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

Michael Blazer mblazer at satx.rr.com
Tue Aug 28 21:13:46 EDT 2012


The ohm symbol in the symbol character set is the same code as the "W".

I've seen some 10 kW rheostats.  You could use the OCXO as decoration on 
the shaft.

Mike

On 8/28/2012 7:24 PM, jmfranke 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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