Hi Group, It's been quite a while since I've done this so I figure I would ping it off the group for a consensus. Back in the old days, you could use a Dipole antenna to take radiated emission measurements for frequencies that were either failing or were close to the limit. Is that still legal for FCC-A radiated emissions testing? For background info, by tuning the dipole antenna to the exact frequency, you were able to obtain a more accurate reading than using a broadband antenna. Sometimes you would gain a few dB, sometimes you would lose a few dB. One thing I remember about this that was flakey, was if you did this for a low end frequency such as 30 Mhz in vertical polarity. At that frequency, the elements on the dipole antenna seem to be about a mile long. There was no way to take a vertical reading at that frequency at a height of 1 meter without breaking the antenna element. You therefore had to raise the antenna above 2+ meters to take the reading. In horizontal polarity this was not an issue. All comments appreciated............. Thanks, Jeff Collins ---------------------------------------------------------------- This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. Website: http://www.ieee-pses.org/
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