* Q2 EPS $0.22 vs est $0.19
* Q2 rev up 23 pct to $55.5 mln
* Sees Q3 GAAP EPS $0.16-$0.18
* Sees Q3 rev $58-$60 mln
* Shrs up 7 pct after market
Jan 25 (Reuters) - Mercury Computer Systems (MRCY.O) posted a better-than-expected quarterly profit, helped mainly by increased revenue from its defence customers.
Net income for the second quarter was $5.2 million, or 22 cents a share, compared with $1.9 million, or 9 cents a share a year ago.
Analysts on average were expecting earnings of 19 cents a share, according to Thomson Reuters I/B/E/S.
Revenue rose 23 percent to $55.5 million. Analysts were expecting $54.6 million.
For the third quarter, the company forecast earnings of 16-18 cents a share, on revenue of $58-$60 million.
Shares of the Chelmsford, Massachussets-based company were up 7 percent in trading after the bell. They closed at $17.84 on Tuesday on Nasdaq. (Reporting by Mayuresh Tungare in Bangalore; Editing by Don Sebastian)