Re: [time-nuts] More on SiLabs 5340

On 1/29/18 3:37 PM, Mark Goldberg wrote: Reference my earlier postings titled "SI532X Chips Close In Spurs (Somewhat Long)". There are many sets of register values that will get you the same output frequency and the clock builder may not give you an optimal set for phase noise and spurs. I

Re: [time-nuts] More on SiLabs 5340

Reference my earlier postings titled "SI532X Chips Close In Spurs (Somewhat Long)". There are many sets of register values that will get you the same output frequency and the clock builder may not give you an optimal set for phase noise and spurs. I created a spreadsheet to calculate other sets of

Re: [time-nuts] GPS Jamming

Yo Gary! On Fri, 26 Jan 2018 07:57:02 -0700 Gary Neilson wrote: > Don't know if this has be posted before or not. Also don't know if > this will affect timing info. I am a commercial pilot in Bend, OR. There is a lot of 'GPS testing' going on in Fallon, NV. About every

Re: [time-nuts] More on SiLabs 5340

On 01/29/2018 04:54 PM, Chris Caudle wrote: On Mon, January 29, 2018 2:38 pm, John Ackermann N8UR wrote: The close-in phase noise is quite amazing, but the floor is much worse than in free-run mode. That phase noise plot doesn't look quite right, what PLL bandwidth did you set? Sorry for

[time-nuts] SA22.c (and other) interface boards

I got in my prototypes for the SA22.c interface board from OSHPARK. It seems to be working well. It has a square to sine wave filter (thanks Charles!) since the SA22 only outputs an ACMOS square wave. There is tiny but of fuzz on the peaks of the sine wave. There is a jumper for routing

Re: [time-nuts] More on SiLabs 5340

On Jan 29, 2018, 4:54 PM, at 4:54 PM, Chris Caudle wrote: >On Mon, January 29, 2018 2:38 pm, John Ackermann N8UR wrote: >> The close-in phase noise is quite amazing, but the floor is much >worse >> than in free-run mode. > >That phase noise plot doesn't look quite right,

Re: [time-nuts] More on SiLabs 5340

On Mon, January 29, 2018 2:38 pm, John Ackermann N8UR wrote: > The close-in phase noise is quite amazing, but the floor is much worse > than in free-run mode. That phase noise plot doesn't look quite right, what PLL bandwidth did you set? -- Chris Caudle

Re: [time-nuts] More on SiLabs 5340

On Mon, January 29, 2018 2:38 pm, John Ackermann N8UR wrote: > to do, though, was feed 10 MHz into the "Input 0" port which apparently > disciplines the free-running crystal. It doesn't discipline the crystal oscillator, the crystal oscillator is multiplied up and used as the clock to run a DDS

Re: [time-nuts] More on SiLabs 5340

Hi There may be “tweaks” to get the noise shaping working better on the 10 MHz input. Some PLL chips have pre-multipliers for the reference to improve things…. the magic apparently works better with a fast input …(and yes, there are good reasons why) Bob > On Jan 29, 2018, at 3:38 PM, John

Re: [time-nuts] CSAC Project(was CSAC purchase)

Hi Questions are good, it’s how you figure things out. We’re talking about a “practical” timing device design. It’s not as crazy a topic as it might seem. Some basic math: You get to a million seconds at about 11.6 days. A millisecond error over that period is one ppb. If you are off 1 ppb

Re: [time-nuts] CSAC Project(was CSAC purchase)

Bob; I see what you are saying. I will wait until I get the chips d more before asking more questions. Ronald Hi As mentioned multiple times in the archives. As you get into the single digit milliseconds, the human eye simply can’t keep up. A watch that is 1 ns off and one that is 1

Re: [time-nuts] CSAC Project(was CSAC purchase)

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Re: [time-nuts] GPS Jamming

This has been going on a long time. http://defense-update.com/products/g/gps-ajr.htm I was involved with testing this in the field years earlier. Wes On 1/26/2018 7:57 AM, Gary Neilson wrote: Don't know if this has be posted before or not. Also don't know if this will affect timing info.

Re: [time-nuts] GPS Jamming

I thank Adrian was being sarcastic :) -Original Message- From: time-nuts [mailto:time-nuts-boun...@febo.com] On Behalf Of Azelio Boriani Sent: 29 January 2018 10:00 To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] GPS Jamming Wasn't the selective

Re: [time-nuts] GPS Jamming

Wasn't the selective availability an accuracy degradation system? On Mon, Jan 29, 2018 at 10:55 AM, Adrian Godwin wrote: > What a pity nobody thought to include an accuracy degradation system into > GPS itself, for use when you don't want the enemy to benefit from it. > >

Re: [time-nuts] GPS Jamming

What a pity nobody thought to include an accuracy degradation system into GPS itself, for use when you don't want the enemy to benefit from it. And how odd to show off your secret jamming technology in a major scheduled exercise, so the Bad Guys can study it. On Fri, Jan 26, 2018 at 2:57 PM,

[time-nuts] GPS Jamming

Don't know if this has be posted before or not. Also don't know if this will affect timing info. GPS Jamming I am on the very edge of their coverage map. Gary