> Replacement KREF3 card has been tried > Did this include a new 49.38 MHz oscillator? If that is bad, then there is no reference to which the synth can lock. Do you have a receiver that covers 49.38 MHz, or 8.230 MHz? Or an oscilloscope, freq counter or other means by which you can verify the 49.38 MHz oscillator is working? 73, Lyle KK7P