The YF-51 from Cobham Signal & Control Solutions is a Power Divider with Frequency 0.5 - 2.0 GHz, Input Power 1 W. More details for YF-51 can be seen below.
YF-51 - Aeroflex Signal & Control Solutions - Datasheets360.com
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YF-51 SPECIFICATIONS ; RF/Microwave Device Type, SPLITTER AND COMBINER ; Construction, COAXIAL ; Insertion Loss-Max, 1.0 dB ; Operating Frequency-Min, 500.0 MHz.
YF-51. Frequency Range (GHz). 0.50 - 2.00. Max VSWR (In/Out). 1.40 / 1.30. Insertion Loss (dB Max). 1. Isolation (dB Min). 18. Phase Balance (degrees). 4.
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