Soviet Communist Party leader Leonid Brezhnev, will visit West Germany for the first this week for a five-day official visit. The visit, which begins on 18 May, is being hailed in Moscow, U.S.S.R., as the beginning of a new era of cooperation between the two nations. That hope is also echoed in West Germany's capital, Bonn.

In preparation for the forthcoming visit, Bonn has mobilised 5,000 police and border troops, a fleet of helicopters, and set up street barricades -- all of which are designed to protect the safety of the Soviet leader.

Strict security precautions have also been observed at the hilltop residence of Mr. Brezhnev -- Petersbeng Hotel.

Two Communist parties are mobilising their masses for the visit here this week of the Soviet Party leader -- one to cheer, the other to jeer.

The German Communist Party (D.K.P.) describes the visit as an "historic event of greatest importance to all European nations".

The Communist Party of Germany (K.P.D.), on the other hand, says Mr. Brezhnev comes as a representative of the new Soviet "monopolistic bourgeoisie to seek confirmation of his regime's striving for hegemony in Europe".

During his stay in Bonn, Mr. Brezhnev will hold a series of talks with West Germany's Chancellor Willy Brandt. One topic which might figure in these talks is the role of Radio Free Europe and Radio Liberty.

Because of the restrictions placed on printed matter within Communist nations, Western nations including the United States have relied to a great extent on radio broadcasting s the only effective means of reaching the peoples there.

The two stations are based in Munich, West Germany, and both were created during the Cold war era. Radio Liberty is run by Soviet emigres and transmitted only to the Soviet Union, whereas Radio Free Europe has a much larger audience.

SYNOPSIS: Early this week, West Germany's capital of bonn was making final preparations for the forthcoming visit of the Soviet Union's Communist Party Leader, Leonid Brezhnev.

Newspaper headlines throughout the city are proclaiming Mr. Brezhnev's five-day official visit. And on Tuesday, West German Chancellor, willy Brandt, met with members of his own party to make preparations for Mr. Brezhnev's arrival on May 18th.

The visiting Soviet leader will stay at the Petersberg Hotel, and security at the hilltop hotel, as in other parts of Bonn, has bene very heavy. It is currently closed to all other guests.

One topic which might figure in talks between Chancellor Brandt and Mr. Brezhnev, are the international radio stations which are based in Munich, and created during the Cold War era. Radio Liberty is one of two such stations.

Staffed mostly by Russian emigres, Radio Liberty broadcasts only to the Soviet Union. Recently, it has started to broadcast "Samizdat" material...the so-called underground "Self published", manuscripts banned in the Soviet Union.

Another of the international radio stations is Radio Free Europe.

Unlike Radio Liberty, it is not staffed mainly by Russian emigres.... and it broadcasts to other Eastern European countries...not just the Soviet Union. It's news bulletins are drawn up from a wide source of information, including the official Chinese News Agency, Hsinhua.... and the Soviet Agency....Tass.

In its Tuesday news bulletin, Radio Free Europe's newscaster broadcasted news of Mr. Brezhnev's forthcoming visit to Bonn to its foreign listeners.