[time-nuts] LPRO 101 ADJUSTMENT

[Scott Mace]

Here's an idea of what the DAC on my system is doing:

timestamp       freq_err  time_int efc_voltage
54672 85907.015 2.18e-12 -5.00e-10 1.976955
54672 85917.015 1.87e-12 -4.10e-10 1.976116
54672 85927.015 1.96e-12 -3.00e-10 1.975772
54672 85937.016 1.49e-12 -1.90e-10 1.975664
54672 85947.017 1.52e-12 -1.50e-10 1.975790
54672 85957.017 8.29e-13 -1.60e-10 1.976403
54672 85967.018 8.95e-13 -9.10e-11 1.976403
54672 85977.009 2.52e-14 -9.20e-11 1.976634
54672 85987.009 -1.16e-13 -2.30e-10 1.977615
54672 85997.010 -5.73e-13 -2.30e-10 1.977615
54672 86007.011 -6.71e-13 -3.40e-10 1.977129
54672 86017.011 -1.10e-12 -4.70e-10 1.977208
54672 86027.013 -1.31e-12 -6.70e-10 1.977122
54672 86037.013 -1.79e-12 -9.90e-10 1.977883
54672 86047.013 -2.16e-12 -1.40e-09 1.978333
54672 86057.015 -2.59e-12 -1.70e-09 1.978397
54672 86067.015 -2.94e-12 -2.10e-09 1.978397
54672 86077.015 -3.12e-12 -2.50e-09 1.978521
54672 86087.017 -3.36e-12 -2.80e-09 1.978479
54672 86097.010 -3.20e-12 -3.00e-09 1.978253
54672 86107.018 -3.33e-12 -3.20e-09 1.977620
54672 86117.018 -3.05e-12 -3.30e-09 1.977035
54672 86127.010 -3.09e-12 -3.40e-09 1.976963
54672 86137.010 -2.83e-12 -3.30e-09 1.976998
54672 86147.011 -2.68e-12 -3.20e-09 1.976998
54672 86157.010 -2.20e-12 -3.00e-09 1.976787
54672 86167.010 -1.93e-12 -2.70e-09 1.976953
54672 86177.012 -1.81e-12 -2.50e-09 1.977248
54672 86187.014 -1.51e-12 -2.20e-09 1.977218
54672 86197.015 -1.52e-12 -2.00e-09 1.976899
54672 86207.015 -1.27e-12 -1.80e-09 1.976659
54672 86217.017 -1.09e-12 -1.60e-09 1.976506
54672 86227.016 -8.53e-13 -1.40e-09 1.976144
54672 86237.017 -7.64e-13 -1.20e-09 1.976058
54672 86247.018 -6.27e-13 -1.10e-09 1.976518
54672 86257.018 -8.53e-13 -9.90e-10 1.976634
54672 86267.010 -8.15e-13 -9.60e-10 1.977167
54672 86277.010 -1.24e-12 -1.00e-09 1.978143
54672 86287.010 -1.27e-12 -1.00e-09 1.977806
54672 86297.012 -1.72e-12 -1.10e-09 1.977363
54672 86307.010 -1.79e-12 -1.20e-09 1.977358
54672 86317.009 -2.10e-12 -1.30e-09 1.977070
54672 86327.013 -2.27e-12 -1.50e-09 1.977347
54672 86337.014 -2.35e-12 -1.80e-09 1.978016
54672 86347.014 -2.63e-12 -2.10e-09 1.978357
54672 86357.016 -2.57e-12 -2.40e-09 1.978433
54672 86367.010 -2.87e-12 -2.70e-09 1.978821
54672 86377.014 -2.50e-12 -2.90e-09 1.978657
54672 86387.013 -2.64e-12 -3.00e-09 1.978657
54672 86397.010 -2.00e-12 -3.10e-09 1.977049

	Scott

jshank wrote:
> If I choose to control the frequency via External C-field control I guess it 
> would take a very precise and stable voltage source.  Any thoughts or 
> suggestions?
> 
> ----- Original Message ----- 
> From: "Scott Mace" <smace at intt.net>
> To: "jshank" <j-shank at comcast.net>; "Discussion of precise time and 
> frequency measurement" <time-nuts at febo.com>
> Sent: Friday, July 25, 2008 7:15 PM
> Subject: Re: [time-nuts] LPRO 101 ADJUSTMENT
> 
> 
>> Both methods work well.  Be sure the unit is mounted to some sort of 
>> heatsink,chassis, etc.
>> I'm using a Fury GPS receiver to drive the EFC on an LPRO-101.
>> You won't get much range out of either adjustment.  Leave it powered
>> on for a couple of hours before trying to adjust it.  I usually set the 
>> trim pot in the
>> middle of it's range and use the EFC pin.  I think it's a 28 or 30 turn 
>> pot.  EFC
>> is 0-5v.  The unit will self-bias to around 2.5v if the EFC pin is open.
>>
>> Scott
>>
>> jshank wrote:
>>> Hi,
>>>
>>> I recently acquired a LPRO 101 Rubidium Oscillator.  After reading the 
>>> manual I see that there are two ways to adjust the frequency 1) using and 
>>> adjusting screw on the unit and 2) using the External C-field control 
>>> signal at pin J1-7.  Has anyone experimented with either method and if so 
>>> what method was preferred?
>>>
>>> Jeff
>>>
>>>
>>> _______________________________________________
>>> 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.
> 
>