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Flexible antenne cables


pvanstry

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  • 4 years later...
On 8/22/2015 at 8:35 AM, soundtrane said:

Gordon Moore - Lectro Pres had a perspective on NOT using RG58 but 75 ohm cable with much lesser loss per foot. and it's flexible... on facebook... 

there's some LMR ultraflex cable, google for it... 

 

I know it's an old thread, but this caught my eye while researching different coax cables for antennas. Is this correct? I have always thought that 50 Ohm cable is the way to go....??

 

On that note, say one was to run a 100ft antenna cable with a powered distro, would a 75 Ohm cable be ok to use?

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Thanks drpro . But those are both 50 ohm cables. I should have clarified that what I was specifically wondering about in the above quote was the statement that it’s better to use a 75 ohm cable to achieve less signal loss. In my mind, I would think more resistance would equal more loss...? But, if Gordon says so, I would assume that I’m wrong. Or am I simply missing something?

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5 minutes ago, karlw said:

Here's a post from Henry Cohen (one of the RF gurus we know - but more in the entertainment/live side of the business) regarding using 75 Ohm coax for wireless mic systems:

 

http://www.alexfernie.com/Blog/files/fb2da73c042405c1cfad17e91b1e51f8-50.php

 

-Karl

 

Thanks, Karl !!

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8 hours ago, karlw said:

Here's a post from Henry Cohen (one of the RF gurus we know - but more in the entertainment/live side of the business) regarding using 75 Ohm coax for wireless mic systems:

 

http://www.alexfernie.com/Blog/files/fb2da73c042405c1cfad17e91b1e51f8-50.php

 

-Karl

Surely this applies to short runs? 

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This paper was helpful to me and addresses (at least to a small degree) the long run/short run nature of the question:

 

http://audiosystemsgroup.com/Which_Coax_for_Wireless_Mics.pdf

 

In short, the loss from mismatch is a one-time loss, where cable loss accumulates over distance.  Thus, for short runs the mismatch loss is more significant (but still quite small).  But for long runs, definitely the cable loss far outweighs the mismatch loss.

 

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