As I recall, when I got one of the first KPA500 kits available, it was
also important to note the HV under load... I'd have to dig through
ancient notes to see what the allowed window should be... or it may be
in the manual.
That points to the usable power of the house supply circuit; more so in
old wiring that might not be adequate for such a load (you don't share
that circuit with a microwave oven).
Mine was borderline, sagged to the low end of that range, on the middle
post (in a newish home). When moved to another tap to increase the
voltage; was still in the 'ok' range for unloaded voltage (it CAN be too
high).
A little testing and experimentation is needed in setup of the amp; and
at any new location.
Mine didn't fault in the sag, my goal was a cleaner output with the
higher voltage while keeping in that window.
73,
Rick NK7I
On 3/2/2022 10:39 PM, Jim Brown wrote:
On 3/2/2022 9:38 PM, Dr. William J. Schmidt wrote:
I have a KPA500 that faults on low (60 VDC) voltage.
Hi Bill,
It MIGHT be faulting because the HV is too low. It's an un-regulated
supply, so if line voltage is low, HV will be low. There's a jumper to
re-tap the power transformer, accessible with the top off, details in
the manual. We used to run into that when running two K3/KPA500
stations on the same 2kVA Honda on county expeditions for 7QP and CQP.
73, Jim K9YC
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