Elecraft KAT500 firmware v1.05

Reduce tendency to repeatedly auto tune on the same frequency when near the auto tune threshold Change handling of the configuration option "Amplifier Key Interrupt SWR Threshold"​.

This per-band threshold can be set to 99:1 or larger to defeat this function; it was hot switching some amplifier keying relays unnecessarily.

KPA500 owners may wish to reduce the Amplifier Key Interrupt SWR threshold to a level that inhibits KPA500 high SWR faults.

Use the KAT500 Utility Configuration tab, Edit Configuration, VSWR Thresholds, to set this value.

The default for this threshold is 99:1.

The "Amplifier Key Interrupt SWR Threshold" is not tested in mode BYPASS.

Significant changes in how the amplifier key line interrupt relay is handled.

This was done for amplifiers other than the KPA500 that might be damaged by interrupting the amplifier's T/R relay while RF is present.

The default value is chosen to be safe for any amplifier.

Add a new "Amplifier Key Interrupt Power" (AKIP) threshold to allow per-owner control of the KAT500's use of the the amplifier key line interrupt relay.

The value you choose depends on your amplifier's ability to hot switch its T/R keying relay.

Some amplifiers (e.g., KPA500) have solid-state switches and are designed to switch the T/R relay at full power.

For these amplifiers, an "unlimited" threshold is appropriate. 1500 watts is interp​reted as "unlimited", even if the amplifier is incapable of 1500 watts.

KPA500 owners should choose 1500.

Some amplifiers have relays that should not be switched at high power.

Set the threshold to a value that is safe for your amplifier.

The factory default for is 30 watts.

Use the KAT500 Utility version 1.12.11.8 or later, Configuration tab, Edit Configuration, Amplifier Key Interrupt Power.

Click Help from this dialog for recommended settings.