Calculating RF Power Using a Spec-A

Discussion in 'General Electronics Chat' started by radiohead, Jan 28, 2010.

  1. radiohead

    Thread Starter Distinguished Member

    May 28, 2009
    I have this somewhere in my notes, but I can't seem to find it. Can anyone point me in the right direction to calculate [roughly] the RF power output (in watts) of a transmitter using a spectrum analyzer?

    It is operating on 3VDC, has a current draw of 9.58mA. The Spectrum Analyzer is reading -34dBm at 1.03GHz, 12 inches between the antenna of the Spec-A and the transmitter.

    Thanks in advance. :confused:
  2. MikeML

    AAC Fanatic!

    Oct 2, 2009
    Why dont you terminate the transmitter into a 50Ω load (not an antenna) and use the spectrum analyizer to read the power level directly. -30dbm wont hurt it...

    Other wise, separate the receiving antenna further (to get out of the near-field region) and use this.