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I have 3 QCX-mini transceivers that I've built for various bands, and today the center pin on the BNC antenna jack broke when I was disconnecting my antenna feedline from my 30 meter QCX-mini.? The center pin insulator along with the horizontal section of the center pin pulled right out of the BNC jack and I was surprised and disappointed?as I have never encountered this with a BNC jack before.

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Since the BNC jack has 4 ground pins and since it's a multi sided board removal of the failed BNC jack can be a difficult task.? I unsoldered the center pin from the board using my solder sucker, but removal of the solder from all 4 ground pins was very difficult and I eventually gave up trying to independently unsolder each ground pin using my soldering iron and solder sucker.

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I then got out my Weller solder gun model D550 which is a dual wattage unit (260/200 watt), I flipped the circuit board with the BNC jack upside down, I placed the solder gun tip on the shell of the BNC jack just above where the center pin is located (see picture below showing where I placed the tip of solder gun on the BNC jack shell), and I kept the solder gun on the shell of the jack using full power until I saw the solder was fluid on all 4 pins and at that point I removed the solder gun from the BNC jack and the BNC jack fell right out since the circuit board was upside down (this process worked great and I amazed myself on how simple it was).?

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I now have a new BNC jack on order from Mouser, and excited to get the rig back on the air.

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Just FYI,

Don (wd8dsb)

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Nice. ? I use similar techniques on things that are dead already, ICs with a central (often ground) pads underneath and/or where the replacement is on hand. ?

A clamp holder gives me one hand back as sometimes a bit of leverage with a screwdriver or blade is needed if the device was tightly fitting in its solder holes. ? Pre heat from below helps too in difficult cases?

Glad you succeeded!

I wonder if ChipKwik could work for those who may not have a high wattage iron.

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73, Mike KK7ER

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Yes it’s an option ..

The trouble with ChipQwik is it’s just very low temperature solder. It forms an ugly soft alloy with the original solder and allows the joints to be kept molten longer?

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All well so far. ? That mix “may” be “ok” for just adding flux and re soldering of very low powered cool area chips with little mechanical stress ?(as some mobile phone repairers will do before issuing a 30 day guarantee ) but chip kwik sensibly recommend complete removal of their solder from the board before re fitting a replacement part?

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In this case the potential mechanical stress would clearly require this process for future reliability?

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So yes if you have no powerful iron (or similar) it’s an approach but needs quite a lot of after care and board heat to prepare for replacement so it may take longer?

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On the smaller parts, I've found it cleans up very nicely with flux/solder braid and isopropyl alcohol.

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73, Mike KK7ER

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