# About RF SMA-M to SMA-M cable

**URL:** <https://www.ruby-forum.com/t/about-rf-sma-m-to-sma-m-cable/201938>\
**Category:** GNU Radio\
**Created:** [January 18, 2011, 12:19pm UTC](https://www.ruby-forum.com/t/about-rf-sma-m-to-sma-m-cable/201938 "2011-01-18T12:19:59Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![dubstep](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/d/cdc98d/32.png) [@dubstep](https://www.ruby-forum.com/u/dubstep)\
**Post date:** [January 18, 2011, 12:19pm UTC](https://www.ruby-forum.com/t/about-rf-sma-m-to-sma-m-cable/201938/1 "2011-01-18T12:19:59Z")

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Does this cable have shielding capability?

I need a cable that shields external signal in 400-500MHz

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**Author:** ![Songsong\_G](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/s/49beb7/32.png) [@Songsong\_G](https://www.ruby-forum.com/u/Songsong_G)\
**Post date:** [January 18, 2011, 2:37pm UTC](https://www.ruby-forum.com/t/about-rf-sma-m-to-sma-m-cable/201938/2 "2011-01-18T14:37:38Z")

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Yes, according to the photo it is a coaxial cable, which by definition  
includes shielding, see

> **[Coaxial cable](https://en.wikipedia.org/wiki/Coaxial_cable)**
>
> Coaxial cable, or coax (pronounced /ˈkoʊ.æks/) is a type of electrical cable consisting of an inner conductor surrounded by a concentric conducting shield, with the two separated by a dielectric (insulating material); many coaxial cables also have a protective outer sheath or jacket. The term coaxial refers to the inner conductor and the outer shield sharing a geometric axis.
> Coaxial cable is a type of transmission line, used to carry high-frequency electrical signals with low losses. It is u...

The shielding insulates from external interference, much like a  
Faraday cage; however, it doesn’t work as a frequency selective  
filter, nor is it a perfect insulator.

Alex

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**Author:** ![Songsong\_G](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/s/49beb7/32.png) [@Songsong\_G](https://www.ruby-forum.com/u/Songsong_G)\
**Post date:** [January 18, 2011, 1:41pm UTC](https://www.ruby-forum.com/t/about-rf-sma-m-to-sma-m-cable/201938/3 "2011-01-18T13:41:03Z")

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Sorry I didn’t say in detail.

I mean SMA-M to SMA-M cable in ettus website.

If it cannot shield external signal of 400-500MHz band,

Could you give me a suggestion?

---------- Forwarded message ----------  
From: Songsong G. [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid)  
Date: 2011/1/18  
Subject: about RF SMA-M to SMA-M cable  
To: gnuradio mailing list [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid)

Does this cable have shielding capability?

I need a cable that shields external signal in 400-500MHz

–  
Seokseong Jeon (aka Songsong G.)

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<div class="post-metadata">

**Author:** ![Songsong\_G](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/s/49beb7/32.png) [@Songsong\_G](https://www.ruby-forum.com/u/Songsong_G)\
**Post date:** [January 18, 2011, 10:52pm UTC](https://www.ruby-forum.com/t/about-rf-sma-m-to-sma-m-cable/201938/4 "2011-01-18T22:52:11Z")

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> Does this cable have shielding capability?
> 
> I need a cable that shields external signal in 400-500MHz
> 
> –  
> Seokseong Jeon (aka Songsong G.)

All coaxial cables have roughly 90dB of isolation or more. The aren’t  
particularly frequency-dependant  
except that the loss goes up in a linear fashion with frequency.

–  
Principal Investigator  
Shirleys Bay Radio Astronomy Consortium

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