Soldering 1.2mm pins onto coax cable

I used to solder on a much larger scale, forklift battery terminals so the method was slightly different, I used a gas welding rig :mrgreen:

The current issue is making up repair sections for 2.8 and 3.3mm coax car antenna cable with a 1.2mm pin, rather than crimp it as finding the correct die is quite hard I noticed it has the hole in the side to solder it the same as this guide

The question is what do I use to effective solder it, normally I would just tin the coax but I wan't to avoid melting the dielectric so I assume the best method is filling the tip with solder, if anyone has done this before what do you do, stick a strand of solder in the tip and use hot air soldering then plunge the coax in or is there a preferred method?

I am trying to avoid trial and error as the connectors are not cheap!

Thanks.

Looks like you can assemble dry then apply heat to the pin with a soldering iron and apply solder to the solder hole? Assuming suitable heating the solder should flow straight in and wick along the length of the pin via capillary action. Shouldn't need to pre-tin if the conductors are clean.

Crimp is probably best, but as you say, matching die to plug can be tricky and the dies aren’t cheap!

If the pin is hollow, a small piece (<2mm) or cored solder can be dropped into the pin, then the copper centre core pushed down onto the solder.

Invert the whole thing so the pin is uppermost and apply the soldering iron to the pin (so you heat both pin and copper). The solder melts and the pin drops onto the copper wire. A hot iron with minimal contact time is required to avoid damaging the dielectric. Ideally there should be no copper showing, the end of the pin should be flush with the dielectric. Use a fine tip on the iron.

Is it that simple?
I never thought of that :shocked2:

*add's 0.3mm solder to ebay basket

*edit, I didn't see your post Peter, also a great idea but it won't be possible for one of the connections as you have about 4 inch hanging from the roof lining. I could hold them with tweezers and push up with the iron though :)