rf output measurement

Discussion in 'The Projects Forum' started by deepak007, May 15, 2008.

  1. deepak007

    Thread Starter Active Member

    Sep 30, 2007
    59
    0
    hello

    recently i found a power meter circuit to measure the rf output of a micro voice transmitter. i am enclosing that circuit. the circuit is to be connected at the antenna output. the output of the circuit is measured using a voltmeter. now , my doubt is if we place a voltmeter at the antenna terminal it shows the dc voltage,right? so, it is dc voltage not RF outout, right? i have to add an isolating capacitor to isolate dc, then we can see the rf output. am i correct. i am enclosing both the transmitter circuit and the power meter circuit. please see and tell me if the output i am seeing is dc or rf.
     
  2. deepak007

    Thread Starter Active Member

    Sep 30, 2007
    59
    0
    please see this also. these are the parts list of the power meter
     
  3. beenthere

    Retired Moderator

    Apr 20, 2004
    15,815
    282
    All the rectification and filtering is present in the RF power meter. D1 is the rectifier and C1 the filter. R1 and C2 have some further filtering function plus output scaling so the meter may read the charge on C2 as RF power. R2 - R5 are for the 50 ohm impedance match and dissipation of heat.
     
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