Mfj Ocf Dipole

A summary of dipole antenna system for high frequency radio. A real, all band OCF vertical dipole antenna. Simple Dipole Kits The following simple wire dipoles can be ordered in ready-to-ship kits for specified frequencies, or in a custom length cut to your specifications. Comparing 20m dipole and magnetic loop Did an interesting test today to compare the performance of my 20m multiband dipole and my MFJ magnetic loop. I just installed a Off Center Fed dipole where one leg is 45 feet in length and the other is 90 feet long. they do work but mfj another issue. Last year on Field Day I was able to use an OCF dipole, and enjoyed the quick bandswitching it allowed, so I thought I'd try and find a good OCF dipole and give one an extended try. The slight mismatch when using 50Ω coax can be easily matched with an antenna tuner. Our Greyline Performance upgrades to the DX Flagpole Antenna involve minimizing losses, finding every. What a superb piece of gear for anyone operating HF bands. Information, reviews and projects relating to Amateur Radio and associated interests DC to Daylight. all with no problem. An antenna tuner with a built in balun matches the feed-line impedance to the 50-Ω coax to your radio. Pull-tested to 200 pounds. Vine Antenna RS-HF-OCF-20 Off Centre Fed HF Di-Pole LAMCO £ 109. It's also ideal for those who want a high performance antenna with world class DX coverage. Vibroplex© W6LVP Loops Wellbrook Communications ZeroFive Antennas. Engineered from the ground up, innovative new antennas by K1BQT break traditional OCFD design barriers to deliver wider bandwidth, lower SWR, solid gain, and full-frequency. 20 Metre Delta loop antenna vs 20 Metre Dipole for noise level posted by cordoeia. They are designed to work below one wavelength in height. Just a short comparison on my FT-950 Yaesu using a OCF dipole on antenna port 1 and a Delta loop antenna on antenna port 2, switching back and forth to show the difference in received signal strength and readability. Engineered for maximum performance with a 14 Gage wire to our coaxial mono band double bazookas of RG11. This is an antenna that works without a tuner over the entire bandwidth of the 80, 40, 30, 20, 15 and 10m-band, simply by adjusting the output-tank of your tube power. Today I installed a Maxcom (fairly generic) OCF dipole for 80-6 meters. Ham Radio Antennas - Magnetic Loop experiments, ob New 160 Meter Antenna. Hi there, I have the same problem with my tuner and sending it all the way to MFJ from South Africa is going to be a real chore. Comes with holster and 6. Additionally, I have used the 259B to trim the VHF antennas on my vehicles. To see what the results with a real antenna would be, a 100 foot long dipole, 40 feet in the air, was analyzed using EZNEC (to find its input impedance) and TLA (to find the transmission line losses and voltages). Of course the main fundamental frequency lobe splits at higher frequencies. Unfollow 40 meter dipole antenna to stop getting updates on your eBay feed. The interesting thing is that it is multi banded with no traps. What others are saying This is the LDG and the DXV non-flag vertical dipole HF Radio Antenna for A LDG remote tuner and an all band, low loss, high-performance radio antenna that gets you on the air with DX Confidence. I would not run it more than 500 Watts, but that is because I am very conservative. Selling a brand new 135-foot OCF dipole made with 18awg "stealth" wire and Balun Designs 4110 300-watt Balun. The larger the wire, the wider the bandwidth. I have this situation. , & OCF Dipole Antenna Tired of looking at all of the parts, trying to figure out what works together? We've been there at one point, so we figured we would make it easier for you!. a doublet is a g5rv that's running all ladder line. Since MFJ-259B firmware has several versions under the same model number, you may find some final performance or function verification steps invalid. Connected to the same feedpoint is the 20. They offered no solutions. Both are in the attic of my very small detached house, the dipole is in the apex at a height of about 8m above ground. Hams with wide-range external tuners, like the MFJ-949E, can use a fixed 90 foot length of ladder-line. We have used an antenna electrically equivalent to this for over 7 years with outstanding results. Compact Multi-band Field Day Antenna. Length - The options range from 6 to 150 feet of antenna wiring. But wait, a choke is needed?! That wasn't mentioned on the website at all. FD4 HF Dipole Antenna 80m 40m 20m 10m windom ocf wire balun unun multiband. antenna 80M Field Day UHF homebrew dipole SSB 70cm 440 repeater buildup ARRL repeater Vanity Callsign Contest OCF 440mHz diy AO-51 DX Arduino SB-200. How do we get back the 160 meter resonance? By placing a series. My MFJ-993 autotuner uses an internal current balun (2-core) and tunes a ladder-line fed dipole to any frequency from 1. OCF Dipole for portable use Ham Radio Forum OCF Dipole for portable use - Forums Forums - Off Topic Forum FUN Forums Forums - Off Topic Forum FUN > Off Topic Forums > Ham Radio Forum. In this video I'm going to compare my 3 antennas using the SDRPlay RSP1 SDR with SDR Console software in my basement boiler room. Windom OCF Dipole Antron 99 (11 Meters) Jetstream JTB-1 Dual Band 2 Meter / 70cm Base antenna SCANNER RADIOS:. The picture above on the left shows the classical Dipole, which is usually fed with 50 Ohm coax, through a 1:1 balun. Greyline Performance offers an HOA DX Flagpole Antenna plus MFJ 998 RT Remote Antenna Tuner. The table below tabulates the results. 20' DX Vertical Antenna, OCF, No Radials + LDG RT-100 ATU for 80-6M. OCF Dipole And Ground Plane Antennas On A Push-Up Mast See more. Data tables, OCF and tuning methods, graphics and discussion of the results from 4NEC2 modeling of elevated vertical dipoles with 1,2,3,4,6 or 8-radials. Probably a good thing. The formula above is for a solid disc, an 8 spoke disc is a good approximation. The text below actually applies to any short dipole. I use a fan at home due to the issues with OCF dipole mentioned by /u/HecqRoth. long fed with about 25 ft. Have made 22m total length trapped dipoles for 80,40,20,15,10 and intended to do similar (trapped dipole) for (60,)30,17,12,6 but never got around to it. Currently running a 40m Double Bazooka and a 40/20/15/10 Shortened Dipole - getting decent performance from both. Dipole Antennas - Performance, Quality, Service. (NOTE: I'm the guy who tries to fix his plumbing, spends $300 to do it, and pays the plumber $200 3 weeks later). Here is a spreadsheet I designed in Microsoft Excel for calculating the first cut and the final cut (after testing) of a 1/2 wave dipole, whether center-fed, classic off-center-fed, Windom, or New Carolina Windom. Categories. net) This article describes a simple, portable 40-10 meter resonant portable dipole that will handle a 100-watt transceiver. The RadioWavz DX (OCF) Windom is ideal for those of you who do not use a tower and. I would have liked to have it be good to 2 KW at 100% duty cycle, but alas, it is not. dipole is cut to a specific length; a doublet is not. all with no problem. MFJ Versa Tuner (MFJ-941E) II MFJ Versa Tuner (MFJ-948) II MFJ Versa Tuner (MFJ-949C) II x2 TYT TH-9800 Quad band RCI-2990 10 Meter base AMATEUR ANTENNAS: End-Feed Dipole (Sloper) Antron 99 ( 17, 12 Meters w/ Tuner) Cali. 5 dBi peak gain on higher bands. Permanent antennas are a G5RV, an MFJ 40M and up OCF Dipole and a homemade endfed dipole using a homebrew linear wire-wound or toroid wound 9:1 unun. MFJ-2010 Off Center Fed Dipoles. This is the robust high-power version of the MFJ-2010 with 14-gauge stranded copper wire and porcelain end insulators. Firearm Discussion and Resources from AR-15, AK-47, Handguns and more! Buy, Sell, and Trade your Firearms and Gear. My Maxcon 3K80 OCF Dipole came a few days ago. It is a heavy duty QRP/Low Power antenna that uses #14 wire instead of the usual #16 wire used by our other QRP/Low power models. Shop our big selection of 10 Meter Antenna purchasable on-line. The text below actually applies to any short dipole. Length - The options range from 6 to 150 feet of antenna wiring. This is a simple dipole built for two-band operation that I made for portable use with my 20 and 40 meter QRP rigs. The dipole is constructed using top quality, Poly-STEALTH 13 Breaking strength 370 lbs. ) Manufacturer's Website. 95 from Ham Radio. These antennas deliver world-class performance by using the whole antenna element on every band. ) To be resonant, a dipole must be elec- trically a half wavelength long at the oper-. The RadioWavz DX (OCF) Windom is a off center fed (OCF) dipole antenna that exhibits outstanding performance on multiple bands typically with out a tuner. But when i purchased the Line Isolator and installed it below my Windom antenna, all the RF was gone from the shack. See more ideas about Ham radio antenna, Ham radio and Dipole antenna. The full wave hor­i­zon­tal loop WILL give bet­ter band width than a dipole. The antenna in question was an Off Center Fed (also known as OCF) dipole and they claimed their version was tuneable from 40 to 10 meters with the exception of 15 meters. This will not be a technical review, as there are many of those around, and the amp is based on the older designed ALS-1300, with some protection added. MFJ Versa Tuner (MFJ-941E) II MFJ Versa Tuner (MFJ-948) II MFJ Versa Tuner (MFJ-949C) II x2 TYT TH-9800 Quad band RCI-2990 10 Meter base AMATEUR ANTENNAS: End-Feed Dipole (Sloper) Antron 99 ( 17, 12 Meters w/ Tuner) Cali. This is an End-Fed Half-Wave (EFHW*) antenna for 80/40/30/20/17/15/12 and 10m bands. Or, get a bunch of points at home by putting up crown molding with an antenna wire running behind it. From the 7. Stealth Flagpole Antenna and DX Vertical Antennas for Ham Radio, at home or HOA. Shop Wire Antennas and Parts and get Free Standard Shipping on orders over $99 at DX Engineering! MFJ-2012 Power-Lite OCF Dipole Antennas work DX stations with. Current Balun - OCF Dipole - RadioBanter. A standard 40 meter dipole should be better on 15 because the coaxial stubs prevent the dipole from operating naturally on the 2nd harmonic. The RadioWavz DX (OCF) Windom is a off center fed (OCF) dipole antenna that exhibits outstanding performance on all bands. antenna 80M Field Day UHF homebrew dipole SSB 70cm 440 repeater buildup ARRL repeater Vanity Callsign Contest OCF 440mHz diy AO-51 DX Arduino SB-200. Steel whip on car 96 " or just a 40m ham stick. Then I finally started getting some real information. All-Band Doublet L. * QST 2015 - 2019 ARTICLES * First Issue of QST, December 1915 September 2015, pages 56-57 * * September 2019 100/50/25 QST Sep Issue for: 1919, 1969, & 1994 W1AB 100 ANTENNA: A Slightly Off-Center Fed Dipole, K1LI/J75Y 30-32 ANTENNA: A Compact, 2-Meter Base Station Antenna for Rugged Use W6NBC 37-39 ARES: 2019 Simulated Emergency Test WV1X 71-71 ARES: Building an ARES Program in an Age of. Here is a spreadsheet I designed in Microsoft Excel for calculating the first cut and the final cut (after testing) of a 1/2 wave dipole, whether center-fed, classic off-center-fed, Windom, or New Carolina Windom. They offered no solutions. MFJ-2982 Feather-Lite 80-6 Meter Vertical Antenna Static. I have also used it to set up the traps on my Hy-Gain TH-3JR. 67 feet long at 60 meters), the T2FD provides signal gain, wide frequency coverage, and exceptionally low noise characteristics. Off-Centre Fed Dipole (OCFD) for 80, 40, 20, 10 Been experimenting with simple wire antennas and I've just built an Off Centre Fed dipole (OCFD) as described here It looks like this: I don't have 27m of free space so that leg goes up to a tree and then hangs down in an inverted L arrangement. essentially an off-center fed dipole (OCFD) that uses a portion of its feed line as a vertical radiator. We offer a huge variety at great prices. telescopic fiberglass vertical antennas that set up in minutes, collapse to only 3. MFJ-2010 Off Center Fed Dipoles. Shop Wire Antennas and Parts and get Free Standard Shipping on orders over $99 at DX Engineering! MFJ-2012 Power-Lite OCF Dipole Antennas work DX stations with. 95 Out of Stock : EF80 : RADIO WAVZ EF80: 80M 1/2 WAVE END FED ZEP $75. I am a little nervous about my known reliability of the MFJ 927 unit, and I don’t have enough operating experience with the SGC 239 yet. The center of the antenna should not be higher than λ/4. One of the greatest features of this tuner, compared to an autotuner like the LDG YT-100, is the ability of use it with ANY HF radio. 95 * Buy It. Do not use a single-core current balun (by itself) under any circumstances. MFJ MFJ-2014 3. The crowded space above the set required a compact multi-band dipole, and the CHV-5X was selected to solve the problem the minimal space presented. This improves performance on 40, 30 and 20 meters and to some extent on 17 and 15 meters. I did use my Antenna Analyzer for the preceding experiments, not my radio transmitter!!. Model 4114ocf - 4:1 Balun 1. They are designed to work below one wavelength in height. I have used it to test two dipoles I use at home as well as a deployable twin-dipole I built for ECOM. The crowded space above the set required a compact multi-band dipole, and the CHV-5X was selected to solve the problem the minimal space presented. The W2AU balun also is good for 2 KW PEP, or 1000 at 100% duty cycle. It must be totally removed from the feedline. Best bet would be a 135 foot dipole fed with open wire or ladder line to a balun near your shack with a short coax jumper to the tuner. No Radials needed from 80-6M. On the box side of the dipole arm the wire is tipped with an eye for a M4 screw (made by ZES Dolny Kubin, Slovakia). A little bit of help from my MFJ-948 is required on 17m+10m. 2 on 20m; 1:1. Off-Center Fed Dipole (OCFD) This antenna is cut for 80, 40, 20, and 10 meters. 95 * Buy It. MFJ Wip 17ft; MFJ-5904 RF Design box; MFJ air wound coil for the telescopic 17ft wip; On portable vertical; On radials; Modifying hamstick for 500W (**Note: the coil is here) 40-10m Twinlead fishing rod vertical; Aerial 1/2 wave vertical end-fed vs proper dipole; Instructions for EFHWA; EFHW, detailed discussion. Ham Radio's Premium DX Vertical Antenna plus MFJ 998RT Remote Antenna Tuner. It has the supplier's 4:1 balun. These antennas deliver world-class performance by using the whole antenna element on every band. The 450 ohm balanced transmission line serves as a 1:1 transmission line transformer on 14 MHz. Don’t worry about the total length of the antenna. Specifically engineered for operation on the 40, 20, 10, and 6 meter bands, these antennas deliver world-class performance by using the whole antenna element on every band. Orange Box Ceo 7,276,612 views. Technical resource and information on receiving and transmitting antennas, amplifiers, radios, baluns, for 160 meters 80 meters and other low bands. Needs a 4:1 balun. Finally got my OCF Dipole antenna up this afternoon and managed not to drop anything on my head. The RadioWavz DX (OCF) Windom is ideal for those of you who do not use a tower and beam. The full wave hor­i­zon­tal loop WILL give bet­ter band width than a dipole. I use a OCF while camping since a fan dipole in a bag turns into a crazy mess of wires and it's no fun spending most of an afternoon to untangle the 8 long wires that have turned into mess. Dual-Banding your 40m vertical for 15m. 95 Ex VAT £ 108. A different approach to the dipole theme is the W3DZZ - type of trap dipole, originally developed from a series of practical trials to obtain an antenna for multiple amateur frequencies, to be fed with high impedance transmission line and be used in connection with tube-type transmitters with a higher termination impedance than contemporary. Construct a multi-band off-center-fed (OCF) dipole covering the 40, 20, 15, and 10 meters amateur radio bands, and possibly the 6 meter band (but that is considered a bonus band, outside the main project objective. MFJ MFJ-2016 1. • Capco and MFJ magnetic loops mounted in the loft and outdoors at a height of four metres – the multi-band dipole was consistently either equal or 1 - 2 S-points better. This gain is 2. Following Red Line at the top, you see that the gains drops away more rapidly as the dipole is bent toward ground. I now live at a new QTH, my kids have left home and all of the tv's and other electronics in the house have been replaced over the last 5 years apart from the microwave but the problem remains s5-s7 static noise on 40-17m 12 & 10 are clear with only one common factor my OCF. Troubleshooting a Buckmaster OCF Dipole is much like troubleshooting a standard dipole antenna. See more ideas about Ham radio antenna, Ham radio and Dipole antenna. Coaxial Traps for an 80/40/30m Dipole Back. You can hardly see this mini 14 foot rotatable dipole across the street! Its tiny 7-foot turning radius fits on the smallest roof -- it’s perfect for town houses, apartments and condos. I only have 100 watts and using this antenna I can break pileups on 80, 40 and 20 meters. Ideal for use when constructing antennas such as on Off Centre Fed Dipole, Windom or folded dipole. 300 Ohm Twin Lead with the ends shorted is an option for even greater bandwidth. When I first strung up my Buckmaster 7-band OCF dipole, I borrowed the RigExpert AA-30 from Greg W1TEN, in order to measure the VSWR , since I wasn’t thrilled about spending $200 for the analyzer. I originally uploaded this video. "Balun Selection" is 'the' most critical success factor of the OCFD. The MFJ-2013 is a one-half wave dipole ERP on 60 meters plus up to. Multi-Band Horizontal "dipole" Antennas. Discover ideas about Ham Radio Antenna W6SAI OCF Dipole 40-6 meters. 6) Both units were extensively bench tested into a dummy load and a reactive OCF dipole antenna, with the unit mounted at the shack position. net) This article describes a simple, portable 40-10 meter resonant portable dipole that will handle a 100-watt transceiver. I am using MFJ hamsticks for 20m and 40m bands in dipole configuration(s), i. Post #1340 Ham Radio - Salvaging a burned MFJ 962D versa tune. Both are in the attic of my very small detached house, the dipole is in the apex at a height of about 8m above ground. look 10 Meter Antenna now! purchase 10 Meter Antenna from Ebay. My last portable antenna was two hamsticks in a dipole configuration (here is a great general overview article about hamstick dipoles, from my buddy over at Prepared Ham). The OCF Flagpole really holds its own and is a stealth antenna, too! Look at the low-band (40/80M) results versus the 43′ vertical with radials. as a vertical with counterpoise results under testing but at 10 feet resonance is 13. I am a little nervous about my known reliability of the MFJ 927 unit, and I don’t have enough operating experience with the SGC 239 yet. Data tables, OCF and tuning methods, graphics and discussion of the results from 4NEC2 modeling of elevated vertical dipoles with 1,2,3,4,6 or 8-radials. Ferrite Products for RF Chokes, Baluns, and RFI Mitigation. 362 results for antenna balun Save antenna balun to get e-mail alerts and updates on your eBay Feed. Unlike Windom and OCF Dipoles, the ZS6BKW / G5RV is a very forgiving antenna when it comes to nearby towers, trees, fences and other structures. Orange Box Ceo 7,276,612 views. At least 50 beads are needed to provide an acceptable level of choking impedance. Categories. The SWR is less than 1. The ½-wave dipole, even quite near the body (which you can use as a reflector if needed), works so much better than the H-T’s duck - there’s just no comparison. It was built to take along camping so I would only have to take & put up one antenna instead of two. Open wire line has a very large advan-tage. We rate the Wattage on our antennas at exactly what we think they will do, so a 300 Watt antenna really will support about 300 Watts. (dipole), based on 95% of electrical wavelength, considering end effects. Sort the list by. Dipole antennas plans is a curation of 156 resources about , Trapped Dipole Antenna for 20-30-40m, The Galaxy dipole, Feed line Dipole for 2 Meters, All Band Dipole, Practical Dipole Antenna. It has the supplier's 4:1 balun. The antenna is placed in the shape of an inverted V, with its two transmission lines or legs bent towards the ground making 120° or 90° angle between them. End Fed Half Wave Antenna -11 Bands One Antenna! Ham Radio 2m Backpack Quad Antenna. An Off-Center-Fed (OCF) dipole with total span of 84+17=101 ft, with the feed point at 1/6th of the total span (101 / 6 ≈ 17 ft = 17%) from one end ( = 83 / 17 OCF). Grounding is key to good reception by John Doty (as published on rec. The center of the dipole is 6-7 feet vertical from ground level. The SWR is less than 1. From all that I read on the OCF Dipole, the height determines the type of balun required. 18 SPC QRP Kits and Parts Available from Oak Hills Research, Mike Czuhajewski, WA8MCQ, April 91, p. In a multi-band dipole system, the antenna almost never presents a moderate impedance load to the balun over the full frequency operating range. MFJ MFJ-2010 7 / 14 / 28 / 50 MHz Off Center Feed OCF Ultra Light Dipole - with Balun - 300 Watts - SO-239. Advanced Search. Buy Hf Dipole now. Of course you can get lucky and make as high as 75% efficiency with a sweet length of feed line. Dipole Easy and cheap to build, can be made with small gauge wire •MFJ-926B. Page update of 7 August 2019 Over several decades, Barry Booth (W9UCW) and a group of fellow hams, have done an incredible amount of well-documented and systematic, repeated tests to assess the performance of various. It has the supplier's 4:1 balun. 95 Special Order : DX80MSH : RADIO WAVZ DX80MSH: 80M SH DX(OCF) WINDOM 77FT $107. MFJ MFJ-2016 1. First of all what is noticeable is the noise floor level which is lower than I got with other antennas such as G5RV, long Wire, dipole, Conrad Windom etc…. mfj is now the only authorized north american sales and service distributor for xiegu products! MFJ is the exclusive North American … DA: 72 PA: 28 MOZ Rank: 19. The following PDF files maybe of interest to you then, these are some of the better performing Multi-Band HF antennas they been around for years. (try 160M with this package!) Smart, Strong, Elegant. rfi, Radio Frequency Interference. i built a 132 ft long ocfd with coils positioned in certain places on the elements. We have tested the new FPA-20F-OCF with a LDG AT-200ProII autotuner (rated for 6 to 1,000 Ohm loads) at the end of 40 feet of coax to simulate a typical installation and also with an MFJ-998RT outdoor rated tuner (rated for 12 to 1600 Ohm loads) placed near the antenna. It can be constructed a variety of ways, but Figure 2B shows the technique I used to build my first antenna. HRO Discount Price: $109. MFJ Wire Antenna, 160m-10m, G5RV dipole and Ham Guides TM Pocket Reference Card Bundle. Sort the list by. I contacted MFJ and confirm that what I was noticing was a failure of their "matching network" AKA balun. mfj 2010 off center fed dipole specs. Dipole Antenna Calculator. 12' DX Vertical Antenna, No Radials, OCF vertical dipole for 80-6M. Vertical or dipole? Which is better for you? Antenna modeling software (EZNEC+) helps answer the question!. 5 dBi peak gain on higher bands. net is a Web site dedicated to ham radio (amateur radio). A real, all band OCF vertical dipole antenna. See (hear) you in the next WES, SKS, or NAQCC sprint. Unlike many END FED antennas on the market, this one does not require the Antenna Tuner to operate. db we can out of the antenna heights we offer and enhancing take-off angles too. MFJ Ultra-Lite Off-Center Fed Dipole Antennas are for 40, 20, 10, and 6 meters and handle 300 watts PEP SSB/CW. Those filters would have really been nice tonight. Dipole antennas with 1:1 balun, are the simplest practical antennas from a theoretical point of view; the current amplitude on such an antenna decreases uniformly from maximum at the center to zero at the ends. 6) Both units were extensively bench tested into a dummy load and a reactive OCF dipole antenna, with the unit mounted at the shack position. The Wire Size can range from 16 AWG to 12 AWG. 1/4 Wave Ground Plane Antenna Calculator. In the drawing above, it is shown for just four bands, 80 thru 10. Shop our wide selection of 1 1 balun for sale online. 05 wavelengths (7 feet) to 4 wavelengths (560 feet) above good ground. Engineered from the ground up, innovative new antennas by K1BQT break traditional OCFD design barriers to deliver wider bandwidth, lower SWR, solid gain, and full-frequency agility without a tuner!. An antenna matchbox is a device used in the antenna line for the purpose of matching two different impedances to each other. It works surprisingly well for the center only being 17 feet high. This is a discussion of the modeling results for a standard vertical monopole with 1,2,3,4,6 or 8 elevated radials. BUCKMASTER DX-OCF-HP40 or MFJ-1799 Vertical. You can hardly see this mini 14 foot rotatable dipole across the street! Its tiny 7-foot turning radius fits on the smallest roof -- it’s perfect for town houses, apartments and condos. Apparently, OCF dipole designs had so far been a compromise between these three bands. The Wire Size can range from 16 AWG to 12 AWG. 75 dBi at 45° and it extends almost in a semi-circle around the side arm. Rated for 2KW PEP. of wire loops, long wires, and OCF dipoles up for multiband operation. Think of the "Carolina" windom antenna (the modern version of the windom) as an "upside down vertical antenna", hanging down from its counterpoise strung (more or less horizontally) some 10 meters (or more) above ground. 5 - 54 MHz for OCF Dipole - 5kW. G5RV 10-80 Meter dipole in an inverted V fashion, 30 feet at the peak. An off-center fed (OCF) dipole antenna which covers the 80 through 6 meter Amateur Radio bands can be made with locally bought materials and readily available baluns from a variety of Amateur Radio sales outlets. The text below actually applies to any short dipole. In this two part video from "Survivalist2008", we learn the basic theory, design, and construction of this unusual dipole antenna. ANTENNE VHF ed UHF 2 m quad 70 cm turnstile 70 cm ground plane The most simple dual band antenna 145 431 MHz Dual band antenna - Pattern study. This could be 50 ohm types such as RG58, RG8X, RG8, RG213, or 75 ohm type such as RG11, RG59, RG6 or even 75 ohm twin lead. of wire loops, long wires, and OCF dipoles up for multiband operation. Welcome to the home of EFHW - End Fed Half Wave antennas, BALUNs, UNUNs, OCF, and Accessories. com Skip to main content OCF Dipole 7 Band 80-6 Meters Antenna Poly-Stealth 61 core. MFJ Power-Lite OCF Dipole Antennas work DX stations with ease because the Power-Lite Off-Center Fed antennas are engineered to launch a powerful, globe-spanning signal. It is at a height of 40' and performs very nicely. Virtually all ham radio operators use the same antenna for both receiving and transmitting on a given amateur radio band. 40-10 Meter Portable Dipole Phil Salas – AD5X ([email protected] Well I wasn't expecting much but after doing the analysis, I am convinced it's not so bad as I thought. mfj stick dipole vhf coaxial dipole antennas w3dzz trap dipole 20 meter rotable dipole dipole uhf dipole moment of benzene 1 dbi dipole pattern micro dipole warc band dipole dipole vs direct reviews making your own ham dipole b w ds6 dipole review short vertical dipole all band rotary dipole dipole subwoofer dipole gravitational 40-10 trap dipole. Of course the main fundamental frequency lobe splits at higher frequencies. The analyzer arrives tomorrow to finalize tuning but so far I have enjoyed all good contacts from eastern USA, Canada, Saint Croix and Italy. They are designed to work below one wavelength in height. Rv Radio Ham Radio Antenna Wifi Antenna Rv Wifi Ham Radio Equipment Camping Equipment Outdoor Antenna. It's also ideal for those who want a high performance antenna with world class DX coverage. MFJ Enterprises My Antennas New-Tronics NI4L Custom Dipole Norm's Rotors PAR Electronics Princeton Antennas Radio Works Spiderbeam Steppir TAK-tenna Tarheal Antennas Tennadyne T. Calibrating the MFJ-259B Antenna Analyzer. 5 kW automatic tuner. At 33’, the feed point impedance would be 200 ohms, requiring a 4:1 balun. The RadioWavz DX (OCF) Windom is ideal for those of you who do not use a tower and beam. Having looked over his antenna I decided on the 7 band version, as that would cover most of my needs while in the field. 63 Add to basket; Vine Antenna RS-HF-OCF-40 Off Centre Fed HF Di-Pole LAMCO £ 119. Looking for Hf Balun, we have Hf Balun at affordable prices, check them out and buy Hf Balun now. No Radials needed from 80-6M. Disc Sanders For Sale Ac Band Saw, Bench Sander, Air Sander, Disk Sander, Belt Sander, Belt Disc Sander, Wood Lathe, Delta Rockwell, Powermatic, oscillating sanders. This calibration procedure is the correct procedure for later MFJ-259B's. I now live at a new QTH, my kids have left home and all of the tv's and other electronics in the house have been replaced over the last 5 years apart from the microwave but the problem remains s5-s7 static noise on 40-17m 12 & 10 are clear with only one common factor my OCF. By the use of antenna modeling software (Reference 10), this article is to expand our general knowledge relative to angle-of-bend and off-center-feed (OCF) configurations of the L-Antenna. I have used a 270’ Buckmaster 9 band OCF dipole for years and an ongoing A/B comparison shows the R-9 equaling or surpassing the Buckmaster on 40M and 20M. It is typically used for matching a transmitter (or transceiver) whose impedance is 50 Ohms, to an antenna system (antenna plus transmission line) whose impedance is not 50 Ohms. Made to last. 57 inch), wall - 0. EFHW-8010-1K Multi-Band End Fed Half Wave Antenna. I have a FLEX-6500 (100 Watts) with built-in antenna tuner running barefoot. I have an Alpha-Delta DX-LB Plus; a loaded 160/80 Meter dipole with 40 Meter dipole and 20/10 Meter fan dipoles underneath. Option 5: Off-centre fed dipole (OCF). You might have considered industry place and pay attention to a variety of companies and Communication Radio Supplies and are a lot more puzzled than once you began. 18 SPC QRP Kits and Parts Available from Oak Hills Research, Mike Czuhajewski, WA8MCQ, April 91, p. Q:My antenna operates well but I am getting RF on the feedline, what can be done? First thing, make sure your feedline is not parallel to the legs of the antenna. A summary of dipole antenna system for high frequency radio. I have been connecting the antenna to an SGC-tuner (SG-231) for use with a K-2/100. Not much to write home about. DIY 40m Band 1/2 Wave Dipole Antenna - DIY 40m Band ( 7. 95 * Buy It. 32 dBi gain of the standard horizontal dipole at the 90° mark, the V-dipole gain drops to around 6 dBi at the 45° mark and 5 dBi at the 15° mark. In a multi-band dipole system, the antenna almost never presents a moderate impedance load to the balun over the full frequency operating range. I have used a 270' Buckmaster 9 band OCF dipole for years and an ongoing A/B comparison shows the R-9 equaling or surpassing the Buckmaster on 40M and 20M. Ham Radio - D loop directional half loop transmit WB3GCK's Field Day Antenna Inverted L (80M-10M). The RadioWavz DX (OCF) Windom is a off center fed (OCF) dipole antenna that exhibits outstanding performance on multiple bands typically with out a tuner. It can test the SWR position of your antenna, measure the blockage and reactance part and assist you to crack antenna problems. MFJ Power-Lite OCF Dipole Antennas work DX stations with ease because the Power-Lite Off-Center Fed antennas are engineered to launch a powerful, globe-spanning signal. Below is a quarter wave ground plane antenna I made for 23cm, 1296MHz which is made from off-cuts of household mains copper wire and a scrap BNC socket from the junk box. Vine Antenna RS-HF-OCF-20 Off Centre Fed HF Di-Pole LAMCO £ 109. The Off-Center-Fed-Dipole - also called a "Windom" by many companies selling them - has a somewhat blemished reputation amongst amateur radio operators. The antenna is designed to be fed with 50 or 75 Ohm Coax Cable of most any length with a Balun. Hams with wide-range external tuners, like the MFJ-949E, can use a fixed 90 foot length of ladder-line. My last portable antenna was two hamsticks in a dipole configuration (here is a great general overview article about hamstick dipoles, from my buddy over at Prepared Ham). The SWR plot for an 80 meter broadband dipole is shown below. The Mast Company Titanex Ultimax Antennas US Tower Corp. Dipole Easy and cheap to build, can be made with small gauge wire •MFJ-926B. This could be 50 ohm types such as RG58, RG8X, RG8, RG213, or 75 ohm type such as RG11, RG59, RG6 or even 75 ohm twin lead. One may argue that 560 feet is ridiculous for a 40 meter dipole, but keep in mind that the data can be scaled down to a 10 meter dipole with similar results. NI4L Dipole assemblies are single band center fed dipoles containing top quality parts. This is a Custom Built version of the CAROLINA WINDOM® 40. Important Note: As with all models of the G5RV antenna, the Optimized version also requires a minimum of 70 feet of 50-52 ohm coax to complete the matching network. checked with a mfj 249 the ham bands except 15 mtrs were at less than 3. This is the length of a standard dipole but instead of dividing the result in half, use a 36/64% offset to determine the feedpoint. What others are saying This is the LDG and the DXV non-flag vertical dipole HF Radio Antenna for A LDG remote tuner and an all band, low loss, high-performance radio antenna that gets you on the air with DX Confidence. Looking to minimize SWR on a homebrew vertical dipole for 136-174 MHz and 400-490 MHz. I would not run it more than 500 Watts, but that is because I am very conservative. I installed an 18' vertical and on 20 meters it generally outperforms the dipole because the dipole is so low. HRO Discount Price: $89.