[Elecraft] FW 4.67 and K3EXREF

[David G4DMP]

Check the release notes, Stan.  MCU 4.57 / DSP 2.79, 10-24-2012 state:

K3EXREF USERS MUST NOW ENABLE THE MODULE IN THE MENU: To do this, locate
the CONFIG:REF CAL menu and tap 2 to change the setting; flashes XREF IN
or XREF OUT.

73 de David G4DMP

In a recent message, Stan Gibbs <stan at ajaxsoftware.com> writes
>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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 | David M Pratt, Kippax, Leeds.   |
 | Website: http://www.g4dmp.co.uk |
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