Second that on the muffin fan. I have one sitting on top of the KPA100
heatsink, and when running 50-60 watts in long duty cycle modes (i.e. RTTY),
very seldom does the internal KPA100 fan ever need to activate.
73, de AJ4TF
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On Dec 26, 2013, at 12:06 PM, K1FFX bruce.ro...@rcn.com wrote:
I starting to use my K2/100 in two 100% key-down modes, JT-65 and PSK-31.
What should I be keeping in mind in protecting the output stage for the K2 and
for the KPA100?
I’ve used the K2/100 in RTTY and PSK31, even for contests.
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Subject: [Elecraft] [K2] Safely running 100% key-down modes
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I starting to use my K2/100 in two 100% key-down modes, JT
FWIW: I used to run RTTY on my K2/100 [AFSK into mic jack and from
headphone jack]. I put a little square of sticky-back velcro on top of
the heat sink over the part that got the warmest and used it to stick a
12VDC muffin fan down, blowing down into the heat sink. I found I could
run RTTY
I starting to use my K2/100 in two 100% key-down modes, JT-65 and PSK-31.
What
should I be keeping in mind in protecting the output stage for the K2 and
for the KPA100?
For JT-65, since it is a QRP mode, I'm running at about 5 watts, and
transmissions are
limited to about 45 seconds. So, I'm
Bruce,
The base K2 power is proportional to the power out of the KPA100 - so if
the KPA100 is running at 20 watts, the base K2 is driving at about 2 watts.
You can run 100% duty cycle transmissions safely at 35 watts, and could
probably push it to 50 watts if you provide auxiliary cooling
I run JT9 and JT65 very frequently with the K2/100. Most of the time, I
run 5 watts. If needed I'll crank it up to 20 watts, so I can assure you
it's quite safe at that power level.
When the linear kicks in the K2 drive power to the linearis
proportional, so if you are within the duty cycle
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