[time-nuts] Portable standard - Rb query
Joe, I have several of the FEI units. You pay more for these, because (assuming you get the right one) they have a DDS synthesizer included, which (with suitable modification) allows them to operate from about 1kHz to 15MHz in 10mHz steps. Some models require +15V and +5V, others just +15V. My preferred unit is the FE-5680A. I have mine mounted on a large aluminium plate and powered by a switch-mode computer supply. I have set the default frequency to 10MHz. The LPRO type are fine if you want a simple fixed 10MHz reference, and are in general cheaper and use less power. As for lifetime, they seem to go forever. That said, there's no need to power them continuously since (in my experience) they are close to their final frequency 5 minutes from a cold start. Power consumption is higher than an OCXO, but they really do make a great portable standard. That's what I'd use (in fact, that's what I do use). Murray ___ 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] Portable standard - Rb query
Murray, Do you have any details on the DDS? How difficult is it to change on the fly if I wanted to? Is the FE-5680A that you like +15V only? Joe Gray W5JG On Wed, Apr 6, 2011 at 12:34 PM, Murray Greenman murray.green...@rakon.com wrote: Joe, I have several of the FEI units. You pay more for these, because (assuming you get the right one) they have a DDS synthesizer included, which (with suitable modification) allows them to operate from about 1kHz to 15MHz in 10mHz steps. Some models require +15V and +5V, others just +15V. My preferred unit is the FE-5680A. I have mine mounted on a large aluminium plate and powered by a switch-mode computer supply. I have set the default frequency to 10MHz. The LPRO type are fine if you want a simple fixed 10MHz reference, and are in general cheaper and use less power. As for lifetime, they seem to go forever. That said, there's no need to power them continuously since (in my experience) they are close to their final frequency 5 minutes from a cold start. Power consumption is higher than an OCXO, but they really do make a great portable standard. That's what I'd use (in fact, that's what I do use). Murray ___ 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] Portable standard - Rb query
Quick? How much do you want to pay? $1500 perhaps. On Wed, Apr 6, 2011 at 3:47 PM, Joseph Gray jg...@zianet.com wrote: Murray, Do you have any details on the DDS? How difficult is it to change on the fly if I wanted to? Is the FE-5680A that you like +15V only? Joe Gray W5JG On Wed, Apr 6, 2011 at 12:34 PM, Murray Greenman murray.green...@rakon.com wrote: Joe, I have several of the FEI units. You pay more for these, because (assuming you get the right one) they have a DDS synthesizer included, which (with suitable modification) allows them to operate from about 1kHz to 15MHz in 10mHz steps. Some models require +15V and +5V, others just +15V. My preferred unit is the FE-5680A. I have mine mounted on a large aluminium plate and powered by a switch-mode computer supply. I have set the default frequency to 10MHz. The LPRO type are fine if you want a simple fixed 10MHz reference, and are in general cheaper and use less power. As for lifetime, they seem to go forever. That said, there's no need to power them continuously since (in my experience) they are close to their final frequency 5 minutes from a cold start. Power consumption is higher than an OCXO, but they really do make a great portable standard. That's what I'd use (in fact, that's what I do use). Murray ___ 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.
