[Elecraft] KPA1500 not amplifying

[Don Wilhelm]

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.
>