Re: [time-nuts] Isotemp OCXO trimpot question.
Thanks to all who submitted responses to my Isotemp trimpot question. I think I have a handle on the correct value range now. If anyone spots a 10KW pot on ebay, please keep me in mind... ;-) Bud w0lcp ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] Isotemp OCXO trimpot question...
Now I need to find a 10 KW potentiometer! John -- From: Jerry jster...@att.net Sent: Monday, August 27, 2012 8:10 PM To: 'Discussion of precise time and frequency measurement' time-nuts@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 6624.2). 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-boun...@febo.com [mailto:time-nuts-boun...@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.pat...@frontiernet.netwrote: 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 ___ time-nuts mailing list -- time-nuts@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@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@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@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] Isotemp OCXO trimpot question...
Read more carefully, Bob. It was a joke based on a typo. On 8/28/2012 5:44 PM, Bob Camp wrote: 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, jmfrankejmfra...@cox.net wrote: Now I need to find a 10 KW potentiometer! John -- From: Jerryjster...@att.net Sent: Monday, August 27, 2012 8:10 PM To: 'Discussion of precise time and frequency measurement'time-nuts@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 6624.2). 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 ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
[time-nuts] Isotemp OCXO trimpot question...
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 ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] Isotemp OCXO trimpot question...
I tried to attach to this email a datasheet for a very similar Isotemp 10Mhz OCXO (Model OCXO134-10; PN 6624.2) the time-nuts server will not let me. 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. Control0 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-boun...@febo.com [mailto:time-nuts-boun...@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.pat...@frontiernet.netwrote: 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 ___ time-nuts mailing list -- time-nuts@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@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@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
