Re: [time-nuts] Down-conversion to IF and sampling

Am 11.01.2018 um 10:57 schrieb Stephan Sandenbergh: I plotted the result for a few oscillator drift rate values. It seems that the 'extra' error introduced by the imperfect ADC time base would be negligible for many applications for OCXO drift rates or better. This is likely the reason why it is

Re: [time-nuts] Down-conversion to IF and sampling

Hi, A happy New Year to you all! Also, thank you to everyone who replied in such detail. It is always a privilege being able to bounce ideas off of the time-nuts community. I have found that it is often the case that the error introduced by ADC sampling is ignored. However, there is an error

Re: [time-nuts] Down-conversion to IF and sampling

On Sat, 23 Dec 2017 21:00:39 + Stephan Sandenbergh wrote: > I guess I'm just worried that I might be missing something obvious here? > And I know there is no better place to ask such a question other than on > time-nuts :) No, your derivation is correct. Though

Re: [time-nuts] Down-conversion to IF and sampling

Hi, The goal would be to be able to tell what the phase and frequency of the down-converted and sampled signal is. So no modulation on the carrier (for now). So given the RF signal is perfect sinusoid, and given that you know the parameters x(t) = xo + yot (time and fractional frequency offset)

Re: [time-nuts] Down-conversion to IF and sampling

Hi What is the Time Nut goal here? Are we after the carrier frequency or after the modulation on the signal? Bob > On Dec 23, 2017, at 10:46 AM, Stephan Sandenbergh > wrote: > > Oops, I noted a sign error in the previous diagram. The attached seems > better... > > On

Re: [time-nuts] Down-conversion to IF and sampling

Oops, I noted a sign error in the previous diagram. The attached seems better... On Sat, Dec 23, 2017 at 4:46 PM Stephan Sandenbergh wrote: > Hi All, > > Consider the following very common scenario: A perfect RF signal is > heterodyne down-converted to baseband using an

Re: [time-nuts] Down-conversion to IF and sampling

It would be (as you point out) a bad idea to have the the ADC sampling rate to be exactly the same as the downconversion oscillator. In many cases they would both be derived from the same master oscillator. But the ratios would be consciously chosen to not be simple integer multiple relations so

Re: [time-nuts] Down-conversion to IF and sampling

Hi Assuming you are trying to extract timing from the signal (time ticks on WWVB), the downconversion really does not matter. The ADC samples are what will “tag” your time data. If you are trying to extract frequency from the signal (you are after the center frequency of WWVB) then both the

[time-nuts] Down-conversion to IF and sampling

Hi All, Consider the following very common scenario: A perfect RF signal is heterodyne down-converted to baseband using an offset oscillator. Let's assume this oscillator has x(t) = xo + yot. This produces a time and frequency offset baseband signal. Then, this baseband signal is coherently ADC

Re: [time-nuts] Down under Time Nuts Tsunami's

jim77...@gmail.com said: I always use 09:44 (UT+11) to remove all ambiguity. Well, by the time your message got there, it said: Date: Thu, 8 Oct 2009 12:52:02 +1100 What was it when it left your end? -- These are my opinions, not necessarily my employer's. I hate spam.

Re: [time-nuts] Down under Time Nuts

- Original Message - From: Magnus Danielson mag...@rubidium.dyndns.org Some of you actuallly work in the field I gather. :) snip- Some of us work in it- but most of us just play there. If you play hard enough, sometimes you get paid... DaveB, NZ

[time-nuts] Down under Time Nuts

Ray, There are several of us down here on the list. I can think of several in AU and at least three or four in NZ. If they don't identify themselves to you, let me know. We also know the whereabouts of some nice gear. Regards, Murray Greenman ZL1BPU www.qsl.net/zl1bpu

Re: [time-nuts] Down under Time Nuts

Dear Murray, Murray Greenman wrote: Ray, There are several of us down here on the list. I can think of several in AU and at least three or four in NZ. If they don't identify themselves to you, let me know. At least one list member is living on Tasmania. He is active on the list, so I think

Re: [time-nuts] Down under Time Nuts

: Thu, 8 Oct 2009 06:49:46 +1300 From: Murray Greenman murray.green...@rakon.com Subject: [time-nuts] Down under Time Nuts To: time-nuts@febo.com Message-ID: be50c3a72eba61449c804b2c8b4ae38101ebc...@neptune.rakon.net Content-Type: text/plain; charset=us-ascii Ray, There are several

Re: [time-nuts] Down under Time Nuts Tsunami's

I hope there aren't any timenuts in North Queensland. There is a Tsunami warning issued at 09:44 EDT today for the Great Barrier Reef and Bowen to St. Lawrence. Nic There are several of us down here on the list. I can think of several in AU and at least three or four in NZ. If they don't

Re: [time-nuts] Down under Time Nuts Tsunami's

Hmmm. I'm in a pedantic mood today, but I think this is worth raising. 09:44 EDT - what is that? I'm presuming Nic (emailing from bigpond and presumably in Australia) means Eastern Daylight Time which I assume he means Eastern Standard Time + 1 hour for daylight savings. I thought it was suppoed

Re: [time-nuts] Down under Time Nuts Tsunami's

OK I've done some research and may have jumped the gun. (Note to self - do research before posting) There seems to be a wide variety of conventions out there on Australian time zones. The best source I could find was http://www.australia.gov.au/about-australia/our-country/time which is probably

Re: [time-nuts] Down under Time Nuts Tsunami's

Yes Jim I am in Sydney Australia and we are UT+11. To me EDT and AEST mean the same thing. AEST is most probably more correct to use in a forum such as this. I work in Television and our media people use EDT. Regards Nic, PS the Tsunami warning has been withdrawn. Hmmm. I'm in a pedantic mood

Re: [time-nuts] Down under Time Nuts Tsunami's gear.

. Thanks Ray VK4TFT --- On Thu, 8/10/09, Nic McLean mcle...@bigpond.com wrote: From: Nic McLean mcle...@bigpond.com Subject: Re: [time-nuts] Down under Time Nuts Tsunami's To: 'Discussion of precise time and frequency measurement' time-nuts@febo.com Received: Thursday, 8 October, 2009, 10:29 AM I

[time-nuts] Down ??

I, also, can't access anything at www.febo.com Had ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.

Re: [time-nuts] Down ??

It seems to be working fine for me at this time. REM -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] Behalf Of Had Sent: Monday, May 26, 2008 12:57 PM To: time-nuts-febo.com Subject: [time-nuts] Down ?? I, also, can't access anything at www.febo.com Had