Hello, time Nutters-- I have been phase locking the freq counters in my HP 6-GHz VNA, Tektronix spectrum analyzer and bench freq counter to the 10 MHz signal from a Trimble Thunderbolt via a 4-port distribution box and long coax cables to each of the instruments.  This works well but is a pain in the tush connecting to long coax cables when the bench test gear are moved around. A friend suggested looking into some MEMS TCXO's made by SiTime to do this with.   SiTime offers a wide variety of Stratum-3 TCXO chips.  One of them is the SiT5358 which is spec'd at 0.05 ppm from 1 to 60 MHz. https://www.sitime.com/products/super-tcxos/sit5358 I am wondering what any feedback thoughts might be on this from the Time-Nuts gang?  An eval-PCB board for the SiT5358 chip is available.  What say the Time-Nutters gang about this approach for incorporating a small SiT5358 eval-PCB board into my bench test gear for phase locking to?  I am also wondering which of the SuperStratum3 TCXO chips might be the best choice for a project like this? Any feedback on this is most welcome! Mike Baker Gainesville/Micanopy, Florida *****************

On 5/1/20 5:00 PM, Richard Solomon wrote: > Where do you buy these ? Their web site was not too illuminating. > digikey and mouser carry a lot of SiTime parts, including eval boards. > Tnx, Dick, W1KSZ > > On Fri, May 1, 2020, 4:31 PM mpb45@clanbaker.org <mpb45@clanbaker.org> > wrote: > >> Hello, time Nutters-- >> >> I have been phase locking the freq counters in my HP 6-GHz VNA, Tektronix >> spectrum analyzer and bench freq counter to the 10 MHz signal from >> a Trimble Thunderbolt via a 4-port distribution box and long coax cables >> to each of the instruments. This works well but is a pain in the tush >> connecting to long coax cables when the bench test gear are moved around. >> >> A friend suggested looking into some MEMS TCXO's made by SiTime to >> do this with. SiTime offers a wide variety of Stratum-3 TCXO chips. One >> of them is the SiT5358 which is spec'd at 0.05 ppm from 1 to 60 MHz. >> >> https://www.sitime.com/products/super-tcxos/sit5358 >> >> I am wondering what any feedback thoughts might be on this from >> the Time-Nuts gang? An eval-PCB board for the SiT5358 chip is >> available. What say the Time-Nutters gang about this approach for >> incorporating a small SiT5358 eval-PCB board into my bench test >> gear for phase locking to? I am also wondering which of the >> SuperStratum3 TCXO chips might be the best choice for a project >> like this? >> >> Any feedback on this is most welcome! >> >> Mike Baker >> Gainesville/Micanopy, Florida >> ***************** >> >> >> >> _______________________________________________ >> time-nuts mailing list -- time-nuts@lists.febo.com >> To unsubscribe, go to >> http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com >> and follow the instructions there. >> > _______________________________________________ > time-nuts mailing list -- time-nuts@lists.febo.com > To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com > and follow the instructions there. >

Been there, did a search on the part number and came up empty. They did have a "Request Samples" button so I filled out the form. Let's see what happens. 73, Dick, W1KSZ On Fri, May 1, 2020, 5:40 PM jimlux <jimlux@earthlink.net> wrote: > On 5/1/20 5:00 PM, Richard Solomon wrote: > > Where do you buy these ? Their web site was not too illuminating. > > > > > digikey and mouser carry a lot of SiTime parts, including eval boards. > > > > Tnx, Dick, W1KSZ > > > > On Fri, May 1, 2020, 4:31 PM mpb45@clanbaker.org <mpb45@clanbaker.org> > > wrote: > > > >> Hello, time Nutters-- > >> > >> I have been phase locking the freq counters in my HP 6-GHz VNA, > Tektronix > >> spectrum analyzer and bench freq counter to the 10 MHz signal from > >> a Trimble Thunderbolt via a 4-port distribution box and long coax cables > >> to each of the instruments. This works well but is a pain in the tush > >> connecting to long coax cables when the bench test gear are moved > around. > >> > >> A friend suggested looking into some MEMS TCXO's made by SiTime to > >> do this with. SiTime offers a wide variety of Stratum-3 TCXO chips. > One > >> of them is the SiT5358 which is spec'd at 0.05 ppm from 1 to 60 MHz. > >> > >> https://www.sitime.com/products/super-tcxos/sit5358 > >> > >> I am wondering what any feedback thoughts might be on this from > >> the Time-Nuts gang? An eval-PCB board for the SiT5358 chip is > >> available. What say the Time-Nutters gang about this approach for > >> incorporating a small SiT5358 eval-PCB board into my bench test > >> gear for phase locking to? I am also wondering which of the > >> SuperStratum3 TCXO chips might be the best choice for a project > >> like this? > >> > >> Any feedback on this is most welcome! > >> > >> Mike Baker > >> Gainesville/Micanopy, Florida > >> ***************** > >> > >> > >> > >> _______________________________________________ > >> time-nuts mailing list -- time-nuts@lists.febo.com > >> To unsubscribe, go to > >> http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com > >> and follow the instructions there. > >> > > _______________________________________________ > > time-nuts mailing list -- time-nuts@lists.febo.com > > To unsubscribe, go to > http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com > > and follow the instructions there. > > > > > _______________________________________________ > time-nuts mailing list -- time-nuts@lists.febo.com > To unsubscribe, go to > http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com > and follow the instructions there. >

Hi If the idea is to run things standalone, a generic eBay OCXO would work better than these devices. The OCXO would be more stable. It also should be lower noise / better ADEV. If the idea is to lock these up to the TBolt, it’s not at all clear what benefit that would have. Bob > On May 1, 2020, at 8:07 PM, mpb45@clanbaker.org wrote: > > Hello, time Nutters-- > > I have been phase locking the freq counters in my HP 6-GHz VNA, Tektronix > spectrum analyzer and bench freq counter to the 10 MHz signal from > a Trimble Thunderbolt via a 4-port distribution box and long coax cables > to each of the instruments. This works well but is a pain in the tush > connecting to long coax cables when the bench test gear are moved around. > > A friend suggested looking into some MEMS TCXO's made by SiTime to > do this with. SiTime offers a wide variety of Stratum-3 TCXO chips. One > of them is the SiT5358 which is spec'd at 0.05 ppm from 1 to 60 MHz. > > https://www.sitime.com/products/super-tcxos/sit5358 > > I am wondering what any feedback thoughts might be on this from > the Time-Nuts gang? An eval-PCB board for the SiT5358 chip is > available. What say the Time-Nutters gang about this approach for > incorporating a small SiT5358 eval-PCB board into my bench test > gear for phase locking to? I am also wondering which of the > SuperStratum3 TCXO chips might be the best choice for a project > like this? > > Any feedback on this is most welcome! > > Mike Baker > Gainesville/Micanopy, Florida > ***************** > > > > _______________________________________________ > time-nuts mailing list -- time-nuts@lists.febo.com > To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com > and follow the instructions there.

Looking at the datasheet it doesn't look like you'd win any ADEV competitions with it but it's small and the DCTXCO version would be nice to use the I2C interface and it says frequency control resolution as low as 5 ppt. It has uses I can see. Bill On Fri, May 1, 2020, 5:50 PM Richard Solomon <dickw1ksz@gmail.com> wrote: > Been there, did a search on the part number and came up empty. > > They did have a "Request Samples" button so I filled out the form. Let's > see what happens. > > 73, Dick, W1KSZ > > On Fri, May 1, 2020, 5:40 PM jimlux <jimlux@earthlink.net> wrote: > > > On 5/1/20 5:00 PM, Richard Solomon wrote: > > > Where do you buy these ? Their web site was not too illuminating. > > > > > > > > > digikey and mouser carry a lot of SiTime parts, including eval boards. > > > > > > > Tnx, Dick, W1KSZ > > > > > > On Fri, May 1, 2020, 4:31 PM mpb45@clanbaker.org <mpb45@clanbaker.org> > > > wrote: > > > > > >> Hello, time Nutters-- > > >> > > >> I have been phase locking the freq counters in my HP 6-GHz VNA, > > Tektronix > > >> spectrum analyzer and bench freq counter to the 10 MHz signal from > > >> a Trimble Thunderbolt via a 4-port distribution box and long coax > cables > > >> to each of the instruments. This works well but is a pain in the tush > > >> connecting to long coax cables when the bench test gear are moved > > around. > > >> > > >> A friend suggested looking into some MEMS TCXO's made by SiTime to > > >> do this with. SiTime offers a wide variety of Stratum-3 TCXO chips. > > One > > >> of them is the SiT5358 which is spec'd at 0.05 ppm from 1 to 60 MHz. > > >> > > >> https://www.sitime.com/products/super-tcxos/sit5358 > > >> > > >> I am wondering what any feedback thoughts might be on this from > > >> the Time-Nuts gang? An eval-PCB board for the SiT5358 chip is > > >> available. What say the Time-Nutters gang about this approach for > > >> incorporating a small SiT5358 eval-PCB board into my bench test > > >> gear for phase locking to? I am also wondering which of the > > >> SuperStratum3 TCXO chips might be the best choice for a project > > >> like this? > > >> > > >> Any feedback on this is most welcome! > > >> > > >> Mike Baker > > >> Gainesville/Micanopy, Florida > > >> ***************** > > >> > > >> > > >> > > >> _______________________________________________ > > >> time-nuts mailing list -- time-nuts@lists.febo.com > > >> To unsubscribe, go to > > >> http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com > > >> and follow the instructions there. > > >> > > > _______________________________________________ > > > time-nuts mailing list -- time-nuts@lists.febo.com > > > To unsubscribe, go to > > http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com > > > and follow the instructions there. > > > > > > > > > _______________________________________________ > > time-nuts mailing list -- time-nuts@lists.febo.com > > To unsubscribe, go to > > http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com > > and follow the instructions there. > > > _______________________________________________ > time-nuts mailing list -- time-nuts@lists.febo.com > To unsubscribe, go to > http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com > and follow the instructions there. >

Maybe good performance in jitter and air flow. But more power(SIT535x 45mA) than TCXO(TG5032 5mA). Weidong Wang > 主题: Re: [time-nuts] Interesting 1-60 MHz =/- 50 ppb Stratum-3 TCXO chip > > Looking at the datasheet it doesn't look like you'd win any ADEV > competitions with it but it's small and the DCTXCO version would be nice to > use the I2C interface and it says frequency control resolution as low as 5 > ppt. It has uses I can see. > > Bill > > On Fri, May 1, 2020, 5:50 PM Richard Solomon <dickw1ksz@gmail.com> wrote: > > > Been there, did a search on the part number and came up empty. > > > > They did have a "Request Samples" button so I filled out the form. Let's > > see what happens. > > > > 73, Dick, W1KSZ > > > > On Fri, May 1, 2020, 5:40 PM jimlux <jimlux@earthlink.net> wrote: > > > > > On 5/1/20 5:00 PM, Richard Solomon wrote: > > > > Where do you buy these ? Their web site was not too illuminating. > > > > > > > > > > > > > digikey and mouser carry a lot of SiTime parts, including eval boards. > > > > > > > > > > Tnx, Dick, W1KSZ > > > > > > > > On Fri, May 1, 2020, 4:31 PM mpb45@clanbaker.org <mpb45@clanbaker.org> > > > > wrote: > > > > > > > >> Hello, time Nutters-- > > > >> > > > >> I have been phase locking the freq counters in my HP 6-GHz VNA, > > > Tektronix > > > >> spectrum analyzer and bench freq counter to the 10 MHz signal from > > > >> a Trimble Thunderbolt via a 4-port distribution box and long coax > > cables > > > >> to each of the instruments. This works well but is a pain in the tush > > > >> connecting to long coax cables when the bench test gear are moved > > > around. > > > >> > > > >> A friend suggested looking into some MEMS TCXO's made by SiTime to > > > >> do this with. SiTime offers a wide variety of Stratum-3 TCXO chips. > > > One > > > >> of them is the SiT5358 which is spec'd at 0.05 ppm from 1 to 60 MHz. > > > >> > > > >> https://www.sitime.com/products/super-tcxos/sit5358 > > > >> > > > >> I am wondering what any feedback thoughts might be on this from > > > >> the Time-Nuts gang? An eval-PCB board for the SiT5358 chip is > > > >> available. What say the Time-Nutters gang about this approach for > > > >> incorporating a small SiT5358 eval-PCB board into my bench test > > > >> gear for phase locking to? I am also wondering which of the > > > >> SuperStratum3 TCXO chips might be the best choice for a project > > > >> like this? > > > >> > > > >> Any feedback on this is most welcome! > > > >> > > > >> Mike Baker > > > >> Gainesville/Micanopy, Florida > > > >> ***************** > > > >> > > > >> > > > >> > > > >> _______________________________________________ > > > >> time-nuts mailing list -- time-nuts@lists.febo.com > > > >> To unsubscribe, go to > > > >> http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com > > > >> and follow the instructions there. > > > >> > > > > _______________________________________________ > > > > time-nuts mailing list -- time-nuts@lists.febo.com > > > > To unsubscribe, go to > > > http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com > > > > and follow the instructions there. > > > > > > > > > > > > > _______________________________________________ > > > time-nuts mailing list -- time-nuts@lists.febo.com > > > To unsubscribe, go to > > > http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com > > > and follow the instructions there. > > > > > _______________________________________________ > > time-nuts mailing list -- time-nuts@lists.febo.com > > To unsubscribe, go to > > http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com > > and follow the instructions there. > > > _______________________________________________ > time-nuts mailing list -- time-nuts@lists.febo.com > To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com > and follow the instructions there.

On Fri, May 1, 2020 7:07 pm, mpb45@clanbaker.org wrote: > A friend suggested looking into some MEMS TCXO's made by SiTime to > do this with. SiTime offers a wide variety of Stratum-3 TCXO chips. > One of them is the SiT5358 which is spec'd at 0.05 ppm from 1 to 60 MHz. They also have a small OCXO which is basically one of the TCXO devices in a small oven: https://www.sitime.com/products/programmable-ocxos > I am wondering what any feedback thoughts might be on this from > the Time-Nuts gang? They seem to be relatively decent TCXO devices, but they are programmable, i.e. they use a fractional PLL type technique, so close offset phase noise is not great compared to a traditional quartz device. The small size makes the temperature compensation really fast, and the low mass makes the devices relatively low acceleration sensitive. SiTime has some graphs showing frequency change when a fan is turned on and off blowing across the device, and frequency change under various acceleration conditions. I am not sure of the cost of the devices. If you are not cramped for space and power in your test equipment use case you should see how the cost compares to a traditional low cost quartz OCXO (or maybe even TCXO if the accuracy meets your needs in your lab environment, i.e. I don't expect your lab will vary much more than 10C to 30C even if you were to leave the house for a couple of weeks). -- Chris Caudle