Topband: 80m rotatable dipole load coil questions

[David Cutter]

A quick note on  a protective coating for aluminium:

You might like to look at Alocrom 1200 (Alodine 1200 outside Europe) which 
can be  hand-applied to preserve and protect aluminium from corrosion, 
retaining its conductivity.  I used it for many years in industrial and 
military applications, where it is applied more thickly but for our purposes 
it produces a pleasant gold colour.   You can mix small amounts for small 
areas that need protection.  Surfaces need to be scrupulously clean first.
Over here a 1kg kit can be purchased for around £40 including delivery.
https://www.silmid.com/products/alo1200po1-bonderite-alocrom-1200-powder-brush-kit.aspx
Here's the instruction leaflet:
https://www.silmid.com/MetaFiles/Silmid/1a/1a5a6311-ae94-457b-a635-93c06b3121bc.pdf

David, G3UNA


>> 2. Is there advantage of winding the coils of copper vs. aluminum? Is it 
>> worth silver plating the copper windings? I'm most likely planning to use 
>> 1/4" tubing either way.
> Both materials will tarnish (oxidize). Since aluminum is already oxidized, 
> I would go with it, since we are both in AZ where, until the big one, we 
> are removed from salt air. Silver plating is a waste, IMHO, and not 
> necessarily of any benefit. See: http://k6mhe.com/n7ws/Plating.pdf