[Elecraft] Problem with K3EXREF

[Paul Wilton]

I’ve just added a new K3EXREF to my K3 but it’s not working.  When I select CONFIG->REF CAL, I don’t see the * indicating lock.  Also, I can change the cal frequency via VFO A.

I have confirmed that a suitable 10MHz clock is appearing on Pin 8 of the header on the K3EXREF PCB.  There is also 49.380MHz presented on pin 6.  On pin 1, I can see some very long duration (50ms to 400ms) square waves going from 0 to 4.7v every few seconds.  These same pulses appear on Pin 1 of P75 on the KREF3 PCB and then onto the RF board.  

The K3 is running the latest firmware.

Has anyone has similar problems and found a way to fix them?  I have put in a call to support but wondering if someone on the list is able to help prior to Monday AM

73

Paul
M1CNK