OHMS?

[johnday]

Yes, I do know that an ohm is a measurement of resistance. That said, why when running a single antenae do you want a 50 ohm cable, and when running two, you want a 75 ohm? Aren't you in effect negating any advantage of the increased incoming signal?

[PharmPhail]

The effective ohms will cut the original in half when you use two. One 50 ohm is 50, but two 75 will have effectively 37.5.

[johnday]

Ah, got ya. It's the same principle as running a larger cable? Guess I should have thought a little more?

[kd5drx]

If you cut 75 ohm coax at 1/4 wave length of the freq you want times velocity factor of the coax involved usually 65 you get 50 ohms and what we call a tuning shunt so now what ever you put past that 75 ohm shunt will not be seen by the radio and think it has a perfect match. thus the reason you want to make sure your antenna are perfct before you put the 75 ohm coax on because other wise you could be talking into a resinant dummy load.
this would be 2468 devided by 27.185 then times 65% works out to about 59 inches on each side if my figures are right but its been a ton of years since i built any phase harness's.