[time-nuts] GPS SV74/PRN04 now trackable...

Since I figure several people here will be interested, I thought I'd note that the first of the new GPS Block III satellites (SV74, launched last December) has been assigned PRN04, and is now transmitting the L1 ranging code and valid LNAV frames. It's currently set unhealthy, so most GPS

Re: [time-nuts] A simple sampling DMTD

Dear all, Attila got me thinking with his remark: I am a bit astonished by the high noise level you have. I would have > expected > this to yield something below 1ps, judging from what we got from what > Nicolas > acheived in his work on the sine exitation based TIC[1]. ...and I realised that

Re: [time-nuts] Raspberry Pi TCXO Hat

Hi Congratulations !!! You have just invented Sync-E. Seems like *maybe* somebody beat you to it …. https://en.wikipedia.org/wiki/Synchronous_Ethernet Turns out it is one way to get *frequency* to a device (like a cell site). Just how well

[time-nuts] For Sale: SRS SR620

I have a very clean, working SR620 for sale. Would like to sell for $600+ shipping. Please contact off-list if interested. -Brian, WA1ZMS wa1zms at att dot net ___ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to

Re: [time-nuts] Raspberry Pi TCXO Hat

Richard Laager writes: > I stumbled across this product listing: > https://www.teradak.com/products/115.html That site red-zones my BS detector… > It's a Pi hat that contains two TCXOs, one at 19.2 MHz for the CPU and > one at 25 MHz for the Ethernet controller. The one for the Ethernet

Re: [time-nuts] Raspberry Pi TCXO Hat

artgod...@gmail.com said: > Also - I'm unsure of the benefit of having a TCXO for the ethernet clock > unless it runs so hot that ethernet can't sync using the usual uncompensated > crystal. Is there some benefit I'm not seeing ? I had similar thoughts. One could imagine using Ethernet to

Re: [time-nuts] Raspberry Pi TCXO Hat

The Pi 4 launched with issues, including heat issues, but has been improved. The improvements in power usage are supposed to reduce the heat issues. A new bootloader was released. It includes that by default, power will be maintained on the power pins, so power is maintained on hats.

Re: [time-nuts] Raspberry Pi TCXO Hat

Also - I'm unsure of the benefit of having a TCXO for the ethernet clock unless it runs so hot that ethernet can't sync using the usual uncompensated crystal. Is there some benefit I'm not seeing ? On Sat, Nov 2, 2019 at 12:35 PM Adrian Godwin wrote: > > > On Sat, Nov 2, 2019 at 11:59 AM David

Re: [time-nuts] Raspberry Pi TCXO Hat

On Sat, Nov 2, 2019 at 11:59 AM David J Taylor via time-nuts < time-nuts@lists.febo.com> wrote: > > Given that the path to the outside Ethernet world on both of those models > is > via a USB controller, I would expect to see very little improvement with a > TCXO in a constant temperature

Re: [time-nuts] Raspberry Pi TCXO Hat

rlaa...@wiktel.com said: > I'm curious if this would provide any meaningful improvement in system clock > accuracy, for NTP, if I'm already a GPS PPS hat. If there's a reasonable > chance this could be interesting, I'm thinking about ordering a couple and > "sacrificing" a Pi 3 and/or Pi 4.

Re: [time-nuts] Raspberry Pi TCXO Hat

I stumbled across this product listing: https://www.teradak.com/products/115.html It's a Pi hat that contains two TCXOs, one at 19.2 MHz for the CPU and one at 25 MHz for the Ethernet controller. It's a rather permanent modification, as you have to desolder the stock crystals and replace them