The frame is generally made by joining two pieces of wood together to form an X shape. On a spiral loop antenna, the copper winding begins on the outside edge of the X and is wound in a spiral shape toward the center. An edge-wound loop antenna uses the X-shaped frame constructed from 1-by-6 inch boards. The ends of the board are notched at half-inch intervals and, as the name suggests, the copper wire is wound around the edges of the frame.
In both cases, the two ends of the wire are connected to a variable picofarad capacitor that is used to tune the antenna to the correct frequency for the radio station. Take two inch 1-by-6 inch boards and place a mark on both at the mid-point on one edge. Use a square to mark a slot beginning at these marks running to the middle of the flat side of each board. A 1-byinch piece of finished lumber actually measures three-quarters of an inch by five-and-a-half inches, so the middle of the flat side will actually be two-and-three-quarters inch.
Use a small handsaw to cut the marked slots out of each board. Put the boards together by aligning the slots and pushing the outside edges of the boards until they reach the bottom of the slot. The coil intensifies the signal which is inductively picked up by the ferrite antenna inside the radio. Please let us know of your successes or failures so fellow listeners can benefit from your experiences. You can experiment with the diameter of the coil, the number of turns and the length of antenna wire you use. This antenna works great on the AM band because of the properties of these frequencies.
Loop antennas can work on other frequencies also but need some modification because of the frequency property differences. There are probably some discoveries to be made in the future with loop antenna research. As always, we value your opinion and encourage questions. Please feel free to contact us or leave a comment. Thanks for the info. A station about 30 miles from me just cut their power way down. I am going to try your tips to see if I can pick them up again.
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Instructions for an AM Loop Antenna
I bought this model because it has antenna in-puts. I plan to put a roof top anntena up, but am not finding a sutable schematic online. Must the insulated wire be single strand and what diameter is recommended? Single strand or multi-strand is fine as long as it is insulated and not shielded. RG or RG are the grades I use.
One day I stumbled upon a great video for this. The video host gives a great step-by-step walk through on creating one. Especially with this new chip. I have tried this at home…but i still have a lot of noise even if i have a good ground stake…. Are you using copper or steel grounding steaks? Copper is the best conductor.
AM loop antenna assembly
Is the soil somewhat moist or completely dry? Slightly moist soil is better. Also is the radio run on AC or batteries?
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If AC, there could be cycle noise that is being injected. What connects to what? For simplicity sake, they are just handy to use clipped onto the actual copper wire after baring the plastic on the wire vs. The 2nd clip can be used to clip the longer piece of the wire around the metal stake to the shorter wire that is coiled and near your radio. I hope this answers why the extra clip suggested. Neither work with the TX receiver. I tried a quick build 4 loops of wire on a square box that is about 14 inches on each side. Connected the two ends to the two antenna connectors on the TX and that at least picks up strong AM stations but there's a lot of static on weaker but not that weak AM stations.
Do receivers need a specific AM loop antenna to match their internal circuitry? Hi Morris, one old trick is to run a long peice of wire out the window and raise it at the far end, like in a tree or other support. Now on the end back at the radio, wind the same wire around the outside of the radio cabinet about 5 or 6 turns. Also, try and ground your radio properly to a good earth ground. Good Luck with that and I looked at you manual.
I suspect your input is 75 ohms and not a high impedance and not equipped with a ferrite loopstick antenna. This is usually specified again across a 75 ohm impedance.
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- Connecting Component AM Receiver to Loop Antenna.
So the challenge in putting up a simple AM antenna is to generate as much signal voltage across this challenging low resistance. There is a solution and it is known as impedance matching Not going to go there! You mention building a loop on a card board box or frame.
However, if you provide the ability to TAP the loop along its perimeter that will assist you increasing the receive signal. You also need to "resonate" the loop and again just connecting across the AM terminals will destroy that ability to resonate I built a much smaller one that sits on a table 8 inches on a side. Your manual is a little confusing by the way I think what they mean is when the loop is in use remove the ground tab from the AM antenna terminals.
AM loop antenna for my receiver
When the long wire is used, you should then find a ground point and connect this tab back. I hope this helps. Moderator Member Offline Posts: Typically, this receiver, along with many others, comes with this type of AM loop antenna. Sometimes the inductance is even marked on the loop. If you're not using the loop that came with the receiver, you most likely at the very least, would have to adjust the internal AM front end to increase the usefulness of the loop you are using.
Opcom on June 12, , W4AMV on June 12, , Trying a similar one from a Sony receiver worked OK, but the perception was not quite as good.