Re: [time-nuts] GPS for Nixie Clock

if you are considering the MAX Series of chip i just posted this version I’ve been using for my own NTP sources for pool.org servers board i designed for the beablebone should be cheap enough to get made if someone wants to, or if you are in Australia i can ship boards cheap enough

Re: [time-nuts] GPS for Nixie Clock

The USB is just for fooling around out side of the clock, getting familiar with what it can do. The FPGA can handle the serial port interface just fine. BTW the original has cheap slow microcontroller (don't even remember what it is now) I'm replacing it with a modern Altera MAX-10 FPGA for

[time-nuts] GPS for Nixie Clock

No, not really. I would get one of these... 1/3 the price, comes with antenna.A timing receiver is way overkill for a clock. USB is a pain for microcontrollers to work with. Get it working with with the 8M, upgrade later to the M8T if you feel the need.

Re: [time-nuts] GPS for Nixie Clock

Hi The T version makes it easy to get at the sawtooth correction on the pps. That lets you go from 10’s of ns on the pps to below 1 ns. All of that is a bit beyond the response speed of a Nixie tube.:). It also takes an MCU to work out what’s going on and some way to incorporate the correction

Re: [time-nuts] GPS for Nixie Clock

I take it the "T" is a time specific version, I see there is also a NEO M8T, I presume this include the position hold etc? This: http://www.csgshop.com/product.php?id_product=218 Seems like an interesting board with a NEO-M8T, a UF.L antenna connector. The little breakout board gives a direct

Re: [time-nuts] GPS for Nixie Clock

Last year I created GPS-based Nixie clock for myself. After all the considerations I decide to use GPS receiver with external antenna. Not so aesthetic, but more reliable for me. I was using DS32xx chip as a clock. And GPS plus 1PPS output from GPS to set/sync that DS32xx. So, GPS module is

Re: [time-nuts] GPS for Nixie Clock

On 7/10/2016 11:44 PM, Hal Murray wrote: Here is one to consider: Adafruit Ultimate GPS Breakout - 66 channel w/10 Hz updates - Version 3 https://www.adafruit.com/product/746 I'm a fan of the Adafruit Ultimate GPS breakout. One has been at the heart of my GPS-based NTP time server here

[time-nuts] GPS for Nixie Clock

I have both. They seem to work well and appear to be genuine Ublox stuff. I highly suspect that somebody in China bought, for dirt cheap, a product production line closeout of something that used LEA-6T modules and stuffed them in those drone gizmos... there is no reason to use an

Re: [time-nuts] A different way to think about time dilation?

Chris, if you want to verify the mathematical operations you can send them to me and my spouse and I will check them for you. As to whether you chose the right equations, you probably need the help of a physicist. Bill On Monday, July 11, 2016, Chris Albertson wrote:

Re: [time-nuts] GPS for Nixie Clock

Mark, I see some LEA-6T units and some NEO-M8N units.  Has anyone done any timing tests on these since they came up last time on time-nuts?  The prices just seem to be way on the low side. Bob  - AE6RV.com GFS GPSDO list:

[time-nuts] HP5370 power supply measurements

Inspired by the recent thread about power trouble, I spent an hour to actually measure why the HP5370 gets so warm as it does. I'm running on 230VAC here, with the 230/240VAC power setting. With A6 and A7 removed and turned off: PAC= 4.2 W That is the loss in the transformer and rectifiers,

[time-nuts] GPS for Nixie Clock

One thing to consider about using a module with a built-in ceramic patch antenna is that usually the antenna cannot be removed and the modules have no support for an external antenna. If you do have problems getting a signal it can be very difficult to add an external antenna. You might want

Re: [time-nuts] A different way to think about time dilation?

What I really asked was "does the math work?". So far I suspect it does. I don't think what I wrote contradicts anything in any conventional text book. What I'm looking for is to be proven wrong Yes I know about velocity driven time dilation. Let's stick with Special Relativity for now and

Re: [time-nuts] GPS for Nixie Clock

Hi For $15 to $45 a number of places will sell you a uBlox receiver card that runs off of 5V and has an internal antenna. They are quite sensitive and have a timing output. They are plenty good enough for what you are trying to do. The practical issue is getting good enough GPS signals at an

Re: [time-nuts] GPS for Nixie Clock

That Adafruit Ultimate GPS Breakout works quite well indoors. I live in an older house with tongue & groove roof topped by slate and plaster & lath walls with thick stone on the outside. That GPS usually has 8+ satellites anywhere in the house except the basement. Basement not as good, often

Re: [time-nuts] GPS for Nixie Clock

From: Hal Murray That's an old receiver. Modern receivers are much more sensitive and much more likely to work indoors. I suggest getting a modern chip. Some of them come packaged with an antenna. Then you can play around with it from a PC, arduino, or Raspberry Pi to figure out what you

[time-nuts] GPS for Nixie Clock

The Jupiter receiver defaults to Motorola output, but can be switched to Zodiac. It talks at 9600:8:N:1 Frankly, it is the wrong receiver to use, particularly with an indoor antenna. I would go with a modern GPS receiver with standard NMEA output and a 1PPS signal. They are MUCH more

Re: [time-nuts] GPS for Nixie Clock

Well, it's late and I've nothing else to do. I sympathize with you, but my Nixie clock is a computer display made years ago by Jag Air Clockvault. One of these Windows OS upgrades is going to refuse to run it. You say it has an FPGA for the display. What provides the numbers to be formatted? A

Re: [time-nuts] GPS for Nixie Clock

johnswens...@comcast.net said: > I'm looking into a TU36-D400-020 receiver. > What antenna to use? I would prefer something mounted inside the case. It > is wood so an internal antenna will hopefully work. The board comes with a > pigtail but it is not SMA. That's an old receiver. Modern