I've seen quite a few OATS on rooftops. usually because space at ground level ( no pun intended ) was too much of a premium.
An effect that may be a problem is reflections from the edges of the ground plane if space prohibits a smaller one than desired. If thats the case, you may want to look at adding "petals" to the ground plane edges, I understand that breaks up the reflections so they are less objectional. More of a 5 cents worth... Derek Walton ----- Original Message ----- From: "Pettit, Ghery" <[email protected]> To: <[email protected]>; <[email protected]> Sent: Tuesday, December 11, 2007 11:50 AM Subject: RE: A question regarding OATS setup > There have been OATS facilities placed on top of buildings in the past. > And 60 feet of cable isn't a problem if you aren't going too high in > frequency. Think - Heliax. The grounding conductors will help with > power safety, but at RF how many wavelengths are they? Not exactly a > "ground". > > Now, the question that always come to mind when this is proposed is the > following - When you are installing a TV antenna you put it as high as > possible to get the best signal from the station. If higher ambient > signals are around when you get higher up, why would you put an OATS > there? Not picking on you, I've asked this question many times over the > past 20 or so years. > > Ghery S. Pettit > > > -----Original Message----- > From: [email protected] [mailto:[email protected]] On Behalf Of > [email protected] > Sent: Tuesday, December 11, 2007 8:54 AM > To: [email protected] > Subject: A question regarding OATS setup > > We are considering placing an OATS on the roof top of a building for > some inhouse testing. Does anyone have any experince with OATS on roof > tops? To our lab we may be required to run 60' of cable from our > antenna. Does 60' sound too long? We would like to get good site > attenuation out to 1GHz. Also any suggestions on material for the ground > plane would be appreaciated. Since we will be running the grounding > conductors before we can test the site, we wonder if we should provide > more than one ground connection to the plane. > > Thanks, > Cody > > - > ---------------------------------------------------------------- > This message is from the IEEE Product Safety Engineering Society > emc-pstc discussion list. Website: http://www.ieee-pses.org/ > > To post a message to the list, send your e-mail to [email protected] > > Instructions: http://listserv.ieee.org/request/user-guide.html > > List rules: http://www.ieee-pses.org/listrules.html > > For help, send mail to the list administrators: > > Scott Douglas [email protected] > Mike Cantwell [email protected] > > For policy questions, send mail to: > > Jim Bacher: [email protected] > David Heald: [email protected] > > All emc-pstc postings are archived and searchable on the web at: > > http://www.ieeecommunities.org/emc-pstc > > - > ---------------------------------------------------------------- > This message is from the IEEE Product Safety Engineering Society > emc-pstc discussion list. Website: http://www.ieee-pses.org/ > > To post a message to the list, send your e-mail to [email protected] > > Instructions: http://listserv.ieee.org/request/user-guide.html > > List rules: http://www.ieee-pses.org/listrules.html > > For help, send mail to the list administrators: > > Scott Douglas [email protected] > Mike Cantwell [email protected] > > For policy questions, send mail to: > > Jim Bacher: [email protected] > David Heald: [email protected] > > All emc-pstc postings are archived and searchable on the web at: > > http://www.ieeecommunities.org/emc-pstc > - This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. Website: http://www.ieee-pses.org/ To post a message to the list, send your e-mail to [email protected] Instructions: http://listserv.ieee.org/request/user-guide.html List rules: http://www.ieee-pses.org/listrules.html For help, send mail to the list administrators: Scott Douglas [email protected] Mike Cantwell [email protected] For policy questions, send mail to: Jim Bacher: [email protected] David Heald: [email protected] All emc-pstc postings are archived and searchable on the web at: http://www.ieeecommunities.org/emc-pstc
