[time-nuts] LPRO-101

[Glenn Little WB4UIV]

My heatsink appears to have a thermal resistance of about 3 degrees C per watt.
It is similar to Thermalloy 60975.

I will dig deeper into the junk box and see if I can find a heatsink 
with larger fins.

Thanks for the guidance.

73
Glenn
WB4UIV


At 11:50 PM 1/11/2009, you wrote:
>Glenn Little WB4UIV wrote:
> > I have a LPRO-101. Before I power it up, I have been advised to 
> use a heatsink.
> > How large of a heatsink do I need?
> > I found an extruded heatsink in the junk box.
> > This heatsink has fins about 0.50 inches high.
> > The width is 2.375 inches wide.
> > It is 8.125 inches long.
> > I plan to cut this heatsink in half giving me two 4.0 inch pieced.
> > I plan to bolt each piece to the bottom of the LPRO-101, using the
> > six mounting holes, three per heatsink.
> > Would this be sufficient heatsink?
> >
> > Thanks in advance.
> > 73
> > Glenn
> > WB4UIV
> >
> >
> >
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> >
>Glenn
>
>The manual recommends a heat sink with a thermal resistance of 2C/watt
>or less for ambient temperatures up to 50C.
>Your proposed heatsink may be a little small unless you bow it.
>
>Fin orientation is very important for an non blown heatsink.
>If you just attach the heatsink to the base with the fins pointing down
>the thermal resistance will be increased significantly over the normal
>orientation with convection cooling.
>
>Bruce
>
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