1. Forum
  2. FIDO
  3. HAM

  • Removing resin from sealed 49:1 unun box

    From Boris Gonev@2:240/8001 to All on Wed Jun 18 21:24:03 2025
    Hi All,

    After I do not know how many years, I'm back on FidoNet
    So, back to the primary topic:
    Recently I've purchased a 49:1 unun from a manufacturer, but I am not satisfied of it's performance (compared with another 49:1 transformer, the SWR is notably higher). Therefore I plan to dissassemble it completely and use the ferrite for another project, but the main problem is that the ferrite inside the box is sea led with a resin. I would like to hear your opinions or experience, how to safe ly remove the resin without damaging/destroying the ferrite ?

    73 de Z32X

    --- Mystic BBS v1.12 A43 2019/03/03 (Windows/32)
    * Origin: BlackICE BBS (BlackICE.BBSindex.com:23) (2:240/8001)
  • From Rug Rat@1:135/250 to Boris Gonev on Sat Jul 5 22:44:05 2025
    On Wed 18-Jun-2025 9:24p, Boris Gonev@2:240/8001.0 wrote:
    Hi All,

    another project, but the main problem is that the ferrite inside the box
    is sea
    led with a resin. I would like to hear your opinions or experience, how to safe
    ly remove the resin without damaging/destroying the ferrite ?

    The only answer I could think to give you for your question, is to find a video on YouTube on repairing the old Commodore 64 PSU's. It is the only thing I can think of to compare it to.

    What I got from a quick search is, "Using heat, tools, or solvents to seperate the resin from the componates." So a lot of accetone and a dremmel tool?

    Sorry I could not be more help.

    Rug Rat (Brent Hendricks)
    Blog and Forums - www.catracing.org
    IMAGE BBS! 3.0 - bbs.catracing.org 6400
    C-Net Amiga BBS - bbs.catracing.org 6840
    --- CNet/5
    * Origin: The Rat's Den BBS (1:135/250)