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40m ocf dipole design


40m ocf dipole design Out performs a 102ft G5RV hands down!!! RadioWavz DX40 Off Center Fed (OCF) Dipole Antenna - 40, 20, 10, Jun 04, 2011 · My antenna’s are an 80 meter loop at 65 feet, a ZS6BKW at 60 feet,, an 80 meter dipole at 60 feet, and an 80 M OCF at 60 feet, i am able to switch between them all, overall the 80 meter loop is the best performer, quieter on receive and gives me SWR’s below 1. Designed to operate on all bands from 40m (7MHz) – 6m (50MHz). The balun is of the current variety, based on is the Guanella design. 20 40 60 80. Don't try to run an unbalanced line without. The OCF Master design uses a capacitive tuned element that allows for a shorter overall length. This with 100 watts. Introducing the W8AMZ 80–6m OCF / Windom Multi-Band Antenna using a 4:1 Balun and rated for 2 KW. 8m 6. Adding a Director to a ¼ wave 40M HF vertical antenna. Copper clad steel UV insulated. Without a line isolator. 40m got kind of weird near the end of the first hour - maybe was some solar storm activity. Enter the desired frequency and select the desired calculation from the drop box. DX Engineerings 300 ohm line (VF=0. 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. A shortened Fan Dipole is a dual-band dipole with a full-size dipole also tied to the same center insulator. My garden is not very big so a 160m,80m dipole was out. However they can lack choking performance below 40m, adding a second CM choke below the balun is recommended. Note. (3/4 lbs. This is one of the most rugged and dependable OCF/Windom antennas on the market today. Get it as soon as Fri, Nov 19. $14. 56 - Multiband Dipole Antenna. mfj 2010 off center fed dipole specs. Insulators were made from sections of PVC pipe, with holes drilled in the ends to secure the wires. K6IF/W6BDN 40 Meter Rotatable Dipole . The coax is that featured at nanoVNA – RG6/U with CCS centre conductor MLL measurement and the matched Sep 03, 2018 · 40m Dipole Construction and Troubleshooting (#215). net Abstract A coaxial-cable trap dipole antenna installed in the attic provides a surprisingly effective solution to HF operation on the 10, 15, 20, 30, 40, and 80 meter amateur bands at a QTH with restrictive covenants that prohibit outside antennas. This UV Resistant/Weatherable polymer offers impact strength, heat resistance (melting point 223 °C, or 433 °F) as well it is an excellent electrical insulator. Shortened 40 meter dipole shown with OPTIONAL "BL 10-160-5KW" Balun. Electrically it is very different to a conventional dipole; it incorporates a balun and is almost like having two quarter-wave dipoles connected side by side. Dec 12, 2016 · SWR Measurements 40M, 20M, and 15M. height 5 - 10-m » 4 ÷ 1 balun height 10 - 15-m » 5 ÷ 1 balun height >15 - 20-m » 6 ÷ 1 balun IN STOCK! READY TO SHIP! Short 85 foot long dual band 80/40 Meter dipole antenna is full-size on 40 Meters and has ultra-efficient end-loading on 80 Meters. . Modeling Fan Dipoles and OCF Dipoles I have never been a big HF operator but i do enjoy the odd QSO on 160m,80m,40m,10m. 73 - Jody - K3JZD . In some cases and depending on the installation the use of an antenna coupler (tuner) is necessary. Using a tuner, 6, 15, 30 & 80m bands are May 19, 2014 · For the purposes of discussion, an NEC-4 model of an OCF dipole was created. Outstanding performance on all bands with a tuner. 40M Delta Loop SWR on 40M (7. 22 2. vertical dipole antenna for hf radio on sailboat. A 40m dipole at 70 feet is approximately 1/2-wavelength high and is likely to be good for DX and less optimal for local or short range communications. This means a center fed 40 meter dipole works well on 15, But not 10 or 20. 40 80 mt folded dipole design. It seems to work very well and is very quiet! One question please! Is the diameter of coil former 5. 6 m) off-center fed dipole antenna for the 20 m and 40 m bands designed for those who need to conceal an antenna. 86 18. loaded dipole. Out performs a 102ft G5RV hands down!!! RadioWavz DX40 Off Center Fed (OCF) Dipole Antenna - 40, 20, 10, FD3 (40m-20m-10m) OCF antenna by G8ODE The FD3 OCFD antenna is modelled using MMANA-GAL basic freeware antenna analysis software. Out performs a 102ft G5RV hands down!!! RadioWavz DX40 Off Center Fed (OCF) Dipole Antenna - 40, 20, 10, Mar 10, 2021 · The Pacific Antenna Dual Band Trap Dipole kit provides a lightweight, portable trap dipole. It is designed to resonate on a fundamental frequency and its even harmonics, in this case the 40, 20 and 10m amateur radio HF bands. To Order Foot Supplies è Answer (1 of 5): If it is a straight dipole, fed with coaxial line, what frequency is it cut for? Or, is it a fan dipole? There is no such thing as a dipole for 40 - 10. 40M Delta Loop SWR on 15M (21. It's also ideal for those who want a high performance antenna with world class DX coverage 80, 40, 20, and 10 meters. This article describes an antenna system for 40m based on: a ‘tuned’ length of RG6/U CCS coax. The 40m OCF Dipole, also called FD-3, is one of the most popular multi-band antennas in Germany. Here is my home HF antenna. OCF Dipole - This is a popular antenna design as the performance is very good across the HF bands and requires little or no tuning. 5:1 baluns designed for OCF antennas. 472 kHz WSPR TX/RX with earth electrodes. g. 472 kHz-George Smart-M1GEO. Click on Calculate and the optimum length for that combination will be displayed in feet and inches. The 4:1 balun provided somewhat sharper resonances and lower SWR at resonance in the 80/75- and 40-meter bands, but a low SWR was not obtainable in the 20-meter band. It has a second element for 10m-80m with traps for 10m, 15m, 20m and 40m. Antenna performance and 2:1 VSWR bandwidth is site dependent and varies with height above ground and surrounding objects. With 8. Out performs a 102ft G5RV hands down!!! RadioWavz DX40 Off Center Fed (OCF) Dipole Antenna - 40, 20, 10, The RadioWavz DX (OcF) Windom is ideal for those of you who do not use a tower and beam Its also ideal for those who want a high performance antenna with world class DX coverage 40, 20, 10, and 6 metersOutstanding performance on all bands with a tunerMade to handle the elementsUsed by DX contesters all over the worldRated for up to 1,500 watts (SSB) 67Ft copper clad steel UV insulated 4:1 BiFi Dec 19, 2020 · Applying the RG6/U to a 40m Inverted V Dipole antenna. Full band coverage can be accomplished with an antenna tuner. Out performs a 102ft G5RV hands down!!! RadioWavz DX40 Off Center Fed (OCF) Dipole Antenna - 40, 20, 10, 800 Watt Antenna Insulator Kits for 80M OCF and 40M/15M dipoles. 60 - Lazy Quad Antenna for 10m. in my rear yard, with three 10M radials. Out performs a 102ft G5RV hands down!!! RadioWavz DX40 Off Center Fed (OCF) Dipole Antenna - 40, 20, 10, Oct 23, 2006 · 6th May 2006 – I’ve attached a 20m inverted-V dipole to the same feed-point. It needs no tuner on 40m, 20m and 10m. Out performs a 102ft G5RV hands down!!! RadioWavz DX40 Off Center Fed (OCF) Dipole Antenna - 40, 20, 10, A year later, I started phase-two. All small antennas are like that, they radiate about 1% of what a full-size dipole radiates and in some fortunate cases they force the feedline to radiate another 5%. " THIS IS WRONG! THIS ANTENNA CAN WORK ON 15m! The Completed Antenna: This ended up weighing about 17 gr. For more information on antenna design, feedline and radiation angles, consult a reliable text such as the ARRL Antenna Book. $55. As far as a comparison of radiation patterns on 40m from a G5RV, a ZS6BKW, a OCF dipole, a CF dipole or invertedV, you will not be able to detect any difference, and neither will anybody else. 31 Mhz) without antenna tuner. Aerials include: An 80m Doublet, a 20m loop and a VHF/UHF “white-stick”. Modeling for the N6LF "Elevated Radials" QEX article Trimming Elevated Radials Elevated Radials - Near Fld Above/Below Ground Part 4. 5–3. A 40m Doublet is my preferred HF /P aerial. 40M Operation on Real-time Spectrum Scope. Here are a few possibilities for an 80-m antenna in the limited space. Oct 13, 2021 · Used 20m and 40m. OCF Dipoles - About windom antennas and OCF Jul 04, 2021 · The HW-42HP is an Off Centre Fed Dipole with a difference. The middle section was simply a 40m dipole, which was expected to provide little improvement over my old dipole. using a feedline isolator/balun to stop the RFI. Was much more confident in 0500Z measurements due to better SNR, but had identical 40m measurements, while 80m measurements only differed by 0. It is suitable for the harmonious bands (40/20/10/6m) and offers slightly more bandwidth than a dipole, with good SWR. 5MHz) and 60m (5MHz) via a good ATU. 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. This enables us to adapt an unbalanced fed system (coaxial cable) to a balanced antenna system (dipole antenna). 5:1 on 6, 10, 20, 40 & 80m bands and can be operated without an antenna tuner. My first antenna for HF was a nest of dipoles for 40,20,15,10m. 100 120 140 160. 9m 50Ω Coax Note On 40m the half-wave OCFD is 180&deg; long in electrical terms, and 360&deg;long - full wave on 20m and 720&deg;long on 10m -2 full waves long. 160-10 Meter W7FG True Ladder Line Open Wire Fed Dipole 240' Dipole With 150' Feed Line $234. It has one element for 12m and 17m with a 12m coaxial trap. RadioWavz DX80 Off Center Fed (OCF) Windom Dipole Antenna for 80, 40, 20, 10M The RadioWavz DX (OCF) Windom is an off center fed (OCF) dipole antenna that exhibits outstanding performance on multiple bands typically with out a tuner. " OCF-4010E-3K. This antenna wil be resonate on 6,10, 20 & 40m. Awesome Antenna Choice KB1SEQ "This is an awesome antenna that has exceeded my expectations. 40 meter loaded dipole @ 41 feet long. 160-10 Meter W7FG Open Wire Fed Dipole-240' Top Length Dipole With 150' Feed Line 600Ω Open Wire Ladder Line One Conductor from Balun or Tuner to Far End Insulator No Splices, Solder or Crimping to Add To Cart. I've bought several of their baluns over the years and they are very well made. This style windom has a 4:1 balun and is rated for 1500 W. pdf” e. K3/10 @ 5W to a 40M extended double Zepp or a 40M dipole. 40m Slopping Dipole vs Hustler 6BTV Antenna; 472 kHz Antenna. It is an off centre fed dipole, with 10 feet of vertical radiator. It competes in popularity with the "Half Size G5RV" from England. This assumes that antenna is 8. I have the balun and the wound inductor, but can't find any information as to the proper lengths of wire for this antenna. On the garden side, 20m and 40m legs are 45 degrees apart and in a similar plane dropping to Jan 07, 2021 · The EAntenna OCF series (aka Windom Antenna) is an ideal antenna for portable or stationary use. It will operate on 40, 30, 20, 17, 15, 12 and 10m without an ATU (SWR <3) plus 6m with an ATU. WB5BKL. Use 75 or 50 ohm cable to feed the centre of the dipole. With an antenna tuner, you can operate 12, 15, 17, 30 & 60m bands with AS-OCF-404-HP. . 40m mini portable End Fed Half Wave Tuner. 19 Hz, so I reported the 80m average. 44 $ 87. is my own design that is timed Mar 16, 2018 · My first test was to have 80 and 40 meters on one dipole. 2m fm folded dipole. Most people believe the 40m OCF cannot work 15m. A 40m coaxial trap can be seen in the picture on the right. BalUn means: Balanced to Unbalanced. 88) should also work well. In fact the only difficult part of an OCF dipole is the balun and I will be explaining how the balun works and also how you can make your own. The design was based on trap coils of high-Q with inductance chosen to produce 80m sections that would fit in the available space. It will provide years and years of great service and great contacts. Plus, there’s a 2m/70cm radio in the car. Solderless , crimped construction. 5 m above “real” ground with a conductivity of 5mS/m and a dielectric of 13. 52 0. This is not a new idea, but the method I am suggesting of doing it is novel, and possibly simple to implement ! The caveat is that it is fussy and unique to each antenna situation. The half-wave dipole is very simple to construct. 95 (Inc VAT at 20%) Copper clad steel UV insulated. In the case Manual 1:1 BalUn for dipole antennas. It was modified for amateur radio use in the 1950's. (peanuts) Total Weight w. 69m post 10 Oct 2021 Copper clad steel UV insulated. Operation on 12,15,17,30 & 60m will be tuner dependent. However, any OCF dipole easily outperforms afore- Copper clad steel UV insulated. Out performs a 102ft G5RV hands down!!! RadioWavz DX40 Off Center Fed (OCF) Dipole Antenna - 40, 20, 10, An Attic Coaxial-Cable Trap Dipole for 10, 15, 20, 30, 40, and 80 Meters John DeGood, NU3E nu3e@arrl. 5m, 30m: 7. Out performs a 102ft G5RV hands down!!! RadioWavz DX40 Off Center Fed (OCF) Dipole Antenna - 40, 20, 10, Slinky Dipole D C Shack B B C C C C D D F F F F Helical-Coil Dipole D C Shack B C C C C C D D F F F F Wound Vert Dipole C D Shack B C B B C C C D D F F F Fence Dipole D A Remote C C F F D D D D C C C B TAK-tenna D B Shack B C C C C C C C D D F F Antenna On Air Stealth Tuner Install Cost 6M 10M 12M 15M 17M 20M 30M 40M 80M 160M A 20-6 meter design that would fit in your attic would be an MFJ Cobweb (~9′ square); or, for 80 & 40 a loaded and trapped dipole, diagonally under rafters. 40m QRP with an end fed wire antenna along the ground. DOUBLE BAZOOKA antenna is an extremely broad banded Half Wave Antenna which can operate efficiently across an entire Ham band with little change to the SWR. level 2. With my main transceiver, I am able to hear traffic on the 40m band day and night. The antenna shown covers 80, 40, 20 and 10 meters with 15 meters and WARC bands. 500 99. Method: Hardware: IC-7300, 40m OCF dipole, Leo Bodnar wave sloper for 40M and a sloping 80M dipole both at a height of 50 feet. This 40m OCF is kicking butt. It worked! Band-changing from 80m to 40m was a nightmare though; out to the garden, lower the loop, connect the ends (or disconnect them!) and hoist the loop back up. Out performs a 102ft G5RV hands down!!! RadioWavz DX40 Off Center Fed (OCF) Dipole Antenna - 40, 20, 10, 2EØZEH has built a 40-m OCF dipole and would like to add an extension for 80-m. Ugh! Phase The RadioWavz DX (OCF) Windom is ideal for those of you who do not use a tower and beam. 52 10. "By design it has a good SWR only on 40/20/10m. It is approximately 110 feet in length and provides a relatively low SWR on these bands. I talked to my dad Les about the design. Further, the E-field only has one vector component and consequently the fields are linearly polarized. 75 S/H. 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. For a conventional antenna I would normally split this wire in half and place a feed point in the center. 47m, 20m: 5. MTR-3B w/500 mAH LiPo Battery Pack running 4w with K Ø MBT 3D Printed Mini-Mini Key and Earbuds to a 20m beam and 40m dipole. A n Off-Centre Fed Dipole for 40M, 20M, 15M, 10M, 6M & 4M plus 30M, 1 7 M (with ATU) What’s an Off-Centre Fed Dipole? A traditional Dipole is a half-wavelength radiator, fed in the Centre with two equal length legs, the Off-Centre-Fed Dipole is a Dipole whose feedpoint is at a point removed from the centre of the antenna. 02 Design Parameters. 0 m to 7. Home-built VE3SQB Coaxial Dipole antenna (aka Double Bazooka) The first HF antenna I put up was a coaxial dipole, the concept was developed by MIT. 7-strand, #14 g Someone mentioned an OCF dipole woudl work on 40 and 15, As it turns out neither band is EXACTLY that wavelength and thus a 3 to 1 relation exists. W2AU/W2VS Antenna Kit. This article describes a 40M vertical antenna director, but first we need to time travel to the distant past Mar 20, 2011 · ocf dipole with ladder line. Description. Use as a dipole, inverted V or upright V antenna configuration. 1 / 3 2/ 3. I cut a 6 foot section of wire out of the loop, half-way around the 40m loop as a daring experiment to give me a halo dipole for 80m. 080MHz to suit my own operating preferences. 0. On 40m the half-wave OCFD is 180° long in electrical terms, and Update on the 132 foot OCF Dipole (88+44 feet) – now using 23 feet of 450 ohm Ladder Line (3/4″ wide) to get it down to the shed where the 4:1 balun is located. Cumbersome cage dipoles or load switching arrangements deliver only partially satisfactory results. · Otherwise, a center-fed dipole or inverted-V (coax fed, with a 1:1 current-mode balun right at the feedpoint) is hard to beat. A short, off-center fed dipole for 40 m and 20 m by Daniel Marks, KW4TI Version 2017-Nov-7 Abstract: This antenna is a 20 to 25 foot long (6. It is an excellent all-around 40 meter antenna for those who don’t have room for (or can’t afford) a yagi, but want more than an inverted V. Nov 16, 2019 · Balun Designs sell both 4:1 and 2. 15 and 10 meters were short enough to hang at other angles in the yard, but 80 and 40 only fit running the length of the driveway. The OCF inverted V has a noise level that is 2 to 3 db higher than the hex beam and produces signal levels that are between equal and 4 db lower. more than the single core version. $87. This is the main reason I chose it as my first HF SDR antenna. Handles 1500 Watts. I came across a design in PW written by GM0ONX. The Famous 40m-6m G5RV Junior Half wave 80 meter dipole 40 Meter Dipole with 1:1 Balun This antenna uses high quality: - #14 Hard Drawn Copper Wire - WA1FFL Ladder Line LOC Center Insulator - Rated for 1KW - 80-6m G5RV Optimized ZS6BKW - Starter Series Classic G5RV Alpha Delta Model DX-40 - 40m Dipole OCF/Windom for 6m-40m WIN40 FD3 (40m-20m-10m) OCF antenna - G8ODE FD3 OFF CENTRE DIPOLE Degrees – see note below 0 20 40 60 80 1/3 90 100 120 140 160 180 2/3 Balun Transformer 4:1 13. Mhz) without antenna tuner. This antenna is wire dipole with no traps; overall length is 82ft. This antenna is based on the 80/40M trap dipole design found in the ARRL Handbook. In recent years, I’ve enjoyed operating portable in order to make the most of a better location. 180. 8 MHz) is exceptionally broad. Super-strong injection-molded center insulator with built-in SO-239 connector and hang hole. phaselockedtrout. Available in 20+40M and 17+30M versions Approximately 30% shorter than a full size dipole Weighs approximately 4 ounces. The short end was placed at about 40 feet off the ground, tied to a tree limb, using about 10 feet of insulated rope. ) Although the smaller cores won't handle as much power as the single larger core, it is still more than adequate for the power level intended for this antenna (100w). It is small enough to fit inside the attic of many homes. long wires suspended horizontally Copper clad steel UV insulated. The typical bandwidth is: 160M – 20kHz • 80M – 40 kHz • 40M – 300 kHz. First, I used a perfectly tuned 80 meter dipole to add the 40 meter antenna under. Out performs a 102ft G5RV hands down!!! RadioWavz DX40 Off Center Fed (OCF) Dipole Antenna - 40, 20, 10, Introduction to Off-Center Fed Dipole Antennas (OCFD) Also know as Windom My Goal • Need 80m &amp; 40m antennas for CQP (my favorite HF contest) • Contest bands are 80m, 40m, 20m, 15m, 10m • Need to repair my previous 80m OCFD • Need to be able to handle 1000 watts • Both antennas should be up &frac14; wavelength or slightly more for NVIS into California • Additional bands are a 40 - 6 meter off-center-fed (ocf) dipole The antenna was a half-wave in length using a single wire feeder of any length The antenna's SWR on 40m, 20, 15m and 10m is less than 2:1 and the Mar 03, 2011 · The G7FEK design will allow operation on 80m / 40m / 30m / 17m / 15m / 12m with the possibility to add the 20m band. 57 - Five-Bands No-Tuner Antenna. Handles power up to 100W of RF. 63 - Wire-Beam Oct 10, 2021 · 40m fan dipole for 40, 30 and 20m bands I used MMANA to design this antenna the dimensions of each of the legs each side are, 40m: 7. When I did, the 80 meter dip dropped in frequency. The W2AU balun is used with a pair of 40M traps to create a multiband dipole antenna capable of operating on 80, 40, 20, 15 and 10 meters. 4:1 BiFi BALUN Will work on 40m,20m, and 10m without a tuner. 24 Mhz) without antenna tuner. 6159, Portsmouth, VA 23703 for catalogs of pre-built antennas, pieces/parts, and plans. 4. Jun 06, 2011 · The Center-Loaded Off-Center-Fed Dipole Antenna (CL-OCFD) In order not to tease your curiosity any further, you will find an EZNEC -calculated VSWR-graph of the antenna below. Government. The measured impedance at resonance in the 80/75-meter band with this balun was exactly 50 Jul 07, 2020 · The OCF or Off Center Fed Dipole antenna is much like a conventional dipole antenna in that the formula you use to calculate the length of it is the same. Or maybe a fan dipole, with loaded 80 meter wire, and 40-10 full-length wires. On 20m leg has been hung about 6-12″ below the 40m leg. 90. 00. 61 - Tri-band Delta Loop Antenna for 80m - 40m - 30m. The 7 band OCF Dipole antenna was erected at 25 to 30 feet, on a hill side, using a military style push up mast, with a few customization on it. America on 20. - Alpha Delta Cover Sheet £144. 40M Delta Loop SWR on 20M (14. We shall see how many choose to either use a 4:1 or 6:1 balun for an OCF dipole. Of course it "collides all to hell". We designed and built this antenna to mount just below our tri-bander at about 70’ on a crank-up tower. Aug 02, 1998 · "This Old Dipole" or Dipole 101 An antenna construction workshop conducted at Marshall N1FN's QTH on Sunday, 8/2/98 Mission: Replace an old co-ax fed 40M dipole with a new one, fed with 300 Ohm ladder line and in doing so provide a "workshop" for the necessary techniques, and document the process for "posterity. 3. 16-7. I Use an OCF dipole with a 4:1 balun and find it works Jun 29, 2014 · W2AU Balun in place. 73, –kv5r DDRR - for 40M -- Directional Discontinuity Ring Radiator Antenna 40M Beam -- From QRZ 40M Triangular Full-Wave Vertical Loop Antenna -- From W5DXP 40M/80M Trap Dipole -- From QRZ 40 Meter Delta Loop By PY4VE Via K4TX ShortyForty Dipole-- By W5VM Via K7MEM ShortyForty Dipole-- From FlashWebHost Sterba Curtain 40M-- from KB8PGW Soapbox: 0500Z 40m signal was 30 dB greater than 0200Z 40m. 70 + $13. 44. MMANA-GAL 40m OCFD Model’s Results Wire 2mm diam, antenna at 8m above real ground 5mS/m and dielectric 13 SWR ref 200 ohms Long Side (L) Short Side (S) S/L+S RQ j XQ SWR 10. M0HZH. The form is similar to other dipole antennas i. Off-Center Fed FD3 (40m-20m-10m) OCF antenna - G8ODE. 58 - Dualband Full-wave Loop Antenna for 80m-40m. The main reason for using a BalUn is to The OCF dipole NEW TEXT,SWR CURVES,POLAR PLOTS An excellant multiband antenna for limited space, can be used without an ATU due to low swr under 2:1 on 40m,20m,15m,10m also covers 12m and 17m with swr less than 2:8. level 1. 6 MHz and you arrive at an overall length of 130′. 5, 7 and 14 MHz; Copper clad steel UV insulated. 55 - Multiband Z Antenna. The antenna above is my TEMTP or Twin Element Multi Trap diPole. If a dipole antenna is fed with a coaxial cable from the transceiver, it is always a good idea to use a “BalUn”. Homemade Carolina Windom antenna. 475 kHz and 137 kHz Winter antenna checks in Alaska. Hope you can translate English, have built this 'short 40M' vert. 20m/15m Dipole Horizontal Loop for 160m through 10m 40m Dipole with 15m "Capacity Hats" Impedance and Length, 1/2 Wave vs 3/2 Wave Horizontal Loop, Source R vs Height Part 3. WA7IRW: NV: W7 This calculator is designed to give the horizontal length of a particular dipole (including Tees) antenna, or one side of it, for the frequency chosen. multiband hf dipole antenna. 75. using 40m dipole on 15m. Coax: 348gr. The RadioWavz DX (OCF) Windom is ideal for those of you who do not use a tower and beam. Jan 05, 2020 · All of my HF antennas are being used with my main transceiver; so, I decided to install a 40m Dipole. 15:1 or better on the SSB segments on 80,40, 20, 15 and 10 meters using a mast RadioWavz DX40 Off Center Fed (OCF) Dipole Antenna - 40, 20, 10, and 6 Meters. Package price: Antenna with balun $101. 8cm or 5-8cm? I used 34 turns round 5cm plastic pipe, and when tuned on a communications set it gave most back ground noise nearly dead on 40M! Copper clad steel UV insulated. Just some ideas. 40 meter dipole length formula. · 5y. This will handle 400W key down or 500W PEP. I tested the balun on 40 and 10m at “Study of the OCF Dipole Antenna -G8ODE iss 1. The antenna system will be centred on 7. 3 out of 5 stars 17. e. 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. 54 - All-Bands Dipole Antenna. Out performs a 102ft G5RV hands down!!! RadioWavz DX40 Off Center Fed (OCF) Dipole Antenna - 40, 20, 10, tuning. The dipole is about 40m in length and at 10m height above average ground, the model includes the common mode current path that exists on a vertical feed coax, a 4:1 current balun with choking impedance of 1000+j1000Ω at the top, and a 1:1 current balun with choking Copper clad steel UV insulated. FD3 OFF CENTRE DIPOLE . 62 - Dual-band Loop Antenna for 30m - 40m. N6BT has done repeated tests that show that a flat-top dipole mounted at the same height as the apex of an The antenna described here is commonly known as a Half-Wave Off Center Fed (OCF) Dipole or it’s cousin the Windom antenna. I noticed two things. 50. 2% relative bandwidth the 80 m-band (3. The SWR is generally below 1. YO9IRF. FREE Shipping. Balun Transformer. S. Hence, the dipole antenna is an example of an omnidirectional antenna. 5m and a slope of 2. After much research I decided that my first long wire antenna would be an OCF Dipole design. Initial reception comparisons suggest this has had a 10-15dB gain on 20m over use of the 40m dipole on the band. ground absorption. 19-21. Jan 31, 1996 · Check the ARRL Antenna Handbook and write. The coax Copper clad steel UV insulated. Mar 01, 2021 · Operating a center-fed dipole over the entire 80 m-band turns out to be particularly challenging. The DOUBLE BAZOOKA antenna design was first conceived as a radar antenna in the early 1940's for use by the U. The OCF dipole does require a balun. ( By the way dads callsign is G6SXB ) The dipole antenna is symmetric when viewed azimuthally (around the long axis of the dipole); as a result the radiation pattern is not a function of the azimuthal angle . 59 - Loop Antenna for 10m. height above ground and end effects the impedance as well. 19-14. That is: 468 / Frequency Mhz will give you the overall length of the antenna. It is necessary to experiment for the length of the ladder line. May 13, 2012 · In summary, the ZS6BKW antenna is an optimized variant of the venerable old G5RV. 2m dipole measurements. 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. 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 Nov 25, 2015 · W8AMZ 80-6m OCF Dipole / Windom Multi-Band Antenna w/ 4:1 Balun. It is a dipole fed off center with a 4:1 current balun at the offset feedpoint. Mar 02, 2016 · I was recently gifted the RadioWavz DX40 Short sans wire. (OCF) dipole for 3. It is also possible to operate on both 80m (3. For 2m, a home-made Slim-Jim on FM, a 5ele yagi for SSB, plus simple dipoles for The Alpha Delta DX-DD is an 80m and 40m dipole. Out performs a 102ft G5RV hands down!!! RadioWavz DX40 Off Center Fed (OCF) Dipole Antenna - 40, 20, 10, Fig 3 - SWR v frequency for the off-center-fed dipole of Fig 2 at 40, 20 and 10 meters. Unlike the original G5RV, which requires an antenna tuner on all bands, the ZS6BKW / G5RV is capable of operating on 10, 12, 17, 20 & 40m bands, generally without a tuner, and with SWR readings usually at 1. The vertical dipole usually has a 3 to 6 db higher noise level, compared to the hex beam, and produces signal levels that are typically 3 to 6 db less than the hex beam. No common mode detected with coax grounded at home entrance. Coax fed OCF ‘Windom’ antenna. 136 Ft. Out performs a 102ft G5RV hands down!!! RadioWavz DX40 Off Center Fed (OCF) Dipole Antenna - 40, 20, 10, My W8AMZ OCF antenna installation in my attic. ascii art letters jesus. 5:1 or less. 4:1 BiFi BALUN Will work on 80m,40m,20m, and 10m Low Band Dipole Covers 160-80-40 meters with an overall length of only 100 ft. to Antennas West, PO Box 50062, Provo, UT 84605 and Radio Works, Box. For an 80-10 meter OCF dipole antenna, divide the 1⁄2 wavelength standard of 468 by the lowest operating frequency of 3. At an average of 20 feet, I am making SSB contacts to from Texas to Japan on 40 meters and Europe/S. BALUN Enclosure is an injection molding of PBT20-Polybutylene Terephthalate (PBTthermoplastic polymer) material filled with 20% glass fiber. 40m ocf dipole design

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