[opendtv] Re: White spaces and 700MHz D Block could be part of new US spectrum plan
- From: Craig Birkmaier <craig@xxxxxxxxx>
- To: opendtv@xxxxxxxxxxxxx
- Date: Wed, 30 Sep 2009 09:10:59 -0400
At 10:57 AM -0500 9/29/09, Manfredi, Albert E wrote:
Try using numbers to prove your point, Craig. Honestly, generic,
vague words are unconvincing.
I'll set the scenario for you, and you do some numbers. That might
finally convince you.
The broadcaster uses a mesh of , say, three medium power sticks, say
10 KW ERP, and the closest to you is 10 miles away. Your neighbor
has a handheld, auto-detecting gizmo that is in a poor signal
reception part of his apartment, so it doesn't detect that
transmitter. So, from a distance of 10 feet of your receiver, he
starts blasting away at a "mere" 100 mW (white space devices can go
a high as 1 watt, by the way).
Make this easy, biased towards your intended result: assume only
free space losses.
By how many dB will he swamp your desired TV signal?
0
First there will be a detectable signal from more than one transmitter.
Second, in the unlikely event that there is no detectable signal, the
device will still need to protect known channels in the market based
on GPS and database information.
Regards
Craig
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