1306 GMT - The Swiss franc could fall against the dollar if the Federal Reserve raises interest rates and Fed Chair Kevin Warsh hints at possible further policy tightening later, Societe Generale's Kit Juckes says in a note. Switerzland's low interest rates mean the franc could suffer versus the dollar in carry trades where investors use low yielding currencies to buy higher-yielding currencies, he says. The Fed announces its decision at 1800 GMT. The dollar falls 0.1% to 0.8183 francs after reaching a six-week high of 0.8198 Tuesday, according to LSEG.