[time-nuts] using Fury GPSDO with Rb
SAIDJACK at aol.com
SAIDJACK at aol.com
Mon Apr 7 04:38:52 EDT 2008
Hi Scott,
let me reply on this list since other users are also using Rb's.
Here is a quick pointer:
1) determine EFC slope of Rb (pos = frequency goes higher with higher EFC
voltage). Set the slope with serv:efc:slop [positive/negative]
2) Determine maximum frequency deviation at EFC = 0V (serv:coarsedac 0)
using a frequency counter
3) Determine maximum frequency deviation at EFC = 5V (serv:coarsedac 255)
4) Set Dacgain according to table in user manual depending on the frequency
difference between 2) and 3)
5) Set Integral part of loop to zero: serv:phaseco 0.0, this helps for now
6) Set Proportional part of loop to a number that makes the unit lock as
quickly as desired without oscillation and overshoot (for example: serv:efcs 1.0
to serv:efcs 6.0
7) Set the integral part of the loop so that the phase is driven to 0ns UTC
offset as quickly as desired without overshoot/oscillation, for example:
serv:phaseco 20.
Repeat 6) and 7) after some hours.
Hope that helps,
bye,
Said
> -----Original Message-----
> From: Scott Mace
> Sent: Saturday, April 05, 2008 17:51
> To: Said Jackson
> Subject: Re: Fury GPSDO
>
>
> Said, I finally got my fury up and running, I'm using a efratom
> FRS-A and also a LPRO-101.
> Do you have any recommending starting points for tuning the servo
> for a rubidium unit?
>
> Scott
>
**************Planning your summer road trip? Check out AOL Travel Guides.
(http://travel.aol.com/travel-guide/united-states?ncid=aoltrv00030000000016)
More information about the time-nuts
mailing list