15 ohm co-axial connectors

[lugoteehalt]

Greetings,

If co-axial connectors need a 15 ohm resistance is there some simple way of improvising connectors?

Fifins.

[bwkaz]

Do they need 15-ohm resistance, or zero resistance and 15-ohm impedance?

If the former (or if 15-ohm impedance but no requirement on zero resistance), then you can use a 15-ohm resistor. Look around at your nearest Radio Shack; they should have a pack of 2 or 5 for like fifty cents. Horribly expensive, yes, I know, but oh well.

If they need zero resistance and 15 ohms impedance, then you can create a wire loop that does that. I don't know what the frequency of BNC networking signals are (that is what you mean, right? BNC?), or what any of the impedance equations are, so I don't know how to create one, but I know it can be done.

[cowanrl]

If you're talking about the coax cable for Ethernet, it requires a 50 ohm terminator, not 15 ohm.
I have one of the 50 ohm terminators here and it actually measures 50 ohms resistance. I have no way of measuring it's impedance at 10mbps.

Some radio transmission systems use the same impedance coax as ethernet does. To terminate it for testing, it required a purely resistive load. I think the terminators for Ethernet would be the same.

If you can't find a terminator with that was made for use with Ethernet coax, you may want to try a +-5%, 50 ohm carbon resistor. Make sure it's not a wire wound resistor.
Since ethernet uses very low power, it wouldn't have to be a big resistor.

[lugoteehalt]

Thanks!

The thing I read said resistance, so i'll assume ohms not gauses or whatever they're called.

[michaelk]

Yes, its 50 ohm resistance.

1/8 watt or 1/4 watt will work. You need a BNC connector and solder the resister between the shield and center conductor. If you don't have any soldering skills its best to buy one.