At 09:05 AM 07/16/07, you wrote: >You have to lap the heat sink on the brick flat for impedence reasons. >You still have to use heat sink compound to fill the gaps for thermal >transfer reasons. It would also be nice to perfect the surface on the >recycled Mastr II or Micor chassis to 50 um smoothness, but that would >require a machine shop. > >The Science Behind It: >http://www.downeastmicrowave.com/PDF/MOSFET%20PA_pdf.PDF > >The Power brick can be resurfaced by hand with sand paper and a piece >of glass, I have done it, but I got metal poisoning for not wearing >gloves or a dust mask. > >If any has ever owned a Yaesu FT-5100 or any radio that uses a SAV-27 >brick, they will understand the importance of having smooth and even >surfaces when the substrate cracks in the brick and the module needs >resoldering.
Likewise the S-AV17 <http://www.repeater-builder.com/kenwood/s-av17-repair.html>
