We seek to understand and document all radio transmissions, legal and otherwise, as part of the radio listening hobby. We do not encourage any radio operations contrary to regulations. Always consult with the appropriate authorities if you have questions concerning what is permissable in your locale.

Author Topic: Questions about part 15 shortwave  (Read 901 times)

Offline Shortwave_Listener

  • DXing Phenomena
  • *******
  • Posts: 3226
  • British Columbia, Canada
    • View Profile
    • The Shortwave Listener
Questions about part 15 shortwave
« on: February 20, 2022, 0024 UTC »
I am interested in building a part 15 shortwave station. I would like to use the transmitter design in this video https://m.youtube.com/watch?v=4UGzL5FCcMM . I have a few questions about it. Is it possible to determine the power output, and how can I calculate how many microvolts/meter at 30 meters is it outputting? What antenna length is need to get 10000 microvolts/meter at 30 meters (the legal limit)? Approximately what is the range you can expect at 10000 microvolts/meter at 30 meters? I am going to use a 13.56 MHz crystal instead of 8 MHz. Correct me if 10000 microvolts/meter at 30 meters is not the correct limit in Canada.
« Last Edit: February 20, 2022, 0141 UTC by Shortwave_listener »
Lucas Bandura
eQSL appreciated! lucasnerite@gmail.com
Songs are identified with Shazam if needed. I usually use KiwiSDR receivers. Reception from my QTH is using a Kenwood TS-570D or RTL-SDR V3 with a 40 meter band Inverted V at 50 feet.
My website: https://swl7.wordpress.com/
Shortwave Radio Archive: https://www.youtube.com/@SW_Archive

Offline NJQA

  • Sr. Member
  • ****
  • Posts: 308
  • Virginia
    • View Profile
Re: Questions about part 15 shortwave
« Reply #1 on: February 20, 2022, 1429 UTC »
This ISM band runs from 13.553 to 13.567 MHz - a 14 kHz wide bandwidth.  It won’t support more than one or two AM transmitters.

This doesn’t seem like a good idea.

* If you want to stay legal, your output power will only be a few milliwatts at best.

* You are going to be competing will all sorts of industrial noise emittters.

* You are going to be interfering with a number of established hobbiest beacons.
« Last Edit: February 20, 2022, 1436 UTC by NJQA »


Item image   Pair Hamamatsu 931A Photomultiplier Tubes PMT NOS Free Shipping