I think they mentioned using a copper spreader plate because of this in the
literature. The part itself, where it hits the heatsink is about 1-1/16" X
1-1/16" square. That's a good bit of concentrated heat. I would think one would
need at least a 3/8" thick top on the heatsink, maybe more so it wont heat up
as fast. The 1/4" thick types I doubt would stay cool long enough as there's
750 watts of power going into it in heat, the other 750 out to the load. If
using the 1/4" sink, one would most likely need a 1/4" thick copper plate on
top or a little thicker piece of aluminum plate. There's water cooled copper
blocks for this too.
Best,
Will
*********** REPLY SEPARATOR ***********
On 5/20/05 at 1:40 PM Dan Levin wrote:
>> Has anyone tried the ARF1505 FET in any solid state amps yet?
>
>Cooling a 750 watt point source is a major problem.
>
>One is almost certainly better off (in a ham application) using
>several smaller parts (ARF463 e.g.) - which will require more
>circuitry but will allow much easier cooling.
>
> ***dan, K6IF
>
>Join us for the California QSO Party, Oct. 1-2!
>
>
>
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