Bob,
That power ramp up is often caused by not driving the K3 with sufficient
audio.
Your audio level should be adjusted to produce 4 bars solid on the K3
ALC meter with the 5th bar flashing.
I have an article on my website www.w3fpr.com explaining the audio settings.
73,
Don W3FPR
On 11/9/2018 8:32 AM, Robert Rennard via Elecraft wrote:
Eric et al -
I performed the wattmeter calibration from page 52 of the user manual,
and then did the 5 and 50 watt TX gain calibration using the K3(s) Utility.
I notice that during the first transmission of AFSK RTTY into a Palstar
dummy load, the KPA1500 output power grows to the desired output level
in a few seconds, but in subsequent transmissions, the power level
immediately reaches the desired level. Unfortunately, I did not have the
LP-100 between the K3s and the amp.
I've been using the KPA1500 with my K3 using KEY line instead of the
KPAK cable, but not on RTTY and do not see this ramp up.
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