[time-nuts] FE-5680A

Peter Bell bell.peter at gmail.com
Thu Nov 10 17:37:36 EST 2011


As far as I can see, the trimpot has no effect at all - the only frequency
trim on the unit is via the RS232 interface on pins 8 and 9 of the
connector I suspect this is adjusting the c field, but have not actually
verified this. It does definately change the output frequency, though.
On Nov 11, 2011 6:17 AM, <EWKehren at aol.com> wrote:
>
> Thank you Peter
> With Jose's and your input I will power it up in the morning. Mine has the
> same part # and a date code 0330. Does yours respond to the trim pot, I
> plan to  bring out the tuning voltage to a modified Shera controller.
> Bert
>
>
> In a message dated 11/10/2011 5:03:07 P.M. Eastern Standard Time,
> bell.peter at gmail.com writes:
>
> Assuming  it's the same as the units I have (two labels, with "FEI  P/N
> 217400-30352-1" on the upper label and two barcodes on the  lower
> label) then the +5V supply runs all the logic in the unit. There  are
> no special power sequencing requirements, but you need both  supplies
> for the unit to operate. The current drain on the 5V line is  fairly
> low - about 90mA - the 15V will pull about 2A when the unit is  cold
> and then drops to 500-600mA once everything is warmed up.  Pin 3  is
> the lock indicator - driven low when locked.  The output (10MHz  sine)
> is present on pin 6, and appears immediately after power up -  although
> the frequency is not accurate until the lock pin is  asserted.
>
> The 4 digit prefix on the lower barcode is a date code - so  "S/N
> 0416-77234" would indicate a unit made in week 16 of  2004.
>
> Regards,
>
> Pete Bell
>
> On Fri, Nov 11, 2011 at 12:30  AM,  <EWKehren at aol.com> wrote:
> > I did purchase one of the  "New"  FE-5680A Rb's. Looking at packaging
 and
> > the housing  it does look new. I have not powered it up because of +5
> Volt on
> >  pin 4. Does any one know its purpose and is there a power up  sequence.
> Any
> > help will be appreciated.
> > Bert Kehren  Miami
> >  _______________________________________________
> > time-nuts mailing list  -- time-nuts at febo.com
> > To unsubscribe, go to
> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
> > and follow the  instructions  there.
> >
>
> _______________________________________________
> time-nuts  mailing list -- time-nuts at febo.com
> To unsubscribe, go to
> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
> and follow the  instructions there.
> _______________________________________________
> time-nuts mailing list -- time-nuts at febo.com
> To unsubscribe, go to
https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
> and follow the instructions there.



More information about the time-nuts mailing list