[Elecraft] Update on KX2 key-down times

[Wayne Burdick]

Hi all,

In the process of analyzing a recently repaired KX2, we discovered that key-down times I stated earlier were optimistic. They applied to two prototype KX2s that didn’t have the final driver and PA bias circuitry that we optimized to achieve good TX IMD targets. My apologies for quoting incorrect numbers.

Here are some key-down times at various power levels representing rough averages from production units. Tests were made with a 14 volt supply, in TUNE mode, into a dummy load. PA temperature was allowed to go from about 24 C to automatic transmit exit or power drop at 63 C. We used the KX2’s built-in temperature display.

 1 W     > 20:00
 3 W     7:00
 5 W     4:30
10 W     3:30

If you plan to run continuously in data modes, you may need to reduce power output.

There may be third-party add-ons that increase operating time. We haven’t tested any of them ourselves (yet).

73,
Wayne
N6KR