We set up a carrier current AM system at our college in the 1960's. It had
(IIRC) a 5 watt 540 kHz transmitter installed in each dormitory and coupled to
the AC downstream from the pole transformer, at 120/240 vac. It was enough to
get a signal everywhere in the building. We had to do a signal strength survey
to show that the radiated level was down to xx microvolts/meter a few hundred
feet away from the building. The bandwidth was naturally limited to ~10 kHz,
and the interference potential was pretty low.
I'm not sure the exact relevance to current BPL, except that the laws of physics
have probably not changed since then.
73- Martin, AA6E
N6KJ wrote:
As I was rereading the NPRM today, I noticed something interesting that
I haven't heard anyone else mention.
In the very last paragraph on page 2 of the NPRM, there is a footnote
that says:
-------------------------------- Begin Quote ---------------------
Campus radio systems have been operating for over fifty years in the United
States at many universities as unlicensed broadcast radio stations in the AM
Broadcast band, see 47 C.F.R. § 15.221. Initially, the receiver and signal
source were attached to the same electric power line. After the advent of the
transistor radio, receivers are sensitive enough to be able to pick up enough
radiated signal for adequate reception when placed next to the electric power
line in a dormitory or other locations on the electric power lines. See also,
e.g., X-10 products for home automation at <http://www.X10.com>, and products
conforming to ANSI/EIA-600.31-97 Power Line Physical Layer and Medium
Specification (CEBus Standard).
---------------------------------- End Quote -----------------------------
The BPL proponents continue to insist that power lines will not radiate
like an antenna and that their equipment appears as a "point-source"
radiator. If that's true, then why is it possible to place an AM
BC band radio near the electrical outlet in a dorm room and receive a
low-voltage broadcast that originated who knows how far away? This doesn't
sound like a "point-source" to me. Does it to anyone else?
On Fri, 5 Mar 2004 07:47:19 EST, K4VV@aol.com wrote:
For information, here is the action that we in the Potomac Valley Radio Club
are taking. PVRC is a contesting club with several hundred active members in
the mid Atlantic region. I am the current President, and Jim Talens, N3JT is
a lawyer and engineer who has many years of FCC experience. Jim led the
action for our previous submission to the FCC on the BPL issue. This activity
may
be of interest to you. Any supporting input may be directed to Jim, who is
cc'd.
Jack Hammett, K4VV
[Stuff Deleted]
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