How to Select Coaxial Cables and Triaxial Cables                    Image credit:  computercablestore.com; ehow.com; FISwiki   Coaxial cables have an inner conductor insulated by a dielectric material and then surrounded by an outer conductor that is shielded with braid or foil. Triaxial cables add an extra layer of insulation and a second conductive sheath.  Coaxial cables, or...
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Q & A on Coaxial Cables and Triaxial Cables

We asked our users for their input on Coaxial Cables and Triaxial Cables. Here are the results of 115 users familiar with Coaxial Cables and Triaxial Cables.

Who Took Our Poll? | Design Trends | Applications and Use | Features | Buying Advice

Who Took Our Poll?Top

Design TrendsTop

Q:
What new technologies are influencing coaxial or triaxial cable design?
18 answers
Answers:
Higher frequencies require more efficient coax. Also strength is becoming an issue - as companies try to reduce price, they compromise structural integrity.
~Marketing/Sales, Calgary, Canada
The influence of IT which uses CAT 5E & CAT6 cable as this can also be used instead of co-axial cable, but the only draw back is the cable length per run.
~Digitaki Levaci, General Management, Suva, Fiji
Technologies which are trying to find substitutes for copper as the main component used for coaxial cable and then offer cheaper cables for the market needs.
~Wellington Santos, Marketing/Sales, Sao Jose dos Campos, Brazil
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Q:
From your perspective, which companies are creating the most innovative coaxial or triaxial cables?
16 answers
Answers:
Andrew comscope, Belden, LS cables.
~Devendra H., Student, Mumbai, India
Radiall, Gore, Times, Belden
~Guy C, Marketing/Sales, Phoenix, AZ
Belden, Andrew and Huber Suhner
~Dave J, RF systems design engineer, Southampton, UK
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Applications and UseTop

Q:
What are some of the applications you have used coaxial or triaxial cables for?
31 answers
Answers:
RF testing for S band and X band radar transponder. Connection of board to board signals. Antennae to transceiver connection.
~Manufacturing, Houston, TX
High frequency pulse or data transmission, harsh environment power distribution using mineral insulated triaxial cables.
~Research & Development, Chatenay-Malabry, France
In the vacuum coating industry, we use triax cable to connect the power supplies to the sputtering cathodes.
~Bill B., Engineer, Holland, MI
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Q:
Please share with us any “non-standard” applications that coaxial or triaxial cables have been used for.
6 answers
Answers:
Worst application is a coaxial connection of an electromagnetically grounded accelerometer.
~Engineering, Consulting, Eindhoven, Netherlands
Power transmission in parallel with optical fiber. Digital HD camera to CCU links.
~Christian Mourier, Engineering Consultant, Le chaesnay, France
Exceptional applications ANTENNA en Microwave.
~Martin Leiva Benegas, Engineering Consultant, Neuquen, Argentina

Q:
Do you know of any disastrous mistakes that occurred due to the incorrect usage of coaxial or triaxial cables?
7 answers
Answers:
Cables broken due to lack of initial application specification (Low bending radius, use in dynamic instead of static, too high power CW burning the cables).
~Guy C, Marketing/Sales, Phoenix, AZ
Other connector at receiving end will increase the impedance mismatch, which will in-turn High VSWR and results in burning or short ckt of transmitter.
~Devendra H., Student, Mumbai, India
Frequency dependent insertion loss which blocks pre-emphasis and cable loss compensation.
~Engineering, Consulting, Eindhoven, Netherlands
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FeaturesTop

Q:
What would your design or feature "wish list" be for this product?
18 answers
Answers:
RG6 size cable optimized for 1.5 to 3 Ghz with very low loss. Standard application is: 100 Metres of RG6 cable the loss at 1.5 Ghz is ok, but above this the loss is too high, so we must use RG11 or larger cable. If you have 100 + cables then this is a problem due to size. This is my day to day system design problem. Over 100 Metres we will use Fiber instead of copper.
~Dave J, RF systems design engineer, Southampton, UK
To design and improve the attenuation for high frequencies applications and design cables which really makes it possible to carry high potency through slim cables.
~Wellington Santos, Marketing/Sales, Sao Jose dos Campos, Brazil
Smaller sized cables with capabilities to carry as much data and information as the larger size cable at the same speed and rate. With the ability to do so in longer length cable as well.
~Project Manager, Knoxville, TN
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Q:
Is there any advice you want to share with users to help them avoid common errors in selection or usage of coaxial or triaxial cables?
9 answers
Answers:
Mostly Z0 info is lacking between the inner shield and outer shield which is coaxial as well. This propagation mode needs to be dealt with as well.
~Engineering, Consulting, Eindhoven, Netherlands
Supply a description of the application to allow the cable specialists to define the most appropriate answer.
~Guy C, Marketing/Sales, Phoenix, AZ
Availability of connectors is important to select cables.
~Satoshi Konishi, General Management, Tokyo, Japan
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Buying AdviceTop

Q:
Do you have any advice for people relative to buying or using coaxial or triaxial cables?
10 answers
Answers:
Don't rely on data. Perform sample measurements yourself. Consider the SI while including the connectors as well as the pre-emphasis and loss equalization in the cable selection process.
~Engineering, Consulting, Eindhoven, Netherlands
Make sure you buy the right cable that is designed for the particular purpose of what you are going to use the cable for. Eg: For Television - use RG59 Dual or Quadshield, not RG58.
~Digitaki Levaci, General Management, Suva, Fiji
Good luck finding any 8 gauge triax at any price - - - unless you are willing to buy about 3000 feet of it.
~Bill B., Engineer, Holland, MI
To be aware about the technology involved in the product and escaping from fake datasheets which promote some parameters performance in real live environments.
~Wellington Santos, Marketing/Sales, Sao Jose dos Campos, Brazil
Check metals used in copper & manufacturing process of cables.
~Devendra H., Student, Mumbai, India
Don't forget to purchase quad connectors if using quad shield.
~Data / Comm's technician, Richland, WA
Pay for quality. Low cost = low performance.
~Dave J, RF systems design engineer, Southampton, UK
Sample availability before production.
~Satoshi Konishi, General Management, Tokyo, Japan
Specification and trialling
~Rex M, Purchaser, Tomago, Australia
Must check specs.
~Narayan G, Manufacturer, Hyderabad, India


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