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List:       elecraft
Subject:    Re: [Elecraft] Any larger or more efficient heatsinks available for the K2/100PA (radio lid/top)
From:       "David Cutter" <d.cutter () ntlworld ! com>
Date:       2014-09-28 22:50:38
Message-ID: 59128C8C343E4E118658EE4133F9F128 () toshibauser
[Download RAW message or body]

You could try 2 x 12V fans in series to give a bigger cooling area but 
smaller current; I did this once on a noise-critical application.

In terms of S units at the other end, turning down the power, say 25% makes 
sense.

David
G3UNA



> I run a 4" (120mm) computer case fan that the specs say draws all of .15 
> amps, 1.8 watts @ 12V, at full speed.
> It probably doesn't need to turn that fast to adequately cool the heat 
> sink so the current draw could be much less.
> .15A or less current draw for a fan is insignificant, IMO, compared to the 
> 20A the rig draws on transmit.
> If you want to save some battery turn the power down or decrease the duty 
> cycle.

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