Using LMR-400 and or LMR-600 for a
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40 m (120 feet) remote antenna
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run would sufficiently reduce the effective RF energy at the remote antenna
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.
Here
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are the numbers: LMR-400
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ultra flex:
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30 ft at 2.
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4 GHz = 2.
...
7 db loss (
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57.8% radiated power at
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the remote antenna run)
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50 ft at 2.
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4 GHz =
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4.
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5 db loss (
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40.1% radiated power at
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the remote antenna run, this would be my pain threshold)
120 ft at 2.
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4 GHz = 8.0 db loss (16% radiated power at the remote
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antenna run, pretty much no RF available at the remote antenna run)
Here are the numbers: LMR-600:
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30 ft at 2.
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4 GHz = 1.
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5 db loss (
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74.2% radiated power at
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the remote antenna run)
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50 ft at 2.
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4 GHz = 2.
...
5 db loss (
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60.8% radiated power at
...
the remote antenna run)
120 ft at 2.
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4 GHz = 5.1 db loss (30% radiated power at the remote
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antenna run, pretty much useless for remote antennas at this length)
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Some other things to think about: LMR-400
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ultra flex coaxial cable is fairly flexible, but it can still
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be tough to work with especially if your remote antenna run is a
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temporary installation. The cable diameter is .405 inches and it uses a
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stranded center conductor which lends itself better to repeated bending and
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temporary installations.
LMR-600 low loss cable is going to be a real bear to work with. The cable diameter is approximately .590 with a solid center conductor
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so making this work with a temporary installation would be difficult.
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LMR-600 is really best suited for permanent installations. Also
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remember that the reverse TNC connectors at each end also add a minute amount of
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RF loss. See this information from Show Me cables, they can make custom
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cable lengths for LMR-400, didn’t see anything for LMR-600. Link to
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their website: http://www.showmecables.com/ As with most wireless IC users contemplating
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the use of remote antennas via coaxial cable, it is far easier to run audio
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cable than it is to run RF coaxial cable, especially at 2.
...
4 GHz where the loss adds
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up very quickly.
Note: The cable calculations were referenced from the Times Microwave online calculator. https://www.timesmicrowave.com/calculator/