Short 40m antenna. I have to shorten it.

Short 40m antenna The roof on the building is not that big that I could install a full size dipole or inverted V. First it covers the whole 40m band without an ATU with an SWR of less than 2:1 from 7. It was a long weekend and the weather was fine. Space Saving Ant. Losses are building up in the tuner and coax. 0-7. The JK401 is a simple Hi-Q coil loaded rotatable dipole, with a small footprint as well giving great performance on 40M. Measure a 2. Some designs connect one end of the secondary coil to the antenna socket, which then makes the coax shield act like a counterpoise. The design incorporates techniques like linear loading and capacity hats to reduce the antenna's height while maintaining performance, especially on 40m and 80m bands. Dec 28, 2016 · This question can be a bit confusing. wanted high efficiency 40 Meter antenna with low-angle radiation. The link to this resource has been on our site since Monday Sep 26 2005, and it has been followed 27775 times. MAKE ALL LENGTH ADJUSTMENTS IN THE HORIZONTAL LEG OF THE ANTENNA. Design Software. Introduction. Short Antennas. 1 Meter(13. 3MHz and better than 1. The antenna is not symmetrical and there is no advantage to trying to shorten or lengthen both diagonal legs. Mar 28, 2025 · Antennas for mobile operation 7Mhz ,10Mhz, 14Mhz, 18Mhz, 21Mhz, 24Mhz,28-430Mhz 40 thru 10 Meter Zepp Antenna A modified 20 meter double zepp wire Operating Bands: 40 thru 10 meters (with tuner), basic construction and performance information. DX Engineering 40 Meter Fast Taper High Performance Vertical Antennas are self-supporting vertical antenna radiators that operate over the entire 40 meter band with an SWR of less than 1. The antenna is probably too long. This particular vertical antenna build is based on my original Shortened 40 Meter Vertical but with the addition of being able to short the loading coil at the proper tap point for resonance on the 30 and 20 meter bands. 160M Windom. NVIS dipole. All-Band OCFD. While functioning as a full-size dipole on 20-meters, it's also an ultra-efficient end-loaded dipole on 40-meters. N6BT has done repeated tests that show that a flat-top dipole mounted at the same height as the apex of an a youtube video of a short delta loop antenna only 8 5 meters per side this project use a loading coil of 56 7 uh for electrical matching . Sunny and warm. And in most portable situations, it primary selling point SMALL size was not really needed. This antenna is made for the Ham operator that ís looking for a compact dipole antenna to work on 40M. In this video I use materials on hand to build a 40-meter amateur radio dipole. 6 length, I found a 100 meter roll of 6 core telephone wire and chopped 15 meters off it. 1 MHz Band. With my Dentron Super Tuner, I can tune the antenna on any HF band 80m and above, and it seems to work just as well or better on 40m and 30m as did the fan dipole. This short vertical is one of those which has been "in a box" since last year. 40m & Short 80m antenna was deployed as a sloping wire antenna using the 10M fibre glass fishing pole and a hook on the house‟s gutter-board. Phillystran boom support trusses are used in the Cushcraft XM240 design for extra boom stability. 25 metre length of 24/0. This antenna is a dipole with lumped-constant loading. With an EFHW antenna since it is fed at the end of the antenna, the impedance there is 2000 – 3000 ohms. The Classic Dipole. The antenna was then tuned to the portion of the 80m 40 Meter 2 Element No Measuring Pre -Drilled Color Coded Stainless Steel Hardware MOSLEY MODEL SF-402-A MOSLEY ELECTRONICS Sales: 800-325-4016 Technical: 636-583-8595. Other designs, such as the popular commercial EFHW-8010, connect it to s separate screw/output so that you can either connect a short counterpoise or connect it to a ground rod. Wire Antennas. The JK402 is a short boom 2 element 40m Yagi that has excellent gain and F/R. Mar 31, 2025 · Build a space efficient trapped dipole antenna for 40-80-160 meter bands using RG-58 and PVC pipe. There are too many other uncontrollable factors in the real world of antennas to be concerned with that. The primary antenna was initially tuned for 40m and an SWR close to 1:1 was obtained over most of the 7. Full 20 meter band coverage is available by simply telescoping the tubing to 16. Since I wrote that blog post, I put up a homebrew version of the Cobra Antenna. On 40m, it worked a treat. Carolina Windom. 2MHz, this is not a characteristic that most ‘short’ dipoles Apr 15, 2020 · GOOZEEZOO Radio Antennas JPC-12 HF Antennas for Ham Radio with Slide Regulator 7MHz-50MHz All Band Hf Vertical Antenna 40m-6m 8 Bands for Outdoor 4. DX Engineering 40 Meter Fast Taper High Performance Vertical Antennas. I needed to make this longer though so I could run high power in a comfortable manner. Aug 28, 2015 · The picture above shows the Balun mounted on the mast about 10 feet from the ground. May 1, 2008 · Using a tuner near the transceiver with a coax fed too short antenna is not the solution. As I work mostly QRP, I need to minimize RF losses as much as possible. Let’s try this first with a 40m inverted V This meant I needed to build a portable shortened vertical for these bands. Time to test the 40m antenna. The Sloper. 75 portion of the wire and attach the wire to the plastic former. 5:1, and are less than 35 ft. The document provides a brief guide on building a compact dipole antenna appropriate for the 40, 80, and 160-meter amateur radio bands. Double Doublet. 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. It is made with very high quality materials and the Cushcraft HF Beam Antennas. May 4, 2008 · Short 40m dipole antenna, part 2. Thanks for your comments. This antenna is made for the DX'er thatís looking for an antenna to work across the globe. We designed and built this antenna to mount just below our tri-bander at about 70’ on a crank-up tower. Some antenna adjustment and pruning to compensate for these variable conditions is nearly always required. Antenna Calculator. long dual-band resonant antennas. 5Ft) (M10) Shark Antennas S-FM15 Mono Band HF 15 Meter Mini Mobile Vertical Antenna with 3/8x24 Threads, Handles 250W Max a rotatable 40 meter dipole antenna designed and constructed to fit within backyard constraints the project utilized two fishing poles attached to a fiberglass center pole resulting in an easy to build lightweight and cost effective antenna essential materials included fishing rods a center support pole mast support and basic tools linear loading was implemented to achieve the necessary length Antenna Books. MFJ 17754 40/20M Dipole Antennas. For maximum efficiency use the largest practicable diameter wire for both the loading coil and the dipole legs. Small Mag A more efficient version would be to feed a linear-loaded dipole short ham antenna directly with 450 ohm ladder line or 300 ohm twinlead. 10 meter dipole "Loaded" Dipole. The equation I'm often asked how to make a dipole. K6IF/W6BDN 40 Meter Rotatable Dipole . tall. 076 insulated wire, and a 160 mm length of 40 mm o. Antennas/40M/40 meter Dipole Antennas; Antennas/Wire; The title of the main category is Wire and it deals mainly with Long Wire and Dipole Antenans for ham radio. Selecting. I have to shorten it. The center pin of the coax is attached to one end of the antenna and the shield to the other end of the antenna. 6:1 from 7. HF Vertical. Mar 28, 2025 · This Vertical antenna design by David Reid for lower bands focuses on achieving effective DX communication by optimizing the antenna low-angle radiation for long-distance contacts. Hope that helps. It worked but not necessarily as well as or better then others. The inductance required is based on the antennas total width (A), the distance from the center of the antenna to the loading coil (B), the wire diameter (D) of the radiating elements, and the required operating frequency (f). 17/10 Last updated The DELTA C-140 is a rugged 40m rotating dipole which is just 39' (12m) wide - SERIOUS HD!! The Delta C-140 has a number of unique benefits. It gave me 40, 20 and 15 with a push because although a 40 meter dipole should give you a resonant 15 meter antenna, in this case – with the coils for 40 – it mucked the maths up and caused the ATU some trouble. Wind 40 turns of the wire onto the plastic former, and firmly secure the end of the winding. You may operate these dipoles at up to 1,500 watts! After installing the antenna, measure the SWR to find the resonance of the antenna and note it. At heights of 30' to 100' (10 to 30 meters), it will work well, as long as its physical length is longer than 0. 5 ft. HOA HF Vertical. 2 λ . Indeed, the TUNE button easily swallowed the incorrect size of this antenna for the whole of the 40m band. Stripping off the 10. This was before I had my baluns ready. May 4, 2008 April 6, 2016 - by Joost. When I used the antenna a choke balun of type W1JR which was attached direct to the connector of the antenna. Cut a 10. Listed under the Antennas/40M/40 meter Delta Loop Antennas category that is about Delta Loop antenna projects for 7 MHz. We can also provide you with custom settings to suit your operating preference such as peaking your gain and F/B in the CW portion or the Phone portion of the band. I hung it on the antenna test rig I bui Sep 5, 2014 · Hi, guys. So far it received 34 votes for a total score of 5. So in order to match the antenna to the coax / rig, you need a transformer on an EFHW antenna to get it down to 50 ohms. HF Military. A vertical seemed the obvious answer, a naturally low-angle radiator. 160M End-Fed. My inverted-V at 40 ft. Homemade Ant . The solution : build an antenna for 40 and 80. The antenna is fed with a relatively short run of LMR-400UF coax inside an underground conduit. The antenna’s 2:1 SWR bandwidth with the Balun covers the entire 40m band. d plastic tubing ( white plumbers tubing). performs well, but is “a cloud burner,” good for local contacts within 500 miles. 0MHz to 7. MFJ-17754 40/20M Dipole Antennas are shortened, coaxial-fed, 42 ft. 40m/80m Portable antenna Portable wire antenna for 40 and 80 meter made with a RF Chocke. Adjusting When all is done the final check is if the antenna is in the 40 meter band. Cushcraft XM240 Monoband 40 Meter Yagi Antennas utilize rugged Big Thunder hardware combined with high-strength aluminum tubing, which provides outstanding wind survivability. 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