[time-nuts] LPFRS analog C-field adjust

Magnus Danielson magnus at rubidium.dyndns.org
Fri Jun 1 16:26:05 UTC 2012


Hi Azelio,

On 05/31/2012 04:39 PM, Azelio Boriani wrote:
> Today, trying to figure out how to get control of the C-field directly, I
> found that the analog fine tune input is already connected directly to the
> C-field coil summing point via a 12K resistor, an op-amp (a buffer) and a
> 560 resistor. The other contributor is the DAC8800 pin 17 (Voutg) via a
> 12K/op-amp/2K7). So the EFC is not A/D converted and then D/A converted
> back to analog, at least not in the LPFRS-01 I have (made in 2003).

Thanks!

Happy to learn this. Will need to test it.

Cheers,
Magnus




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