40 Meter Antenna Homebrew

It is made with very high quality materials and the best in its class in the market in terms of mechanical construction and electrical performance. Being the crafty maker type, I wanted to build my own antenna. Diamond ® Antennas are sold through authorized dealers. I finally got the PVC cover on the 40 meter helically-wound antenna I started back in April. I have been using the antenna without the cover as a test antenna next to the bench but it’s time to get it up on the roofline for some actual use. Below that it is not. Homepage van Maarten Ouwehand PG1N. home made collinear antenna. 09 meters above ground using a few trees in his back yard. Post #222 Having built a series of verticals, inverted vees, half squares, and loops for my amateur radio activities, I decided to "thin the heard" of my less than successful antenna efforts and concentrate on a few antennas that have given me the most contacts and overall satisfaction. Of course the tube lineup is different, but the 6AG7 would work just as well as the 6CL6 in that design. This is by far not wide enough for full size dipoles for 80 or 160 meters. I couldn't put a precise number on it, but in general, my sense of it is that 40 is still acting like 40 most of the time. Contact one of your local Diamond ® Dealers for current price & availability. 66 in total. In particular, we both were impressed with Harry’s 20 Meter Loop Antenna–it’s such a simple project and requires The antenna was never very well tuned on any specific band, but it managed pretty well on 30 and 40 meters with either built-in or external tuners in the shack. Each coil uses 11 turns for 30 meters and 23 total turns for 40 meters. A friend, WA7YLI, has similar interests. Yes, I’ve had lightning hit an antenna and yes I had to repair some damage. Under it are a fixed 6m Yagi over a 5-element Telrex 15-meter mono-band Yagi fixed on VK/ZL. I recently got my ham license and want to set up my station. 2:1 on 15, 20 and 40 meters. This antenna is perfect for HAMS that need a quick reliable solution for local 2 meter communication. diagram, an antenna rotator is required for maximum antenna gain in a specific direction. Solves Virtually Any Restricted Space Problem – For example, a 40 Meter Isotron measures only 22 inches x 16 inches x 15 inches! Easy, Quick, and Simple Installation Tunes and Performs Without Radials or Antenna Tuners Handles Up to 1000 Watts PEP (depending on mode and version. Note: As any novice knows, the 40 meter novice band has always been shared with international SW broadcast. Inspired by Budd's homebrew buddipole and AK0M's big 40M coil, I set off to fashion my own version. The 40m CW antenna seen from the north side of the tower. of the sunspot cycle, the R7000 proved to be a surprisingly good performer, especially on 40 meters. stacked folded dipole, homebrew dipole wifi antenna grid, half wave fm dipole, multiband loaded dipole calculator, vertical dipole 160m, home made 800 mhz dipole antenna, quarter wave dipole twenty meter antenna. INTRODUCTION. Of course the tube lineup is different, but the 6AG7 would work just as well as the 6CL6 in that design. But all types of antennas can be changed into the frequency you prefer. This is an OWA (Optimized wideband antenna) based on the original OWA design by NW3Z. Any reuse or redistribution of the contents of this website are strictly forbidden without authorization from MFJ Enterprises, Inc. This is accompolished via clever usage of Slide switches to adjust the length of the dipole and a shunt to allow usage of the 30 and 40 meter bands. 300 Ohm Twin Lead with the ends shorted is an option for even greater bandwidth. As a satisfied userof oneafthe original HF5V Butternut 5 band verticals I hoped that the HV2V. It has a 60 foot supported boom comprised of sections of eight inch square aluminum tower. I was able to find the tap for 30 meters very fast. The doublet is ~30ft up. 3 MHz, or the 40-meter band. I was frankly surprised that these little transmitters would do over 1. I chose the EARC end fed 6-40. 40 metres did require. In particular, we both were impressed with Harry's 20 Meter Loop Antenna-it's such a simple project and requires. The Horizontal Loop, also known as the Loop Skywire Antenna, is an old but very effective design. The antenna is calculated for a specific length, usually 1/4 wavelength. 25 wavelength vertical, depending on soil characteristics. I also looped a 12” strand of nylon cord through each torroid to support the torroid on the antenna should the clip leads come loose in the wind. In the drawing above, it is shown for just four bands, 80 thru 10. For 20 and 40 and 10 Meters, I use a PAR ENDFEDZ 10/20/40 MKII. However, almost any combination of ham sticks can be used. Build an HF Ham Radio Dipole Antenna It is easy to build, construct and erect a dipole antenna for the HF bands: 160, 80, 40, 20, 15, 10 metres, etc using a few simple components at a minimal cost and get great results. My antenna of choice for portable ops is 60′ of old #18 separated speaker wire, 30′ of haphazardly placed counterpoise of similar wire, and a homebrew L-network tuner. A Five-Element, 2-Meter Yagi for $20 element to the boom and discard the ele-ment. Dual UHF Power Meter; PETH-40-HAM. 42 - Vee-Sloper Antenna. This antenna proves no exception to that rule. Go too high and you have low zenith gain. I built mine from 10 feet (3 meters) of 1/2 inch (12. is the best I can do for 80,40 and 20 meters,and I use an Imax 2000 for 10,12,15,17 and 20 occasionally,and a Cushcraft beam for 2meters. In the drawing above, it is shown for just four bands, 80 thru 10. Full-size on 20 Meters, ultra-efficient end-loading on 40 Meters. 40 metres did require. I just ordered a Diamond Discone antenna for satellite stuff so it will probably be going on the tower soon also. I chose the EARC end fed 6-40. Each coil uses 11 turns for 30 meters and 23 total turns for 40 meters. I cannot fit in a gain antenna at this location, not even a wire yagi, and certainly not the 2-element yagi I have in storage. Making a antenna is not as simple as just sticking something up in the. we decide to make a home brew loop antenna for 10- 40 meters ( 143 feet, with 450 ohm ladder line, and a 4:1 balun in MY backyard about 20 fet up in the trees, thanks to KB0RZP AND KD0OVK for. 27 MB Horizontally Polarized Omni-Directional Antenna. Background:. For a while I used antennas for other bands with a tuner to get on 30. Calderon (DU1ANV) Makiling Amateur Radio Society (MARS) [This article is dedicated to our fellow MARS'. It is a directional antenna that provides great performance and does not require a full scale, expensive tower. That is true on 40, but on 80 meters it adds roughly about 400-ohms reactance because it is a 1/8th wave shorted stub. Many MUF indicators are between 40 and 50 MHz. In my case for the 40 meter band I will need a square area 66 feet on a side. All information, images, and documents on this website are the sole property of MFJ Enterprises, Inc. QRP portable qrp skcc contest portable qrp antenna cw DX SOTA hoa restricted antenna morse code stealth antenna elecraft kx3 ham radio kx3 magnetic loop qrp antenna JT-65 WSPR calling cq digital modes mag loop qrpp reverse beacon network ssb #proudofmyson 10 meter 2 meter portable j-pole CWOpps EI13CLAN JT-9 Wake Island camping copper j-pole. The JK401 is a simple Hi-Q coil loaded rotatable dipole, with a small footprint as well giving great performance on 40M. I’m always looking for antennas that work. 00! Wow! These guys are making some good markup! Features of the K0WA 40 meter verticle. Excellent condition - MiL- Spec and ready to hang. I wanted to make a all band antenna without the long tail of a G5RV. We will see that a vertically. HF Antennas Especially stealth models for those in an HOA •20 meters and above or 80 meters and TV antenna 20 mtr 40 mtr 80 mtr. ian, Louie/4F1AAZ, who passed away many. 20 metre delta loop HF antenna; Make a Digital SWR meter from a kit raising the overall height may further enhance antenna efficiency. On 20 meters the SuperLoop 40™ coverts itself into a 2 wavelength open loop or Bi-Square. I cannot fit in a gain antenna at this location, not even a wire yagi, and certainly not the 2-element yagi I have in storage. Inspired by Budd's homebrew buddipole and AK0M's big 40M coil, I set off to fashion my own version. Each antenna is installed and tuned to give a 1. It is designed for DXing, not for close-in work where low, horizontally polarized antennas are more appropriate. Any reuse or redistribution of the contents of this website are strictly forbidden without authorization from MFJ Enterprises, Inc. A 2-Meter Vertical Dipole Array Build this 2 or 4-Element VHF repeater antenna with up to 9. 2 Home Made HIGH POWER Magnetic Loop. The 2 Meter elements were all made. This article describes a collinear antenna made from very inexpensive RG58/U coaxial cable and encased in PVC pipe. This improves the antenna's radiation pattern and matching. So the measurements are based on a 40 meter 1/2 wave dipole. A 40' "gin pole", which 20' is above the tower was temporarily added to give us "extra head room" for rigging purposes. I do not have an antenna for 160 but do listen from time to time. 5 to 1 Balun with SO239 connector. INTRODUCTION. I currently have a 7040 crystal and the rig seems to put out just about 500mw at 7. The hexagonal beam (or known by many as the hex beam) has become a wildly popular antenna. Ham radio 40 meter homebrew ground mount vertical. 9 out of 5 stars 34. Or I could buy a antenna tuner and > a largewhip. But all types of antennas can be changed into the frequency you prefer. I looked into purchasing an antenna analyzer and like everything else with ham radio, they seemed unusually expensive. In my case for the 40 meter band I will need a square area 66 feet on a side. After installing the antenna, measure the SWR to find the resonance of the antenna and note it. Post #222 Having built a series of verticals, inverted vees, half squares, and loops for my amateur radio activities, I decided to "thin the heard" of my less than successful antenna efforts and concentrate on a few antennas that have given me the most contacts and overall satisfaction. Experience has shown that most external tuners and many internal tuners will tune 80-6 meters with an antenna length of 22' to 39. As typically installed, it is a compromise antenna but great for portable use because it is easy to pack and easy to install. Started on February 2012, I tried a few time to build it but failed, SWR very high. The doublet is ~30ft up. I had established a 40 meter dipole and was happy with the results. Go to the remaining wire on the 58-inch element; its opposite end at-. I built my first homebrew 160 meter transmitter in 1959 with parts from a discarded TV set. I usually give myself an extra foot on each leg nowadays. Free Online Engineering Calculator to find the Dimensions of a yagi Uda Antenna for a given Frequency Range and Length. A vertical seemed the obvious answer, a naturally low-angle radiator. ian, Louie/4F1AAZ, who passed away many. I opted to test a commercially built antenna, rather than build my own, because I wanted to rule out any negative factor which I might accidently inject into a home-brew antenna. Stack Exchange network consists of 175 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers. Homebrew buddipole: https://docs. Must do mobile as HOA rules. 40 meter amateur bands using a good tuner without modifications for the Ohio State Parks On The Air contest. That is true on 40, but on 80 meters it adds roughly about 400-ohms reactance because it is a 1/8th wave shorted stub. Home Brew the Blockbuster. Then the antenna mast I installed as a replacement fell down in a snow storm. Big wire, small wire, solid wire, stranded wire, copper wire or steel wire there are a bunch of choices. Any insight. Started by taking the 2 baluns apart to see what they were made of. In retrospect this is understandable. Shark 5 Pack Mini HF Single Band Mobile Ham Radio Antennas 10 15 20 40 75 Meter. Schematic fig1. It was a 40 meter Carolina windom. F/B ratio is consistently 5-6 S points on my TS850 S meter, on all bands 20-10m. With a power rated at 500 watts (P. Also Great For Limited Spaces. 21 meters antenna "stinger" from an old mobile antenna. From the ARRL Antenna Book: Practical Suggestions For Vertical Ground Systems At least 16 radials should be used if at all possible. Build an HF Ham Radio Dipole Antenna It is easy to build, construct and erect a dipole antenna for the HF bands: 160, 80, 40, 20, 15, 10 metres, etc using a few simple components at a minimal cost and get great results. But again, I have > a hard time spending 300 bucks for a mobile antenna. I chose 58' for Mid 80 Meter Operation. 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. The 40 meter antenna leg on each side must be on the top of the 20 meter antenna leg. The higher gain antennas have a lower vertical beamwidth. 40 Meter 30 Ft. com/viewer?a=v&pid=sites&srcid=ZGVmYXVsdGRvbWFpbnx3M2ZmaG9tZXBhZ2V8Z3g6NGViNDIyYTE2YjA3YjNh. Vertical - Home Brew Antenna-+ Dailymotion. Each antenna is installed and tuned to give a 1. 1:1 SWR at the antenna connector of each Vertical. 1 MHz, it is between the 40 and 20 meter bands. Total Wire Optimum Number Optimum Length Peak Gain. The 40 Meter Isotron Antenna. ost commercial 2-meter repeater antennas with gain fall into two categories: collinear arrays and stacked element arrays, with gains ranging from 3 to 9 dB1. Inspired by Budd's homebrew buddipole and AK0M's big 40M coil, I set off to fashion my own version. Modeling this 160 meter inverted-L in EZNEC shows surprisingly useful patterns and gain on most HF bands above 160. MFJ Enterprises Original MFJ-1778M G5RV Junior Wire Antenna 40-10 Meters, 52 Ft Long. This antenna is up at 140'. Most of the verticals presented in this section, especially the ones built on Spiderbeam fiberglass poles, have been field and contest proven by tens of amateurs. com for more details of this homebrew idea. TUNES ALMOST ANY ANTENNA YOU CONNECT IT TO ! Recently after building my SW-30+ from Small Wonder Labs, I found out that the little BLT tuner I had been using for my QRP operations would not tune my 40 meter Extended Double Zepp (178' centerfed with 450 ohm balanced line) on 30 meters. QRP portable qrp skcc contest portable qrp antenna cw DX SOTA hoa restricted antenna morse code stealth antenna elecraft kx3 ham radio kx3 magnetic loop qrp antenna JT-65 WSPR calling cq digital modes mag loop qrpp reverse beacon network ssb #proudofmyson 10 meter 2 meter portable j-pole CWOpps EI13CLAN JT-9 Wake Island camping copper j-pole. It is meant to be light and easily. 40 meter Delta Loop Joe on 21st Oct 2016 I recently purchase a 40 meter Delta Loop from Chris and received the antenna few days later after the purchase, I hung up the antenna in less than one hour in configuration, C , I hook up my antenna analyzer after the installation and I was Very surprise is flat 1:1 on the entire 40 meter band, 20 meter was about 1:2 on the top edge of the band and the. Louis Vertical-- By Dave Gauding, NF0R. build wifi collinear antenna. When I used the antenna a choke balun of type W1JR which was attached direct to the connector of the antenna. 75 which equals 105 feet. 6 feet long and by using an antenna tuner am able to run that dipole on bands like 75M, 60M and 40M. 11 METER CB ANTENNAS. I like to use a home made current choke to keep RF from coming back on the feedline. Here's where the (Black Box) comes into play. I chose the EARC end fed 6-40. we decide to make a home brew loop antenna for 10- 40 meters ( 143 feet, with 450 ohm ladder line, and a 4:1 balun in MY backyard about 20 fet up in the trees, thanks to KB0RZP AND KD0OVK for. The doublet is ~30ft up. When I upgraded to General Class in October 1959 I added a WRL 755 VFO and a WRL SM-90 screen modulator. 1/2 wave antenna principle. Therefore this chapter describes a simple QRP design I have settled on. I have spent most of my creative antenna energy on 40 meter wires and have had great success with those experiments. From there, a seperate feedline goes to each of the Driven Element feedpoints. Performance-I have no accurate method to measure forward gain, but I reckon it is the text book 6-7 db. Updated 18-Oct-2006 22:33 [back to W1TR Antennas and QTH] [back to W1TR Home] The 40 meter horizontal loop is constructed from #10 stranded insulated wire available in most hardware stores. Making a antenna is not as simple as just sticking something up in the. This antenna is up at 140'. The metal whip would serve as a "top hat" for the helix. In the drawing above, it is shown for just four bands, 80 thru 10. This antenna is 58 ft tall and is mounted on a hinged base. For years I've thrown together simple antenna tuners to get me on the air when needed. Efficient Portable Ground Mounted Vertical Antenna for 40 Meters August 20, 2015 September 1, 2015 raycharlesring RF I like to work QRP CW and exclusively use home brew portable equipment. And, the impedance and reactance are perfect! Below is a quarter wave ground plane antenna I made for 23cm, 1296MHz which is made from off-cuts of household mains copper wire and a scrap BNC socket from the junk box. The 40 meter antenna leg on each side must be on the top of the 20 meter antenna leg. I came up with an antenna that extended only 1. I am providing this page because the dipole antenna is often overlooked nowadays as an effective means to getting on the air. I then began trimming the 80 meter elements. The sloper's feed point is anchored high above ground near the top of the tower on which sits a grounded HF yagi beam antenna. This antenna is very stiff and not quickly or easily deployed. I don't know how many dbs per. Radial systems can be very large especially for the lower ham bands. High Performance 40 Meters Vertical. EggBeater Antenna - VHF/UHF From K5OE Eme Arrays — A Collection of EME Reflector Antennas and YAGI Arrays. These are closed loops that are one full wavelength long. The hexagonal beam (or known by many as the hex beam) has become a wildly popular antenna. Richard Lau) at Nibong Tebal, South of Seberang Perai, Penang. In my own house, the paper shredder, microwave oven, furnace ignition system, eliptical exercise machine, dvd player, and other assorted appliances can cause quite a bit of momentary noise that is picked up by my main transmitting wire antenna for the 160 - 40 meter bands. The JK402 is a short boom 2 element 40m Yagi that has excellent gain and F/R. The element material came from the tops of W7CY's old 80M 4 square that was built on top of Hy-Towers, thanks Rod! On top of Rod's pieces are elements taken from a KLM 5 EL 20M beam in my pile. See more ideas about Ham radio antenna, Ham radio and Ham. In retrospect this is understandable. All information, images, and documents on this website are the sole property of MFJ Enterprises, Inc. Yes, I've had lightning hit an antenna and yes I had to repair some damage. 180=140 feet (see chart below). It was mighty tough coming up with a taper schedule for a full size 40 meter beam with the parts I had on hand. 66 in total. I built an experimental antenna similar to the TAK-tenna spiral antenna and was evaluated for SWR response over the frequency range of 7. After mounting the TRAP's to 160 meter, the 80 meter band had a little change. The performance of the antenna, through the model, will be explored in several typical settings. HOME BREW 11 METER LOOP ANTENNA. The measurements below are for building a Double Bazooka Near Vertical Incident Skywave (NVIS) Antenna. Homebrew Hex Wire Beam Antenna I put together a homebrew wire beam based on the "hex" style. They can be highly effective as well as portable. Homebrew is an important aspect of Many people also build their own antennas and the knowledge that can be gained through antenna modelling software and the trial. HORIZONTAL LOOP ANTENNA CONSTRUCTION. 88) should also work well. With a 6:1 Balun transformer is possible to feed easily by using a coaxial cable of 50 Ohms (300/6=50), like BROAD-PRO 50 (www. It was a 40 meter Carolina windom. USING THE VELOCITY FACTOR OF COAX TO DECREASE SIZE OF ANTENNA. BUILD A 2 METER YAGI AND 6 METER. Whenever I would go to a sidewalk sale or hamfest I would pick up any components that might someday come in handy to make an antenna tuner. Comparing antennas is very difficult , sometimes I have heard 60 % better signals in RX and TX on the loops then on the dipole. Making a antenna is not as simple as just sticking something up in the. After asking a million questions in my antenna tuner thread, and looking at at vertical antennas a rather lot this week and last. Great antenna and a keeper Restricted space spoiling your operating fun? MFJ Cobweb puts your call. I decided it was time to set up a 2 Meter base station. It is a directional antenna that provides great performance and does not require a full scale, expensive tower. I just ordered a Diamond Discone antenna for satellite stuff so it will probably be going on the tower soon also. A few days ago, SWLing Post contributor, Robert Gulley (AK3Q), pointed me to an excellent website by Harry Lythall (SM0VPO) which is chock-full of various homebrew radio projects. The diagram above depicts the 17 and 20 meter delta loops setup at my QTH. 20M vertical. A few months ago I bought a FT140-43 toroid to make myself a homebrew End Fed wire antenna,without the need for a tuner. 1) The magnetic loop antenna is an RF transformer. However, the J-pole's highly visible profile may be objection-able to some neighbors. 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. Experimental measurements and calculations show that with this number, the loss resistance decreases the antenna efficiency by 30% to 50% for a 0. It was mighty tough coming up with a taper schedule for a full size 40 meter beam with the parts I had on hand. I guess I had one. Twenty-five feet/7. Home Brew 80/40. HF Antennas Especially stealth models for those in an HOA •20 meters and above or 80 meters and TV antenna 20 mtr 40 mtr 80 mtr. The transverter requires 2 watts of drive from a 40 meter cw transceiver and outputs 2 watts on 6 meters. A full wave loop, compressed in dimensions has much less than 1 dBd gain. Not the best in the world, but it'd work. This is a popular antenna design as the performance is very good across the HF bands and requires little or no tuning. 68 meters of enamel wire wound tightly on a 20 mm form. Use a screwdriver and pliers to re-lease one wire from beneath one of the rivets on the 58-inch element. Chapter 6 BUILDING A HOMEBREW QRP Among the guys I work, QRPs seem to be the most common homebrew project, second only to building antennas. 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. So on a 40 meter vertical you can have a few radials that are 34 feet (ideal 1/4 wave at 7. And, the impedance and reactance are perfect! Below is a quarter wave ground plane antenna I made for 23cm, 1296MHz which is made from off-cuts of household mains copper wire and a scrap BNC socket from the junk box. 40 meters is roughly ten times that of the antenna’s base (feed-point) impedance and therefore has a negligible effect on match-ing. 1) A W8JK of 10 meters scale : It consists of 4 rods from 16. Loop antennas have always fascinated me. This antenna is made for the DX'er that ís looking for an antenna to work across the globe. 40 meter band antennas projects is a curation of 206 resources about , The 40M Extended Double Zepp, Shrunken 40 Meter Phased Quads, 40 m Lazy H array Antenna, 40 m Wire 4 Square Vertical Array, G5RV Beam. The metal whip would serve as a "top hat" for the helix. Works great and gives several extra bands besides the 80/40/20/10 meters using Kenwood with. The World Ranger Dipole gives bi-directional patterns and rotatable convenience. 10 meters per side. Meine Magnetic-Loop mit zwei Windungen für 80 und 40 Meter - QRP magnetic loop by KR1ST; PA3CQR Magnetic loop antenna page - Portable HF Transmitting Loop Antenna - Practical Experiments with Magnetic Loop Antennas - Small loop antennas (magnetic loops) - Stealth ST-940B Mobile HF NVIS Magnetic Loop Antenna - The G3BGR Magnetic Loop - THE. Antennas: W5GI "Mystery" Antenna all-band dipole @ 33' S9 vertical (80-6 meters) 2 Homebrew Delta Loops 10 & 6 meters @ 15' Homebrew Fan Dipole (40-6 meters) @ 30' Homebrew (converted TV ant) 10-2 meters Homebrew J-Pole - 2 meters: Computer: Unbutu Linux OS KLOG Logging Software CALLGIT - Call Sign Lookup FLDIGI - digital radio Airmail - PACKET. QRP TRANSMITTER - Michigan Mighty Mite! This is my first homebrew hf rig. 00! Wow! These guys are making some good markup! Features of the K0WA 40 meter verticle. As a result, we often turn to vertical antennas for our DX solution. • To be a magnetic loop, the loop circumfrence MY 40 meter loop. You are looking at a very talented homebrew skyloop HF ham radio antenna called the AG6IF Talented Balun and LoopIt consists of: 16g 128 feet of insulated wire with split ring terminals on the ends. I currently have a 7040 crystal and the rig seems to put out just about 500mw at 7. Many RASON members truly enjoyed last month's collinear antenna. Surprizing that they did not make it also include the 80 meter band, but back then, I think 40 was the hot band of choice for most novices. 0 MHz) and 40 meters (7. 6-40 Meter MOTO-FMJ HF Mobile EMCOMM Antenna. OK,back to the. This started out being a stelth antenna for a friend. The JK402 is a short boom 2 element 40m Yagi that has excellent gain and F/R. It actually is resonant on the 40 - 10 Meter Ham bands. Homebrew Heaven, kits too! Dan's Small Parts and Kits is now offering the new: Centennial 80 Meter SSB Kit. ost commercial 2-meter repeater antennas with gain fall into two categories: collinear arrays and stacked element arrays, with gains ranging from 3 to 9 dB1. Any reuse or redistribution of the contents of this website are strictly forbidden without authorization from MFJ Enterprises, Inc. We strung it in the trees of the campsite, fed-end high with a 60 foot RG58 feed, 45 degree of slope with 35 feet of wire. The antenna boom is made of the same material: 2 sections of 135 cm (4 ft 5") in length (cut from a standard 3 m section). Magnetic Loop Antennas for The Radio Operator with Limited Space pt. In part one of this series, I covered the use of one brand of commercially available, small transmitting loop antennas, also known as ‘magnetic loops’. Because my antenna is closer to 1/8 wavelength rather than 1/4 wave typically used for vertical radiators I have already compromised some efficiency so I feel a good radial system is essential. This is accompolished via clever usage of Slide switches to adjust the length of the dipole and a shunt to allow usage of the 30 and 40 meter bands. Then he had RG-58 coax running from the balun to the shack. I love that length. I chose the EARC end fed 6-40. Experience has shown that most external tuners and many internal tuners will tune 80-6 meters with an antenna length of 22' to 39. High Performance 40 Meter Transmitting Antennas High horizontally polarized dipole at least 70-100 feet high easily provides 6 dB of ground gain - for free! 4-Square array of phased 33 foot verticals with 30-60 radials. And all at little cost. The World Ranger Dipole gives bi-directional patterns and rotatable convenience. A few days ago, SWLing Post contributor, Robert Gulley (AK3Q), pointed me to an excellent website by Harry Lythall (SM0VPO) which is chock-full of various homebrew radio projects. Having purchased an all-mode, all-band (160m - 70cm) transceiver, I became curious about what 2-meter weak signal operations have to offer. A wonderful first antenna is a coax-fed 40 meter inverted vee. This is the perfect antenna for a 6 meter repeater project or high performance base station installations. The antenna is not symmetrical and there is no advantage to trying to shorten or lengthen both diagonal legs. Today was a good antenna day. • 40 Meters – No significant difference in gain or pattern – Slightly less SWR bandwidth • 80 Meters – No significant difference in pattern – Gain about 0. 2 Home Made HIGH POWER Magnetic Loop. The built in tuner in the KX3 handles whatever tuning may be needed. I must mention that this noise problem only affects 40, 80 and 160 meter bands. On the other hand it also means that the antenna acts somewhat as a pre selector which might just prevent your receiver front end from overloading because of strong (broadcast) stations. So what I've tried doing is using my 20 meter loop antenna as a receiving antenna for 75 meters. 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. Do you want to remove all your recent searches? All recent searches will be deleted. The article is geared towards people new to antenna building, so it may seem redundant or lengthy to old. The capacitor between the antenna and radial junction is replaced with a tapped coil. I use my QRPs as stand-alone transmitters or I use them to drive a final amplifier to produce higher power, 25 to 100 watts. com FREE DELIVERY possible on eligible purchases. Solves Virtually Any Restricted Space Problem – For example, a 40 Meter Isotron measures only 22 inches x 16 inches x 15 inches! Easy, Quick, and Simple Installation Tunes and Performs Without Radials or Antenna Tuners Handles Up to 1000 Watts PEP (depending on mode and version. My 40 meter vertical cost me $13. THIS PAGE IS ABOUT HOMEBREW ANTENNAS: Antenna Basics -- Excellent Tutorial From Scott's Pages Antenna Theory 101 -- Excellent Tutorial From KD4SAI Antennas from QRZ Shareware -- over 40 antenna files ARRL Antenna Projects Loaded With Many Antenna Projects AA3PX Antenna Page -- Conversations with Dr. With any vertical antenna, a good ground system if a requirement. Measuring on antenna after mounting the TRAP's. One big consideration was weight, 4 cage dipoles for 40/30/20/10 uses almost 1,000 feet of wire. For You Explore. The Antenna Is Resonant On The 15 Meter Band But Requires A Tuner On Other Bands. NVI 40 Meter Antenna Modeling. Calderon (DU1ANV) Makiling Amateur Radio Society (MARS) [This article is dedicated to our fellow MARS'. With the sunspot plunge, a goodsignalonthelowbandwill beamust during the next few years. Electromagne2c' Wave'Polariza2on' • Electric'and'magne2c'waves'are'at' right'angles'to'each'other' • Magne2c'wave'dissipates'within'a' few'wavelengths'of'antenna. It has a 60 foot supported boom comprised of sections of eight inch square aluminum tower. Experience has shown that most external tuners and many internal tuners will tune 80-6 meters with an antenna length of 22' to 39. After a few talked he gave us an article about vertical antenna that he took from the internet. Compare the gain-bandwidth of this antenna to the rather narrow gain-bandwidth of the 8 element yagi above. More of 40 meter horizontal loop. Experimental measurements and calculations show that with this number, the loss resistance decreases the antenna efficiency by 30% to 50% for a 0. CO LINEAR ANTENNA DESIGN While it is not possible to home-brew a commercial quality antenna, it is very feasible to build a collinear antenna for average use. Works great and gives several extra bands besides the 80/40/20/10 meters using Kenwood with. Antenna performance and 2:1 VSWR bandwidth is site dependent and varies with height above ground and surrounding objects. Although this design has been around for a long time, it is only gaining popularity now due to the recent improvement in high power antenna tuners. If you ever do plan to put up a second tower you might want to consider placing it to allow for the possibility of low band wire yagis, and not just for 40 meters. Most of the verticals presented in this section, especially the ones built on Spiderbeam fiberglass poles, have been field and contest proven by tens of amateurs. Comparing antennas is very difficult , sometimes I have heard 60 % better signals in RX and TX on the loops then on the dipole.   As you can see, the pattern and gain are extremely close – our gain is down. What a bad mistake that was! The butternut antenna I once own was a 5 band vertical. Each American made antenna covers a single HF band with a power rating of 250 watts P. I just ordered a Diamond Discone antenna for satellite stuff so it will probably be going on the tower soon also. Apparently, the homebrew EH antenna works for him. FYI -- This was (many years ago) for a science fair I entered. His version is cut for 80 meters. As a result, we often turn to vertical antennas for our DX solution.