KAT500 VSWR Threshold for key interrupt

[ANDY DURBIN]

The KAT500 utility provides the means to set a VSWR threshold for Key Interrupt either by individual band, or the same value for all bands.    Selecting ALL, entering 1.50 in the Amplifier Key Interrupt box, selecting Apply, results in 1.50 being set for all bands as expected. After the operation Apply is dim.  Leaving the Config menu and returning to it still shows 1.50 selected for all bands.

If All is reselected, 1.60 entered, and Apply selected then Apply does no go dim but the individual bands, and ALL,  each show 1.60. Then select OK and Operate.   Then return to Configuration, edit Configuration, VSWR Thresholds.  With ALL selected Amplifier Key Interrupt is blank.   Inspecting the value for each band shows 160 = 1.59 and all other bands 1.50.   The entered value of 1.60 was not applied.

This anomaly seems repeatable in that 1.50 can be entered, 1.55 can be entered, 1.80 can be entered,   but 1.60 and 1.56 cannot be.  The sign that that data entry has failed is that Apply does not go dim.

Is this a known problem with KAT500 utility 1.16.7.25?

Thanks,
Andy, k3wyc
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[ANDY DURBIN]

Assuming the utility uses the ST command to set each band in turn then I suspect the utility fails to set all bands because the test for the first band being set correctly fails due to rounding errors. Once the test fails I suspect no attempt is made to set the other bands.

ST01K1.80; followed by ST01K; returns 1.80

ST01K1.50; followed by ST01K; returns 1.50

but

ST01K1.60; followed by ST01K; returns 1.59


It does seem to be possible to set all bands to 1.59 by setting each individually to 1.60 using the STbbK command.


73,
Andy, k3wyc


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[ANDY DURBIN]

Elecraft has revised the KAT500 utiity to fix this problem.  VSWR threshold can now be set to 1.60 for all bands (but is reported as 1.59 due to rounding issues mentioned in the help documentation).  New firmware is available here - https://elecraft.com/pages/firmware-software

Thanks Dick.

73,
Andy, k3wyc

________________________________


The KAT500 utility provides the means to set a VSWR threshold for Key Interrupt either by individual band, or the same value for all bands.    Selecting ALL, entering 1.50 in the Amplifier Key Interrupt box, selecting Apply, results in 1.50 being set for all bands as expected. After the operation Apply is dim.  Leaving the Config menu and returning to it still shows 1.50 selected for all bands.

If All is reselected, 1.60 entered, and Apply selected then Apply does no go dim but the individual bands, and ALL,  each show 1.60. Then select OK and Operate.   Then return to Configuration, edit Configuration, VSWR Thresholds.  With ALL selected Amplifier Key Interrupt is blank.   Inspecting the value for each band shows 160 = 1.59 and all other bands 1.50.   The entered value of 1.60 was not applied.

This anomaly seems repeatable in that 1.50 can be entered, 1.55 can be entered, 1.80 can be entered,   but 1.60 and 1.56 cannot be.  The sign that that data entry has failed is that Apply does not go dim.

Is this a known problem with KAT500 utility 1.16.7.25?

Thanks,
Andy, k3wyc
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