[Elecraft] FW 4.67 and K3EXREF

[Stan Gibbs]

I just realized that both my K3's running FW 4.67 are no longer locking to
the K3EXREF calibration signal from a Trimble Thunderbolt. Specifically, the
"REF CAL" config menu item does not show the flashing asterisk and moving
the main tuning knob does not show "LOCKED". I have had the K3EXREF
installed and operating properly with both rigs for at least a year.  

The Trimble Thunderbolt provides the 10MHz calibration signal to both K3's
though a MiniCircuits splitter. After checking the power supply and output
levels of the Thunderbolt, which were nominal, I decided to see if the K3
firmware could be responsible, since I had fairly recently upgraded to 4.67. 
Indeed, rolling back to 4.51 re-enables the normal "REF CAL" behavior!

Can anyone else verify this?





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73, Stan - KR7C
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