need a fm or rf pen sized transmitter

Discussion in 'Wireless & RF Design' started by cobra9646, Jan 31, 2011.

  1. cobra9646

    Thread Starter New Member

    Jan 31, 2011
    Is it possible to build a rf or fm transmitter that would fit inside a pen and run on a small battery with a range of 100yards?? It only need to emit a frequency or a beep that i could use a receiver to find it.
  2. thatoneguy

    AAC Fanatic!

    Feb 19, 2009
    There are many "spy" transmitters available at tons of web stores.

    Trying to get 100yd range from one is a different issue, unless it is line of sight and you have a very directional antenna on a good receiver, and the band used is "clean" (no distant radio stations near frequency).
  3. radiohead

    Distinguished Member

    May 28, 2009
    what frequency range? Do you have a receiver for that frequency range? What's the application?
  4. cobra9646

    Thread Starter New Member

    Jan 31, 2011
    frequency dosent matter, I do not have a receiver but im guessing that will be the easy part. I do not know much about electronics, but I would be willing to pay someone to build me one. It would also need to run on a very small battery. It will be used to track small animals in the woods.
  5. someonesdad

    Senior Member

    Jul 7, 2009
    You should type in obvious search terms into your favorite search engine. I typed in "radio tracking device for small animals" and found something suitable in the first few hits: and (and here's one that uses an FM radio receiver). The schematic is there along with a parts list; I'd imagine any ham could construct the thing for you. That's half the battle, as you'll also need a receiver (a ham could help you with that too).