Mr. Allen, I have had some experience with biconilog, log periodic, and biconical antennas for both emissions and immunity testing. I never had any issues with the biconilog when used for immunity testing. However, after using the biconilog for emissions testing on a 3 meter OATS, I went back to seperate antennas. I found that the discreet antennas offered better loss factors and a more linear calibration plot. I also found the biconilog to be VERY directional. This made it more difficult and tedious to ensure repeatable measurements with the biconilog.
Just my 2 cents. Regards, Randy Flinders EMC Engineer Emulex Corporation [email protected] aka.... Chairman Orange County Chapter IEEE EMC Society [email protected] "Tudor, Allen" wrote: > > Greetings, > > I am having a fully anechoic pre-compliance test chamber built. By fully > anechoic, I mean ferrite tiles will be installed on the floor as well as the > walls and ceiling. The inner dimensions of the chamber will be 24 feet long > by 14 feet wide by 13 feet high. The chamber will be used for radiated > emissions as well as radiated immunity. Radiated emissions testing will be > from 30MHz to 1GHz. > > I am looking at a biconilog antenna that can be used for emissions and > immunity testing. However; for emissions measurements, the salesman > recommends that I use separate biconical and log-periodic antennas. He says > that if I use the biconilog antenna for emissions measurements, there will > be some coupling to the ground plane when the antenna is in the vertical > position. However, this chamber will have ferrite on the floor, so I don't > know if that is a valid argument. > > Aside from the expense of two additional antennas, I have two conflicting > concerns. > 1. I would rather not have to work with more than one antenna if I don't > have to due to down time and possible damage to an antenna. > 2. On the flip side, I want to make sure that I have repeatable results, > especially at the low end of the spectrum. > > Any advice would be greatly appreciated. > > ------------------------------------------- > This message is from the IEEE EMC Society Product Safety > Technical Committee emc-pstc discussion list. > > To cancel your subscription, send mail to: > [email protected] > with the single line: > unsubscribe emc-pstc > > For help, send mail to the list administrators: > Jim Bacher: [email protected] > Michael Garretson: [email protected] > > For policy questions, send mail to: > Richard Nute: [email protected] ------------------------------------------- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. To cancel your subscription, send mail to: [email protected] with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Jim Bacher: [email protected] Michael Garretson: [email protected] For policy questions, send mail to: Richard Nute: [email protected]
