[hpsdr] Fwd: Munin heat sink and spreader

[Phil Crosno]

I used sandpaper and a lot of elbow grease on both the heat sink and copper spreader....

Phil
N6AS

Begin forwarded message:

> From: Mike Culver <mculver at extencia.com>
> Subject: Re: [hpsdr] Munin heat sink and spreader
> Date: October 9, 2013 7:42:45 PM PDT
> To: HPSDR <hpsdr at openhpsdr.org>
> 
> ***** 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
> 
> -----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 7:36 PM
> To: HPSDR
> Subject: [hpsdr] Munin heat sink and spreader
> 
> ***** High Performance Software Defined Radio Discussion List *****
> 
> 
> Has anyone else noticed a concave surface in the heat sink in the latest Munin kit?
> 
> When I hold the copper spreader against the heat sink, it touches on the ends, but the middle portion is about 1 mm away. 
>  I could:
> 
> 
> 1. File the copper spreader and/or aluminum heat sink to get a 
> closer fit.
> 
> 2. Put the copper spreader in my arbor press and bend it to 
> conform to the heat sink.  But then it wouldn't be flat for the 
> transistors.
> 
> 3. Fill the gap with something to provide a better heat transfer 
> than air.
> 
> 4. Not worry and just screw it together.
> 
> 
> What do you think?
> 
> 
> Also, what about using Penetrox (zinc particles in petroleum) in 
> place of ordinary heat sink compound (ceramic particles in 
> silicon, I think) for the spreader/sink interface?  I've used 
> Penetrox frequently in industrial electrical work when joining 
> aluminum with copper.
> 
> 
> Mike - AA8K
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