[time-nuts] NBS Dual Mixer Time Difference system (A picture!)

[Magnus Danielson]

Hi,

Cool to see. How well does it perform in todays context? Still useful or
a bit too cumbersome to really use?

Cheers,
Magnus

On 2020-08-11 18:58, cdelect at juno.com wrote:
> Hi,
>
> Saw Bobs recent post mentioning the NBS DMTD system.
>
> I happen to own one of those old beasts!
>
> My  version has switch selected coarse delay and a fine variable delay to
> match phases.
>  
> (I really don't use them as it's easier to slew my reference or DUT till
> the phase matches for low TAU work.)
>  
> Also it has AC powers supplies versus battery for the papers version.
>  
> I also replaced the RF connectors with isolated SMA.
>  
> When I originally got it I had to repair one of the buffer amps and I
> also replaced the op amps with better ones.
>  
> Also replaced the caps and resistors for the 1 Sec setting with low
> temperature coefficient ones.
>  
> Cheers,
>  
> Corby
>
> _______________________________________________
> time-nuts mailing list -- time-nuts at lists.febo.com
> To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com
> and follow the instructions there.