[time-nuts] LPRO 101 ADJUSTMENT

jshank j-shank at comcast.net
Fri Jul 25 20:33:26 EDT 2008


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
>>
>>
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