[time-nuts] SI5328

In my opinion the SI 5328 is worth looking at for time nut application, like offset frequency. My problem is solder ability. Does any one know a source for an evaluation board or as an alternative a source that would do a small volume assembly? Bert Kehren

Re: [time-nuts] SI5328

Does anybody know what's in the DSPLL box? It may be in the data sheet(s), but I haven't found it. -- These are my opinions. I hate spam. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to

Re: [time-nuts] SI5328

There are many small volume assmebly houses available. But the problem is that you will have setup costs in the order of at least 100-300€, even if you go to China. So, producing lots of less than 10 is not economical, probably should aim for 100. I recently ran across MacroFab

Re: [time-nuts] CSAC purchase

Magnus: I wanted one since they were announced in 2005, AFAIR. Incorporated into a watch was my first choice, but that price is out of range. A portable old cell phone size version is next. Ronald What exactly motivated specifically CSAC for you? There might be other cheaper

[time-nuts] Symmetricom TimeSource 2500

Reading the recent discussion about GPS receivers for a Stratum 1 NTP server caused me to reflect on the Symmetricom TimeSource 2500 I have been using for years as a GPS-based frequency reference. I only turn this on for a couple of days when it is likely I will need it, but am not sure if

Re: [time-nuts] Suggestion for a timing GPS receiver (Trimble / Ublox / other?)

On Mon, 22 Jan 2018 16:38:01 +0100 Paride Legovini via time-nuts wrote: > I plan to build a decent GPS/GNSS-based Stratum 1 NTP server, and I'm > looking for a good and possibly affordable timing GPS receiver. > > As far as I can tell there are a few common options. One is

Re: [time-nuts] SI5328

On Mon, 22 Jan 2018 08:18:29 -0600 "Chris Caudle" wrote: > The DSP loop filter gives a really wide range of loop bandwidth, down to > fractional Hz for some parts. Using a DDS for the VCO gives a lot of > flexibility in output frequency selection, but means that there can

[time-nuts] Suggestion for a timing GPS receiver (Trimble / Ublox / other?)

I put my layout for a GPS RS-232 level converter board up on OSHPARK's shared projects. It has places for mounting the Trimble Res-T, the Adafruit Ultimate GPS, and the CN06 (Ublox 6M). The RS-232 circuit has a selectable polarity 1PPS ouput. You can use a3.3V or 5V regulator or there is a

Re: [time-nuts] Symmetricom TimeSource 2500

On Mon, 22 Jan 2018 13:17:40 -0500 Bruce Hunter via time-nuts wrote: > A disappointment of the 2500's architecture is that it burns an SRI PRS-10 in > the background as a backup in case of the loss of GPS. This seems wasteful > to me as the operating life of the PRS-10

Re: [time-nuts] SI5328

On Mon, Jan 22, 2018 at 4:34 AM, ew via time-nuts wrote: > In my opinion the SI 5328 is worth looking at for time nut application, > like offset frequency. My problem is solder ability. Does any one know a > source for an evaluation board or as an alternative a source that

Re: [time-nuts] SI5328

Hello, here you can find the source of the development board with the Silicon price and the neccessary software package: https://www.silabs.com/products/development-tools/timing/clock/si5328-evb-development-kit - Chris Am 22.01.2018 um 12:34 schrieb ew via time-nuts: In my opinion the SI

Re: [time-nuts] SI5328

Bert, please look at the following manual: https://www.silabs.com/documents/public/user-guides/Si5328EVB.pdf - Chris Am 22.01.2018 um 12:34 schrieb ew via time-nuts: In my opinion the SI 5328 is worth looking at for time nut application, like offset frequency. My problem is solder ability.

Re: [time-nuts] Time interval measurement vs dual mixer method

Hello to the group, Thanks for interesting discussion. I found a nice plot in"Measurement, Instrumentation, and Sensors Handbook, Second Edition", ( John G. Webster,Halit Eren), at 42-24 page. It shows that in short term stability (tau 1 - 10 s) dual mixer method is most sensible, in long

Re: [time-nuts] CSAC purchase

On 1/22/18 12:05 PM, Ronald Held wrote: Bob: OCXO and TCXO are larger then the CSAC? How much more power would they need to get within a factor of ten to the 1.5s/1000 years? Ronald OCXO and TCXO are both available smaller than the CSAC (particularly tcxo). I'm

Re: [time-nuts] Suggestion for a timing GPS receiver (Trimble / Ublox / other?)

Yo Paride! On Mon, 22 Jan 2018 16:38:01 +0100 Paride Legovini via time-nuts wrote: > I plan to build a decent GPS/GNSS-based Stratum 1 NTP server, and I'm > looking for a good and possibly affordable timing GPS receiver. Before you bother looking at any GPS, you need to

Re: [time-nuts] CSAC purchase

Hi For something portable, the good old RBXO approach might well be worth considering. Bob > On Jan 22, 2018, at 3:05 PM, Ronald Held wrote: > > Magnus: > I wanted one since they were announced in 2005, AFAIR. Incorporated > into a watch was my first choice, but that

Re: [time-nuts] CSAC purchase

Hi I’m guessing there was a question to me that somehow got lost in the world of ones and zeros …. My comment was in terms of temperature stability. The CSAC has a temp stability specification of +/-4x10^-10 over -10 to +70C. There are TCXO’s that will get below 5x10^-9 over that range and

Re: [time-nuts] Suggestion for a timing GPS receiver (Trimble / Ublox / other?)

Paride Legovini via time-nuts writes: > I plan to build a decent GPS/GNSS-based Stratum 1 NTP server, and I'm > looking for a good and possibly affordable timing GPS receiver. Unless you plan to use the timing receiver for some other function, it really is overkill for the purpose of setting up

Re: [time-nuts] SI5328

It might be possible to hand solder the 36-pin 0.5mm pitch QFN to this Schmartboard product: http://schmartboard.com/schmartboard-ez-qfn-36-pins-5mm-pitch-32-pins-65mm-pitch-2-x-2-grid-202-0043-01/ One question is would the die attach pad, which apparently needs grounding, get enough heat

Re: [time-nuts] Suggestion for a timing GPS receiver (Trimble / Ublox / other?)

Paride The LEA-5T differs from other devices only that it has saw tooth information that can be used for correction or in a loop' I did a board and have one with variable delay using the 5T. Looking at the picture I do not even see an output for that information. Any later standard $10 module

Re: [time-nuts] Suggestion for a timing GPS receiver (Trimble / Ublox / other?)

Why not consider a more recent current UBlox module? e.g. the M8T  https://www.u-blox.com/en/product/neolea-m8t-series A quick internet search will find several suppliers of ready made boards/modules... On 22/01/2018 15:38, Paride Legovini via time-nuts wrote: > Dear fellow nuts, > > I plan to

[time-nuts] Suggestion for a timing GPS receiver (Trimble / Ublox / other?)

Dear fellow nuts, I plan to build a decent GPS/GNSS-based Stratum 1 NTP server, and I'm looking for a good and possibly affordable timing GPS receiver. As far as I can tell there are a few common options. One is the Trimble Resolution T (or SMT), that should be good and proven. The major

Re: [time-nuts] SI5328

On Mon, January 22, 2018 6:42 am, Hal Murray wrote: > Does anybody know what's in the DSPLL box? Basically a PLL implemented with some kind of DDS for the VCO and DSP for the loop filter.

Re: [time-nuts] Suggestion for a timing GPS receiver (Trimble / Ublox / other?)

Hi It is doubtful that the pc board has an RS-232 to TTL converter onboard. The module it’s self “talks” TTL levels rather than RS-232 levels. RS-232 to TTL adapters are dirt cheap and easy to find on eBay. Make sure you get one that has control lines along with the basic RX and TX functions.

Re: [time-nuts] SI5328

Hoi Bert, On Mon, 22 Jan 2018 06:34:42 -0500 ew via time-nuts wrote: > In my opinion the SI 5328 is worth looking at for time nut application, like > offset frequency. My problem is solder ability. Does any one know a source > for an evaluation board or as an alternative a