[hpsdr] Munin heat sink and spreader

[Mike Culver]

There's a difference between high conductivity and high thermal transfer. Used to be in the electrical wholesale distribution business, so sold a lot of this stuff. Which does not make me an expert by any means.

You can smooth it with fine-grained sandpaper on a block. I'd start with 180 grit and work my way to 600 grit or so. As a file + sandpaper project, you likely need to budget 2-4 hours to get it into a really good state that is still square in all the right places.

Or if you know anyone with a mill, here's the perfect application to mill it flat. 

-----Original Message-----
From: hpsdr-bounces at lists.openhpsdr.org [mailto:hpsdr-bounces at lists.openhpsdr.org] On Behalf Of AA8K73 GMail
Sent: Wednesday, October 9, 2013 7:59 PM
To: HPSDR
Subject: Re: [hpsdr] Munin heat sink and spreader

***** High Performance Software Defined Radio Discussion List *****

Thanks Mike.  From the company's datasheet:

PENETROX(r) oxide-inhibiting compounds produce low initial contact resistance, seal out air and moisture, prevent oxidation or corrosion, exhibit superior weathering characteristics, are usable over wide temperature ranges, and provide a high conductivity "gas-tight" joint.

All PENETROX(r) compounds contain homogeneously suspended metal particles. The suspended metal particles assist in penetrating thin oxide films, act as electrical "bridges" between conductor strands, aid in gripping the conductor, improve electrical conductivity and enhance the integrity of the connection.


I'm thinking that if I file the heat sink flat, it should mate with the flat copper spreader.  The spreader is very good; I can read text in its reflection and there is no distortion.

When I file the heat sink, it will be rough.  How to smooth it? 
  400 grit sandpaper?  Kitchen scouring powder?  I don't want to leave lots of little valleys.


Mike - AA8K


On 10/09/2013 10:42 PM, Mike Culver wrote:
> ***** High Performance Software Defined Radio Discussion List *****
>
> Not 100%, but isn't Penetrox for aluminum wire joints? It's a great anti-oxidant but not a great heat transfer agent.
>
> I'd vote for filing in order to address the concave issue.
>
> Mike
> WA9QHP
>
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