Magnetic Loop Magnetic Loop Antenna Project The small magnetic loop antenna is a compact efficient antenna that is ideal for portable operation or limited spaces and can be improvised inexpensively. Since its radiation resistance is low and circulating current large, the loop must be constructed of a low resistance large outer diameter conductor for best efficiency. Typically, magnetic loop antennas can be built from coaxial cable, hardline, or solid copper or aluminum tubing or ribbon. These loops also have a very narrow bandwidth, requiring a variable capacitor for tuning to the operating frequency. As voltages on the order of thousands of volts develop across the capacitor, air variables or vacuum variable capacitors are used. To maintain the lowest series circuit resistance, the connections are preferably soldered and a split-stator or “butterfly” capacitor is preferred. Most of the parts required to build the antenna are inexpensive and easy to find and a typical construction is described in this photo album and handout from our January presentation.
Connecting an FM/AM antenna AVR
If you ordered any other accessories then they will also be included. The AM antenna has quite a bit more to it. If you ordered any additional cable then this would also be included. Setup Setting up the radio is just as easy as setting up the clock radio on your night stand.
I tried an AM loop antenna from a Teak AG receiver and also tried a tunable AM ring antenna from Radio Shack that works on a Panasonic mini-receiver. Neither work with the TX receiver. All I get is static with no AM reception at all, even if I tune the RS ring antenna.
How to build a tuned loop antenna Tuned loop antenna The Loop antenna How can you vastly improve your Medium Wave reception? This graphic of the tuned loop antenna is slightly different from the one described here in the building instructions, in that it has a central leg on which to stand, this is only a cosmetic feature and is not necessary to the better reception of a radio signal. The results of these amazing antennas really and truly has to be heard to be believed.
So how do I build one? I hear you ask impatiently. I’ll keep you in suspense for a few minutes, firstly I’ll explain a little of the background of the tuned loop antenna.
AM/FM Tuner on RCA Receiver [Archive]
You can get the channel frequencies off the FCC website. Then I make one for them. Try not to OD on Seinfeld! J Lou 1 meter equals Just remove the insulation and straighten it out. I would put all wires, bow ties and the running wires, under the washers as you see in the photographs.
Dec 03, · Radio Shack AM FM Indoor Antenna Model Overview And Installation. Please Click The Link Below For The Owner’s Manual Hosted On My Website. Link To Ow.
If you have any questions, comments or suggestions, please don’t hesitate to contact me at: This is especially apparent on weaker DX stations. The whip on your shortwave receiver used to be sufficient to pull in some good DX, but now you find yourself looking for something better. Maybe you have been thinking, or even have already tried, putting up a wire antenna. Perhaps you live in an apartment or are situated where installing a wire antenna is simply not feasible.
Consider the small single turn magnetic loop antenna if any of the above situations apply to you. A second loop, which is one fifth of the diameter of the large loop, is connected to the feedline and this small loop is positioned in the large loop on the opposite side of the tuning capacitor. The loop I describe here looks like a circle in the vertical plane and is just a little over 3 feet 1 meter in diameter. You can either aim rotate the antenna for maximum signal strength, or for minimum noise pickup.
This antenna has what is called a deep null on each side of the antenna, the broad sides, meaning that signals coming from that direction will be attenuated quite a bit 30 dB is an often-quoted figure.
How to build a tuned loop antenna
It is designed for portability, and can be assembled or disassembled in about a minute. When disassembled the antenna easily fits in a suitcase or backpack. The Wonder Loop is the perfect antenna for picnic table or hotel room operation, or for home station use where outside antennas are not permitted and attic antennas not possible.
Apr 20, · A Dynamite Antenna for an AM Radio. By RangerJ in Technology Electronics. 93, 5. I rigged up one of these antennas, making a loop under the glass counter top. The difference was remarkable; all we had to do was hold the radio near the counter and signals would jump out of the speaker. I’ve used a tunable loop antenna.
Thicker wire provides better reception and is more suitable for transmitting if you have a license but it is heavier. The antenna I’ve demonstrated at recent events uses 1mm thick wire. Smaller insulators are better as they are lighter and less expensive. You may want to buy more than one balun, for example, a 4: Make sure it is waterproof, has hooks for attaching a string or rope and an SO socket. The cable must be 50 ohm.
There are even lighter and cheaper alternatives if you only need to receive. A spare USB mobile phone charge plug may be suitable. A ligher and cheaper string is better for portable use while a stronger and weather-resistent rope is better for a fixed installation.
How to Make an AM Radio Antenna
There is also a wealth of technical information on active loop antennas on his pages. His amplifier kit is an excellent value and has worked out very well for me. I have followed the loop construction guidance on the site.
MTM Scientific, Inc Pickup Loop for AM Loop Antenna. The AM Loop Antenna sold by MTM Scientific, Inc is designed to be used with a portable AM radio. The coupling from the antenna to the radio is through the ferrite loop antenna inside most portable AM radios.
Antennas Home-made antennas can greatly improve the performance of AM and FM radios, short-wave receivers, and scanners. If you are a talk-radio fan then experiment with the AM band antennas and you will be able to hear shows from all over the country with surprising clarity. Short-wave receivers are always coping with weak signals and they must have a good antenna to perform adequately.
Scanners can pick up local police and two-way radio with the little telescoping antenna provided but with good antennas a scanner becomes an amazing ear on the world nearby. No pre-amp, filter or other receiver refinement offers anywhere near the level of performance improvement t that a well-designed antenna offers. The results can be quite satisfying, leaving no doubt that the project was well worth the effort.
Active MHz Hula-Loop Antenna for Shortwave In the past, designs that incorporated an amplifier in the antenna were called “antennafiers” so perhaps this is a “loopifier”. The differential amplifier solves matching issues and the varactor tuning gives excellent out-of-band rejection for even cheap receivers. I think the good common-mode rejection from the differential amplifier eliminates the need for a shield, too. This active antenna for the shortwave band provides surprising performance, even indoors.
As the name implies, the main loop is made from a Hula-Hoop with the metallic paint stripped off and a single turn of 14AWG copper wire inserted inside the hoop. There isn’t any need to remove the paint; mine was flaking and I didn’t like the looks. Half way through I regretted my decision! These hoops are basically thin-walled plumbing tubing with a water-tight connector holding the ends together.
SOLVED: How do I connect an external AM antenna
That is certainly the case with the basic “loop” antenna, an often misunderstood critter, but one that gives absolutely the most for each foot of wire of any antenna I have had occasion to play with. They are long, long, long Who has room for over feet of wire in the case of a full-wavelength loop for meters? Won’t that thing become the perfect conduit right into my house for lightning and other “wrath of God” type things?
To connect an external AM antenna, follow these steps: Insert the AM antenna plug into the AM Antenna jack on the back of the Bose® system Place the circular loop of the antenna as far away as possible from sources of electromagnetic interference, such as fluorescent lights, dimmer switches, etc.
It is also a very compact design lending itself well to a variety of mounting options and locations inside and outside. Outside will give the best performance. The Pennyloop antenna started out as a single loop antenna and could be used with a reflector. It was found through extensive testing, at least in my area, that the UHF signal strength is very “layered”.
A single loop antenna, or even a simple thick element dipole for that matter, would pick up all of my distant stations – Just not at the same height! A new design emerged from this common issue with UHF signals. The antenna did not need to be excessively tall, but needed some additional height to cover each of the signal layers at the same time. This design goal was achieved in the Pennyloop by having a second loop installed on the original feed point.
It served several purposes. It increased the gain substantially, focused more on the horizon where the signals were coming from, and gave the additional height needed to be in each of the signal layers simultaneously.
Variable Capicitor Hook Up
Share on Facebook Modern radios typically contain two antennas. The FM antenna is the metal rod that extends and swivels. The AM antenna is normally inside the radio.
Oct 13, · Thanks, Bill! My Technics receiver now picks up a whole lot more AM stations than it used to, now that I finally have the correct loop antenna for it.
The Twin Coil can double the signal strength of any weak station during the day. The antenna was designed to work with everything from portable radios without antenna connectors to home stereos with wire antenna terminals. Its wireless ferrite stick works on radios without antenna connectors, while the typical wire patch cord functions with radio antenna connectors found on stereos. In this case the additional antenna will only help with very weak signals where improvement is not already noticed.
If you have a favorite AM radio station but experience poor reception at the exact place where you want your radio, the Twin Coil can increase your AM radio reception significantly. The antenna element is capable of picking up a clean signal some distance from your radio and sending it to the radio and overriding the static. This feature alone can make it the ideal AM antenna because there is no other way to get a clean signal. It has the highest gain of any commercial AM antenna.
The antenna element has directional characteristics. By rotating the antenna element in a window or outside you can improve the signal strength. As with any AM Antenna, you need to take the time to experiment to find the best location and direction for the antenna.