All:
If I read the service manual correctly, the real time clock in the IC7000 is an RX-4581NB-F clock chip that has it's own internal reference oscillator at 32.758 KHz.
The way it's configured, the oscillator output pin is disabled to reduce current when the radio is off (chip should be drawing about .8 uA), so you can't sample that reference. I also don't see any facility for trimming that reference in the specs for the chip.
So, we seem to be kind of stuck with whatever rate the thing is running at. The Specs mention that this chip is available for tighter tolerance to 1 min per month (which I don't think is all that good), but I suspect we don't have that in the 7000 so it's probably worse.
The RTC is powered by the 3.3V buss and has a small backup battery to power it when the radio is off.
That's all I know.
Chuck - N8DNX
