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rovil09

datasheet

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http://www.sawtech.com.cn/showpic.asp?p_id=32&path=&pname=%E6%97%A0%E7%BB%B3%E7%94%B5%E8%AF%9D%E7%94%A8%E5%A3%B0%E8%A1%A8%E9%9D%A2%E6%B3%A2%E5%8F%8C%E5%8D%95%E5%B7%A5%E5%99%A8

http://translate.google.com/translate?hl=en&sl=zh-CN&u=http://www.sawtech.com.cn/showpic.asp%3Fp_id%3D32%26path%3D%26pname%3D%25E6%2597%25A0%25E7%25BB%25B3%25E7%2594%25B5%25E8%25AF%259D%25E7%2594%25A8%25E5%25A3%25B0%25E8%25A1%25A8%25E9%259D%25A2%25E6%25B3%25A2%25E5%258F%258C%25E5%258D%2595%25E5%25B7%25A5%25E5%2599%25A8&ei=vlC4SvvyGoWEswPTg4wV&sa=X&oi=translate&resnum=1&ct=result&prev=/search%3Fq%3D%2522F45/48A%2522%26hl%3Den%26ie%3DUTF-8

F45/48A Cordless phones SAW Duplexer

Type ------------------------------- F45/48A
Center Frequency (MHz) ------------- 45.25/48.25
Out-of-Band Rejection (DB) --------- ≥ 37
REPLACEion Loss --------------------- ≤ 5
Passband Ripple (DB) --------------- ≤ 2
Temperature Coefficient ppm/℃ ------ -72
1dB Bandwidth (MHz) ---------------- ≥ 0.5
Package ---------------------------- SA01

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It's not found on Google.

It looks like a relay, I doubt you'll be able to get a datasheet for it but you can probably easily figure out the pin out using a multimeter.

If it's not a relay, then I have a feeling, it could be an IF filter, probably 455kHz.

What does the board do?

How about posting a picture of the whole board?

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