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Hello Sam, The diode detector is used to trigger the envelope of the signal. Actually this diode has to be used to determine the power output of the unit since the 802.11(b) would have BW around 10 MHz( the duty cycle would be used to correct the peak power that needs to be below 20 dBm). The FCC recommends to use this method to determine the power output of any large BW signal( the power meter sensor's would not be able to do so) I would not recommend to determine the duty cycle of your unit by using a direct connection on your SA or oscilloscope. In any case, it would be up to your reviewer to accept this kind of method.
From: Sam Wismer [mailto:[email protected]] Sent: Monday, October 06, 2003 10:43 AM To: EMC 2 Subject: EN 300 328-1 Hi All, Section 7.2.1.2 step 1 seems to be a method of determining the duty cycle of the EUT. This step calls for a diode detector for the measurement. My quick research shows this to be a fairly expensive accessory piece of equipment. I have a couple of questions. 1) What is the purpose of the diode detector? Normally I use a direct connection when measuring duty cycle? 2) I have tested RLAN products in Europe to this standard before, and the test house over there simply asked me what my duty cycle was. They never measured it. Is it permissible to show the duty cycle in the form of timing diagram instead. The FCC allows this. Kind Regards, Sam Wismer Engineering Manager ACS, Inc. (Tel: (770) 831-8048 ÊFax: (770) 831-8598 :Web: www.acstestlab.com <http://www.acstestlab.com/> * <mailto:*[email protected]> [email protected]
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