in the attic, and was able to hit a few 2m repeaters, then I bolted to antenna to the roof outside, no change in performance. Fret not J-Pole lovers. 2m/70cm Dual Band J-Pole by KK4ICE. CB Antennas. True Dual Band base station antenna. I built one of these myself and seems to work quit well. We call the antennas Slim Jims and they pack a lot of punch but do not unpack your wallet. Two DIY dual band antenna's I built for VHF/UHF. High band VHF/UHF Metro Antenna. I built an Ed Fong DBJ-1 from the QST article about a year and a half ago (you can also buy them from Ed on ebay). J-Pole Antenna Plans (these files are now located on our web server) Dual Band Jpole. 2003 QST and designed by Dr. Here are the Plans I used. 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. Watch TV for FREE with an indoor or outdoor HDTV antenna. It is hard to use a computer and a microphone at the same time. Dual Band (2 Meter/70 cm) Solid Aluminum J-Pole. These are also cheap to make and was passed on to me from another ham and i thought I would pass. It works for 2m and 70cm. Q: I built the dual-band J-pole antenna from the article in the September 1994 New Ham Companion ("An Easy Dual-Band VHF/UHF Antenna," page 61), but I just can't get it to work. About the J-Pole. I've constructed a 144/440 Dual band Open Stub J-Pole Antenna. My antennas have a low noise floor and a beautiful omnidirectional radiation pattern. To construct the antenna, first select a suitable length of grey 25mm conduit (as a minimum 1m but if you make it longer, you will have more room below the coil to attach to your antenna support). He has a guide for especially Baofengers about using external antennas on your radio, the why and more importantly the how. I saw the plans for this on the internet (link to plans) by Allen Lowe (N0IMW). As I was setting up my amateur radio station, one requirement was for 2M and 70cm antennas in two locations. If you are interested in a copy, send me an e-mail!. The DBJ-1 is easy to construct using. Arrow Dual Band J-Pole - 2-Piece Ele OSJ146/440 ELC. Don't be fool by claims of dual band performance. Bandwidth is normally 10 MHz. This page is broken 🙁 I've assigned my best minions to fix it up - KB3KAI. Форум » Радио » Антенны КВ и УКВ » Dual band J-pole 144/430 mHz 3/8" x 24 Thread CB / Ham Antenna Mount w/ UHF / SO-239 Connector. Shown is empirical evidence why this is a problem and a very simple solution all future grounded j-pole antennas should incorporate. At the VECOM meeting this morning I showed off the Ed Fong Dual Band J-Pole that I had just bought. third harmonic is poor when the antenna is The A Portable J. 2m & 70cm dual J-Pole : Version 2: This antenna is the "bee's knees" for a single connection dual antenna for both the 2 metre and 70cm band. Since then we have become the largest manufacturer of Amateur, CB, and Scanner antennas and accessories in the UK We are also the largest local authorised dealer for Alinco, Kenwood, Icom, Yaesu and Wouxun. After quite a hiatus to update the Amateur Extra Class videos, I’m back to the Ask Dave series. These are also cheap to make and was passed on to me from another ham and i thought I would pass. Don't be fool by claims of dual band performance. YOURSELF ! Note: I don’t know the originator of this clever adaptation so I cannot provide any acknowledgement. Small, Portable, Lightweight and VERY VERY effective. >> > Which antenna is better: 5/8 wavelength vertical or a J pole? >> >> Better for what? For example, a 5/8 whip would usually be better than a J > >Owen, I think the popularity of VHF mobile 5/8 antenna lies in it has >more gain than a 1/4 wl antenna and is easier to match to 50 ohms than >a. I used a dual band hand held radio as a signal source and a Kenwood VHF/UHF power and SWR meter as a tuning indicator. brew antenna emerged from three factors: 1) my dual band antenna did not perform well with my new quad band radio (Yaesu FT-8900R); 2) I heard other hams on the air describing their homebrew projects and felt a j-pole was within reach for me; and 3) I figured that by studying the theory/ details of antenna construction my skill as. July 3, 2015 Antennas, Ham Radio, Test Equipment antenna, Baofeng, dbj-1, dbj-1 review, dbj1, ham, ham radio, HT, j-pole, jpole, review Michael This is a very limited test and review of the DJB-1 dual band HAM antenna that I purchased from Dr. I use the MFJ vhf antenna analyzer and a frequency counter then afterwards test with a radio and in-line swr/power meter. J pole antenna DBJ-1- a VHF-UHF Dual-Band J-Pole antenna, pdf file: J pole antenna building A 2-meter J-Pole antenna: J pole antenna a javascript for calculating the lengths of tubing to be used for the construction of a Super J-Pole antenna: J-pole antenna: J-pole antenna: J-pole antenna a number of antenna designs. tion Of an end-fed J-polc mounted at top Of a is not distorted. Trailed behind the airship, it consisted of a single element, one half wavelength long radiator with a quarter wave parallel feedline tuning stub. I have had this antenna on my roof since 1992 and it has been problem-free in the San Francisco fog. I bought the Arrow dual band j pole in hopes that I'd be able to get on VHF/UHF from an HOA perspective. Check out the video to see a general overview of the antenna. Goal is to design a dual band J-pole but without the loss ; DBJ-2 dual band roll up antenna - available in HAM (144-148 MHz and 440-450 MHz) or Commercial (152. The Buddipole™ - HFportable dipole antenna system, Welcome to the home of the Buddipole™, an hf/vhf portable dipole antenna system which is designed to be modular, versatile, and efficient. because it is based on Review of many people, the product is easy to use, high quality material. 6:1 or less VSWR and 420 to 450 Mc. It works for 2m and 70cm. 5 out of 5 by 14. The antenna is complete with exception of the 7 ft PVC ¾ inch pipe which can be purchased from any hardware store. This antenna was featured in the Feb. It has excellent DX properties and will out- perform many theoretically better antenna systems. To construct the antenna, first select a suitable length of grey 25mm conduit (as a minimum 1m but if you make it longer, you will have more room below the coil to attach to your antenna support). This Wi-Ex zBoost Dual-Band Directional Outdoor Signal Antenna (YX039) is the perfect accessory to the YX545 and YX540 dual band amplifiers in areas with a weak outdoor signal. 2/70CM “J” PORTABLE ANTENNA Plus a novel base support by N6JSX. diy collinear. Radio Shack # 21-961 3/8"-24/SO239 Mount (Mobile CB Antenna). This antenna is also known as the “copper cactus” (because it kind of looks like one of course!). TWIN-LEAD J-POLE VHF ANTENNA This is a design from an article by W9VZR in 73 Magazine ©, August 1977, P. You must know how to build anything from a J-pole for VHF to a beam for HF, and to erect and tune them without an antenna tunner and make them work the first time.