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Author Topic: Feed line over 50ft  (Read 2929 times)
K5LXP
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« Reply #15 on: September 30, 2012, 08:22:16 PM »


I'd bet the BNC to F connectors use 75 ohm BNC's.  Just be aware that they're not directly interchangeable with 50 ohm BNC's.


Mark K5LXP
Albuquerque, NM
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WB6BYU
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Posts: 13336




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« Reply #16 on: October 01, 2012, 12:28:23 PM »

The inner pin on a 50 ohm BNC is slightly larger than that on a 75 ohm plug.

If you regularly use a 50 ohm plug in a 75 ohm jack, it may stretch out the
contacts in the jack so they no longer work reliably with a 75 ohm plug.

A 75 ohm plug in a 50 ohm jack may not make reliable contact if the center
contacts are worn or spread somewhat, even if a 50 ohm plug works.

I regularly use both types interchangeably with few problems.  If I had an
expensive piece of equipment with a 75 ohm jack I wouldn't want to use it
with 50 ohm plugs, but for an adaptor that is only going to be used with
a 50 ohm plug, I wouldn't worry about it.

[edited to add]
I've had more contact issues with BNC plugs where the center conductor has
been pushed too far in than from using a 75 ohm plug in a 50 ohm jack.
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