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What where the old pigtail connectors to TVs? Was that 300 ohm to 75 ohm?
by dillonmckay 7y ago
What where the old pigtail connectors to TVs?
Was that 300 ohm to 75 ohm?
- dsr_ 7y agoYes -- the ones with two flat spade connectors on one side of a box, and a coaxial screw-in connector on the other.
- Pick-A-Hill2019 7y agoShort answer, yes. Techie answer is that 75 ohms is best for receiving signals. For air dielectric coax, 77 ohms provides the lowest loss of signal. '...the standard coax impedances is 75 ohms because that is the impedance you end up with after you run a 300 ohm 1/2 wave folded dipole impedance through a classic 4:1 hairpin balun. You've got folded dipole, you gotta have a balun, and baluns don't come any simpler than the hairpin balun (and there isn't any easy way to get to 50 ohms from 300 ohms)'. Modern (US) coax cable is foam filled PTFE which works best at 50 ohms.