[Elecraft] K3S & 2m Internal Transverter Calibration Problem Using External Reference

[Keith Trinity WE6R]

Make sure the RefLock board is seated all the way down in the K144 and 
cabled correctly (there is a BAD diagram floating around).
Check for current Firmware, FW of BOTH the radio AND the K144XV! Older 
did not support the RefLock!
Check the TMP socket(s) on the K144XVREFLOCK for shoved in centers, they 
can get pushed in.
Make sure the TAP 0 (zero) in the XV1 OFS menu says REFLOCK and not NOR.
Does the external ref give you an asterisk blinking in the REF CAL 
config menu after about 15 seconds or less?
If so, the RefLock in the K144 should lock to that and be very accurate.
HOWEVER;
What is the main REF CAL number when calibrated? If it is too far away 
from 49.380.000 the RefLock will not be able to pull the K144 onto 
frequency.
If it is below 49.379.500 or so it could be the problem, in which case 
you need a new main oscillator.
If the external Reference is being used (EXREF) then there is no need 
for the main oscillator to be the high stability KCTXO3-1.
Put the low stability one back in if you upgraded and see if it's number 
is closer to 49.380

If you do have the high stability KTCXO3-1, and the number is too far 
out, you can tweak the cap under the sticker to MAYBE get it close enough.
Go slow on tuning, and don't set it too close to the "wrap" point or a 
temp change may make it go out of lock.
IE On 6meters, set radio and accurate signal generator to get a nice 
signal, disable the EXREF, and tweak bringing the 49.379.xxx freq closer 
to 49.38.
It will only go so far an go out of lock, go back a little until it 
locks, then maybe a tad bit back to allow for temp changes.
Keith WE6R Elecraft K3 Tech.