[opendtv] Broadcasters File 'Emergency Request' on White Space Plan
- From: "Manfredi, Albert E" <albert.e.manfredi@xxxxxxxxxx>
- To: <opendtv@xxxxxxxxxxxxx>
- Date: Mon, 20 Oct 2008 15:19:46 -0400
http://www.tvtechnology.com/article/68470
This other TV Technology article says:
"Portable devices that use both spectrum-sensing technology and
geolocation databases to prevent interference to DTV would be limited to
100 mW of power, or 40 mW when operating on channels adjacent to active
DTV channels. If the devices use only spectrum sensing, they would be
limited to 50 mW, or 40 mW on adjacent channels."
So I must have missed the permission for sensing-only devices.
Either way, flaws remain. Surely, the FCC can figure these numbers out.
A WSD transmitting 100 mW at 10 meter distance creates a signal strength
of -28 dBm at the receiver's antenna. That's a strong signal, but
hopefully it's not in the channel of one of the local stations (at
least?).
So okay, reduce power to 50 mW for the auto-sensing-only devices. Big
deal? Do the numbers.
The signal strength at the receivers, 10 meters from the WSD, is still
-31 dBm. Whoopie. How does that solve anything? Auto-sensing devices are
fooled often enough, as the study showed, and -31 dBm is still a very
strong signal compared to the majority of OTA reception situations. Come
now.
Bert
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