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| SMA Edge Connector 1.72mm to 1.2mm board |
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| jarez95:
Hi, I've just received my RF PCB's and noticed that the SMA edge connector doesn't quite match the thickness of the PCB (second part of the attached image), (luckily this seems to be the only issue! ;D) It is about 0.5mm too short and consequently gives the SMA edge conn some play (before soldered). The ground pad which this connects to on either side has VIA's are through hole plated to let the solder pass through and give it mechanical strength. I do not expect the SMA edge connector to be under incredible mechanical strain, but I really do not wish the pads to be lifted up or torn in anyway throughout the product lifecycle. I am just wondering what would be the best solution to have it mechanically stable and to not aesthetically look like a huge mess? * I was initially thinking two small 0.5mm pieces of Aluminium (perhaps some cut up washers) and placing them on the underside of the PCB between the edge mounted SMA. * or just simply flooding the underside with solder as I know this makes a very solid connection and could be enough to support the connector Unfortunately I do not have spare PCBs to test this theory on and I will have to instruct the assembly house what to do in this situation. I have sound experience with PCB design/debugging but I have not encountered such a situation which would require a little past knowledge of using an SMA edge connection which doesn't quite fit. Obviously, this is something that I would need to get right on the first time as making manual edits to these PCBs (after they have come back from the assembly house) is a little out of the question. The SMA Connector I have is: βJ502-NDβ β142-0701-801β Cinch Connectivity Solutions Johnson CONN SMA JACK STR 50OHM EDGE MNT I cannot replace or buy new connectors as I already have a massive stock of these. Thank you for your time reading this. Best Regards, Jarez |
| ogden:
--- Quote from: jarez95 on February 12, 2020, 03:39:21 pm ---I cannot replace or buy new connectors as I already have a massive stock of these. --- End quote --- If you can't replace connectors, then replace PCB. --- Quote ---I was initially thinking two small 0.5mm pieces of Aluminium --- End quote --- You mean copper, right? |
| jarez95:
In an ideal world I would consider it, but given that these already took a great deal of time to get made I don't think I can. I will definitely consider increasing the core size for future spins. Yes, could also be copper. I should mention that these RF boards are part of a larger system, that very likely once setup and reliably working will not be touched again (i.e SMA cables screwed/unscrewed) etc |
| ogden:
--- Quote from: jarez95 on February 12, 2020, 04:15:13 pm ---Yes, could also be copper. --- End quote --- I am saying: definitely not Aluminium! Copper or it's alloy only. You want your "hack" to be properly soldered, don't you? |
| jarez95:
Copper it is then. https://www.amazon.co.uk/pure-copper-sheet-TOOGOO-Copper/dp/B01MA0S9R6 I guess something like this will do, cut into thin slices smaller than the pad so the solder can flood around it. I guess like this it might not even be visible. |
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