At Redskin Park, there was calm outside the fences and a measure of confusion inside the gates as the two separate teams of Washington Redskins observed the fourth day of the NFL players' strike.

While the striking players picketed without incident, the replacement Redskins watched one quarterback -- Tony Robinson -- leave for a hearing in the office of NFL Commissioner Pete Rozelle, another quarterback -- Ed Rubbert -- return to the team after leaving two days ago and a third quarterback -- a fellow named Kevin Sisk -- join the 58-man roster.

"This would probably be more traumatic if it were happening in two or three weeks," Coach Joe Gibbs said yesterday. "I think right now, everybody still is reeling {from the events of the week}."

With their first game only eight days away, the replacement Redskins are going through an unexpectedly turbulent time at the most important position on the roster. Robinson, who became the team's top quarterback when Rubbert left Wednesday night, attended a hearing with Rozelle to seek permission to play in the NFL after his conviction on a drug-related charge last year. He will not be able to practice with the team until Rozelle announces his decision.

Robinson, once a star quarterback at Tennessee, pleaded no contest last November to charges of attempting to deliver cocaine and was sentenced to six years in prison, but was put on probation for all but 90 days. He had originally faced 22 felony charges that could have landed him in prison for life.

Shortly after being sentenced to the Knox County (Tenn.) Penal Farm, a minimum security facility, he applied for work release. He later violated the conditions of his work release by not going to work at his landscaping job for one day, and was sentenced to an extra six months at the penal farm and an extra year of probation.

In May, however, Robinson was allowed to interrupt his sentence to play football for the semipro Richmond Ravens. He played eight games for them before receiving a call from the Redskins to join their replacement team. The Redskins signed four players from that Richmond team, which runs an offense similar to the Redskins'.

On May 18, Rozelle issued a directive to all NFL teams stating that Robinson could be signed, but before his contract would be approved by the commissioner's office, Rozelle would have to review Robinson's situation. That is what happened today, said league spokesman Dick Maxwell.

Rozelle is expected to issue his decision sometime next week on whether Robinson can play for the Redskins.

"You'd like to have him practice as soon as possible," Gibbs said. "We talked to all of his coaches, his college coaches, the coaches who recruited him, and they all thought he was a good guy. He's a guy who made a mistake.

"Originally, we knew there would be publicity about this and we thought maybe we shouldn't {sign him}. But then we thought this might be his only opportunity to redeem himself, his life and his football career. Maybe this will give him a chance to get his life going in the right direction."

Robinson, who threw for 3,332 yards in college, was the Volunteers' starting quarterback in 1984 and for most of 1985, when he suffered a season-ending knee injury against Alabama. He did not play at all last season after being arrested in January 1986.

Robinson, who must return to the penal farm after the football season, has not spoken to reporters since arriving Tuesday.

Rubbert also isn't talking right now after his abrupt return to the Redskins. The team's fourth-string quarterback in training camp, Rubbert was running the plays with the first team on the first day of practice Wednesday, then left that night, saying he had changed his mind and didn't want to cross the picket line. But he called Gibbs the next day and said he "changed his mind" and wanted to come back, Gibbs said, and he was back at practice yesterday.

This was good news for the Redskins. Rubbert, a three-year starter who threw for 5,496 yards at the University of Louisville, knows the team's offensive system better than anyone else on the practice field, and likely would start for Washington Oct. 4 against St. Louis at RFK Stadium.

With all this upheavel at quarterback, the Redskins signed Sisk, who played at Murray State in Kentucky and was a graduate assistant coach last season. They also have Jack Stanley, who played two seasons for Nevada-Reno, and is the only quarterback to participate in every practice so far this week.

Under normal circumstances, changes of this nature would be chaotic for a professional football team. But these are not normal circumstances.

"I think our guys here right now are a pretty resilient group," Gibbs said. "They took Ed's leaving and bounced right back. They took Tony's leaving and bounced right back. Now Ed's back, and they took that in stride, too."

The striking Redskins, meanwhile, spent a quiet day in the sun. There were fewer players than the day before and there was less noise on the picket line. Player representative Neal Olkewicz said the players would be taking the weekend off from the picket line, to reassemble in shifts Monday morning to continue their picketing.

Redskins Notes: Of the 58 players, 55 practiced. Missing were Robinson and two linebackers, Tony Settles and Carlton Rose, who are expected Saturday.