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@Gordon
That seems very strange... The Pico's RTC can sometimes be as much as 10% out because it's using the internal oscillator (that will be fixed soon hopefully), but it shouldn't be out by any more than that.
Maybe you could connect an LED across the signal wire from the radio so you can see what it's really doing?
It's possible that it's just receiving a lot of noise alongside the signal. The signal itself is very weak. To get to reliable I had to put mine right near the window.