[Elecraft] K60XV Builder Alert: TUNE mode issues with KAT2

[wayne burdick]

If you have a K60XV (60 m/XVTR interface) installed in your K2, *and* a 
KAT2 (internal ATU), you may notice two problems in TUNE mode. These 
only occur if you're using the low-power (0 dBm) transverter interface 
on the K60XV. Both have simple work-arounds:

1. If the KAT2 is in either of its autotune modes (AUTO or ALT), the 
holding the TUNE button drops power output to 0.2 milliwatts maximum in 
low-power (LP) mode. You can override this behavior by simply holding 
DISPLAY along with TUNE. You can also use the menu to change configure 
the KAT2 for any mode other than AUTO or ALT, but this is less 
convenient.

2. In some cases the LM358 op-amp on the KAT2 can load down the K60XV's 
RF detector (at the emitter of Q2), preventing the K60XV from 
developing a full 0 dBm (1 milliwatt) signal at the low-level 
transverter OUT jack. To correct this, change R6 on the KAT2 from 47 
ohms to 470 ohms. This will have a negligible effect on normal use of 
the KAT2.

Both issues will be documented in a forthcoming errata sheet update for 
the K60XV manual.

73,
Wayne
N6KR

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