Re: [time-nuts] FE-5680A software calibration units ?

[Nick Sayer via time-nuts]

> On Sep 19, 2015, at 4:20 PM, Nick Sayer via time-nuts  
> wrote:
> […]
> I’ve tested it against GPS and as it came, it had about a 0.5 ppm error.

Oops. That was supposed to be 0.5 ppb - 500 ppt.


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Re: [time-nuts] FE-5680A software calibration units ?

[Bob Camp]

Hi

Assuming it shows locked, that would suggest that (for what ever reason) 
it’s been re-tuned at some point after it left the factory.

Bob

> On Sep 20, 2015, at 9:06 PM, Nick Sayer via time-nuts  
> wrote:
> 
> 
>> On Sep 19, 2015, at 4:20 PM, Nick Sayer via time-nuts  
>> wrote:
>> […]
>> I’ve tested it against GPS and as it came, it had about a 0.5 ppm error.
> 
> Oops. That was supposed to be 0.5 ppb - 500 ppt.
> 
> 
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Re: [time-nuts] FE-5680A software calibration units ?

[Nick Sayer via time-nuts]

When I got it, the setting was zero. That suggests to me that the factory 
tuning was erased, assuming that the factory tunes it the same way - by 
changing the value adjusted by that software.

> On Sep 21, 2015, at 4:34 AM, Bob Camp  wrote:
> 
> Hi
> 
> Assuming it shows locked, that would suggest that (for what ever reason) 
> it’s been re-tuned at some point after it left the factory.
> 
> Bob
> 
>> On Sep 20, 2015, at 9:06 PM, Nick Sayer via time-nuts  
>> wrote:
>> 
>> 
>>> On Sep 19, 2015, at 4:20 PM, Nick Sayer via time-nuts  
>>> wrote:
>>> […]
>>> I’ve tested it against GPS and as it came, it had about a 0.5 ppm error.
>> 
>> Oops. That was supposed to be 0.5 ppb - 500 ppt.
>> 
>> 
>> ___
>> time-nuts mailing list -- time-nuts@febo.com
>> To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
>> and follow the instructions there.
> 

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Re: [time-nuts] FE-5680A software calibration units ?

[ewkehren via time-nuts]

Depends on who you got it from




Sent from Samsung tabletNick Sayer via time-nuts  
wrote:When I got it, the setting was zero. That suggests to me that the factory 
tuning was erased, assuming that the factory tunes it the same way - by 
changing the value adjusted by that software.

> On Sep 21, 2015, at 4:34 AM, Bob Camp  wrote:
> 
> Hi
> 
> Assuming it shows locked, that would suggest that (for what ever reason) 
> it’s been re-tuned at some point after it left the factory.
> 
> Bob
> 
>> On Sep 20, 2015, at 9:06 PM, Nick Sayer via time-nuts  
>> wrote:
>> 
>> 
>>> On Sep 19, 2015, at 4:20 PM, Nick Sayer via time-nuts  
>>> wrote:
>>> […]
>>> I’ve tested it against GPS and as it came, it had about a 0.5 ppm error.
>> 
>> Oops. That was supposed to be 0.5 ppb - 500 ppt.
>> 
>> 
>> ___
>> time-nuts mailing list -- time-nuts@febo.com
>> To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
>> and follow the instructions there.
> 

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[time-nuts] FE-5680A software calibration units ?

[Nick Sayer via time-nuts]

I’ve designed and built a small power/interface board for my FE-5680A. It takes 
DC power from a surplus laptop power supply (16-24 VDC) and uses a buck 
converter to drop that down to 15v and a 5v LDO to supply the 5v pin. It brings 
the serial and PPS out to a 4 pin SIP header and the 10 MHz to a separate 2 pin 
SIP. I’m going to rev the design to use a transistor to drive the “ready” LED, 
but it’s working fine (since I’m not using the PPS output), since I used a 
higher than normal series resistor for the LED (560 ohms to +5) for the 
meantime.

I’ve tested it against GPS and as it came, it had about a 0.5 ppm error. I’ve 
downloaded the VK4XV calibrator and setting the offset to 1000 *appears* to 
have squared it within my ability to measure. That suggests that the units for 
the calibrator are 0.5 ppt. Does that resonate (pun intended) with anyone 
else’s experience?
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