rf output measurement

Thread Starter

deepak007

Joined Sep 30, 2007
59
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.
 

Attachments

beenthere

Joined Apr 20, 2004
15,819
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.
 
Top