[Elecraft] K2 Buyers remorse

[Louandzip]

 I zip-tied two low speed 60mm muffin fans side-by-side (Globe D24-B08A-04W3-000), stuck tall rubber feet on the face of the pair and sat them atop the the K2/100 heat sink blowing down onto it. 

Lou W7HV
    On Sunday, August 8, 2021, 7:22:18 AM MDT, jerry <jerry at tr2.com> wrote:  
 
 On 2021-08-08 00:08, Matt Maguire wrote:
> The K2 works beautifully with the silent KXPA100, if you make a small
> keying circuit:

*** Good idea.  Actually, I have do have a keying circuit in my QRP K2.  
Bought
it as a kit from W8FGU.  Works perfect with my Tiny Linear project.  
The Tiny Linear
has a fan also, but not as loud.

    I am working on another linear which will have the following 
characteristics:
* 15W in, 600W out
* RF deck with a pair of MRF300 LDMOS devices
* All band switched LPF.
* Monstrous heat sink.
* Color touch screen.
* Either no fan, or the quietest fan I can figure out.  I will have to 
do it by experimentation - detailed thermal design is beyond me :).  The 
circuit is supposed to
be 70% efficient - that means that for 600W out, you put 750W in, and 
have to dissipate
150W.  I have a 1-kW RF resistor that can bolt to a backplate.  And I 
can feed it 86VAC ( for 150W dissipation) from a variac.

Getting a little off-topic here.  Sorry about that.

                - Jerry KF6VB
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