The latest KPA500 firmware can be found at:
http://www.elecraft.com/KPA500/kpa500_software.htm
NOTE: Please also install the latest KAT500 firmware, if applicable. This is
the subject of a subsequent email.
Changes:
1. Attenuator fault deferred to allow KAT500 to interrupt amp key line
During normal operation, an in-band frequency excursion or band change might
result in a temporary high reflected power condition. The KAT500 can interrupt
the amplifier key line within a few tens of milliseconds to adjust its settings
accordingly, but during that period the KPA500 used to flash a red FAULT LED
indicating a “soft” attenuator fault. This change defers the illumination of
the FAULT LED for a short period (about 1/4 second). If the reflected power
continues to be high long enough, then the FAULT LED is illuminated as before.
There’s no difference in the way the amp protects itself; it just doesn’t light
red LEDs in the early part of this cycle. With this change (and corresponding
KAT500 firmware changes), QSY and band switching with the KAT500/KPA500 should
not blink the KPA500 fault LED.
2. New fan speed query command (for remote control applications).
73,
Wayne
N6KR
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