RADIO RATINGS FIGURES SKEWED BY CHANGES.(Weekend)

Byline: Will Hughes Staff writer

The final quarter of 1988 may set a record for the most format, call letter and on-air personality changes in the history of local radio.

Some local broadcasters say the changes may skew fall ratings.

Fall ratings from Birch Scarborough Research, released today,

show some surprises and some consistency.

WPYX-FM (106.5) retains the top position in listeners, 12 years and older, with a 13.9 rating. WFLY-FM (92.5) is second with a 10.1 and WGY- AM (810) is third with an 8.8.

A surprisingly strong 6.9 - up from a 5.3 last fall - propelled WTRY-AM (980) into fourth place, the oldies station's …