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· Godfather
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HIPAR said:
Has anyone been following the 'White Space' debates?

http://broadcastengineering.com/news/fcc_wireless_white_space/

Certainly, in today's technological enviornment, spectrum cannot be wasted through under-utilization.

--- CHAS
The frequencies are already in use. Hospitals use them for heart monitors. Do you know what happened at Baylor U. Medical Center when WFAA signed on their DTV transitter? WFAA-DT shut down until the hospital spent $200,000 on new equipment. Networks and broadcasters also use the frequencies legally for wireless mikes.

Many companies also sell wireless mikes and headsets that are on broadcast channels to theater groups, sports teams, and churches. It's not clear that such use is allowed under the current rules.

What is clear is that the current uses of the so called "white space" is threatenened by the new FCC proposal.

Recently the FCC has cracked down on illegal FM transmitters sold as part 15 devices. Both Sirius and XM Radio recalled products and redesigned their equipment due to wide bandwidth, excessive power, and operation below the FM band. Yet third party engineering companies had certified them as legal even though they weren't. Many FM transmitters for iPods have similar problems. The FCC was slow to address the issue.

The issue boils down to portability. If you find that a device works fine in your house, and you put it in your car, how will it know to turn off when your drive to another city? Can you bring it into a hotel room in another state without causing interference?

The FCC is asking if there are reasonable solutions to these problems. I believe that the FCC will approve such devices in spite of the interference that they will cause.

I hope that nobody dies.
 

· Godfather
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450 Posts
Nick said:
I just 'wooted' the XM Roadie XT -- it comes with two add-on chokes that I am
supposed to affix to the antenna wire and the 5v power cord. I am considering
leaving them off for asthetic reasons. What undesirable effects, if any, might be
expected without these external filters installed?

I wouldn't want it to adversly affect fellow exercisers down at my local hospital's
Cardiac Rehab Unit where I work out several times week! :eek2:
Heart Monitors should not be in the FM band. If you have selected a clear channel with no stations above or below the frequency, the use of the device without the chokes shouldn't cause harm. If you drive to another city, select a clear channel in that area, or turn it off.
 
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