Coax Connectors that have a teflon insulator will hold up to the heat of a soldering iron well.
Sliver plated connectors will hold up well over time.
Soldering Kit List
- ENDFED HALF WAVE KIT, $80 plus shipping. Comes with wire for 10m-40m element.
https://home.arrl.org/action/Store/Product-Details/productId/133267
- TRUSDX , $92, 80-20m XSCVR, 5W output
https://www.amazon.com/dp/B09YH2V2ZP
- Cricket 40, $32, QRP 40m CW XCSVR
http://www.4sqrp.com/cricket40.php
- KK1B straight key kit, $60
https://americanmorse.com/kk1.htm
- QRP LABS band pass filter kit, $5, available in 160-10m
https://qrp-labs.com/bpfkit.html