Re: [time-nuts] WWVB for Time Nuts

On 8/9/14, 9:36 PM, Lee Mushel wrote: Jeeze, Brooke, I wish you hadn't brought up the possible patenting of Time Delay Beam steering antennas! I wonder if my highly esteemed SDR radio which I think uses some such technology, is illegal? long since expired.. (but, I gotta say that a lot of t

Re: [time-nuts] WWVB for Time Nuts

Jeeze, Brooke, I wish you hadn't brought up the possible patenting of Time Delay Beam steering antennas! I wonder if my highly esteemed SDR radio which I think uses some such technology, is illegal? 73 Lee K9WRU - Original Message - From: "Brooke Clarke" To: "Discussion of preci

Re: [time-nuts] VLF Phase-tracking receivers.

On 9 Aug 2014 at 19:17, paul swed wrote: > Ken > All of the phase tracking receivers no longer work due to the new bpsk wwvb > modulation. Hello, Paul. Yes. I knew that WWVB had switched to BPSK, but these receivers were specifically designed to tune to any of the VLF stations between 3 and 99

Re: [time-nuts] VLF Phase-tracking receivers.

Some can. But the big mega power ones here run FSK or in reality MSK about 25-50Hz from what I can tell. The other comment I have is that there no published data on the stability or reference. I could speculate its good but have no idea actually. Would have to build a receiver to figure it out. Reg

Re: [time-nuts] WWVB for Time Nuts

On 8/9/14, 12:27 PM, John Seamons wrote: On Aug 10, 2014, at 5:49 AM, Brooke Clarke wrote: I don't understand how Xtendwave can get patents when their work was partially funded by NIST? We had this discussion a few years back:

Re: [time-nuts] VLF Phase-tracking receivers.

Hi Paul: Are the phase tracking receivers able to receive any VLF stations (like used by the military)? Have Fun, Brooke Clarke http://www.PRC68.com http://www.end2partygovernment.com/2012Issues.html http://www.prc68.com/I/DietNutrition.html paul swed wrote: Ken All of the phase tracking rec

Re: [time-nuts] WWVB for Time Nuts

Hi: When I was in high school I built an oscilloscope from a kit made by Electronic Instrument Co. (EICO). AFAICR Dumont had some patent that the kit avoided. ARAIK you can build any patented device for you own use. The reason I like patents is that they explain many things that books avoid. Ti

Re: [time-nuts] VLF Phase-tracking receivers.

Ken All of the phase tracking receivers no longer work due to the new bpsk wwvb modulation. Certainly if you need accuracy any of the GPSDOs out there are better then the old wwvb receivers. I have a 599 and will hope that the project I have been working on for far to long will allow it to track a

Re: [time-nuts] WWVB for Time Nuts

On 8/9/14, 3:49 PM, Bob Camp wrote: Hi That’s not the way it was presented to me. My understanding is that the case law on proving “individual study” versus “individual use” is a bit murky. I’m certainly no lawyer (thank goodness ..). murky is a good way to describe it... ___

Re: [time-nuts] WWVB for Time Nuts

On Aug 10, 2014, at 5:49 AM, Brooke Clarke wrote: > I don't understand how Xtendwave can get patents when their work was > partially funded by NIST? We had this discussion a few years back: ___

[time-nuts] VLF Phase-tracking receivers.

Hello, I'm new here, but would like to get some advice, if possible. I have been going through my inventory here of items which were given to me in an estate some time ago. Amongst many other things, I find three Tracor or Textran 599 receivers. One 599-CS with its manual, a 599 (no suffix) and

Re: [time-nuts] WWVB for Time Nuts

Hi That’s not the way it was presented to me. My understanding is that the case law on proving “individual study” versus “individual use” is a bit murky. I’m certainly no lawyer (thank goodness ..). Bob On Aug 9, 2014, at 6:38 PM, Jim Lux wrote: > On 8/9/14, 12:56 PM, Bob Camp wrote: >> Hi

Re: [time-nuts] Low noise powersupplies

David, Did you ever get an answer? Original Post: Date: Fri, 08 Aug 2014 00:10:58 +1000 From: David Hooke To: "bruce-cpdlzquo8hwavxtiumw...@public.gmane.org" Subject: Re: [time-nuts] Low noise powersupplies Message-ID: <53e388f2@gmail.com> > Such as? > david > On 7/

Re: [time-nuts] WWVB for Time Nuts

On 8/9/14, 12:56 PM, Bob Camp wrote: Hi Keep in mind that the patent(s) do not keep you from building a part for your own use. AS I understand it, this is not technically true. You can practice the patent to gain an understanding of it for the purposes of inventing something new that is bas

Re: [time-nuts] WWVB for Time Nuts

Hi Doing CPU vs ASIC switch, going from 300 uA to 3 uA can matter a lot when you are on a little battery If you are going to put these in 10,000,000 watches / clocks a month, then saving twenty cents on a chip is a really big deal. Moving twenty cents a chip from your pocket to my pocket is

Re: [time-nuts] WWVB for Time Nuts

On 8/9/14, 10:49 AM, Brooke Clarke wrote: Hi: I've been reading papers by Yingsi Liang who works for Xtendwave and she seems to be the key person developing the new clocks. I've starting collecting info on my web page: http://www.prc68.com/I/Loop.shtml#PhaseMod I don't understand how Xtendwave c

Re: [time-nuts] WWVB for Time Nuts

Time nuts: Here is a prediction of how it could go on the WWVB chip situation. Moors law will under price the custom chip price in small (and even large) volumes. It already has. http://en.wikipedia.org/wiki/Moore%27s_law A WWVB receiver can now be done on an Arduino microprocessor with a lit

Re: [time-nuts] WWVB for Time Nuts

Brooke wrote: I don't understand how Xtendwave can get patents when their work was partially funded by NIST? Just one of the features of the new world of "public-private partnerships," which have been spurred on by government funding cutbacks. There is lots to say about the wisdom of such

Re: [time-nuts] WWVB for Time Nuts

Hi Paul: The key point in my prior message is that the bulk of the effort at Xtendwave is to find ways around the inadequate stability of common watch crystals. If a time nuts quality frequency source is available then the long words can be decoded with simple circuitry. Be sure to check out t

Re: [time-nuts] WWVB for Time Nuts

Bob Indeed I have no plans to sell anything. If I can ever get a digital solution working for wwvb. What I can say is whatever I do will be shared here. For good or bad. Regards Paul WB8TSL On Sat, Aug 9, 2014 at 3:56 PM, Bob Camp wrote: > Hi > > Keep in mind that the patent(s) do not keep you

Re: [time-nuts] WWVB for Time Nuts

Hi Keep in mind that the patent(s) do not keep you from building a part for your own use. Regardless of what they do / do not patent, a TimeNut can still build (and use for themselves) what ever they wish. Now, if you (after careful examination) believe that the privately held patents ke

Re: [time-nuts] WWVB for Time Nuts

Speaking of LORAN C the tests have been dead for about 6 months near as I can tell. Not sure what happened. On Sat, Aug 9, 2014 at 3:45 PM, Charles Steinmetz wrote: > Brooke wrote: > > I don't understand how Xtendwave can get patents when their work was >> partially funded by NIST? >> > > Just

[time-nuts] WWVB for Time Nuts

Hi: I've been reading papers by Yingsi Liang who works for Xtendwave and she seems to be the key person developing the new clocks. I've starting collecting info on my web page: http://www.prc68.com/I/Loop.shtml#PhaseMod I don't understand how Xtendwave can get patents when their work was partia

Re: [time-nuts] GPS multipath

Jim, On 08/09/2014 07:02 PM, Jim Lux wrote: On 8/9/14, 9:33 AM, Magnus Danielson wrote: Jim, On 08/09/2014 05:31 PM, Jim Lux wrote: Clarifying my previous question.. There's no doubt that multipath exists, and how to test is fairly straightforward, whether with multiple antennas, cables, or w

Re: [time-nuts] GPS multipath

On 8/9/14, 9:33 AM, Magnus Danielson wrote: Jim, On 08/09/2014 05:31 PM, Jim Lux wrote: Clarifying my previous question.. There's no doubt that multipath exists, and how to test is fairly straightforward, whether with multiple antennas, cables, or waving cookie sheets around.. Ultimately,

Re: [time-nuts] GPS multipath

Don't forget that the polarity of the reflection will reverse. RCP > LCP. and a >20 dB loss will occur. Tom - Original Message - From: "Jim Lux" To: "Discussion of precise time and frequency measurement" Sent: Saturday, August 09, 2014 11:31 AM Subject: [time-nuts] GPS multipath

Re: [time-nuts] GPS multipath

Jim, On 08/09/2014 05:31 PM, Jim Lux wrote: Clarifying my previous question.. There's no doubt that multipath exists, and how to test is fairly straightforward, whether with multiple antennas, cables, or waving cookie sheets around.. What I was really asking is if anyone had observed this in th

Re: [time-nuts] multipath on GPS

My experience with radar tells me it depends a lot on the geometry. For example a perfectly flat mirror-like reflector would only give trouble for an instant when the angle was "correct" It would give very bright reflection but then the satellite would move and then it would give no reflection.

[time-nuts] GPS multipath

Clarifying my previous question.. There's no doubt that multipath exists, and how to test is fairly straightforward, whether with multiple antennas, cables, or waving cookie sheets around.. What I was really asking is if anyone had observed this in the output of their GPS receiver. That is,

Re: [time-nuts] multipath on GPS

Hi …. back to “that depends”…. When you have a sat at just the right point *and* you are tracking that sat *and* it’s a significant part of your solution - you get a multi path issue. Then the question becomes how good your particular receiver is at rejecting multi path. You can indeed do a

Re: [time-nuts] multipath on GPS

On Fri, Aug 8, 2014 at 2:52 PM, Azelio Boriani wrote: > What about using cables to simulate the reflector? Connecting the > antenna to the receiver using a splitter, two very different length > cables and then a combiner at the receiver's input. That is a very unrealistic test. True reflections

Re: [time-nuts] WWVB BPSK patent status

If you run it through Google Translate it comes out in English but without the illustrations. Mike Harpe On Fri, Aug 8, 2014 at 10:03 PM, Alexander Pummer wrote: > > also there is one FPGA based system already available unfortunately the > description is in German : http://www.cadt.de/dieter/d

Re: [time-nuts] multipath on GPS

To take out the reflection angle variation between satellite and reflector, I think that using cables can help, so that it is possible to experiment with the multipath sensitivity of the receiver. The experiment then can continue using a real reflector. The satellites' position is known and maybe t

Re: [time-nuts] multipath on GPS

Jim, On 08/08/2014 09:39 PM, Jim Lux wrote: Does anyone have a feel for what the minimum size reflector at some small distance would be detectable on a GPS timing receiver? WOuld you be able to see a change of a 1 meter square reflector 10 meters away? It depends. Your question is radio-orient