Jim,
There are activities other than contesting, such
as PSK31, which involve high duty cycles.
Many of us operate portable using external
batteries. Heating may be academic with the
internal batteries anyway, since the voltage
limits the power available.
Phil w7ox
On 5/3/14, 12:26 AM, Jim Brown wrote:
On 5/2/2014 5:43 PM, Don Wilhelm wrote:
IMHO, the heatsink is an improvement to the KX3
for those who do continuous duty data modes and
want to operate at power levels in excess of 5
watts.
Yes, and equipment cooling is always a good
thing. However -- note that the KXPA100 provides
power gain of 16 dB, so it takes only 2.5W from
the KX3 to get 100W out.
Another point. Even a contester who constantly
CQs doesn't transmit for more than 4-8 seconds
at a time and listens for 2 or 3 (if he doesn't
listen for at least that long, he's a poor
operator), and if he's making QSOs, the other
guy is transmitting half of the time. And RTTY
is the only keydown contesting mode. Also, the
WSJT family of keydown modes like JT65, JT9,
PSK441, and so on, transmit for 48 seconds and
listen for 72 seconds. Finally, if you're
transmitting for more than a minute or two at a
time with RTTY or PSK, the other operator is
probably bored to death with your brag tape.
To me, the value of that extra heat sink would
be to allow me to run the KX3 barefoot closer to
10W in those keydown modes. But for portable
operation, the limitation is battery, not heat.
73, Jim K9YC
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