[ARC5] Tropical Coating -MFP

[Kenneth G. Gordon]

On 21 Feb 2010 at 13:01, WA5CAB at cs.com wrote:

> Ken,
> 
> I think that the thread ran on the MILSURPLUS list.

Yes. You're correct, Robert. Thanks. :-)

>  But in any case,
> I don't recall it being mentioned that in certain sets 60-70 years on,
> it can cause problems due to acting as capacitors to ground.

No. That wasn't metioned there. But you're right. I have experienced 
its deleterious effects.

>  I just
> (almost) finished repairing a BC-611-F.  In general, any point in the
> circuit of that thing that should show open or at least greater than
> 5.7 megohms to ground reads about 5 megohms on a Simpson 260.

On a Simpson 260 indicates that the resistance is pretty "low" all 
right.

>  Several
> other heavily MFP coated units (model letter unimportant) have had to
> have the next higher frequency antenna coil installed before the
> antenna tuning would peak properly.

Sounds like much the same thing I have experienced. 

Ken W7EKB