"Walter Maxwell" wrote in message
...
Quoting from the original post in this thread:

"People in New York didn't even need radios. They could sometimes hear
voices in
their furnaces
and coming off chain-link fences. Light bulbs lit up in people's houses
even if
they were switched off. "

These are the phenomena reported from WLW's 500 kw operation in the
1930's.

In the late 1950's White's Radio Log reported XEX (Mexico City) had a
megawatt of power for a while -- several years, perhaps. Later reports gave
their power as 500 KW. I never heard them in NY because there was always
somebody else blocking them. Presently they're on 730 and listed at a
featherweight 100 KW.
http://www.fcc.gov/fcc-bin/amq?list=0&facid=101201.

What's the record for max BCB power?

Sal M. Onella wrote:
. . .
What's the record for max BCB power?

Dunno, but some of the SW BC stations sure are impressive. I had the
opportunity to see the Deutsche Welle facility at Wertachtal, Germany a
couple of years ago. It has, I believe, 12 ea. 500 kW transmitters, and
the antenna consists of several miles of curtain array with reflector
grids on both sides for reversibility, arranged in a pattern of three
long radials from a central building. It can also be electronically
steered to some degree. Modulation could be heard at about a half mile
from the antenna, apparently from vibration of some of the antenna feed
components. That facility leases time to many other international
broadcasters.

Roy Lewallen, W7EL

On Aug 6, 9:23 pm, Roy Lewallen wrote:
Sal M. Onella wrote:
. . .
What's the record for max BCB power?

Dunno, but some of the SW BC stations sure are impressive. I had the
opportunity to see the Deutsche Welle facility at Wertachtal, Germany a
couple of years ago. It has, I believe, 12 ea. 500 kW transmitters, and
the antenna consists of several miles of curtain array with reflector
grids on both sides for reversibility, arranged in a pattern of three
long radials from a central building. It can also be electronically
steered to some degree. Modulation could be heard at about a half mile
from the antenna, apparently from vibration of some of the antenna feed
components. That facility leases time to many other international
broadcasters.

Roy Lewallen, W7EL

No wonder, then, that they can put a 0dBm signal into a decent ham
antenna on 7MHz on the US East Coast. Still, I'm always in awe of the
efficiency of propagation through the air, bouncing between the
ionosphere and the earth/oceans. On the same roughly 5000 km path
through a piece of dry air insulated minimum loss copper coax 1/3
meter diameter (a bit over a foot diameter; about 5 millidB/100feet
loss@7MHz), fed 6 megawatts at the input, you get an undetectable
signal out the other end, over 800dB loss yielding an output less than
-700dBm. [6 megawatts at 76 ohms is 21kV rms, so a line that large
should handle the voltage, but at the transmitter end, such a line
would dissipate about 60 watts per foot.]

Cheers,
Tom

Sal M. Onella wrote:
In the late 1950's White's Radio Log reported XEX (Mexico City) had a
megawatt of power for a while -- several years, perhaps.

In 1953, XERF at 250 KW in Villa Acuna was the strongest
station on the dial in East Texas. Their studios were across
the Rio Grande River in Del Rio, TX. For some reason, I
remember the White Rose Petroleum Jelly commercials.
--
73, Cecil http://www.w5dxp.com

On Thu, 07 Aug 2008 09:43:48 -0500, Cecil Moore
wrote:

Sal M. Onella wrote:
In the late 1950's White's Radio Log reported XEX (Mexico City) had a
megawatt of power for a while -- several years, perhaps.

In 1953, XERF at 250 KW in Villa Acuna was the strongest
station on the dial in East Texas. Their studios were across
the Rio Grande River in Del Rio, TX. For some reason, I
remember the White Rose Petroleum Jelly commercials.

Wolfman Jack... 100 baby chicks for $2.98, shipped to your door!

bob
k5qwg

Sal M. Onella wrote:

What's the record for max BCB power?

I don't think any of the "national" radio stations
in the Mideast run more than 1 Megawatt. Here's
some interesting stations from the Americas:

PJB3 800 kHz ND1 Daytime TRANSWORLD R 800.0 kW
ZYJ-457 800 kHz ND1 Daytime RIO DE JANEI 900.0 kW
YVTB 800 kHz ND1 Daytime MARACAIBO 5 900.0 kW
YVKY 710 kHz DA1 Daytime CARACAS 11 900.0 kW
YVKG 950 kHz DA1 Daytime CARACAS 2 400.0 kW
YVLL 670 kHz DA1 Daytime CARACAS 9 500.0 kW
ZYH-446 740 kHz ND1 Daytime SALVADOR BR 800.0 kW
ZYH-707 AM 980 kHz ND1 Nighttime BRASILIA 600.0 kW
ZYK537 AM 1040 kHz ND1 Nighttime SAO PAULO 900.0 kW
ZYJ-455 AM 1280 kHz DA1 Nighttime RIO DE JANEI 700.0 kW
HCXY1 AM 620 kHz ND1 Daytime LOJA EC 900.0 kW
HCJB1 AM 690 kHz ND1 Daytime QUITO EC 600.0 kW

Jim, K7JEB