Doug, Rooftop sites have a number of problems. I'm sure the folks who have actually built them can elaborate more, but one that jumps to mind is the fact that you will have a worse ambient than at ground level. The VHF and UHF signals that comprise the ambient tend to be line of sight, and raising yourself above the average terrain increases the distance at which transmitters may be received. Thus, you'll suffer interference from FM and television stations that are farther away than if you were at ground level.
Ghery Pettit Intel -----Original Message----- From: POWELL, DOUG [mailto:doug.pow...@aei.com] Sent: Friday, April 26, 2002 9:21 AM To: EMC-PSTC (E-mail) Subject: Considering a rooftop OATS Greetings all, I am considering a proposal to build a pre-compliance OATS on the rooftop of our facility. I am interested in hearing any experiences along this line especially any unexpected difficulties that came up. I am considering a 10 meter site on a raised framework or platform with turntable. There are a number of air-conditioning units on the roof. If needed, I can place grounded chain-link fence around these as a sort of faraday cage. A binocular scan of the surrounding area reveals a power substation about 1/2 mile away. Other items in the area are a cell phone tower about 2 miles away and there are nearby office buildings with small dish antennas and the like. Some of these are undoubtedly site to site wireless data communication. I still need to get my antenna out on the roof and do a quick scan. The equipment to be testing is sometimes rather heavy and I need to consider an elevator or at least an equipment hoist over the edge of the roof. Additionally, I am considering some kind of a portable weatherproof enclosure over the turntable. Thanks in advance for your comments, -doug ----------- Douglas E. Powell, Compliance Engineer Advanced Energy Industries, Inc. Mail stop: 203024 1626 Sharp Point Drive Ft. Collins, CO 80525 970.407.6410 (phone) 970-407.5410 (fax) mailto:doug.pow...@aei.com ----------- _________________________________________ This message, including any attachments, may contain information that is confidential and proprietary information of Advanced Energy Industries, Inc. The dissemination, distribution, use or copying of this message or any of its attachments is strictly prohibited without the express written consent of Advanced Energy Industries, Inc. ------------------------------------------- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Ron Pickard: emc-p...@hypercom.com Dave Heald: davehe...@attbi.com For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org All emc-pstc postings are archived and searchable on the web at: http://ieeepstc.mindcruiser.com/ Click on "browse" and then "emc-pstc mailing list" ------------------------------------------- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Ron Pickard: emc-p...@hypercom.com Dave Heald: davehe...@attbi.com For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org All emc-pstc postings are archived and searchable on the web at: http://ieeepstc.mindcruiser.com/ Click on "browse" and then "emc-pstc mailing list"
