Mfj Ocf Dipole

The fan dipole, or multi-element dipole, is a good choice for the amateur who wants to have access to three, four, or even more HF bands with a single antenna. 362 results for antenna balun Save antenna balun to get e-mail alerts and updates on your eBay Feed. Here are some critical guidelines: Unless your OCFD will be at least 25m high (80 ft. New improved version now goes down to 100 KHz and up to 61 MHz < 2:1 SWR. But with a. Related Products Buckmaster 4 Band 3000 Watt OCF Dipole 40, 20, 10 & 6 Meter $298. Greyline Performance offers an HOA DX Flagpole Antenna plus MFJ 998 RT Remote Antenna Tuner. Communication Radio Supplies ensure it is an easy task to keep in touch when you find yourself trekking or hiking outside and construction personnel relies on a Communication Radio Supplies is very important in every part of your lifestyle. Super-strong injection-molded center insulator with built-in SO-239 connector and hang hole. Comparing 20m dipole and magnetic loop. Dipole antennas plans is a curation of 156 resources about , All Band Dipole, Practical Dipole Antenna, Inverted Vee monoband antenna, Center Connector for Dipole Antenna, Paper Clip Dipole Antenna. MFJ-1234 RigPi Station Server Remotely operate your Rig from anywhere in the World using a web browser, mobile phone, iPad, tablet, laptop, desktop or even a Kindle! Use nearly any transceiver with CAT control, old or new, no computer or computer knowledge needed. Halfwave Reflector is: 136. Cela faisait un moment que j’avais fait l’achat d’une antenne verticale Butternut HF2V bi bandes 40 et 80 mètres. Now covers 6 m at no extra cost. 87 feet 174. Simple'HF'Wire'Antenna' We'will'explore'typical' varia2ons'of'the'wire'dipole' high'frequency'(HF)'antenna' Typical'Amateur'Radio''' TransmiIng''Antenna'. 5% shorter than a dipole. The tuner that came with my HF radio has a built in 4:1 balun in it and connections on it for ladder line. Its planned use is generally within that band, although it may be useful on other bands (near odd-harmonics) where feedpoint impedance reasonably matches the coaxial feedline. On 17 the fan dipole was always better but not by as much. So pretty even the XYL's approve!. Random Wire Antenna Lengths. 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. What the MFJ-856 device is, is a wide band receiver in the 135 MHz. [email protected] MFJ-269CPro Like MFJ-269C, but has its UHF range coverage 430 to 520 MHz and an extended commercial-style cabinet for lab work (helps protect knobs and connectors from damage. 15 meters OCF dipole antenna mounted 40-ft/12. 95 MFJ 1886 Receive Loop. Cumbersome cage dipoles or load switching arrrangements deliver only partially satisfactory results that are easily outperformed by the OCF dipole [1]. A multi-band wire antenna that performs exceptionally well even though it confounds antenna modeling software Article by W5GI ( SK ) The design of the Mystery antenna was inspired by an article written by James E. we provide an enormous selection that you simply can love. Arrow OSJ144/440 Video Review. W2AU's operate at a low VSWR from 1. is almost certainly not 1:1. You won't. How to create a 3D Terrain with Google Maps and height maps in Photoshop - 3D Map Generator Terrain - Duration: 20:32. 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. The 4-Band antennas are OCF (off-center-fed), with a 23 foot leg and a 45 foot leg, totaling 68 feet. This is a re installation of a off center fed 10-80 meter radiowavz dipole that we flipped around 180 to allow the feedpoint to be higher with great results. 25' of coax wound in a 6" loop at the base of the balun. I have this situation. Cut 7 feet of ½″ CPVC. February 7 of 2010 was a quiet Sunday. No Radials needed from 80-6M. used common 1/3 feed point 19 ft of450 ladder line to 4 to 1 voltage balun with 10 ft of coax. 15 MHz ) 1/2 Wave Dipole Antenna. The picture on the right above shows an OCF Dipole with the feedpoint positioned at the same feedpint of the classical WINDOM antenna, fed with 50 Ohm coax through a 4:1 or 6:1 balun at a point 1/3 of the distance from one end. Antenna is installed on an homemade non conductive standoff about 4 feet from my tower, and balun is about up 25 feet above ground. Nashua Area Radio Society › Topics In All Forums › Elmering Forum › OCF Dipole Help This topic contains 12 replies, has 3 voices, and was last updated by Fred Kemmerer 1 year, 10 months ago. balun meters. 5 meters (~ 136 ft. Are you looking for a quick and convenient way to run a portable dipole without needing 2 or 3 supports or several antennas for portable or permanent operation?. 15 for Director Low Mount Halfwave is: 127. The well-known length formula is L (feet) = 468/Frequency (MHz). My Amateur Radio Station W4HH-- Antennas -- I have two antennas for the station -- and off-center-fed dipole for HF and a dual-band vertical for VHF-UHF. I was talking to a operator last night that sounded really awesome on a Yaesu FT101, it sounded like nothing I ever heard before. , MFJ Enterprises. 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. Dipole Cousins Inverted V – Only needs one support. I installed an 18' vertical and on 20 meters it generally outperforms the dipole because the dipole is so low. com This is the MFJ-1835 cobweb antenna, that covers 10,12,15,17 and 20 meters, similar to a fan dipole More like this Review of the MFJ-1835 Cobweb Antenna (#71). Get the apex as high as you can and keep the ends at least 10 feet above the ground for safety. The MFJ-2012 is a "no-compromise" OCFD design for 40, 20, 10, and 6 Meters that delivers. The very predictable pattern of a resonant dipole applies only to the lowest, or. Perfect for building a dipole. 73 Vaclav. Simple'HF'Wire'Antenna' We'will'explore'typical' varia2ons'of'the'wire'dipole' high'frequency'(HF)'antenna' Typical'Amateur'Radio''' TransmiIng''Antenna'. 90 feet one way and 45 feet the other. The balun project is a great introduction to what old timers. Windom – Similar to the OCFD. 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. 86 feet long. The half-wave ham radio dipole is also the most common antenna used by amateur radio operators throughout the world. If the feed point is distance x from one end of the half wave (lambda/2) dipole, the radiation resistance relative to the feed point will be given by the above equation. Suggested lengths for high impedance feedline on dipole type antennas Good lengths are green shaded area in the chart below. I plan to change my end fed dipole to center fed and as a result of this 67 dipole not being far enough off the ground i will need to run the ladder line horizontally away from the flat top dipole a few feet and then back in the direction of the house along a guy line. Après 29 ans de bons et loyaux services, l’U. The MFJ-939Y automatic antenna tuner is a perfect match for my Yaesu FT-450. Troubleshooting a Buckmaster OCF Dipole is much like troubleshooting a standard dipole antenna. Take any other information with a grain of salt. net is a Web site dedicated to ham radio (amateur radio). However, there should be some provision for antennas. Any Band • Any Mode • Any Time. The RadioWavz DX (OCF) Windom is a off center fed (OCF) dipole antenna that exhibits outstanding performance on all bands. I called Palomar Engineers and I happened to talked to you directly; regarding the on going issue with the MFJ antenna. 00 RadioWavz 80 METER DIPOLE 1:1 1500w SSB/PEP 200w CW (125' 8") $69. Ready built. 5:1 on 6, 10, 20, 40 & 80m bands and can be operated without an antenna tuner. Current Balun - OCF Dipole - RadioBanter. Related Products Buckmaster 4 Band 3000 Watt OCF Dipole 40, 20, 10 & 6 Meter $298. The OCF dipole radiation pattern goes from broadside on the fundamental frequency to slightly unidirectional axial at harmonics. Join us at 00:00 UTC on October 11 through 23:59 UTC on October 13 for the 100 Watts and a Wire: FALL OUT! If you have a portable station you can activate from anywhere. net is a Web site dedicated to ham radio (amateur radio). QRZ Forums - Antennas, Feedlines, Towers & Rotors for Tuesday 19 September 2017 Showing 1-1 of 1 messages. Nashua Area Radio Society › Topics In All Forums › Elmering Forum › OCF Dipole Help This topic contains 12 replies, has 3 voices, and was last updated by Fred Kemmerer 1 year, 10 months ago. We suspended the 4:1 current balun at about 35 feet (8 poles I think). MFJ MFJ-2014 3. 8 MHz, at just over a quarter wave length it will still give usable access to this band. The JK401 is a simple Hi-Q coil loaded rotatable dipole, with a small footprint as well giving great performance on 40M. Vibroplex© W6LVP Loops Wellbrook Communications ZeroFive Antennas. My first impression was so-so, but as I use it more and more, I am increasingly pleased with the performance. 95 MCR666 - 7 BAND COBWEB ANTENNA FROM 4 TO 20 METERS: 2 2. This video was uploaded from an Android phone. Interior components, include an extra heavy duty Roller inductor and capacitor with balun. EFHW-8010-1K Multi-Band End Fed Half Wave Antenna. Despite the modest station, I still have a lot of fun with CW, SSB, FM and a number of digital modes including PSK, RTTY, FT8 and Feld Hell. (NOTE: I'm the guy who tries to fix his plumbing, spends $300 to do it, and pays the plumber $200 3 weeks later). Pull-tested to 200 pounds. Cumbersome cage dipoles or load switching arrrangements deliver only partially satisfactory results that are easily outperformed by the OCF dipole [1]. MFJ MFJ1779A: SINGLE BAND DIPOLE 265ft. The RadioWavz DX (OCF) Windom is ideal for those of you who do not use a tower and beam. Calibrating the MFJ-259B Antenna Analyzer. I was talking to a operator last night that sounded really awesome on a Yaesu FT101, it sounded like nothing I ever heard before. Introducing the W8AMZ 80–6m OCF / Windom Multi-Band Antenna using a 4:1 Balun and rated for 2 KW. 61 one side. Finally got my OCF Dipole antenna up this afternoon and managed not to drop anything on my head. You have been given the obligation for buying Communication Radio Supplies. The VE2DPE 160 Special!. FLAT RATE SHIPPING MFJ: MFJ-1020C Indoor EF-SWL End-Fed Dipole Antenna 1-30 MHz:. 0 April 30 2018 Project Description Building center balun(s) / insulator similar to that of the multi-band B*****r commercial off-center fed dipole, for a small fraction of the cost of that commercial antenna. I am a bit short for 80 meters, so had to add coils to save about 4 feet each side, at first the 40 meter dipole hung 2 feet below the 80 but last time it was down I made it 1 foot. MFJ Remote Antenna Tuners MFJ 998RT (1500W Remote Tuner) OCF vertical dipole for 80-6M. I have horizontally isolated the dipole from its feedline by about 4 feet. Made to last. checked with a mfj 249 the ham bands except 15 mtrs were at less than 3. But this time was a fiasco. Inspired by the possibilities shown in the prior art of the asymmetrical hatted vertical dipole I decided to test the real thing. No Radial, vertical dipole design is Smarter, Stronger, more Elegant, and HOA approved. Super-strong injection-molded center insulator with built-in SO-239 connector and hang hole. The RadioWavz DX (OCF) Windom is ideal for those of you who do not use a tower and beam. Buckmaster 7-Band 300 Watt OCF Dipole Antenna (Click for larger image) Our 7-Band antennas cover 80, 40, 20, 17, 12, 10, and 6 meters , with no tuner required! Wire antennas are a great simple way to work 40M and 80M rather than a noisy vertical antenna that requires horizontal radials. The OCF topic got me to thinking, what is a Zepp? I may even have the wrong terminoligy, I'm speaking of the antenna fed with ladder or open line, and one end of the line is fed to the antenna, and the other just sets up there, lonely and tied to nothing. The OCF Dipole is a MUCH MUCH better multi-band antenna than the G5RV. I have a FLEX-6500 (100 Watts) with built-in antenna tuner running barefoot. 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!. 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. Answers like "I can work everything I hear", or "I have worked "X" amount of DX-stations in the first hour on the air" are nearly useless. Shop our wide selection of 1 1 balun for sale online. No Radials, stealth vertical dipoles, 160-6M. This antenna generally requires the use of a suitable matching network (antenna tuner) since the SWR of the G5RV JR. rfi, Radio Frequency Interference. I personally use an LDG Z-817. 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. This one does 40-20-10-6 meters. Night and day. Do not use a single-core current balun (by itself) under any circumstances. DIY 40m Band 1/2 Wave Dipole Antenna - DIY 40m Band ( 7. 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. Buy MFJ-17758 80/40 Meter Dipole: Fixed-mount CB Radios - Amazon. 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. 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. Each dipole kit contains a glass-filled Budwig HQ-1 centre insulator, two Budwig HQ-2 glass-filled end insulators, #14AWG insulated 168-strand copper wire, and 50 feet of solar. 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. This is the robust high-power version of the MFJ-2010 with 14-gauge stranded copper wire and porcelain end insulators. 80/40 Loaded Dipole (inverted V, center at 21 feet, ends at 5 feet) 80/40 Resonant End Fed (sloper, loaded end at 25 feet, feedpoint at 3 feet) Test Procedure. The concrete lanai of a condo is about as bad, technically, as it gets for limited space antennas. The RadioWavz DX (OCF) Windom is ideal for those of you who do not use a tower and beam. Buckmaster OCF Dipole Antennas Buckmaster's Best Coaxial Cables Antenna Support Rope Stringliner Reel with 270 feet of Twisted Nylon Line Harken Stainless Steel Pulleys Line-Grips RF Chokes CQ Magazine Archives Great Circle (Azimuthal Equidistant) Maps World Prefix and Worked All States (WAS) Maps HamCall Mousepads Custom Name Badges Amateur. I QSL 100% via Logbook of the World and eQSL. 300 Watts. I installed an 18' vertical and on 20 meters it generally outperforms the dipole because the dipole is so low. Its total length is 85 feet. I personally use the MFJ-998 1. the re was probably still some rf on the outside of the coax, but it didnt cause any issues anymore, like interference in the PC speakers etc. Current Balun - OCF Dipole (too old to reply) Does the OCF dipole require feeding with (thanks for the tip on the MFJ). Join me, W5KV, as I deploy a popular ham radio antenna for the HF (High Frequency) bands - the Off Center Fed (OCF) Dipole Antenna. The same is true of 10 meters; as frequency goes up, multibanding gets more quirky, and SWR curves and efficiency suffer. Available at www. Height is the key with horizontal dipole based antennas for DXing. The wire used in the construction of our BALUN’s is a High Voltage High duty cycle, High Frequency wire. I think we do a real disservice to new hams suggesting they use a G5RV rather than an OCF. But wait, a choke is needed?! That wasn't mentioned on the website at all. W2VS traps are available for 80 meters and up in two versions. The 160 meter OCF Dipole and the 160,80,40 Meter Fan Dipole run east west, and the 40 Meter Dipole runs north south. Then I contacted Palomar Engineers and bought the 1:1 new toroid RF beads. Le satellite Landsat 5 est en orbite autour de la Terre depuis 1984. The interaction between the radiating section and the feed-stub makes the G5RV usually easy to match on all-bands from 80 through 10 meters with an ordinary low-cost antenna tuner. The 80 ocf was not very good on 30. net is a Web site dedicated to ham radio (amateur radio). 95 MCR666 - 7 BAND COBWEB ANTENNA FROM 4 TO 20 METERS: 2 2. Categories. The balun project is a great introduction to what old timers. Instructions for Simple Multi-Band Vertical This PDF explains the antenna and has tips for its construction. DX Off Center Fed Dipole (OCFD) sometimes known as a Windom, if DX is your goal then RADIO WAVZ brings you new technology at an affordable price. 15 for Director Low Mount Halfwave is: 127. The measurements below are for building a simple Dipole Antenna. Due to the fact that one wire leg of the antenna is shorter than the other, the OCF is more convenient to erect than a regular center fed dipole. This is a DenTron MT-3000A, I had a MFJ-989C which initially worked on my G5RV antenna but after that blew apart twice (another MFJ Product) I decided to build a Carolina Windom OCF Dipole and have it installed at 75' on my tower and haven't looked back. Traps for different bands can be combined onto one dipole to create a single antenna tuned for maximum gain on all your favorite bands, from 160 to 10. All the crimps on this antenna look like this one, I saw not one shallow crimp. MFJ: MFJ-1020C Indoor Active Antenna 0. Suggested lengths for high impedance feedline on dipole type antennas Good lengths are green shaded area in the chart below. MFJ Enterprises Original MFJ-913 Balun 4:1 Current 300 Watts by MFJ in Camping & Hiking. 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. How do we get back the 160 meter resonance? By placing a series. I have put up many dipoles, windoms, and skyloops over the years in different locations all home brew. But this time was a fiasco. MFJ: MFJ-1020C Indoor Active Antenna 0. The tuner that came with my HF radio has a built in 4:1 balun in it and connections on it for ladder line. com FREE DELIVERY possible on eligible purchases. Height Compensation: Element feedpoints are compensated for typical mounting height,. Why I built my own Vertical Dipole. It is at about 80 feet up in the clear. A multi-band wire antenna that performs exceptionally well even though it confounds antenna modeling software Article by W5GI ( SK ) The design of the Mystery antenna was inspired by an article written by James E. YeahWay Wrong alright! Just proved: "It's A 10K World!" sorryjust couldn't help myself I'm with JenBosthose numbers don't really add-up. The antenna is a short, base-loaded dipole. Does anyone have an explanation as to why the resistance value. 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. The springs running towards the top of the picture apply tension to the insulators that are connected to the open wire feedline running back to the house and hamshack. 90 feet one way and 45 feet the other. Last year on Field Day I was able to use an OCF dipole for the first time, and I enjoyed the quick bandswitching it allowed, so I thought I'd try and find a good OCF. is almost certainly not 1:1. as a vertical with counterpoise results under testing but at 10 feet resonance is 13. The H-422 is a broad-band, compact, rotatable dipole designed to offer excellent performance even when mounted at only 10-15ft above ground in a V or horizontal configuration. Don’t worry about the total length of the antenna. Being that the antenna is pretty much at the same height, and oriented about the same as my OCF was, I’m not expecting a big boost in performance, but I figured that the antenna might radiate a bit differently, and maybe allow me to work parts of the amateur bands a bit more efficiently than I. 5 foot 450 ohm matching section ending in an SO-239 coaxial connector. The springs running to the left and right in the picture apply tension to the insulators that are attached to the North and South legs of the dipole antenna. 80-6 meter OCF Dipole & Antenna Tuner Demo Part 2 Back. This is the robust high-power version of the MFJ-2010 with 14-gauge stranded copper wire and porcelain end insulators. Overview - This is the 6-40 meter Alpha OCF Dipole Antenna. The MFJ-1789 is inconspicuous and low profile -- not much bigger than a TV antenna and can easily be turned by a lightweight TV rotator (see Hy-Gain AR-500). I have horizontally isolated the dipole from its feedline by about 4 feet. Antenna is installed on an homemade non conductive standoff about 4 feet from my tower, and balun is about up 25 feet above ground. My Maxcon 3K80 OCF Dipole came a few days ago. W2AU’s operate at a low VSWR from 1. The optimal height according to others is 15 meters, which also sets the feed point impedance as well. pdf), Text File (. I'm trying to cut costs as much as possible and looking at using 300ohm ladder line instead of coax. The dipole was modeled at various heights from. 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. There is also an appendix on Anntenna Matchbox selection and another on Baluns, including how to build your own simple and effective balun for use with an Asymmetrical Matchbox. It can be fine tuned for lowest SWR just like a dipole antenna can. Is a Dipole better than a Cobweb Antenna? Ham Radio Aerials. This one does 40-20-10-6 meters. Halfwave Reflector is: 136. Buckmaster OCF Dipole Antennas Buckmaster's Best Coaxial Cables Antenna Support Rope Stringliner Reel with 270 feet of Twisted Nylon Line Harken Stainless Steel Pulleys Line-Grips RF Chokes CQ Magazine Archives Great Circle (Azimuthal Equidistant) Maps World Prefix and Worked All States (WAS) Maps HamCall Mousepads Custom Name Badges Amateur. Makers of G5RV antennas is a curation of 6 resources about , Ni4L ANTENNAS & ELECTRONICS, Moonraker, K4TR Antennas, RadioWorld Inc. If the dipole can't be put up very high then the vertical might be better. Although the traditional OCF dipole had very broad band-segments, the VSWR-minima of either the 80 m or the 40 m-band could not be perfectly aligned to the respective band-centers. (• Windom(for(10(– 40(meters(shown. 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. checked with a mfj 249 the ham bands except 15 mtrs were at less than 3. Gleichentags wird. New improved version now goes down to 100 KHz and up to 61 MHz < 2:1 SWR. 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. Configuration and Performance Trade-Offs. Then I finally started getting some real information. New Home of the Force 12 Antennas. MFJ MFJ-2010 7 / 14 / 28 / 50 MHz Off Center Feed OCF Ultra Light Dipole - with Balun - 300 Watts - SO-239. 13ω -j 1100 Ωused on 80 meters. With the help of Pat, F6IRF, I put WSPR into a 100% transmit cycle,. For more amateur radio re. Whereas a Dipole is a half-wavelength long radiator, fed in the Center of two equal length legs, the Off-Center-Fed Dipole (which I prefer to call a WINDOM) is a Dipole whose feedpoint is at a point removed from the center of the antenna. 17 one side. I have an OCF dipole but can only get it up in the air about 20 feet. Perfect for low-profile, portable, and QRP operation, these Ultra-Lite antennas weigh less than 2 lbs. The SWR is less than 1. The MFJ-2012 is a “no-compromise” OCFD design for 40, 20, 10, and 6 Meters that delivers. The kit contains a large (ID = 1") snap on filter for the AC power Line protection and snap on ferrite beads for 4 sprinkler control lines. The next generation in Design and manufacturing. See more ideas about Ham radio antenna, Ham radio and Dipole antenna. Dipole Antenna Calculator. The SWR is generally below 1. 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. Configuration and Performance Trade-Offs. A good example of this would be a standard 40- and 160-meter dual-band dipole (2B4016) and an 80-meter full-size dipole in an inverted vee configuration with the same common feed point. An Evening with Martin F. The concept of the KGD antenna - a (very) short, base-loaded dipole. long the standard of the industry the W2AU baluns are built to last! The W2AU is the preferred Balun of Amateurs worldwide. Following Red Line at the top, you see that the gains drops away more rapidly as the dipole is bent toward ground. 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 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. But with a. Not much to write home about. February 7 of 2010 was a quiet Sunday. look 10 Meter Antenna now! purchase 10 Meter Antenna from Ebay. Our Products >> DX OCF WINDOM 80m,40m,20m,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. Nashua Area Radio Society › Topics In All Forums › Elmering Forum › OCF Dipole Help This topic contains 12 replies, has 3 voices, and was last updated by Fred Kemmerer 1 year, 10 months ago. 95 160M DX(OCF) WINDOM 266FT $149. Brings a whole new meaning to 30-Meter QRP. Real Gain: Delivers a 6-dBi ground-rein-forced dipole pattern on the fundamental and a 9-dBi full-wave cloverleaf on the second harmonic. When an antenna that is one half wave length long has RF energy applied to it at its resonant frequency a standing wave develops on it. It needs no tuner on 40m, 20m and 10m. 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. Here is how I managed to get pretty decent results with a homemade antenna. As typically installed, it is a compromise antenna but great for portable use because it is easy to pack and easy to install. Dipole Antenna Calculator. Resources listed under Multiband antenna category belongs to Antennas main collection, and get reviewed and rated by amateur radio operators. Due to the fact that one wire leg of the antenna is shorter than the other, the OCF is more convenient to erect than a regular center fed dipole. QRZ Forums - Antennas, Feedlines, Towers & Rotors for Tuesday 19 September 2017 Showing 1-1 of 1 messages. I have this situation. I have the Buckmaster 7 band OCF dipole, and it performs pretty well. Here are some critical guidelines: Unless your OCFD will be at least 25m high (80 ft. 6 MHz and you arrive at an overall length of 130'. 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 MCR666 - 7 BAND COBWEB ANTENNA FROM 4 TO 20 METERS: 2 2. the re was probably still some rf on the outside of the coax, but it didnt cause any issues anymore, like interference in the PC speakers etc. I have horizontally isolated the dipole from its feedline by about 4 feet. However, there should be some provision for antennas. 73 Vaclav. My question is if the feed point is at the center which is the 90 degree point, since a have wave dipole would be 180 degrees. The matching balun provides a low VSWR on all four bands. the modern version of the Johnson Matchbox is the MFJ-974hb , it is based off of the Johnson matchbox but uses a 12 position inductance switch so you can tune all the bands, im using this one now with the 40m dipole with 300ohm twinlead. 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! This Apartment Antenna lets you operate 40 through 10 Meters on. For the dipole arms a hardened and prestressed copper line with a cross-section of 2,5sqmm and a harder PVC isolation is used. This is the robust high-power version of the MFJ-2010 with 14-gauge stranded copper wire and porcelain end insulators. 6 MHz and you arrive at an overall length of 130'. I call this homebrew project my "Fishing Reel" 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. I was talking to a operator last night that sounded really awesome on a Yaesu FT101, it sounded like nothing I ever heard before. 40/80 Meters Vertical Antenna. Halfwave Reflector is: 136. Post #106 How to construct a multi-band dipole using speaker End fed portable all band dipole setup and 150W ma $20 HF Portable Antenna Project. Each dipole kit contains a glass-filled Budwig HQ-1 centre insulator, two Budwig HQ-2 glass-filled end insulators, #14AWG insulated 168-strand copper wire, and 50 feet of solar. Halfwave folded dipole is: 128. Click the "Edit" button at the top of the page to make changes. Place a 1:1 Balun on the Antenna end of the Feedline. Buy OCF Dipole 7 Band 80-6 Meters Antenna Poly-Stealth 61 core: Antennas - Amazon. The Wire Size can range from 16 AWG to 12 AWG. FT-857D and MFJ-945E - tuning a light bulb antenna. No Radial, vertical dipole design is Smarter, Stronger, more Elegant, and HOA approved. The completed rotatable dipole antenna was temporarily affixed to a galvanized push up steel mast and was tested and adjusted for best SWR using a MFJ-259B antenna analyzer, and a Rig Expert AA-230 antenna analyzer to fabulous results as shown by the following images. ~Dipole Tuning for Lowest swr~ The Easy Way! Find the correct "Constant" Due to the way modern ham radio transmitters are designed, we all try to tune our dipoles for the lowest swr so our transmitter will provide maximum output to the antenna without a tuner involved. The trap dipole offers similar multi-band performance. Christoph Zehntner HB9AJP wird am 16. BUCKMASTER DX-OCF 7 BAND 80/75 40 20 17 12 10 6 Meters Off Center Fed Dipole Low SWR 300 Watts Max. 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. I only have 100 watts and using this antenna I can break pileups on 80, 40 and 20 meters. It also works fine on all bands above 40m with a tuner, and even below 40m on 60m, and 80m, although the coax losses will be higher. Communication Radio Supplies ensure it is an easy task to keep in touch when you find yourself trekking or hiking outside and construction personnel relies on a Communication Radio Supplies is very important in every part of your lifestyle. 95 Special Order. is almost certainly not 1:1. MFJ-1234 RigPi Station Server Remotely operate your Rig from anywhere in the World using a web browser, mobile phone, iPad, tablet, laptop, desktop or even a Kindle! Use nearly any transceiver with CAT control, old or new, no computer or computer knowledge needed. pdf), Text File (. An Evening with Martin F. Currently running a 40m Double Bazooka and a 40/20/15/10 Shortened Dipole - getting decent performance from both. 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. The JK401 is a simple Hi-Q coil loaded rotatable dipole, with a small footprint as well giving great performance on 40M. The MFJ-1778 (G5RV) consists of a 102 foot flat top fed with a 32. The loaded dipole opens up the the options for many armature radio users faced with space constraints. It can be constructed a variety of ways, but Figure 2B shows the technique I used to build my first antenna. Chameleon Antenna has been a pioneer at rethinking and redesigning portable antenna systems since almost a decade! Pushing the limits of design and manufacturing with cutting edge technology, Chameleon Antenna are known to design, manufacture and distribute products worldwide that are versatile, dependable and built to last!. Each dipole kit contains a glass-filled Budwig HQ-1 centre insulator, two Budwig HQ-2 glass-filled end insulators, #14AWG insulated 168-strand copper wire, and 50 feet of solar. Tests have shown that the CAROLINA WINDOM 40 far out performs conventional antennas under similar conditions. Antenna is installed on an homemade non conductive standoff about 4 feet from my tower, and balun is about up 25 feet above ground. Super-strong injection-molded center insulator with built-in SO-239 connector and hang hole. I'm using it to demonstrate the resonance of the Windom on different bands. For me it was a ‘cat-whisker’ crystal radio receiver before I was a teenager. 36 one side. Buy Hf Dipole now. The quality workmanship is far superior than others. For an 80-10 meter OCF dipole antenna, divide the ½ wavelength standard of 468 by the lowest operating frequency of 3. 19 meters above ground versus a 31-ft/9. From the 7.