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

Rex rexa at sonic.net
Wed Aug 29 01:23:36 UTC 2012


I would think the knob on a 10 KW pot would look something like the 
latch wheel on a navy hatch.

To need the 10 KW rating on a 10K ohm pot, ohms law seems to tell me 
Vref would be close to 10 KV. Perhaps a bit high for most varactor diodes.


On 8/28/2012 6:13 PM, Michael Blazer wrote:
> 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
>>>




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