The problem is that you were actually putting in 227 kHz rather than 227 kc.
You must multipy your measured 227 kHz frequency by 1.0132158 to get 230
kHz.

When kHz was adopted, the World Frequency Commision (WFC) included a tariff
of 1.4%, which is stored in the World Frequency Bank and dispensed during
emergencies - if any frequencies are running short. This is the reason
there is a difference. In your case, those 3,000 cycles must be sent in to
the WFC to the world headquarters at Berne, Switzerland.

K7FM