[R-390] Manassas BPL
Rbethman
rbethman at comcast.net
Sat Jul 10 22:34:04 EDT 2004
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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--
< 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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