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04-12-2021, 04:07 PM
Hi Guys
50R and 75R cable is what the impedance is at RF. Cable is often simulated using a ladder where the rungs are capacitors and the legs are resistors. At AF you only need to look at the capacitance.
Audio signals are infinitesimally small currents at often quite low voltage, so thin inner conductor is fine - really any gauge is good. I use #24 just because it was what was available at low cost from my supplier back in the '80s. (shaky voice) "Back in my day..." #30 is totally fine but just needs a bit more care.
Avoid steel braids and wire as steel will add harmonic distortion. Oxygen-free copper? Not worth the mark-up in price but if it is otherwise what you want, like or can afford, then fine.Foil shields are supposed to be good as electrostatic screens but the drain wire is the lowest resistance path for the signal. Spiral and braided shields have their application - spiral being easier to work with but offers lower shielding.
1-conductor, 2-conductor - use what fits or that you can get a good price on.
There is a discussion of wire in another thread here, and RG174 was mentioned there, as well. Someone suggested wire from an aviation supply place that looked pretty nice but is a bit expensive.
TUT3 discusses wire and coax and shows how to deal with braided shields.
Have fun
50R and 75R cable is what the impedance is at RF. Cable is often simulated using a ladder where the rungs are capacitors and the legs are resistors. At AF you only need to look at the capacitance.
Audio signals are infinitesimally small currents at often quite low voltage, so thin inner conductor is fine - really any gauge is good. I use #24 just because it was what was available at low cost from my supplier back in the '80s. (shaky voice) "Back in my day..." #30 is totally fine but just needs a bit more care.
Avoid steel braids and wire as steel will add harmonic distortion. Oxygen-free copper? Not worth the mark-up in price but if it is otherwise what you want, like or can afford, then fine.Foil shields are supposed to be good as electrostatic screens but the drain wire is the lowest resistance path for the signal. Spiral and braided shields have their application - spiral being easier to work with but offers lower shielding.
1-conductor, 2-conductor - use what fits or that you can get a good price on.
There is a discussion of wire in another thread here, and RG174 was mentioned there, as well. Someone suggested wire from an aviation supply place that looked pretty nice but is a bit expensive.
TUT3 discusses wire and coax and shows how to deal with braided shields.
Have fun
