BPL: Broadband over Power Line
More BPL Info:
In the event you ever want to quote Mr. Adams admitting that BPL does
indeed interfere with ham radio, here is the article (link available from
the ARRl web's BPL "News and Updates" as well).
and to refresh all of us, here is Walt's most excellent admission:
"It's not a question of whether BPL interferes with ham radios. It does,"
Walt Adams, Vice President of New Technology, COMTek
4/15/2005 Note from W1CRO:>Hello All:
>As I prepared to present the marinated chicken to the Canova Ranch fire
>gods, I happened to find this month's IEEE Communications Magazine. What
>luck! Almost an hour to read (with occasional spurts to the grille to
>keep the flame from eradicating supper).
>The April 2005 issue (Volume 43 No. 4) is not on the web yet - and you'd
>need to be a member to get at it, I think. So here's an abstract of a
>submission to "Topics in Emerging Technologies"
>"Interference Characteristics of Broadband Power Line Communication
>Systems Using Aerial Medium Voltage Wires" by Paul S. Henry, AT&T Labs-
> - "The promise of broadband power line (BPL) communications -
> broadband access to virtually every home in the United States - will
> remain unfulfilled if the radio emissions from these systems cause
> significant harmful interference to other users of the wireless
> spectrum. This article presents an elementary analysis of the physical
> mechanisms underlying these emissions, from which the interference
> characteristics of BPL can be derived ..."
>The paper is presented as an elementary analysis focused on a single BPL
>transmitter. The "going-in premise" is that issues of compatibility with
>other users of the radio spectrum need to be resolved before widespread
>BPL access can become a reality. It describes the baseline system model
>used, along with a description of the electromagnetic fields. Giving some
>fundamental ideas about how BPL RF signals propagate, it acknowledges that
>far field effects can be significant ("Although the most intense
>interference from a BPL system is confined to the immediate vicinity of
>the MV wire, serious long-range effects can also occur."); and mentions
>the "small but non-negligible, off-axis radiation, a problem made worse by
>inevitable discontinuities in MV wires" in regard to the interference
>potential to aircraft flying over a BPL network (where the aircraft can be
>simultaneously exposed to radiation from hundreds of transmitters).
>The author describes measurements of a BPL system (not named) made by an
>AT&T Labs team in February 2004 that led to their conclusion that
>collected data suggested operation within, but very close to, the limits
>set by rules recently adopted by the FCC.
>The paper also addresses the BPL susceptibility to incoming
>interference. The example given was a 1 kW transmitter at a range of 1 km
>delivers approximately 5 dBm to the BPL system. <My add> - cut that to
>100 watts and it is 10 dB less (-5 dBm). Drop it another 10 dB to 10
>watts and it's still enough for my IC-703 to rain on their parade,
>especially if it happens to be connected to my Yagi. the author notes
>that "At shorter distances, the received power level will show
>approximately an inverse square increase." <interject> Boy those old guys
>(Maxwell, et al) were really sharp weren't they!?
>Several references were made to a Phase II NTIA study. I need to go find
>out about that.
>Just some tidbits to tickle your fancy. Perhaps the magazine is available
>here at the Prince William County library system. But don't look for it
>in Manassas City unless you know the secret handshake<grin>.
ARRL - "BPL is seriously degraded by nearby radio transmitters"
"A site to educate everyone on all aspects of BPL"
- "Another article with little technical
input. It's all about marketeering and money."
Email your favorite one liners to kc0osg, and I'll Post em'
Waterboy BPL: Ben Franklin didn't create BPL! I did! Ben Franklin is the devil!
Star Wars BPL: Luke turn to the BPL side and together we will rule the FCC Galaxy!
Star Trek BPL: Damn it Jim! I'm a doctor, not a BPL engineer!
Milk BPL: Got Interference?
GEICO BPL: Good news I just a a great rate on my BPL!
Forrest Gump BPL: Run BPL Run!
4/9/05 This one is from W1CRO in Manassas, Virginia:
Message ----- From: "A. R. Whittum"
AS SEEN ON TV - NOT IN STORES - ACT NOW- OPERATORS ARE STANDING BY
This page was last updated: 01/18/2006 04:30:43 PM -0700