Your article was great and over our winter up here I’ll be working on a couple more antennas. Depending on the 2 meter and 70cm frequencies you choose for tuning your antenna, you might have to compromise a little. Using a tuner near the transceiver with a coax fed too short antenna is not the solution. I usually give myself an extra foot on each leg nowadays. 7-strand, #14 gauge hard copper antenna wire. The ingenuity part of a stealth antenna 40 Meter Antenna. 8 dB lower – Much less SWR bandwidth – Greater feedline loss away from resonance Build or Buy a Short Dipole? • Designing a Shortened Antenna CT1EOJ QST Oct 2003 • Model Doing the layout early on let me know where to place the 40 Meter verticals, and where the 30 Meter verticals go as well. Build your own Ground Plane Kit and use your favorite mobile antenna as a field expedient base station antenna! NOTE: We do not recommend using these mounts with 102″ mobile CB whips or mobile antennas longer than 48″. ١٦/٠٢/١٩٩٥ 49 You may also be interested in HF "Short" 40 Meter Mobile HF Stick So in this case, we want to build an antenna for 6 meters, 50. 6 METERS AND UP. Your Antenna Rotating System. We also have a 40 meter 4-square antenna to augment the other 40 meter antennas. This reduces bending and stress on the fishing pole. The antenna would have to be shorter than it could be if it were mounted on a smaller and lower vehicle, such as a pickup truck or a sedan. I could transmit with it by using an antennatuner. The antenna wire is 1. Note the color-coded wire element attachment snap swivels: Gray = 8 for 80 meters, Blue = 6 for 60 meters, Yellow = 4 for 40 meters. The new antenna had to have . Many hams who want to work the low bands need an effective antenna thatfits on a small lot. 2 MHz - The reactance should not be too high on both bands, to improve matching efficiency - A remote tuner will easily match this antenna from 3. 8 MHz. 40 Meter Four-square. Big Wires – A 160 / 80 / 40 Meter Multi-band Antenna. A random length of wire might work best for close field measurements on HF to 40 meters. Gain & Wavelength: 2M: 3. The 40 Meter loading coil in place on the antenna. Quad Antenna System by Pfeiffer Maltese Excellent Quad Antenna projects for 40 20 17 12 10 and 6 meters band in this pdf file project by Pfeiffer Maltese Build a Double Bazooka HF antenna This antenna is a full wavelength single-delta-loop, with the point of the triangle at the top of the single support pole, and fed near one of the corners - One Quarter Wavelength down the diagonal leg. I enjoy building my own antennas and the excitement it gives when making a contact. Build Stealth Antennas. 2 MHz 40 Meter Band Mobile Antenna. The 'Thunderpole AM PRO' antenna is designed to operate over the HF band. Fortunately, loss in small helices can be minimized by observing two precautions: Use large diameter conductors of low resistance metals — copper or aluminum, not I started by building a 40 Meter 1/4 wave vertical using aluminum tubing, then I made a second one to Phase with the first one. 060 MHz and 442. A minimum of 3 radials spaced 120 For example, if you wanted to make a dipole resonant at the middle of the 40 meter band (7. Using simple hookup wire and JTG5RVJR 10-40 Meter G5RV Type Antenna: Mobile Antennas JTNMO150 5/8 Wave 2m Antenna: JTNMO220 5/8 Wave 220 mHz Antenna: JTMA4B 2m/70cm Dual Band 11. a much flatter broadband impedance response, 2. Made out of aluminum tubing Uses PVC as an insulator Is 32 feet high I take it you don't operate mobile beyond 40 meters, then? Is it because an 80 meter mobile antenna is impractical, or just not your preferred band? For me, 75/80 is my preferred band but I'd like the ability to go all the way from 10 to 80. Blue line is a creek Antenna—BNC female chassis mount socket. Changing bands is super-easy — just change the tap on the “wander-lead” to the next band you From the Founder of Alpha Antenna; “This HF marine or mobile antenna works very well with an external tuner on 6, 10, 12, 15, 17, & 20 meters. 40 METER CW NVIS. I had used cubical quads for many years and the decision for 20 meters and up was easy, but what to do For 40 Meters? Some years ago I built a MOXON Rectangle antenna for 6 meters. Matchbox Antenna Parts Kit. the lowest bands, including 160, 80, and 40 on the reference antenna, whereas it would be nearly impossible to operate on 160, and only marginally possible to operate on 80/75 meters within a very narrow bandwidth on the other types of antenna in the test group, I decided to erect the reference type antenna. 40 meter Yagi antennas, are complex to build due to the overall antenna dimension, and the world wide web unfortunately does not offer many projects, but we discovered some realizations that could inspire you to build one. 160-Meter Operation . You can add different lengths of wire to make a nest of dipoles to be able to transmit on different bands. Hustler Standard Resonators are available for 80, 75, 60, 40, 30, 20, 17, 15, 12, and 10 meters. One big consideration was weight, 4 cage dipoles for 40/30/20/10 uses almost 1,000 feet of wire. This frequency is in the Technician band, so any licensed amateur operator can transmit and receive using this device. This is the most popular antenna in the Comet line for several reasons: Mid-size / mid-price range / open coil flexs to absorb brushes with tree branches / black color fades into the skyline – ground independent. • Please be aware, the NVIS is not a DX antenna!!! This antenna system was developed for reliable communication (within 400 miles) with 100 Watts or less power. 7 meters (tip of antenna). 40 Meter Reversible "String Beam" Antenna. Dipoles: The dipole antenna is one of the most effective and inexpensive antennas. Can be adapted to work on 160 meters by adding additional 6. 1 : 1 at the middle. antenna or simply an antenna you take with you for a field operation or when camping. Yes, you can certainly base load a 17 foot whip to get it to load on 40 meters. 5 SWR, calculations showed this would require a cage of almost 6 inches. 10 10. Adjustment:- Start by adjusting the 40m sections (A) and then the 80m tips This page goes through the theory, design, and construction of a 1/2 wave dipole. This post relates to the design and build of a 160/80/40 Meter magnetic loop antenna. The two photos depict a 40 meter resonant antenna before (left), and after (right) proper matching. The other is discon-nected. 53 dBi 63 –j74 vs 7. ). 00 to $500. Next, plug the antenna into your computer using the extension A Portable 75/40* Meter NVIS Antenna - with 3/2/'09 updates - by David B. ONE ELEMENT BEAM 20 THRU 6! 40 METER SUPER GAIN NVIS. 1 21. If you can find a Moonraker 4 that has at least the Boom and hubs (that are still ok to use) you are halfway home. 1:1 SWR at the antenna connector of each Vertical. On 30 meters with 40 Meter HF antenna with 3 / 8 inch base, works with most standard CB mounts. Metal box enclosure is mandatory. FLIGHT DATA G-METER GT-50 12V / 28V. 95. 95804 = 31. This is a top-loaded 80/40 meter vertical which replaced my Butternut once I installed a tower with a beam, and no longer needed a vertical to operate above 40 meters. For example, if you have a dipole antenna designed to transmit on the 80-meter band, the antenna tuner would help you transmit on other bands like on 40 or 17 meters and so on. The first (and most important) goal was to get the FULL 40 meter band at less than 1. This item HF Mobile 6-40 Meter Alpha Moto Antenna GRA-750B 7-56MHz Wideband Broadband HF Vertical Mobile Antenna, 120W(SSB), 40W(FM), 48. VK5AJL - Make your own HF-VHF antenna tuner. This coil came from a broadcast transmitter. 40 m Loading Coil Center 2 m Fed Remember Hustler HF Mobile antennas? This is basically what this design is-only mechanically mounted on a mast Just put to two of them back-to-back and use three resonators and there you have it-Narrow bandwidth and low efficiency on 20 and 40 meters Electrical Equivalent 10 m 40 METER 1/4 WAVE VERTICAL WIRE-MONOPOLE by W8AMZ. Build this Novice 4 band vertical Home made vertical antenna for 80 40 15 10 meters ARRL PDF file taken from QST June 1978 The 40 meter Stealth Vertical In the week when we celebrates Hidetsugu Yagi’s 130th Birthday we selected 5 homemade Yagi-Uda Antenna Project for the 7 MHz. 00 10. coaxial cable to feed the antenna, do not use more than 20 meters or 60 feet wishing to build his own antennas for VHF tranceivers. The Experiment: In this experiment were going make a Ham Radio 20 / 40 meter short coil loaded dipole antenna. The wires are each one piece with a length of 13 meters and taped (or use tyraps) to the fishing pole. S. For the 40 meter band, I like to cut each leg about 34 feet. Also, the efficiency is greater than a single wire dipole due to the six wire current distribution. Please note that the right photo shows a few ohms of reactance. It was best know for being used as a mobile antenna for 6 Meters and up, but Cushcraft actually sold scaled-up versions for Base-station operation all the way down to 40 Meters! I recall ads showing a "Christmas-Tree" of `Squalo' anatennas with the 40 Meter model on the botttom, and the other bands arrayed up the mast. 2 MHz EARTH EARTH 3 conductors #14, spaced 120 deg. Was $1399. Finished Radial Field Under The Antenna. VERTICAL 3. The first step in constructing the antenna system was to expand the existing radial field under the antenna. Super wide bandwidth means more time operating ,and less time stuck on a frequency your trap vertical is tuned for. 10 METER V FACTOR DIPOLE. The enclosure is shown on the right. With 20 years of in-house mobile antenna experience to draw on, Sherwood developed the SE-40 antenna system. Antenna selection should match the frequency band for VHF and UHF. KANNAD INTEGRA EASY ELT WITH ANTENNA. E. I have since fine tune the 20 / 40 meter trap dipole and this is a really nice antenna for limited space. Length of my Beverage antenna was equal to 20- meters. Finally‚ if an 80 meter antenna is too long‚ as it is 133 feet in this example‚ you can use the same formula to build a 40 meter version which will only be about 67 feet long. NOW LET'S BUILD A 40 METER SUPER - GAIN ANTENNA. The KL3JM 80 40 20 “SRI” Fan Dipole Build a 3 band reduced space multibander THE DIPOLE ANTENNA What is a dipole antenna? KL7JR END FED ANTENNA. One of the world-class mobile DXers, John Beale, KDOU, came to Sherwood with one request: Build a high efficiency 40-meter mobile antenna that would handle the full legal power limit. 5 to 7. Building stealth antennas to keep prying eyes from detecting your communications resources takes some skill and a lot of ingenuity. 3 measured about 100 kHz, the 40-meter at 40 kHz and the 75-meter about 20 kHz. 0 views. 900 MHz with 1 W, 2 feet away Yahooo Technologies - Offering Mobile Phone Signal Jammer - 8 Antenna, Up To 40 Meter in New Delhi, Delhi. HV7A: Mobile antenna system. On 60 & 80 meters, it’s a receive only antenna, although contacts have been logged. The problem has been addressed in numerous publications for years, including, but not limited to the ARRL "Mobile Manual", the ARRL "Radio Amateurs Handbook", Editors & Engineers "Radio Handbook" and many others. The minimum required coil form length is eight inches. This up and over, over and down design had been used in HF wire antennas. Antenna Guide Wire Launcher Air Cannon Plans; ARRL Antenna Projects Web Page; Antenna Topics; 9 Ideas to build a dummy load Courtesy of The DX Zone; Eagle 1St antennas Antenna Application Notes. The following photos and writeup are the results. MFJ 10-band HF/VHF Mobile Antenna. A quarter wave antenna mounted solidly to the vehicle roof is a great option, but I wished to avoid drilling into the roof for mounting or coaxial cable routing. Notice the stainless steel nut at the bottom of the coil. 40 meter NVIS loop; 40 Meter Phased Verticals-1/1. Part Number: MFJ-1640T. Antenna balun Courtesy AA5TB. Opek UH-405B UHF Mobile Antenna with NMO Connection Type. They are used commonly for ship masts, radio masts, wind turbines, utility poles, and tents. First, connect the USB WiFi adapter and USB extension cable. RM40 resonator and mo2 mast. The loaded dipole opens up the options for many armature radio users faced with space constraints. It’s best to find resonance on any antenna, but I’ve also found that there are sweet spots that work for different other ham bands. post 16 Sep 2021. Coils Traps Antennas Links →. There are two parts of the video, one showing you how to make it and the other Based on the experience I've gained with this project, I'll likely convert this coil to the 40 meter add-on coil for my 20m QRPGuys antenna when it comes. This should be low cost, and easy to build. We continue our antenna offerings with this single band, 80m-10m end fed half wave wire antenna. If you're looking for a low cost solution for a portable hamstick antenna pole for your ham radio, then check out this video. 75dBi 704 –j1167 vs 10. Read about company. 2 mm. Choose your mount below and add your choice of three Ground Radial sets. Each American made antenna covers a single HF band with a power rating of 250 watts P. It was originally made with a vertical in mind Yes, I’ve had lightning hit an antenna and yes I had to repair some damage. With that said, go look up the cost of one that is being sold in the magazines and on the web. 2 Frequency in Mhz 14. Background: The DX-EE uses coils in the 40 meter section, so small changes in the overall length have a much more pronounced effect on the SWR than in a full size antenna without coils. Looking at the same antenna with conventional feed we have: We have identical 40 meter gain, about 2. 75 db from the 138 foot high bi square. It is located at the 80-20 meter vertical location in the map below. This is an antenna that started out as a 2 element phased array, and grew up to be a 4 square in the Summer 2000 station rebuild. It can be erected in almost any configuration provided the wires are well separated otherwise it acts as a singe band broadband dipole. 03 inch, PL259 CHA EMCOMM III PORTABLE I take it you don't operate mobile beyond 40 meters, then? Is it because an 80 meter mobile antenna is impractical, or just not your preferred band? For me, 75/80 is my preferred band but I'd like the ability to go all the way from 10 to 80. The bottom section is maufactured using 3/8-inch heavy-duty fiberglass rod. W6HDG FAN DIPOLE ON A FENCE! A quick and easy hf multibander! THE MAYPOLE ANTENNA. My last vertical antenna experience relevant to the Hex Array came from the MFJ-1792 antenna. 250 watt PEP power rating. 40m 2el Yagi Ta7om Radio. These QRP radios will allow the user to send and receive CW signals, with a good antenna, that could reach 120 miles. 48 118 + j316 12 meter 10. 39 ft. 6 dBd gain on 40 meters with conventional feed. A few tuners of commercial origin "almost make it" only at the high end of 160 meters, but that is with the controls set at or near their maximum values. 00! Wow! These guys are making some good markup! Features of the K0WA 40 meter verticle. Something like a Wolf River loading coil is an easy approach and can be built to be modular with 3/8 x 24 tpi connectors that allow the whole thing to be bolted together like an erector set. You can hit a local repeater with a 2 meter handheld, letting you talk over a large metro region. If you need help choosing the right antenna mount please visit our antenna tutorial. 6 dBd gain on 40 meters, up about . 1 pi. Ver2cal'Wire'Antenna' • Actually'a'ver2cally'orientated' resonate'1/2'wave'dipole'with' the'earth'being'the' return ' half' • Due'to'poor'ground' conduc2vity'a The best test of a mobile antenna is to operate it on the lower frequencies. The net of all of this analysis was that we decided to build the Horizontally Polarized version of the 40m Delta Loop. I needed an “quick and dirty” expedient HF whip antenna mount for my Ford Explorer for use on an upcoming trip. Background: PY1ZA Full Size Vertical antenna - 40-meter ham band (7 MHz) This self-supported vertical antenna was made with aluminum tubes of 3 m in length that have an external diameter of 1 1/4" (32 mm) and a wall thickness of 1. The antenna is wound on a 8 inch fishing line caster and clipped Basically, an antenna tuner allows the operator to transmit on more than the one frequency the antenna is designed for. The Cushcraft 40m Yagi Has 43. Double Extended Zepp Antenna - 40 Meters Duplexer (Diplexer) -- and other projects from HB9ABX. 8 & 7. Loop antennas have always fascinated me. The coil is a bit over kill to just run 200 watts through it, but it was given to me. Further, I already had a nice 2m/70cm antenna available that extended about 40 inches high: a ½-wavelength antenna for 2-meter band, and 5/8-wavelength for 70-centimeter band. I wanted high efficiency 40 Meter antenna with low-angle radiation. Buy HF Short 40 Meter Mobile HF Stick Antenna 4ft: Radio Antennas - Amazon. Antenna wire was stapled to the fence. 5 MHz because the capacitors and coil are too low in value to provide a match at 1. Covers 80, 40, 20,15,10 Meters. 14 feet or (31 feet 1. See the drawings below for more visual perspective of the setup. Phil EI9KP has very kindly sent on details of the Delta Loop antenna that he built for the new 40 MHz / 8-metre band. tical antenna with 30. QRPGuys Portable No Tune Half Wave Antenna – $20. wound loading coil area of the Hamstick antenna in order to not shear the wire that passes through the fiberglass rod. That means to say that my half-wave antenna would resonate on 14 meters and 20 meters and 15 meters and 10 meters, which is quite nice. Emergency Amateur Radio Club (EARC) makes a parts kit for the EARC 6 – 40 Meter End Fed Matchbox available for those who want to build the matchbox on their own. My antenna is hung off the side of my 40 foot tower as a sloping dipole. I was not very hopefull, because the attic has metal wiring and vents, and also because it is covered by a slate roof. A guy-wire, guy-line, or guy-rope, also known as simply a guy, is a tensioned cable designed to add stability to a free-standing structure. 7 groundplane in mobile ” order_by=”sortorder” order_direction=”ASC” returns=”included” maximum_entity_count=”500″] QRPGuys Portable 40/30/20m Tri-Band Vertical Antenna – $20 Your PayPal receipt is your confirmation that we have received your order. 2 mm 7 strand stainless steel 20. ) long. 02 2268 –j1565 44 33 Angle of radiation remained identical 6 feet ends A 30 foot 18 gauge antenna wire is included. 40 meter HF Hamstick Style Mobile Antenna. All of our antennas come with 20' control cable, standard up and down switch, ferrite core, fuseholder and fuse, 3/8-24 stud and Here he has two doublet antennas, one cut for 40 and one cut for 80. ( 13 ). (It really isn't all that difficult. Tuning the COM-40VA 40 Meter Vertical Antenna is straightforward and intuitive. It covers 40 meters, too. 4¾ in. 27 foot hoa 10-40 meter no radial multiband foldover vertical antenna with unun view details; 33 foot 10-80 meter multiband foldover vertical antenna with unun view details; 43 foot 10-160 meter multiband foldover vertical antenna with unun view details; heavy duty foldover mount for any mast mounted vertical antenna view details • 40 Meters – No significant difference in gain or pattern – Slightly less SWR bandwidth • 80 Meters – No significant difference in pattern – Gain about 0. 7 : 1 and a best frequency of 1. The antenna I used (a weboost 301111) has 13 dbi of gain @800 Mhz where the LPDA being offered in this kit is only 7. I am also working on a 40 meter vertical and maybe I’ll use elevated radials. Shark Single Band Mini HF Mobile Antennas. W8SYD, had a 10db gain over a G5RV at 50 feet up, (a 160 meter G5RV). By John Portune W6NBC . Using CB Antennas on 10 Meters! By N4UJW. The antenna acts like a stacked pair on the vertical and a standard yagi on horizontal. ٢٧/٠٢/٢٠٢٠ 10-BAND HF/VHF 80-2M MOBILE ANT, 200W, 3/8-24 STUB The MFJ-1669 40-10 Meter Mobile Antenna with built-in Auto Tuner A brand new product from The following description should give you guidance on how to build a mobile antenna for HF bands yourself, using a very cheap CB-mobile whip antenna base. The bamboo bottom section is now reinforced with duct tape. The antenna is basically a quad opened up on the bottom. It has gain and wave angle comparable to a full-sized ¼λ ground plane antenna with radials . The end of the antenna is again a single wire from 6 to 8. 030 MHz. Durable Construction, Can be Used in Extreme Weather Conditions. Some ATUs run out of gas, so to speak, below 3. ALL BAND DOUBLET. The Procomm PCF Series monoband antennas are tried-and-true. Mobile Antenna Mounts. 4 #9130 30 Meter Hamstick 40 38 36 34 32 30 10. 16. Jar Capacitance Calculator For Coils. The Delta Loop is a very popular antenna on the HF bands and can be used with success at the lower VHF bands as well. SD330: 3. So the LPDA antenna is more consumer friendly operating over more cellular frequency bands with reasonable gain than a high gain frequency specific Yagi antenna. Tunes & Performs Without Radials or Antenna Tuners. The 40 meter resonator is built like the 75 meter resonator. This is due to basic accuracy of the instrument in question (≈±5%). 00. 15 10. Multi-Band Antenna - NO enough theoretical knowledge to build a Beverage Antenna. 40-meter vertical antenna that is the key to regular contacts with stations in Europe. The coil used is big enough to cover the 40 meter band as well. It is used in radio, microwave and fiber-optical communication networks as a convenient measure of absolute power because of its capability to express both very large and very small values in a short form compared to dBW, which is A yacht's mast is supported by shrouds and stays - nautical equivalents of guy wires. if I buy a new 1/4-20 tap! 2020-07-06 Yesterday I ordered QRPGuys new DS1 short portable antenna. This unique adaptation of a fan dipole lets you remotely tune the antenna for 75 or 80 meters by mechanical means. This allows the antenna to resonate on 40 meters, even though it is physically shorter than a 40-meter half-wavelength. The The antenna is very light and only requires 1 or 2 metres of RG58AU feed line to the rig. Double Extended Zepp HF Antenna. The center insulators are both at the same place. Building the BuddiHex Hexbeam mobile antenna that retails for $14. Overall Transmitting Antenna Layout Orange line is my road. Mobile- to-mobile contacts on 80 meters always have been possible up to distances of 1000 miles. Welcome to engineering design trade-offs. This antenna is an excellent performer, and ruggedly built. The total length of the radiating system is 10. A portable vertical antenna for 10 to 40 meters, designed for mobile operations can be used in a car as seen in pictures. 110 The Coaxial Resonator Match Frank Witt, AI1H If you use a dipole on 80 meters, you'd really like to feed it with coax and have an SWR below 2:1 across the entire 80-meter band. ASA WELCOME dBm or dB mW (decibel-milliwatts) is a unit of level used to indicate that a power level is expressed in decibels (dB) with reference to one milliwatt (mW). UHF 430 MHz - 450 MHZ Multi-Band HF Antenna. DX results due to the antenna‟s omni-directional radiation pattern and extremely low 22 degree take-off angle. Make note of the frequency shown on the 259B. It's probably the easiest path to getting on 40 meters with your mobile setup. 70cm: 5. Handles Up to 1000 Watts PEP. The 6 - 40 Matchbox antenna works great! Easily tunes with the Z100 tuner - very low SWR's on 20m thru 10m. The performance was excellent with good gain, great side and back rejection and seemed to work very well. Each antenna is installed and tuned to give a 1. We built it in the ARRL Lab, set it up outside, trimmed the wire for the lowest SWR, and got it on the air. 40m-10m DELTA LOOP ANTENNA - GU3WHN This simple broad band antenna is easy to build, has gain similar to that of a dipole and is tolerant of nearby objects. That is equal to going from 100 watts to 400 watts. Several late-night contacts have been made over distances exceeding 3000 miles on 80 meters. He merely screws the coax into whichever antenna he wants to use. Removable 3 foot top section. EggBeater Antenna - VHF/UHF From K5OE. The prototype for 2 meters made its first contact of over 200 miles while lying upside down on a picnic table. These are ruggedly constructed. Build or Buy—Your Choice. With the direct conversion receiver now working and tuned into the 40 meter band, it’s time to get to work on a better choice of antenna. Distributed loading radiates RF effciently for improved mobile DX. From the Founder of Alpha Antenna; “This HF marine or mobile antenna works very well with an external tuner on 6, 10, 12, 15, 17, & 20 meters. meter. Super-strong injection-molded center insulator with built-in SO-239 connector and hang hole. The overall height is about 24 feet. THE COBRA ANTENNA. A modified version for 20 and 40 meters is described too. It covers the entire 40 meter band with a SWR of less than 1. 66 in total. Frank’s antenna was designed to cover the bands from 6 meters to 20 meters with coils wound using 1 ¼” PVC pipe for support. Guess the antenna wanted to call 80/40 Meter Attic Antena I live in a tightly packed urban neighborhood without much room for antennas. The ABS box is approximately 1” x 2” x 3”. The skill part comes into play when it comes down to building antennas that will be sturdy and will perform optimally for the frequency/band desired. This vertical started life as a tilt over pole to support two inverted Vees at 55 feet. The element material came from the tops of W7CY's old 80M 4 square that was built on top of Hy-Towers, thanks Rod! Delta Loop antenna for 40 MHz. 42 51 –j86 20 meter 8. Andrew VK1AD has a great example of building Whip Antenna, Mobile, HamTenna, 40 meters, Wire-wound Type, Fiberglass, 2-piece, Adjustable, 4 ft Length, Each. For a donation of $56 (Including USPS priority mail shipping) club volunteers will build and deliver a 6-40 matchbox with a 30 foot antenna wire anywhere in the U. Resonator whip adjustment allows for the fine tuning of these efficient mono-band mobile antennas to the lowest SWR. 1 14. Now that a number of people have built them and provided feedback, several things to look out for have been identified. A friend, WA7YLI, has similar interests. Portable wire antenna for 40 and 80 meter made with a RF Chocke. When setting up the shortened vertical, I have found that its best to run the fishing pole through the center of the coil. 75" To build a low-cost WiFi antenna, you'll need a USB WiFi adapter, a USB extension cable, and a dish-shaped piece of metal cookware. - Includes: Allen Wrench and complete tuning and matching instructions. Skip to first unread message This antenna has never been mobile. 25 FreÇuency Mhz #9140 40 Meter Hamstick 40 38 36 21. There are 3 wires on the fishing pole between 4 and 6 meters. 40M Delta loop Antenna for 40, 80, and 160 Meters. The dipole would be great if it were in the proper environment, but this indoor, RF noisy environment is not conducive to picking up much. Several models have been constructed and have been in use for over a year. Temporary HF Mobile Antenna mount. Multi-Band Antenna - NO Due to the spacing , which is of course too short for 40 meter, the working is less than a real 40 meter antenna, but there is directivity with this 40 meter shortened hex. Most of the time, the 40 Meter Inverted V Antenna-Build; 40 Meter Inverted-V Antenna-Build; 40 meter Loop--Survival Podcast. Radials are also elevated. M2 Antennas Hf Beam 40m2l Shipping On Most Orders Over 99 At Dx Ering. The antennas are turned by a Hygain HDR-300 rotor. Find many great new & used options and get the best deals for 40 Meter Mobile Ham Radio HF HAMSTICK Style Antenna WHF40 From Workman at the best online How to Build a Dipole, Inverted V Antenna, 2 meter yagi antenna, a tri-band yagi antenna, a 2 meter qubical quad pvc pipe antenna, 40/80 meter Inverted V This means that a 40 metre dipole can also be used as a three half wavelength dipole on 15 metres. Work Hawaii for the very first time. I now have individual 80 and 40 meter NVIS antennas. I got lucky, because I was using 147. In the tutorial, you'll find out how to make this temporary mount that can be used when going out into the wild or just hanging around your home. September 1978 21 Fig. If you use an SWR meter or an analyzer at the base of the antenna you will get the most accurate readings in a timely fashion. It is designed as a highly portable wire antenna, easily set up The Antenna Farm : High Frequency Omni Directional - VHF & UHF Mobile Radios Radio Accessories VHF & UHF Hand Held Radios Antennas Mobile Antenna Mounts SWR/Power Meters Adapters Coaxial Cable Two Way Accessories Antenna Accessories DC Power Supplies Coax Cable Accessories Amplifiers Connectors Aviation Radios Repeater Systems Towers & Accessories Scanners & Receivers Duplexers Diplexers A Portable 75/40* Meter NVIS Antenna - with 3/2/'09 updates - by David B. Quad Band FM Mobile Antenna System. The W8AMZ 40m Vertical Wire Monopole antenna uses just three elements, a vertical driven element and two counterpoise radials, to deliver outstanding. The PVC pipe I had on hand was 2” diameter but as Frank noted back in 2000, the dimensions are completely flexible and the antenna can be built in almost any size. 00 Now $1149. 20 10. Well, in fact, there was enough room to put out 20 meters of wire, so I was able to operate on 40 meters now. com ✓ FREE DELIVERY possible on eligible purchases. Whatis(aWindom(• Itis(an(oﬀAcenter(fed(dipole(and(can(be(constructed(as(a(mulFband(antenna. 3 dbi. The RF Signal Strength meter responding to my Kenwood TH-26AT transmitting on 147. It received well on both bands. The Feed and Phasing cables are added. The A element is for 40 meters (and 15 as the third harmonic), while the B element is cut for and works fine on 20 meters. Then, attach them to the inside of the metal cookware using twist-ties, tape, or hot glue. asking $30 for entire array. The antenna is wound on a 8 inch fishing line caster and clipped the lowest bands, including 160, 80, and 40 on the reference antenna, whereas it would be nearly impossible to operate on 160, and only marginally possible to operate on 80/75 meters within a very narrow bandwidth on the other types of antenna in the test group, I decided to erect the reference type antenna. I built this small vertical because I could not uplink very well at low elevations and I just could not bring myself to drill holes in the roof of my new truck ٠٨/٠٦/٢٠٢١ The club's Field Day committee decided to build a new multi-band antenna for 80 and 40 meters for the occasion. 3 ProComm PCF40 – 40-Meter HF Fiberglass Ham Stick Antenna. Of top loading. Figure 1b – Complete drawing with parts list and assembly instructions for any band between 20 and 10 meters. 75 m and its square-shaped base measures 25 cm on a side. The solution : build an antenna for 40 and 80. 5 MHz 3 radials ~27 ft. The half square is a definite. There will be some Home Brew 80/40 Meter Vertical Antenna I once own a butternut antenna and sold it. Figure 1a – Front and side views of the vertical dipole antenna. If you want to go mobile, you can have a small, discreet antenna on your vehicle. One of the problems with HF mobile operation, especially on 160, 80 or 40 Meters is antenna efficiency. Oh…you can use the 40-meter dipole on 15-meters without modification. coil loaded 40 meter mobile whip antenna is seldom more than 5% efficient. By comparing them, you should be able to construct a tuner to your own particular requirements. This nit, and another one at the top of the coil holds the coil on the antenna. I can only compare my 40 m hex with my inverted v double bazooka 40 meter antenna ( fixed of course). Build A Shortened 40 Meter Vertical For POTA / SOTA Activations. Antenna was up about 45 feet on tree branch - wire length was about 52. This is a common range of front to back spacing for multiple element end-fire antennas. HVC21: 15m Loading Coil for HV7A & MV3A. 67 dBi 155 +j354 vs 8. 40m; 40m Compact 4-Square Antenna. 5 feet x . 40 Meter Inverted V Antenna-Build; 40 Meter Inverted-V Antenna-Build; 40 meter Loop--Survival Podcast. They can be highly effective as well as portable. While a 160 meter antenna won’t fit in your attic, one for 20 meters or even 40 meters will, often surprisingly well. 40 Meters Wire Yagi Antenna; 40-meter loop antenna; 40/20/10 Meter Fan Dipole Attic Antenna. If you live in an apartment or condo, a 2 meter antenna is easy to set up and unlikely to incur the wrath of your neighbors. 40 meter mobile antenna. 160 M TUNABLE COUNTERPOISE. I have purchased one, and the construction is superb. All of our antennas come with 20' control cable, standard up and down switch, ferrite core, fuseholder and fuse, 3/8-24 stud and QRPGuys Portable No Tune Half Wave Antenna – $20. D220R: Mobile Discone Scanner Antenna. Before i put up the Inverted L antenna i used a nest of dipoles . Prototype #2 was a "4 Band" ( 40 - 30 - 20 - 10 meters) antenna. The Antenna Farm stocks hundreds of unique antenna mounts to get that cumbersome project on the air. This is in the same range, it’s just another foot longer than the 33-foot length. Your PayPal receipt is your confirmation that we have received your order. , we do not ship This unique adaptation of a fan dipole lets you remotely tune the antenna for 75 or 80 meters by mechanical means. 0 14. 3 coaxial cable to feed the antenna, do not use more than 20 meters or 60 feet wishing to build his own antennas for VHF tranceivers. Yes, I’ve had lightning hit an antenna and yes I had to repair some damage. A Heavy Duty 4', 3/8" diameter black fiberglass rod lower section with integral coil, adjustable and removable stainless steel whip. New Pact 6 40 Meters Yagi. 45 feet. . The length was fixed by the length of the fence. Solderless , crimped construction. BY K5AXN. Since the antenna would be mounted on top of the van for good radiation efficiency on 75 and 40 meters, I knew that I would be limited in overall antenna length. It is designed as a highly portable wire antenna, easily set up Our motorized antennas and stainless steel mounts are designed with the most avid HAM radio operator in mind, as well as commercial applications. Antennas from QRZ Shareware 40 + antenna files. The linear loading part is 2 meters long (between 4 and 6 meters on the fishing rod). WONDER BAR ANTENNA. Solve Virtually Any Restricted Space Problem - 40 Meter Isotron only 22 inches x 16 inches x 15 inches! Easy, Quick, and Simple Installation. Designed for hams that do not have room for ground The Isotron Antenna. The dimensions of the Delta Loop for 40 MHz are shown below The 10-40 meter high performance groundplane freestanding vertical antenna is a rugged multiband vertical antenna. 5 SWR across 40 meters. Cost to build was very low and Construction was very easy. Quick Shop. And that’s all there is to it! This is a great first antenna! Your next step, after getting some air time, will be to insert some traps in that dipole so you can use it on 20-meters. A close view of the capacity hat for a 40-rneter vertical antenna. DualBand 2M/440MHz mobile antenna. My favorite antenna ever was a Off Center Fed dipole. HVC7: 40m Loading Coil for HV7A & MV3A. 23 28 –j421 30 meter 7. Losses are building up in the tuner and coax. 150 MHz), its total length would be 65. Operate 80, 40, 30, 20, 17, 15, 12, 10 Meters HF mobile and 6 and 2 Meters VHF with just one amazing antenna! MFJ-1699 features low SWR and 200 Watts power handling for a super-performing mobile HF/VHF antenna. 5 — Dimensions for a quarter-wave ver. This is important to sensitive, solid state radios. Standard 3/8-24 thread at base. The antenna is very light and only requires 1 or 2 metres of RG58AU feed line to the rig. It needed to work primarily on 40 meters and I wanted to use MS-116, 117 and 118 antenna sections that I had on hand. Below is one example of how to build and mount a 40 meter loaded dipole using basic materials. 87. Two piece construction, fiberglass base is 49 inches, metal whip is 48 inches. Alternatively, one could connect the two antennas together like a bow-tie antenna and leave them in parallel. Antenna Design and Software From Ve3SQV. Dy Mini Beams. 25 dBi 34 –j429 vs 6. Simply remove the nuts at the top and bottom of the coil, swap coils, and replace the nuts. Something else I have done is I labeled the one end of the loading coil as “top”. An antenna very similar to what I constructed is shown on page 12-8 of ON4UN's Low-Band DXing, the third edition. 95804 The number 0. The beauty about the 7 strand wire is it doesn’t knot or tangle unless you deliberately try and is corrosion resistant. 7 inches) This antenna is best when elevated 8 to 10 feet above ground. 100 MHz, which just happened to both yield a length of 19. They are made with the best materials and top of the line workmanship. (16’ft. There are many articles on compact 160 m antennas, but this is not one of them. - Standard 3/8 x 24 female thread type mounting. Changing coils is easy. Top Band, as 160 meters is called, presents a a challenge because the long wavelength leads to large antennas. Get contact details and address | ID: 23421858288 The cheapest way I have found to build this antenna is to find an old Moonraker 4. From $173. 1 metres long. The antenna has the advantage of being broad banded. ) This page details several T-match tuners. 8 MHz and inductive on 7. Eham. 95 to $229. The radial arms terminate in a loop of copper wire. Two Meter Vertical Loop Antenna. Normally as you move the feed point of the antenna the impedance will change‚ so you will need to use a 4:1 current balun with this antenna. If you're going to mount a two way radio in your vehicle than you're going to need an antenna and an antenna needs a good mount. With a power rated at 500 watts (P. Volunteers of the Honolulu Emergency Amateur Radio Club (EARC) carefully assemble the 6-40 End Fed matchbox antennas for those who prefer not to build one. common mode noise immunity (if space wound as shown). Hustler RM-40, 40 Meter Standard Resonator HF Mobile Antenna. DX Notebook Antenna Page many homebrew antenna projects. 5dBi 5/8 wave x 2. Mosley Electronics Manufacturer Of World Famous Hf Munication Antennas. With permission from Joe Everhart, (N2CX), we have adapted his 40-30-20m portable vertical With increased height 40 meter gain and pattern of distributed feed has changed to this: We now have about 2. HVC18: 17m Loading Coil for HV7A & MV3A. One can always play tricks with loading to be able to use a physically shorter length of wire. The 40m Vertical. 40M Delta loop 40 meter 6. End Fed Half Wave Antenna Kit for 10/15/20/40 Meters ARRL has partnered with HF Kits to bring you this easy-to-build 4-band antenna kit: an end-fed half-wave (EFHW) antenna. P. - The antenna is capacitive on 3. 5-30 MHz Screwdriver Antenna Also Avaliable in 3/8x24 Connector - the antenna is a dead (DC) short to ground. Feeding and matching is simple; it's fed with a quarter-wavelength of RG-11 or RG-59 (75 Ohm) coax, and then any length of 50 Ohm coax. 3- mm) wire in strong black plastic insulation. 2 = 32. I used to a 16- AWG (1. You can use the bamboo pole along with the usual dipole parts from the kit to build a multi band dipole antenna array suitable for NVIS propagation. ٢٩/٠١/٢٠٢١ Build your own Wire Antenna! 51 – Short Dipole Antenna for 40m – 80m – 160m 61 – Tri-band Delta Loop Antenna for 80m – 40m – 30m This marine mobile HF antenna 6-40M Alpha MOTO-FMJ system provides you with the most Rugged and Compact for EMCOMM or everyday use. Build a multiband HF antenna using multiple dipoles and single coax feed. And if all else failed, I’d have an antenna that little ratio on 20 meters. 95804 is a constant used when insulated wire is used. Shark Antennas S-FM20 Mono Band HF 20 Meter Mini Mobile Vertical Antenna with 3/8x24 One may argue that 560 feet is ridiculous for a 40 meter dipole, ٠١/٠١/٢٠١٩ I have also this problem as I only have a small balcony so I decided in trying to build extremely shortened antennas as this is common for ١٥/١٠/٢٠٢٠ Full and Shrunken 40 quad antenna, how to build a quad antenna for Band HF 20 Meter Mini Mobile Vertical Antenna with 3/8x24 Threads, I wanted high efficiency 40 Meter antenna with low-angle radiation. 9 meters wire at its end. To build a 1/4 wave 40m vertical with elevated radials using insulated wire, the formula is: 234 / operating frequency x 0. This vertical antenna has no lossy traps or coils to burn out. (• Windom(for(10(– 40(meters(shown It’s best to find resonance on any antenna, but I’ve also found that there are sweet spots that work for different other ham bands. Stock availability and shipping volume can delay shipping. Handles 1500 Watts. With my vertical antenna I can listen to 40 and 80 meters, but we all know that is not the best setup. My 40 meter vertical cost me $13. I have 30 through 10m covered with the beams and needed individual antennas for 80 and 40 which the new SPE amp could handle. The basic half wave dipole itself is quite straightforward, Seven foot single-band 40 meter HF mobile whip antenna. Figure 3 shows my 4 element quad built with old Moonraker 4 parts on a 40 foot tower. 5 feet, slight slope, 55 feet of coax, line isolator at radio. 08 inches for the longer of the two 3/8″ rod elements. E. $400. The 20 meter antenna is on the top. ProComm PCF40 - 40-Meter HF Fiberglass Ham Stick Antenna. Comparing my little low profile 40 meter mobile antenna to the antenna pictured above right, I increased my ERP by 6 DB. One for 40m and the other for 80m, forming the top 4 guy wires. measured about 100 kHz, the 40-meter at 40 kHz and the 75-meter about 20 kHz. Since the 2:1 SWR bandwidth of the antenna is wide the adjustment parameters are relatively broad and fine adjustment is not usually necessary. April 22, 2015 KK6GXG. Hustler standard resonators can handle 400 watts PEP. Eme Arrays — A Collection of EME Reflector Antennas and YAGI Arrays. 05 10. Space-wind a total of 44 turns of #12 bare copper wire onto the form and secure it with epoxy, Approximately 33 feet of wire is required. Now 80 Meters also! - The N9TAX 2 Meter Ladder Line Slim Jim Antenna Review Build a 3 band reduced space multibander 40 M HUSTLER MOBILE MATCH Build the antenna roughly to size and adjust the 6m section first below L2 . "I used Pvc at the ends and center of the antenna to keep it exactly 7 feet 0 inches. An on-the-air comparison was made between the portable whip dipoles up 20 feet and half-wave dipoles for 40 and 75 meters. This shortened easy-to-build vertical, with no-radials, is made from surplus military camouflage poles. To run a 400 watt mobile amplifier, it would create an additional current drain on the car's electrical system by 70 amps. 2 21. The goal will be to keep the total length under 40 feet so that the dipole can be mounted on two 20 foot fiberglass pole to make a 20/40 meter rotatable dipole. As long as the elements are symmetrical, they do not have to be in a straight line. 0dBi 1/2 wave. 20 to 30 foot space at 40 meters represents approximately 1/8 to 1/4 wavelength spacing. F. He commented to me that, even if a loop is only 10% efficient, that is only down 10 dB - about 1 1/2 S units. What a bad mistake that was! The butternut antenna I once own was a 5 band vertical and work really good considering I did not have any radials down, and did not have the space to put any down. #9120 20 Meter Hamstick 38 36 32 o o x 30 13 g 14. Multi-Band Antenna - NO height 40 meter gain and pattern of distributed feed has changed to this: We now have about 2. HVC14: 20m Loading Coil for HV7A & MV3A. We’ve chosen a small 40 meter 1/2 watt CW (morse code), circuit that will transmit, and receive on 7. His version is cut for 80 meters. High Performance 40 Meters Vertical . A minimum of 3 radials spaced 120 Most Mobile homes do not have an “attic” as such, but most other homes do. For more about resonant antennas, check out ARRL’s Antenna Book. Brand new parts for this antenna assembly, including the $50 speaker stand, will set you back about $250… more than a little, less than a lot. We next put up a 50 ft guyed mast to support the apex of the loop. Our motorized antennas and stainless steel mounts are designed with the most avid HAM radio operator in mind, as well as commercial applications. If your HF rig has a built-in tuner, the useable frequency span approximately doubles without significant loss of antenna efficiency. 40 Meter Antenna. 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. There is hardly a more efficient antenna for the money than a resonant dipole! With one an MFJ-17754 40/20 Meter Dipole Antennas from DX Engineering, you can work the world without putting a dent in your budget! The net of all of this analysis was that we decided to build the Horizontally Polarized version of the 40m Delta Loop. Figure 2 shows Beverage Antenna that I have installed at my backyard. Our tests show 10db gain. I am considering the Comtek 40VA 40 Meter vertical antenna, from DX Engineering, for the elements of the two element 40 Meter array. Adding inductors to your dipole makes it possible to reduce the overall length of the antenna. The 9:1 transformer provides: 1. Without Radials . Murray, KD1BL Author's Note: This article describes a 75/40 meter NVIS, but one could use the construction techniques to build just a 75 meter or a 40 meter version. The purpose of the calculator is to determine the capacitance value of the jar capacitor needed for the circuit's coil. Amateur Mobile Antennas The Shark single band antenna represent an economical solution to mobile HF operation. 7 groundplane in mobile Opek UH-405B UHF Mobile Antenna with NMO Connection Type. 40 Meter Mini Moxon Beam Antenna At W7xa. The 20/40 meter Coax Trap dipole antenna seems to work pretty good on 20 meters, on 40 meter had to use the tuner. I decided to install an 40 meter dipole in my attic space which is about 25 by 45 feet, and about 25 feet up from the ground. 3 14. a static elctricity-free antenna system (no buildup), 3. I built this antenna specially to be used on the 30 meter band. Example: 234 / 7. On 30 it still works pretty well and you’ll even make some decent regional contacts on 40 meters. Portable HF Antenna you can build in a day (A dipole antenna can be operated on its It needed to work primarily on 40 meters and I wanted to use MS-116, ٣١/١٢/٢٠١٢ This shortened easy-to-build vertical, with no-radials, is made from surplus HF Short 40 Meter Mobile HF Stick Antenna 4ft Apr 13, Thunderpole AM PRO Range | 7-7. I trimmed only two inches off each end of the 40 meter section and that was enough to get the antenna to a 1.