[time-nuts] Fwd: "NUT4ANT is a four-channel, all-frequency, GNSS RF-to-bits receiver"

Perhaps of interest, forwarded from CrowdSupply. -Bill > Begin forwarded message: > > From: Crowd Supply > Subject: A satellite-guided floating Panopticon bristling with the talons of > freedom > Date: September 22, 2016 at 2:56:38 PM PDT > To: > Reply-To: Cro

Re: [time-nuts] Lucent RFTFm-II-XO

One additional point: Many ordinary PC sound cards do not have proper input filtering, so anything as fast as a PPS pulse will cause severe aliasing, even after it has been voltage-clamped to a level that will not overload the ADC. (Thus my mention of LP filtering under pulse conditioning.)

Re: [time-nuts] Lucent RFTFm-II-XO

Bill wrote: If you could, would you see if you can take the pps out of your lucent box and use it to sync the pc sound card clock via continuous calibration for using SL for fx measurements. Maybe by lucent box pps output is bad. The PPS directly out of most GPSDOs is too fast for sound c

[time-nuts] Symmetricom bc750 AKA PCIe-1000 PTP

Hello, I am wandering if anybody had the same issue with Symmetricom PCIe-1000 PTP controller. Basically this is the PCIe card which suppose to talk with GrandMaster by PTP. I had small issue to assemble the Linux package for the most recent Linux kernel (4.4.0). But eventually I did that.

Re: [time-nuts] Lucent RFTFm-II-XO

Hi Charles, Thanks for info - makes sense. With SL Lucent pulse did not work - Jackson unit did with no mods. Guess I was lucky! 73, Bill, WA2DVU -Original Message- From: time-nuts [mailto:time-nuts-boun...@febo.com] On Behalf Of Charles Steinmetz Sent: Thursday, September 22, 2016

Re: [time-nuts] Lucent RFTFm-II-XO

You may even be lucky enough to see brief periods of phase reversal on some of the amplifiers on the input chain, adding more edges. On Thu, Sep 22, 2016 at 3:47 PM, Charles Steinmetz wrote: > Bill wrote: > > If you could, would you see if you can take the pps out of your lucent >> box and use

Re: [time-nuts] Thunderbolt spurs on 10MHz output at 100Hz and 200Hz from signal.

On Thursday, September 22, 2016 01:37:02 AM Gerhard Hoffmann wrote: > Am 22.09.2016 um 00:24 schrieb Bruce Griffiths: > > Another issue is the requirement to trim the current sink for low output > > offset. > > And _that_ FET is made from Unobtainium. > > > If one takes advantage of the fact tha

Re: [time-nuts] Lucent RFTFm-II-XO

Hi If the PPS is going to run into a run of the mil sound card, the pulse width likely will need to be > (1/20,000) s. That will require a one shot to do. The Lucent PPS is a bit narrower than that, as is the output of a lot of GPSDO’s. Bob > On Sep 22, 2016, at 2:41 PM, Bill Riches wrote: >

Re: [time-nuts] Lucent RFTFm-II-XO

Hi Bob, If you could, would you see if you can take the pps out of your lucent box and use it to sync the pc sound card clock via continuous calibration for using SL for fx measurements. Maybe by lucent box pps output is bad. 15625 from 3586 goes in one channel and pps goes into the other ch

Re: [time-nuts] Lucent RFTFm-II-XO

Hi I have had no problem using the PPS out of any of the Lucent boxes. They trigger counters fine and a one shot stretches them to any length you might need. Bob > On Sep 22, 2016, at 8:31 AM, Bill Riches wrote: > > Be careful of the pps output from the dual lucent boxes. Tried to use it to

Re: [time-nuts] Lucent RFTFm-II-XO

Be careful of the pps output from the dual lucent boxes. Tried to use it to sync SL and found that it is a weird non-standard pulse and would not work even with a pulse stretcher as it looked too narrow. I use the pps output from a Jackson unit and it syncs SL fine. 73, Bill, WA2DVU Cape May

Re: [time-nuts] Lucent RFTFm-II-XO

This is your link: anyway, the J8 connector pinout: KS-24361 J8 - Diagnostic serial port with SCPI 9600,N,8,1 RXD+ 4 RXD- 8 TXD+ 5 TXD- 9 GND 3, 7 J6 RS422/PPS RXD+ 4 RXD- 8 no information on this RX line TXD+ 5 TXD- 9