The 125kHz RFID scanner / reader device I have, has a coil like this:
NB> Don't have a good camera handy at the moment, so had to share a cropped image from Alibaba, but the pic is very close to the one I have, mine being slightly thicker.
Now the problem is that this RFID reader has seen some abuse, and on opening it up, I figured that the 2 coil ends that were soldered to the PCB have snapped. While soldering them back, I have unfortunately broken the thin copper wires bit more, such that, I have very little free length remaining to solder them to the board.
Question now is -
If I undo one round of the coil (which BTW, seems pretty difficult, as the thin wires are stuck together pretty hard), and solder the leads back on PCB, would the reduced coil turn impact functioning of the RFID reader ?
Alternatively, if I solder 2 offboard wires (26AWG single strand copper) to the remaining tiny lengths of leads, and then solder those offboard wires back to PCBA, can it impact the functioning of the RFID reader ?
Are these thin copper wires insulated from each other by something like transparent lacquer / clear varnish ? If so, while soldering, I believe I might burn-off some of it, so can I use standard clear-varnish available at hardware stores (for woodworking), to restore the insulation layer ?