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6 comments
Anonymous Poster

Need reliable way to terminate an RG-178B coax cable to a PCB

10/16/2006 11:08 PM

Hi,

I would like to terminate an RG-178B (1.8 mm OD) coaxial RF cable to a PCB. The requirements are:

* easily repeatable in a high volume manufacturing process

* board is SMT

* RF frequency is 915 mHz

*need excellent impedance matchine to ensure low VSWR

* low cost

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Guru
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#1

Re: Need reliable way to terminate an RG-178B coax cable to a PCB

10/17/2006 6:52 AM

Open up a HAM radio or other 2-way radio and see what they do.

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Guru
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Join Date: Jun 2006
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#2
In reply to #1

Re: Need reliable way to terminate an RG-178B coax cable to a PCB

10/18/2006 12:58 AM

so you need to join it to a surface stripline.

http://obiwan.cs.ndsu.nodak.edu/~ekhan/mes/

http://obiwan.cs.ndsu.nodak.edu/~ekhan/mes/programs/strip.htm and couple that with either a connector or a direct solder connection

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Guru
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#3

Re: Need reliable way to terminate an RG-178B coax cable to a PCB

10/18/2006 7:39 AM

Hi

Look at Raychem corp. website. They use to have a what they call a "solder sleeve". It is first soldered to both the outer and inner conductors simultaneously outside the board using heat gun or IR soldering fixture, and than to the PCB. Z matching can only be described as "good" , but not excellent. The point is it is very easily done, repeatable and repairable. and not too expensive. your other choice of course is using PCB connectors, but you know about them obviously.

Wangito.

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Guru
Hobbies - HAM Radio - CE3AM....4X4SW....CE3NSW

Join Date: Aug 2006
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Good Answers: 7
#4

Re: Need reliable way to terminate an RG-178B coax cable to a PCB

10/18/2006 7:46 AM

Forgot to add, Carpenter has excellent rotary strippers that are not too expensive for these coaxial cables, especially if you talk relatively high volume. These creatures are rather difficult to hand strip reliably.

Wangito

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Anonymous Poster
#5

Re: Need reliable way to terminate an RG-178B coax cable to a PCB

11/15/2006 4:52 PM

Hi,

I would like to terminate an RG-178B (1.8 mm OD) coaxial RF cable to a PCB. The requirements are:

* easily repeatable in a high volume manufacturing process

* board is SMT


Did you ever find a reliable cost effective solution to this problem. We have a application where the coax cable is terminated in ultra small coax connectors and the receptacle is surface mounted. This is a problem because it is very difficult to mate the plug and receptacle, and the connection is not reliable. We have to glue around the connection to add strength so it does not become separated later in our process. Any help on this issue would be greatly appreciated.

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Participant

Join Date: Dec 2006
Posts: 3
#6
In reply to #5

Re: Need reliable way to terminate an RG-178B coax cable to a PCB

12/05/2006 7:28 AM

It seems to me that you could use rf coaxial interface type MMCX or MCX. There are surface mount receptacle for the PCB and plug for the coaxial cable RG178.

Often receptacle are in tape and reel packing for pick and place machine.

courtoisy

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Previous in Forum: I am looking for a small.....very small pushbutton switch   Next in Forum: Electric Heat Tracing Design and Engineering
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