[time-nuts] Isotemp OCXO trimpot question...

Bob Camp lists at rtty.us
Tue Aug 28 20:44:08 EDT 2012


Hi

I wouldn't go to crazy digging up a 10K pot. I suspect that anything in the 10K to 50K range will work ok.

Bob

On Aug 28, 2012, at 8:24 PM, jmfranke <jmfranke at cox.net> wrote:

> Now I need to find a 10 KW potentiometer!
> 
> John
> 
> --------------------------------------------------
> From: "Jerry" <jsternmd at att.net>
> Sent: Monday, August 27, 2012 8:10 PM
> To: "'Discussion of precise time and frequency measurement'" <time-nuts at febo.com>
> Subject: Re: [time-nuts] Isotemp OCXO trimpot question...
> 
>> I don't know if the list allows attachments but I tried to attach to this
>> email a datasheet for a very similar Isotemp 10Mhz OCXO (Model OCXO134-10;
>> PN 6624.00002).   Just in case the attachment doesn't come thru here is the
>> relevant section.
>> 
>> I am not certain whether the pins are the same as your model but I believe
>> all the Isotemp OCXO have same arrangement:
>> 
>> 3. ELECTRICAL FREQUENCY ADJUSTMENT
>> 3.1. Range > ±0.45 PPM
>> < ±1.2 PPM (At time of shipment) (Referenced
>> to nominal frequency)
>> 3.2. Control 0 VDC to Vref (0 VDC to +8 VDC ) or a 10 kW
>> potentiometer connected between pins 2 and 4 with wiper connected to pin 3.
>> 3.3. Slope Positive
>> 3.4. Center Vref/2 ±10% of Vref (+4 VDC to +0.8 VDC)
>> 
>> 
>> Jerry
>> 
>> 
>> -----Original Message-----
>> From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On
>> Behalf Of Azelio Boriani
>> Sent: Monday, August 27, 2012 6:57 PM
>> To: Discussion of precise time and frequency measurement
>> Subject: Re: [time-nuts] Isotemp OCXO trimpot question...
>> 
>> If there is no datasheet to refer to then the usual value is between 10K and
>> 20K.
>> 10K is the most common value for 5V or 8V Vref. The OCXO should provide the
>> Vref output pin to connect one side of the pot, the other to GND, for a GND
>> referenced EFC. Your mileage may vary but, without a datasheet, it is the
>> best starting point.
>> 
>> On Mon, Aug 27, 2012 at 11:26 PM, Bud Patten
>> <bud.patten at frontiernet.net>wrote:
>> 
>>> I have an Isotemp OCXO (674-0010-000) an am wondering what is the
>>> recommended value for the frequency trim pot?
>>> 
>>> Bud
>>> W0LCP
>>> 
>>> Time is only there to prevent
>>> everything from happening at once.
>>> 
>>> Einstein
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> 
> 
> 
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> 
> 
> 
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