[R-390] Manassas BPL
Bob Camp
ham at cq.nu
Sat Jul 10 22:38:12 EDT 2004
Hi,
But soon we will *all* get to live with it.
Guys - if they hold hearings in your area on this stuff go and complain
about it. It's going to mess you up....
Take Care!
Bob Camp
KB8TQ
On Jul 10, 2004, at 10:34 PM, Rbethman wrote:
> Yeah! BUT I'm the one living with it!
>
> Bob - N0DGN
>
> Bob Camp wrote:
>
>> Hi
>>
>> An awful long time ago I had some exposure to "carrier current
>> broadcasting". This is a wonderful idea where you transmit AM
>> directly into a building's power system in order to provide a
>> listening experience for all the occupants.
>>
>> The first thing you find out is that power lines were not designed as
>> RF transmission lines, even at AM radio frequencies. The impedance
>> between the conductors is well below an ohm at RF. You need to feed a
>> lot more into the lines than you might think to get anything useful
>> to happen.
>>
>> The next amazing thing was that after you got all that power in there
>> it would pop up all over the place. We would get hot spots as much as
>> a couple of blocks away. This happened at power levels that just
>> barely covered the building that was our target. Multiple feeds to
>> the building made things even more exciting. Nulls and peaks all over
>> the place.
>>
>> If it's that tough to control at 500 KC then it's going to be a whole
>> lot harder to control at 30 MHz. The primary and secondary power
>> distribution systems were never intended to be part of an RF system
>> in the first place. Anybody who has ever had a RFI complaint into
>> them can tell you just how good they generally are at RF.
>>
>> The cable company runs a system that is designed from the ground up
>> to be RF tight. Finding their carriers floating around in free air is
>> awfully easy. It doesn't even take a R390, you can do it on a rice
>> box. Even with that kind of system they have an awful time tracking
>> down problems as well. The power company won't be any better.
>>
>> The one hope is that the combination of complaints and competition
>> will make this a system that nobody ever makes any money off of. If
>> so it will die out. Remember the woodpecker back in the 1980's - it
>> died eventually. If this thing interferes with what you want to do on
>> HF COMPLAIN ABOUT IT TO THE FCC. The guy that comes around every
>> couple of years looking to get re-elected to the House of
>> Representatives might also be a good one to talk to. This is
>> especially true if elections in your area tend to be closely
>> contested.
>>
>> Boy .. this has me going even harder than the ballast tubes ...
>>
>> Take Care!
>>
>> Bob Camp
>> KB8TQ
>>
>>
>>
>> On Jul 10, 2004, at 9:57 PM, JamesMiller wrote:
>>
>>> As I understand BPL (which isnt much) it comes right to the wall
>>> outlet.
>>> That's the sell feature, your internet comes in on the same plug as
>>> power.
>>> So it may be in your house. I wonder if a heavy duty RF filter
>>> across the
>>> power main coming into the house wouild help?
>>>
>>> Yje ARRL is trying to fight it and needs support. www.arrl.org
>>>
>>> ----- Original Message -----
>>> From: "Rbethman" <rbethman at comcast.net>
>>> To: <R-390 at mailman.qth.net>
>>> Sent: Saturday, July 10, 2004 8:54 PM
>>> Subject: [R-390] Manassas BPL
>>>
>>>
>>>> Well, I've used the R-390A and <groan> a TS-930SAT to narrow it
>>>> down.
>>>>
>>>> The bursts show s-5 on the Kenwood at 1.616Kc. At 29.6Mc it doesn't
>>>> move the needle so much as it IS a constant audio pop.
>>>>
>>>> The results are the same on the R-390A. I just used the Kenwood to
>>>> provide S Units for description.
>>>>
>>>> As I have said before - I live in the part of the city that the
>>>> power is
>>>> UNDERGROUND.
>>>>
>>>> I've put up to 5 rf toroidal chokes on both radios power cords with
>>>> NO
>>>> effect at all. It is definitely radiated!
>>>>
>>>> Now where is riley Hollingsworth's email address. I know I've seen
>>>
>>> it......
>>>
>>>>
>>>> Bob - N0DGN
>>>>
>>>> --
>>>> < Bob Bethman - N0DGN
>>>> +-------------------------------+----------------------------------+
>>>> | N0DGN AMRadio Manassas, VA | REAL Tube Radio and AM |
>>>> +-------------------------------+----------------------------------+
>>>> | Manassas Radio - Home of Homemade Kielbasa & Pirogi |
>>>> +-------------------------------+----------------------------------+
>>>> | Bob Bethman \\\|/// " The absence of a danger |
>>>> | rbethman(at)comcast.net \\ ~ ~ // signal does *NOT* mean |
>>>> | (/ @ @ /) that everything is OK " |
>>>> +-------------------------oOOo-(_)-oOOo----------------------------+
>>>> | <http://home.comcast.net/~rbethman> |
>>>> | 1 BC-610I w/BC-614I,1 T-213/GRC-26 w/BC614I 1 '51 Collins R-390A |
>>>> | 1 '67 EAC R-390A, Heathkit DX-60, Apache, Mohawk, SX-101, HT-32A |
>>>> +------------------------------------------------------------------+
>>>> | Amateur Astronomer - Celestron Nexstar 8 |
>>>> | 12" f5 Dob coming soon! Being built |
>>>> | Meade ETX-60 (Got it back!) |
>>>> | 38 Deg 46.8' N - 77 Deg 28.5' W |
>>>> +------------------------------------------------------------------+
>>>> | Opinions expressed are that of my own and do not necessarily |
>>>> | coincide with or represent those of ANYONE else |
>>>> +------------------------------------------------------------------+
>>>> ALL E-mail received and sent scanned by AVG & Norton Anti-Virus>
>>>>
>>>>
>>>>
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>>>
>>>
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>>
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>
> --
> < Bob Bethman - N0DGN
> +-------------------------------+----------------------------------+
> | N0DGN AMRadio Manassas, VA | REAL Tube Radio and AM |
> +-------------------------------+----------------------------------+
> | Manassas Radio - Home of Homemade Kielbasa & Pirogi |
> +-------------------------------+----------------------------------+
> | Bob Bethman \\\|/// " The absence of a danger |
> | rbethman(at)comcast.net \\ ~ ~ // signal does *NOT* mean |
> | (/ @ @ /) that everything is OK " |
> +-------------------------oOOo-(_)-oOOo----------------------------+
> | <http://home.comcast.net/~rbethman> |
> | 1 BC-610I w/BC-614I,1 T-213/GRC-26 w/BC614I 1 '51 Collins R-390A |
> | 1 '67 EAC R-390A, Heathkit DX-60, Apache, Mohawk, SX-101, HT-32A |
> +------------------------------------------------------------------+
> | Amateur Astronomer - Celestron Nexstar 8 |
> | 12" f5 Dob coming soon! Being built |
> | Meade ETX-60 (Got it back!) |
> | 38 Deg 46.8' N - 77 Deg 28.5' W |
> +------------------------------------------------------------------+
> | Opinions expressed are that of my own and do not necessarily |
> | coincide with or represent those of ANYONE else |
> +------------------------------------------------------------------+
> ALL E-mail received and sent scanned by AVG & Norton Anti-Virus>
>
>
>
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