* Dollar index falls 0.3 pct; weighed down by likely QE
* Fall in U.S. yields adding to pressure on greenback
* Dollar falls back vs yen after earlier spike
(Adds quote, updates prices)
By Neal Armstrong
LONDON, Nov 1 (Reuters) - The dollar fell against a basket of currencies on Monday ahead of expected further U.S. monetary easing, and fell back towards a 15-year low versus the yen after an apparently erroneous spike prompted intervention jitters.
The greenback came under pressure against most major currencies, albeit within recent ranges, as the market geared up for the Federal Reserve to step up money printing after its policy meeting on Nov. 2-3.
"The fact that the Fed will use further QE is a burden for the dollar, whatever the volume they announce," said Ulrich Leuchtmann, head of FX research at Commerzbank.
More dollar-selling is unlikely before the announcement, however, and the recent $1.37/1.41 euro/dollar range should hold for now, he added.
There is substantial event risk this week, leaving most investors sidelined, traders said. As well as the Fed, there are four other major policy decisions this week -- in Australia, the euro zone, UK and Japan -- with key U.S. jobs data due Friday.
There is also great uncertainty about how much QE the Fed will do. A recent Reuters poll found most economists expect the Fed to buy $80 to $100 billion in assets per month, with totals ranging widely from $250 billion to $2 trillion. [
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For a PDF previewing the Fed http://link.reuters.com/pyb23q
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Analysts said the market remained fairly short dollars heading into the Fed meeting but short-term players have lightened some positions, the latest CFTC data showed. [
]Some analysts believe dollar short positions have become overstretched as investors priced in aggressive Fed QE, leaving scope for a pullback for the dollar if the Fed announces QE at the lower end of expectations. Others, however, believe any QE will be negative for the dollar.
"I'm inclined to say there's a little too much negativity priced into the dollar. But dollar shorts have been pared back, which suggests people may have been scaling back their expectations regarding the size of QE," said Jeremy Stretch, currency strategist at CIBC.
By 1136 GMT, the greenback was down 0.3 percent against a basket of six currencies at 77.028 <.DXY>, while the euro <EUR=> was steady at $1.3953 after climbing to $1.4011 overnight.
The dollar was broadly under pressure after U.S. Treasury yields on Friday ahead of the Fed's policy meeting. The yield on U.S. two-year notes <US2YT=RR> fell near a record low.
DOLLAR/YEN SPIKE
After spiking more than one yen to 81.60 yen in early Asian trade, the dollar gave up its gains and slid back within sight of its 1995 record low of 79.75 yen, with talk of dollar sales related to redemptions of U.S. Treasuries weighing it down.
The dollar was close to flat at 80.39 yen <JPY=> after leaping from 80.35 yen to 81.60 yen <JPY=> very rapidly at about 0000 GMT. Before this, it had slipped to a 15-year low of 80.21.
Dealers said the spike made many suspect possible Japanese intervention, but it quickly gave up gains as talk circulated that the spike was caused by a miss-hit or technical glitch.
With the dollar close to the 80.00 yen level some see as a possible threshold for intervention, the sudden rise prompted others to jump on the move, sending the dollar even higher.
The Australian dollar <AUD=D4> was up 0.6 percent at $0.9890, buoyed by strong data from China, the biggest buyer of Australian commodities. [
]Australia's central bank is expected to leave rates on hold on Tuesday following recent below-forecast inflation data, but there is a risk of a 25 basis point hike. [
](Additional reporting by Jessica Mortimer; editing by Stephen Nisbet)