Hi Bob - I just saw your post below.
Please contact supp...@elecraft.com immediately and we'll help you figure out
what is happening. Using the KPA1500 utility to download and sending us your
KPA1500 config file is always required in cases like this and it will also help
us quickly diagnose what's up. (that file contains the full amp setup and fault
log history.) Hopefully, this may just be a cockpit error.
Also, NEVER drive the KPA1500 at 100W! That is well in excess of its fault level
and can damage the amp. Our normal max input drive level is about 61 W or so if
I recall correctly. Above that point the 1500 automatically lights the yellow
OVR light and switches on a -3 dB input attenuator. After continuous slight
drive for 10-20 secs at above this max drive level the amp will then hard fault
into standby. Never increase drive when the OVR light is on - that will only
increase the risk of damaging the amp.
OVR and the 3 dB attenuator will activate for overdrive, high reflected power,
high PA current etc. When it lights, that is a message to reduce drive and
correct the problem. Once the drive is reduced, after several seconds the OVR
light and input attenuator will turn back off.
73,
Eric
/elecraft.com/
On 10/17/2018 7:45 AM, Bob Rennard via Elecraft wrote:
I used my K3S driving my KPA1500 on Saturday during Makrothen and state QSO
parties with no issues. I have the integration cable and RG-8X for the RF path.
Sunday AM with the K3S set to 22 W, the KPA1500 was outputting 22 W more or
less, not the 750 W I expected and got the day before.
With the K3S set to 11.5 W, the KPA1500 produced about 400 W out.
With the K3S set at 100 W, and the KPA1500 in STBY, the KPA1500 power meter
read 100 W more or less.
Later in the day the situation self-healed, but the healing did not last.
Trouble shooting ideas ? The recent KPA1500 manual troubleshooting section
suggests the obvious stuff which is irrelevant.
N7WY - Bob R
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