AM Radio Directional Loop Antenna Demo Homemade..Make Your Own For A Few Dollars! And They Work.

This is the loop antenna calculator page I used design my loop:
http://www.angelfire.com/mb/amandx/loop.html
To see my ham radio and radio related T-Shirt online shop click here for my personal designs: http://www.cafepress.com/73heaven
Now, about this video...See how a home made loop antenna for AM radio can make a difference in the signal heard on a cheap AM transistor radio. You can build your own loop antenna for AM radio reception. Search for AM Radio loop antenna on the internet for plans or to purchase one if you don't want to make one, but you will pay more. They work well however. A picture is worth a thousand words, a video is worth ten thousand or more so that is why I posted this! Thank you for watching and good luck on your own loop antenna. Leave me a question about the loop if you have one and I will try to help out.

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[vertigoandblastoise]

That works fabulous! I wonder what would happen if you had TWO of that loops.....

I am gonna find out for myself, but does it also matter if you make the loops larger?

Are they more powerfull? Or just two loops to make it more powerfull? thanks!

[RadioHamGuy]

@vertigoandblastoise I am not sure how 2 loops would work, but I do know that a larger loop will work better, I have played around with a few other sizes and the larger ones do seem to work better.

[quarknimble]

can you stretch the frequency coverage up to cover the 160m band? (1800-2000khz) i would like it to cover 500/530-2000khz. is this possible with a 365pF cap or will it take more capacitance? (500pF)??

[RadioHamGuy]

@quarknimble I am not sure if you would be able to stretch it out that far or not but I just added a link to the page I used to calculate my dimensions, you can play around with it putting in different values to see where you come out.

[miketmac]

does the size of the wire and the turns matter??? thanks for the help!

[RadioHamGuy]

@miketmac yes it does, I just added a link in my video description that you can use to calculate the dimensions needed. You can play around with the calculator plugging in different frequencies etc using what you have to figure things out, works well.

[miketmac]

@ma3xiu1 Thanks , still trying to find the variable capacitor

[ma3xiu1]

@Ibringthetruth1 generally these AM radios do have a loop antenna inside. In order to keep it small, they use a stick of ferrite to wind the antenna around. However, the efficiency of a loop antenna depends on the diameter of the loop, and which is why this big external antenna works so much better than the built-in loop antenna alone.

[ma3xiu1]

@miketmac yes, the number of turns will affect the inductance of the loop and hence its resonant frequency. Add more turns to lower the range of frequencies covered. The size of the wire also impacts inductance (thinner wire increases inductance), but also affects the "Q" (selectivity) of the loop. Thinner wire increases the overall loop resistance, therefore lowers the Q, and so makes the loop less selective and less efficient.

[ma3xiu1]

@quarknimble you can adjust the frequency coverage either by adding/removing capacitance or by varying the number of turns of wire. So, to cover 160m you would need to reduce the capacitance (eg. by adding a fixed capacitor in series with the variable capacitor) or remove some turns of wire. If you want, you can use a switch to add/remove fixed capacitors from the circuit to extend the overall range.

[jstrunck]

Tunable loops are the best for limited space and work VERY well.

John

[jstrunck]

Super job on the loop!

Tunable loops are the best for limited space and work VERY well.

John

[miketmac]

@RadioHamGuy Building in process