[Elecraft] Some KPA100 ?s...

[John Grebenkemper, KI6WX]

John;
The K2/100 works at full power (about 110 watts) at 24.9 MHz and 28.0 MHz
(I've run mine at both of these frequencies at full power into a dummy
load).

When the KPA100 is built in the EC2 enclosure, you have to use the KIO2 to
send data to the KPA100 to control it.  This means that  you need a KIO2
option in your K2 to communicate with the KIO2 that is contained in the
KPA100.  There is already one discussion of how to do this at
http://www.fidalgo.net/~wa7gxd/k2kpa100.html

The transmit time at 40 watts for running a digital mode should be longer
than you are likely to want to keep typing; I will try to run some
experiments tomorrow in PSK31.  At 100 watts, the heat sink stays relatively
cool in CW or SSB.  I ran some tests at 100 watts output for several minutes
and this increased the temperature of the heat sink up to 45C, but it could
get considerably warmer without any problems.  The fan does not cool the
heat sink; the fan primarily serves to cool the interior of the K2 so it
doesn't get too hot.

-John
 KI6WX

> Greetings fellow Elecrafters,
>
> The blurb on the Elecraft website sez that the K2/KPA100 is limited to 10w
> between 25 MHz and 29 MHz... will us licensed amateurs be able to modify
our
> KPA100s so this is not a limitation?
>
> Another question... say one has the KPA100 built in an EC2.  There are two
> RS-232 interfaces... can these be hooked up to two separate computers and
> can commands be sent by either computer with output strings being sent on
> both interfaces?  Hmmm... I can see a remote LCD display being built....
>
> Also... saw the question about max power during high-duty cycle modes
(RTTY)
> being 40w.  What is the max transmit time at this power on such modes if
the
> fan is running?  What is the max transmit time @ 100w?
>
>
> John Clifford KD7KGX
>