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Author Topic: LMR-400 vs. LMR-400-F  (Read 638 times)
KI6DYR
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Posts: 227




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« on: April 04, 2008, 09:29:47 PM »

I am curious about LMR-400 and 400-F. LMR-400 is a single solid center conductor while the F is stranded.

I use LMR-400 here in the mountains primarily because 9913 is a bad choice in snow country, as are other air dielectrics. I use LMR-400 even on HF and this elads to my question.

Given that current flows on the outside of a conductor, is the stranded LMR-400 more effective on HF than the single solid conductor of LMR-400? I realize that there is only a .1dB difference in loss with the F cable. But what about transmitting?
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K9KJM
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Posts: 2416




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« Reply #1 on: April 05, 2008, 12:37:47 AM »

LMR-400 UF with the stranded center conductor is made to flex, Like as going around a rotor......  

IF you need to go around a rotor, Get the UF version.
If not, Stick with the plain LMR-400.
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KI6DYR
Member

Posts: 227




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« Reply #2 on: April 05, 2008, 12:55:21 AM »

I'm sorry, but that was not the question. The question was whether or not the flex transfers power better at HF because of the strands rather than a solid center conductor.
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W3LK
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Posts: 5644




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« Reply #3 on: April 05, 2008, 12:04:14 PM »

There is no measurable difference, at least not with anything you are likely to have in your shack.

Much worry about nothing.

73,

Lon - W3LK
Naugatuck, Connecticut
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A smoking section in a restaurant makes as much sense as a peeing section in a swimming pool.
WB2WIK
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Posts: 20542




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« Reply #4 on: April 05, 2008, 07:58:28 PM »

Actually, for any gauge wire (circumference), a solid conductor has less loss than a stranded conductor at any radio frequency.

The specifications should reveal that: If they don't, the manufacturer is fibbing.

WB2WIK/6
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KB1LKR
Member

Posts: 1899




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« Reply #5 on: April 30, 2008, 07:01:38 PM »

"a solid conductor has less loss than a stranded conductor at any radio frequency"

Have seen this stated before, but never why this occurs, so: why? For a given AWG the stranded is (should be) same X-section, so should be same at DC to 60Hz (or even 400Hz), but what happens at HF and up?
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