[Elecraft] KPA-1500 tuner power ramp up

[David Haines]

I don't know if this is useful, but I have noticed that my KXPA100 with 
ATU takes a few seconds to ramp up, or at least to light all the LED's 
up to 100W.  This happens only on the first transmit after sitting 
awhile and I just assumed that it takes a few seconds for the coils, 
etc. to warm up.  After the first TX the jump to 100W is immediate.

david
KC1DNY
in the forests of Maine

On 12/11/2021 10:29 AM, David Hachadorian wrote:
> I don't know anything about the KPA-1500, but I have seen similar 
> power ramping if I have K3/config/TX DLY set too short for my AL-1500 
> amps.  With that amp, I have to set TX DLY to 14 msec.  What happens 
> is that the K3 sees a momentary high swr before the amp relay closes, 
> and throttles back power.  Sometimes you can even see "high swr" flash 
> on the K3 display.  The power then slowly ramps up as the K3 recovers.
>
> Dave Hachadorian, K6LL
> Yuma, AZ
>
> On 12/11/2021 5:49 AM, k4mwb wrote:
>> When using the tuner only (amp on standby), ATU tune works fine, but
>> observing the PWR it ramps up slowly from 0 watts. For example K3 set
>> to 100 watts, amp on standby, press ATU tune and it takes about 15
>> seconds for the amp PWR indicator to reach 100 watts. Is this normal?
>> There is no noise from the tuner during this time.
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