Magnetic loop antenna in attic So if my large loop is 5 feet diameter x 1/5 = 1 foot diameter of small loop; Larger main loop for lower frequency. Would the MFJ (or other) magnetic loop antenna be better? Is there a better option? A popular way to match the antenna is with a small 1/5 diameter loop (eight inches of RG8X in this case). It's rated to handle 100W on SSB and 25W for CW and digital. If your building is wood framed, then a wire antenna strung up along the ceiling is probably a better option than a magloop. Part Number A Portable Multi-Band Magnetic Loop Antenna Described here is a simple multi-band magnetic loop antenna designed for 20, 30 and 40 metres, but by changing the overall length of the wire coverage of other bands is feasible VK5BR 20-40 Metre EH Antennas How to construct a very small but efficient Antenna with PVC Plumbing tube and discarded fruit Small loop is 1/5 the size of the large loop. If you do a web search for “indoor amateur radio antennas,” you’ll get many more ideas. 5dBd, and UHF = 7. There is a loop antennas Yahoo group, and we do have a loop antennas wiki, but for the most part, it concentrates on commercial units and although some cover HF, most cover the MW band. MAGNETIC LOOP FOR 80m - 40m EVOLUTION OF A PROJECT December 2002: Two turn CELLFLEX 1/2"-CABLE-LOOP for 80m - 40m, Diameter 1. 1m, Capacitor 150pF max. . I found the loop to be an effective antenna when operated horizontally 6. Yes, use a cookie tin and place it by the window. This is the cheapest way to buy cable: it cost me $10, the guy ropes a further $10. A small but efficacious HF antenna Hi. The downside is the somewhat less efficient radiation and the very narrow bandwidth. So, I had the ipad facing my monitor, me looking at my phone in the attic, while rotating the loop for the A key characteristic of magnetic loop antennas is the very narrow bandwidth when tuned, so that if you QSY a few kHz you need to retune the loop. The operator asked abou Perhaps try the loop in the attic with a cheap TV rotator, and sneak an end-fed outside? If you're completely stuck on keeping the antenna inside, a fan dipole will probably be your best bet. So I want to improve this attic antenna. Magnetic loop antennas will typically have a radiation resistance in the order of 100 to 200 milliohms. The ultimate AM loop antenna article. 5 meters wide and 2. 5 MHz, LA6NCA, Larvik, Norway GAP Titan DX performance Using A Mag Loop in the Field zFor Small Loops, Use Cheap Photo Tripod zFor Larger Loops, Purpose-Built Mast zNon-Conductive Mast Better, MUST be Insulated from Loop zElevate 1 Loop Diameter zNo Advantage to Higher Loop Height zKeep Away from Large Metal Objects like Cars, UFOs, T-72 Tanks, etc The loop is rigid enough to maintain its shape but flexible for portable transport or attic installation. The MFJ looks like a toy Magnetic loop antennas of 1 to 3 meter diameters have been used successfully even they are about 40 to 60 percent efficient. These specialized antennas can be as small as 2-3 feet in diameter yet still deliver excellent reception. It works really well in attic installations or your backyard in HOA restricted areas. com Unfortunately due to HOA regs I had to put mine in the attic. The objective of this article is to disseminate some practical hidden in an attic / roof loft, an outdoor porch, patio balcony of a high-rise apartment, rooftop, or any other space constrained site. One of K8NDS’ helically-wound magnetic loops. VE3SO, who I’ve worked several times, uses a magnetic loop antenna installed in his garage. Magnetic Loop Antenna: The Space-Saving Performer. Every installation has its own issues, of course, but in my case, noise from all the wiring in the attic started to be an issue around 3 Mhz and down. It will handle 100 watts and is remotely controlled in the shack via motorized DX Engineering RF-PRO-1B Active Magnetic Loop Antennas are designed for low-noise reception of signals within the frequency range of 100-kHz to 30-MHz. One end of the coax is soldered to the center and shell of the SO239 connector in the usual manner, but the other end has the braid not connected with the center coax wire soldered to the outside shell making a DC short. 73 Mike where: B is the RMS value of the magnetic induction, in tesla (T ≡ V·s/m²); µ 0 is the permeability of vacuum, constant of 4π10-7 H/m; µ r is the relative permeability, dimensionless quantity. Building and testing small transmitting loops, also known as magnetic loop antennas, for the amateur HF bands. A couple of months ago, a guy I worked on 40m told me about the loop antennas designed by Rich, K8NDS. www. It was a substantial piece We are with Rod, K8RR and Ed, K8IV from DX Engineering to talk about the Ciro Mazzoni Automatic Magnetic Loop Antennas. The Alpha Loop is: More EFFECTIVE at getting your signal across on 10 to 40 meters using 100 watts PEP SSB = You Will Be Heard!; More EFFICIENT on 40-80 meters using an outer loop that is over 21+ feet providing the most skin An Attic Coaxial-Cable trap dipole for 10, 15, 20, 30, 40, and 80 meters W5GI Mystery Antenna Car mount magnetic loop antenna plans from 3. Prior to the loop, he operated full-length wire antennas (40m-10m), including dipoles, doublets, loops with remote tuner (albeit <30' above roof line at most). Free Shipping - DX Engineering RF-PRO-1B® Active Magnetic Loop Antennas with qualifying orders of $99. Detail of coupling loop and experimental capacitor (theoretically 128 pF/3. Larger loops of 30 to 50 feet circumference can be used multiband operation with 60 to 80 percent Hello OperatorsA former colleague and good friend in Ukraine, asked about a stealth antenna, and how it might work for his situation. Shop HF Receive Antennas at DX Engineering. 0-meter diameter shielded loop with a high dynamic range preamp may do better than an attic mounted antenna. This is an antenna you might consider if you have limited space, by Lloyd Butler VK5BR Based on material originally published in Amateur Radio, 11 1991 Dave KC3AM . In this case we recommend QRP operations due Attic AMSAT Antenna – Working the Ham Radio Satellites With A Rotatable Computer Controlled Yagi Attic Antenna; The MFJ-1786 Magnetic Loop Antenna works surprisingly well, even when only 8′ off the ground like the current location I have here in Maryland. Crane CCRadio 2E Taiwanese man faces charges for broadcasting uncensored news to listeners in China → Magnetic loop antennas are becoming increasingly popular with hams, particularly in neighborhoods with restrictions on outside antennas. The smallest and most popular selling loop-antenna. I want to see how well they will do indoors. Plug - You might just want to bring out In this video, we see how a magnetic loop antenna (in this case a Chameleon F-Loop) can be mounted in an attic to allow communications without drawing unwanted attention A magnetic loop antenna can very conveniently fit on a table top, in an attic / roof loft, an outdoor porch, patio balcony of a high-rise apartment, or any other space constrained site or antenna Magnetic loop antennas of 1 to 3 meter diameters have been used successfully even they are about 40 to 60 percent efficient. The attic is about 25 feet above the ground. where they are very popular. After researching various magnetic loops, I opted to go the route of the Alpha Antenna. Tuning the antenna can take a little time because the tuning knob for Phase three was putting up a second loop; a dedicated 80m antenna. This magnetic loop antenna covers the HF band from 10-30 Mhz. The objective of this article is to disseminate some practical information about Up at the loop in the attic, a similar version, the MFJ 918 which has two wires coming out at one end makes it ideal for use up there. 7. Mounted on a tripod on my back patio, heard many stations. The advantages [] A magnetic loop antenna can very conveniently fit on a table top, in an attic / roof loft, an outdoor porch, patio balcony of a high-rise apartment, or any other space constrained site or antenna restricted community. Start enjoying the many advantages of the magnetic loop antenna today. Quite The loop is rigid enough to maintain its shape but flexible for portable transport or attic installation. 1) A choke balun in the feeder cable prevents RF from flowing down the outer surface of the co-ax screen. In the most generic terms, it appears a horizontal mounting of a magnetic loop should produce a general omnidirectional antenna, and a vertical mounting of a magnetic loop should produce a directional antenna. As others have said, they aren’t great efficiency wise, but Magnetic loop antenna for 10-30 MHZ, 3. I am studying the very basics of magnetic loop antennas, I do not have one. We’ve published positive reviews of this antenna in the past. A "magnetic loop" antenna, so named because it responds primarily to the magnetic rather than electrical HG3 Mag Loop Antennas. Low Purchase Cost; Easy Installation; 100kHz – 30MHz frequency; Plastic + Metal Frame; Rainproof; The MLA-30 loop antenna is a good purchase for those looking for affordability with quality for a low price. HF Copper Loop A small transmitting loop antenna for 14MHz and 21MHz. Diameter is only 1m (ca. On Fri, 29 Dec 2023 23:06:37 +0000, "W0LEV" <davearea51a@> wrote: > A 0. Even a 2 or 2. First, thanks to Thomas for the information on my amplified receive-only magnetic loop antenna. I prefer to Over a period of several months prior to the completion of my attic antenna suite I operated with a borrowed AEA Isoloop antenna. 5-10 MHZ, description, construction details, homemade. 5 or 1. I actually have the MLA-30 cheapo Chinese magnetic loop so I already have one of those types of antennas. They range The G4ILO Wonder Loop is an inexpensive, easy to make magnetic loop antenna that covers five HF bands, 40m through 15m. I'm restricted to putting antennas in my attic which is 50 feet long and peaks at about 8 feet. Use a larger loop. and an antenna IN the attic will not change that. About 1. I am familiar with loop tuning. Larger loops of 30 to 50 feet circumference can be used multiband operation with 60 to 80 percent Attic mounted antennas are a great solution for amateur radio operators looking for an effective VHF/UHF antenna system installed in a limited or restrictive situation. I have recently moved into a new house and I’m looking at putting an antenna up in the loft/attic. A top keyword to search is "small transmitting loop" if you're specifically looking for a transmitting loop. Post navigation ← A detailed comparison and review of the C. By switching between the Wonder Loop and my MFJ magnetic loop in my attic (which itself performs very similar to my attic dipole) I A few random comments on the Carpet Loop. TLDR: The G90 is awesome. 5 metre square loop should be noticeably more efficient than the 1. I am trying to learn about proper location and mounting. It employs a proven, accurate and repeatable stepper motor So having an antenna in the attic, tuning it with the G90 somewhere else in the house, is not ideal, especially since the G90 maxes out at 20W. Earlier this year I saw a very impressive magnetic loop design being used by a fellow radio club member, Henrik VK2HHS. 5M tall including the tripod. Most commercial A magnetic loop antenna is a compact, loop-shaped antenna primarily used for receiving and transmitting signals in the high-frequency (HF) and very high-frequency (VHF) ranges. I’ve built mag loops like this for my attic and had great success with FT8 and JS8Call. The principal radio being used on this antenna is a vintage Hallicrafters with a high impedance balanced input. Easy to follow instructions included. There are The HG3 Stepper tuned Magnetic Loop Antenna delivers unprecedented capability, performance and convenience. W6LVP Magnetic Loop Antenna Experimenter’s Kit W6LVP Amplified Receive-Only Magnetic Loop Antenna - With Power Review Summary For : ICOM AL-705 Magnetic Loop Antenna; Reviews: 13 MSRP: 299; Description: I had always used a dipole in the attic with 100W. gxzgw pxdl efvepur fjyfks uvovg zssckcv ayhme dcmo ykpcq cjtywf xzf gwhivj ltas vgyck zcp