[BC] Class C AM Stations

[Mark Humphrey]

On Tue, Feb 16, 2010 at 7:27 PM,  <RichardBJohnson at comcast.net> wrote:
> <grin>
>  Iron curtain?
> </grin>

One of the more interesting items on display at the Telecommunications
Museum in Berlin is a 2 kW medium-wave jamming transmitter
(Störsender) that was deployed by the Soviets in 1953 to impair the
reception of West Berlin's news and information station RIAS.  A
number of these jammers were set up in East Germany during the Cold
War, but the west retaliated by increasing the power of RIAS to 300
kW.    There's nothing like brute force to get the message out.

In the late '70s, RIAS installed a crossed-dipole CP antenna at its
Britz 989 kHz transmitter site.  Imagine a huge FM panel antenna aimed
straight up and you'll get the general idea; it was intended to
provide close-range nondirectional skywave service similar to the NVIS
technique used by low-band hams.
http://en.wikipedia.org/wiki/Transmitter_Berlin-Britz

Some photos of the Britz "Kreuz-Dipol":
http://www.oldradioworld.de/rias.htm

Here's an article I just found in a Google search discussing jamming
activities that took place in those days:
http://www.voacap.com/documents/jamming_radio_broadcasting_VKL.pdf

Mark