[Elecraft] K1 - problem with KAT1

[Raymund Band]

I have just installed a KAT1 in a K1 with 4-bands filter board. The KAT1
bridge adjustment and power calibration were performed without difficulty.

 

The K1 (serial number 25xx) has been used without any problems and the KAT1
has been used previously with a different 2-bands K1. Using Tune and testing
into a good 50 ohm load, everything worked OK on 7, 10 and 14 MHz but 21 MHz
showed a problem. After a long tune (about 1 sec), the display showed LO P
and the combined load/power-meter showed 0.5 watt. Another known good 50 ohm
load gave the same result.

 

Removing the KAT1 showed that the K1 could easily give 6 watts on all bands,
including 21 MHz. 

 

With the KAT1 re-installed and looking at the results of the tune on all
four bands (7, 10, 14 & 21 MHz) on the ATU menu, the lowest 3 bands all
showed L = 0.0, C = 00, which seems reasonable with a 50 ohm load. 

The highest band (21 MHz) showed L = 4.9 and C = 63. So something seems
wrong in the KAT1. Can it be power measurement (D1 & D2 etc)?

 

Ray / SM5XLP