A well designed output stage SHOULD be hot to the touch. The temperature
component of protection in Elecraft output stages seems to kick in when
the internal temperature approaches 70 deg C. You can see this, for
example, by watching temperature in the KPA500 and listening to fan
speed. The function of the heat sink is to act as a conductor between
the semiconductor junctions and the surrounding environment, and
increased mass acts as a sort of buffer.
73, Jim K9YC
On 8/5/2017 2:53 PM, Jan wrote:
""I've been doing a lot of FT-8 using my KX3 and my KXPA100 at 20 watts,
and have noticed that the KX3 is heating up quite a bit and is almost
hot to the touch""
Why should the KX3 be heating up, when the AMP is running only 20W ?
Is the KX3 "drive" not backed-down at this level ?? HELP
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