Friday, April 2, 2010

Transmit Beacon for Hand-held Radio





The circuit is run by 555 timer IC for its PTT sequence that is 4 seconds "on" and 4 seconds "off". Transmission is about 50% duty cycle that minimize the transmitter heat. Tone IC is any thing that generates sound, I got mine from a magnetic door open sensor which I bought from Japanese Store in Festival Mall. The prototype when connected to a portable transceiver is ready to go on air.  ---73 de hevir

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3 comments:

  1. Mike Bravo 7395April 8, 2010 at 12:04 AM

    wow ! bai hevir nindot ni project, keep up your work ! cge gyud ko visit sa u site kay daghan ka interesting projects ! hope to catch u on air ! mabuhay ka idol !
    mike bravo/decada7

    ReplyDelete
    Replies
    1. golden eagleApril 23, 2014 at 10:37 AM

      simply wonderful. thanks 73 de vu3inj. indrajit

      Delete
    2. hevirredApril 25, 2014 at 5:09 AM

      Thanks for visiting sir. 73 de du1vss.

      Delete