Mike, Concentrate on the "as needed" - not all need the resistor mod. The TCXO has not changed. 73, Don W3FPR On 1/22/2017 3:05 PM, Mike Harris wrote: > Hmm. > > "The KREF3A Reference Oscillator in the K3S has been updated as needed > at the factory". > > Is this just the resistor mod or has there been a change to the canned > TXCO? >