DavePR
join:2008-06-04
 ·DSL EXTREME
| reply to funchords
Re: OET is not independent!
said by funchords  :...the NAB and microphone folks made it clear that the science didn't matter. The science says it won't work. Read the engineering study before you make these pronouncements. The FCC decision was 100% political. |
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funchords
Hello
Premium,MVM
join:2001-03-11
Washington, DC | Dave, I read the study (it's about an inch thick). |
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DavePR
join:2008-06-04
·DSL EXTREME
| Are you an RF engineer?
The test results do not support any conclusion other than that a device that relies on sensing alone cannot work.
Devices that use geolocation and database access can avoid stepping on incumbent users, but only if they consult the database before turning on; and only if the database is maintained in real time.
Two questions: How would the device know where it is? How would the device access the database without transmitting? |
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funchords
Hello
Premium,MVM
join:2001-03-11
Washington, DC
·Verizon Online DSL
 ·Skype
| said by DavePR :Are you an RF engineer? Just an experienced ham with plenty of tech experience in VHF and UHF public-safety communications systems as well.
said by DavePR : The test results do not support any conclusion other than that a device that relies on sensing alone cannot work. Which doesn't conflict with the FCC's order! The FCC didn't accept equipment relying on sensing alone.
said by DavePR :Devices that use geolocation and database access can avoid stepping on incumbent users, but only if they consult the database before turning on; and only if the database is maintained in real time. Two questions: How would the device know where it is? How would the device access the database without transmitting? Anything that's going to the field will have to be FCC-accepted so it will have to demonstrate that complies with the order.
You do know we're not the only country doing this, right?
--
Robb Topolski -= funchords.com =- Hillsboro, Oregon
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DavePR
join:2008-06-04
·DSL EXTREME
| I hope you're right. I'm hearing a rumor that each device will be individually addressable so conceivably they can be turned off if they are causing interference.
I do wireless for TV. I am one of the incumbent users. Worst case for me is that we confiscate electronics at the entrance to the venue. My real fear is for OTA TV. That is my preferred way to watch HD. Cable and/or DBS is way too compressed.
This isn't an inch thick, but it's good place to start. Charley Rhodes knows his stuff. Read all his papers regarding the crap tuners in DTV receivers, and the fact the FCC assumed much better tuners when they passed out post-transition frequencies. This whole thing may crash and burn next President's Day night, even without these mythical White Space Devices.
»www.tvtechnology.com/article/18180
73 de kd6il |
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