High-low ploys in bridge

Usage examples of signals.

Neff had stumbled into a gold mine, because not only had the codebreakers worked on Russian codes and ciphers, but the castle contained a German Foreign Office signals intelligence archive.

Their target was a suspected major Air Force signals intelligence center in the southern Bavarian city of Kaufbeuren, a market center of medieval towers and crumbling fortifications on the Wertach River.

They came upon an entire convoy of four German signal trucks, complete with four Fish machines, a signals technician, German drivers, and a lieutenant in charge.

They had all worked for a unit of the Signals Intelligence Agency of the German Abwehr High Command, a major target of TICOM.

The German machines were able to take the intercepted signals and stitch them back together again in the proper order.

With the end of the war, targets began shifting, the signals intelligence agencies dramatically downsized, and money became short.

San Francisco Conference served as an important demonstration of the usefulness of peacetime signals intelligence.

But instead of establishing a strong, centralized organization to manage the growing worldwide signals intelligence operations, each service was allowed to retain control of both intercept and codebreaking activities.

Any signals even remotely North Korean were transmitted back to AFSA headquarters in Washington, arriving ten to twelve hours after intercept.

The downside, however, was that in order to pick up the signals the intercept operator had to get much closer to enemy lines than normal, sometimes as close as thirty-five yards.

During the flight, he would keep his ears finely tuned for airborne-intercept radar signals from hostile Soviet fighters.

Raven Three was responsible for analyzing the Soviet early warning and missile guidance signals, one of the principal objectives of the mission.

Nor could their armed guards halt the continuous streams of invisible signals escaping across their borders.

Because radar signals travel in a straight line and the earth is curved, it was impossible for American radar stations outside Russia to detect air activity deep within the country.

Because high-frequency signals bounce between the earth and the ionosphere, the right equipment can pick them up thousands of miles away.