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BLN-3010 - E1 passive impedance adapter 75 ohm 1.6/5.6 jack female to 120ohm twisted pair
75 to 120 Ohm Balun 1.6/5.6 M JACK ( IMPEDANCE ADAPTER )
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Amazon.com: CTCUnion Balun-PS - E1 Passive impedance Adapter 75 ohm Dual BNC Male Pigtails to 120ohm Twisted Pair : Electronics