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Tips for soldering coaxial cable to PCB
Tips for soldering coaxial cable to PCB
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Old 11th December 2017, 05:18 PM   #1
Hogwild is offline Hogwild  Canada
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Default Tips for soldering coaxial cable to PCB

Hi everyone:

I'm trying to replace the standard input wires I used for my Chipamp.com LM3886 boards with some shielded coaxial cable I have here. I'm

I'm not quite clear, and I couldn't find much on the Web on how to solder these things onto the board pads (both physically and electronically). Do you try to solder the center conductor as close as possible to the board? How do you prevent more sheathing from unravelling once you've soldered the sheathing down. Do people use some sort of heatshrink or sleeving for this?

Electronically, some websites suggest you should only solder down the sheathing at one end? How does that complete a circuit to make sound? Is this the right or wrong way to do it?

Thanks
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Old 11th December 2017, 05:29 PM   #2
scottjoplin is offline scottjoplin  Wales
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It may be simpler to use PCB pins rather than pass the wires through the holes. Tin the exposed sheathing so it becomes one mass. You are right the sheathing must be connected at both ends to complete the circuit
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Old 11th December 2017, 05:38 PM   #3
rayma is offline rayma  United States
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Quote:
Originally Posted by Hogwild View Post
I couldn't find much on the Web on how to solder these things onto the board pads (both physically
and electronically). Do you try to solder the center conductor as close as possible to the board?
Try to keep the loop between the center conductor and the twisted shield as small as possible.
The foam dielectric will tend to melt when soldering, so bend the cable to relieve stress before
soldering. The best method is a pcb mount socket, and a cable with a connector installed.
BNC Female Chassis Mount Connector | TriangleCables.com
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Old 11th December 2017, 06:35 PM   #4
Hogwild is offline Hogwild  Canada
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I like the PCB pins idea a lot. How do I know what size/shape to buy? Do I got buy pad size? Hole size?

Rayma: Why is it a good idea to keep the center conductor and the sheathing close to each other? How do I do that and keep each one insulated from the other without a ton of trouble/work?
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Old 11th December 2017, 06:47 PM   #5
scottjoplin is offline scottjoplin  Wales
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Something similar to these, size to fit the hole Pack of PCB Solder In Take Off Pins AKA Vero Pins Single & Double Sided PCVP | eBay I've used short pieces of thick wire before now, but the beauty of these pins is they have ridges to hold them firmly in the board so they don't move when you solder the wire to them
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Old 11th December 2017, 06:52 PM   #6
JPS64 is offline JPS64  Germany
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Tips for soldering coaxial cable to PCB
Coax Cable Termination in Harnessing | TE Connectivity

JP
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Old 11th December 2017, 08:49 PM   #7
Hogwild is offline Hogwild  Canada
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Scott:

Thanks. I'd rather not wait until something comes to my door across borders. Is there a way to know what size to use by looking at the PCB /pads?
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Old 12th December 2017, 01:07 AM   #8
Hogwild is offline Hogwild  Canada
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Or maybe I should ask, does anyone know the diameter of those holes on the chipamp.com board?
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