Recent content by Tech2025

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    Radiofrequency communication through tissue

    2.550 GHz is easy to work with and works well trough skin. I'd suggest looking around on NCBI as well.
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    How Do Microwave transmitters work without physical connections?

    So I recently picked up 40 of 10.525 GHz Microwave RADAR transmitters: I opened up one out of curiosity and had something like this (image attached) . I noticed some parts of the PCB aren't even connected to anything. How do the different shapes and sizes of the PCB interact with each-other...
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    Undergrad Why does the sun affect radio wave propagation?

    I noticed HF radio waves travel farther and easier when the sun is out rather then during the night. Why?
    • Tech2025
    • Thread
    • Propagation Radiation Radio Solar Sun The sun Wave Wave propagation
    • Replies: 12
    • Forum: Optics
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    Undergrad Can a Copper Coil Harvest Power from Power Lines for an FM Radio Receiver?

    I had an idea of building an FM receiver that is powered from the electromagnetic fields generated by power-lines. My question is , how can I make the electromagnetic field receiving antenna? Will a simple copper coil work? If so, can the same coil be used as the RF antenna or will that have to...
    • Tech2025
    • Thread
    • Antenna Electromagetic field Fm Line Power Radio
    • Replies: 1
    • Forum: Mechanics
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    How do computers keep time without power?

    I know the CMOS battery keeps the time and BIOS settings , but what is powered by the batter to keep time? A crystal oscillator? And why is it so crucial to keep time on a regular desktop computer?
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    High School Why Do We Lose Cell Phone Connection Outdoors Without Buildings or Cars Nearby?

    Can't multiple different cell towers that close to each other cause interference? Thanks lol
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    High School Why Do We Lose Cell Phone Connection Outdoors Without Buildings or Cars Nearby?

    If Cellular network towers are supposedly divided in cells , like this image , then why do we loose connection even when outdoors and not inside or near any buildings/cars. Also why is it common to see more than 1 cell tower near each other?
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    Best Open source projects to contribute to?

    OpenCV is always an attention grabber, generally anything involving AI.
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    High School Why does time only move forward and not backwards?

    Probably an unanswered question , just wondering what people have to say.
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    High School Why does GPS require an accurate clock?

    Why do GPS need a cesium clock accurate to 10ns? Is this strictly for time keeping or is there some synchronization between satellites?
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    What makes a yagi antenna directional?

    How exactly do the elements "connect" to each other to make an antenna directional? I see some Yagi's have a reflector but most do not.
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    Looking for Ti Calculator Apps? Check out this website!

    This website has some great Ti calc programs https://tiplanet.org/forum/portal.php
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    Undergrad How can I go about making a "Space Proof" coating?

    Yup , found this one http://citeseerx.ist.psu.edu/viewdoc/download?doi=10.1.1.29.5395&rep=rep1&type=pdf
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    Undergrad How can I go about making a "Space Proof" coating?

    So I am planning on launching a Satellite to promote the Dogecoin cryptocurrency. One of the main points is printing/painting (Or whatever) the logo on the side of a metal panel. How can I make it so it doesn't melt off or turn white from radiation so quickly?
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    Electronics 3D Printed 2.25 Ghz Microwave RADAR horn antenna

    I lined the inside and outside of the horn with Microwave paint , seems to work well enough for my use,