I would appreciate some help trying to understand this circuit:
I am looking at a RF Sampling circuit on youtube. Here is the video:
http://www.youtube.com/watch?v=y4Zt...email_reply&feature=em-comment_reply_received
I was curious how he calculated the power dissipation in the resistors.
In the circuit there is a 47KΩ & 690Ω resistor. The author told me the following:
"The assumption made with this circuit is that it is inline between the transmitter and a properly tuned 50 ohm load/antenna. Therefore, the 100W is dissipated in the 50ohm load. That means the voltage on the line is 70.7Vrms. Nearly all of this appears across the 47K resistor, dissipating about an 1/8th of a watt. Then, I used a 4x safety factor."
Would someone who knows more than I know be good enough to let me ask them some questions about this circuit? I would like to calculate the power dissipated in the resistors. It is driving me crazy!
I am looking at a RF Sampling circuit on youtube. Here is the video:
http://www.youtube.com/watch?v=y4Zt...email_reply&feature=em-comment_reply_received
I was curious how he calculated the power dissipation in the resistors.
In the circuit there is a 47KΩ & 690Ω resistor. The author told me the following:
"The assumption made with this circuit is that it is inline between the transmitter and a properly tuned 50 ohm load/antenna. Therefore, the 100W is dissipated in the 50ohm load. That means the voltage on the line is 70.7Vrms. Nearly all of this appears across the 47K resistor, dissipating about an 1/8th of a watt. Then, I used a 4x safety factor."
Would someone who knows more than I know be good enough to let me ask them some questions about this circuit? I would like to calculate the power dissipated in the resistors. It is driving me crazy!