[time-nuts] Loran

[Mark Kahrs]

Very interesting topic.  So, it appears that UrsaNav bought a pair of
companies that have interesting IP.  In particular, CrossRate has a few
interesting patents -- this may be the most relevant:

United States Patent Application 20080144744:

 A system for demodulation of the Loran Data Channel transmitted over the
Enhanced Loran (eLoran) system including a quadrature filter. The
quadrature filter calculates the real and quadrature phase components of a
received ninth pulse. The resultant components are used to obtain the angle
of the ninth pulse. This angle is then compared with a set of pre-tabulated
angles/symbols that are calculated using the same quadrature filter on
thirty-two different simulated ninth pulses. The closest angle match gives
the corresponding symbol. Such twenty-four symbols make up a single Reed
Solomon encoded message. This message is then passed through a Reed Solomon
decoder and the transmitted message is obtained.

Also, UrsaNav teamed with Nautel, noted LF amplifier designer for this
system.  Interesting.



On Sat, Dec 1, 2012 at 10:42 AM, Chuck Harris <cfharris at erols.com> wrote:

> Remove the "that" from "pdfthat" ?
>
>
> paul swed wrote:
>
>> Not sure why the link does not work but the docs under the whitepapers.
>>
>> On Fri, Nov 30, 2012 at 9:17 PM, Alan Hochhalter <alanh137 at gmail.com>
>> wrote:
>>
>>  There is some info here http://www.ursanav.com/ - click on the Latest LF
>>> News on the right side.
>>>
>>> There is a paper here
>>>
>>> http://www.nautelnav.com/wp-**content/uploads/2011/09/**
>>> Nautel-UrsaNav-NAV10-Research-**Paper.pdfthat<http://www.nautelnav.com/wp-content/uploads/2011/09/Nautel-UrsaNav-NAV10-Research-Paper.pdfthat>
>>> I think is relevant.  It will take me some time to wade through it
>>> with no guarantee I'll understand it enough to be sure it is talking
>>> about
>>> the same thing so I thought I'd pass it along.
>>>
>>> Alan
>>>
>>> On Fri, Nov 30, 2012 at 6:46 PM, paul swed <paulswedb at gmail.com> wrote:
>>>
>>>  Well as predicted they went home at 5pm. Signals off the air.
>>>>
>>>> On Fri, Nov 30, 2012 at 7:26 PM, Bill Riches <bill.riches at verizon.net
>>>>
>>>>> wrote:
>>>>>
>>>>
>>>>  Nothing going on in Cape May for a while - I don't know if they are
>>>>>
>>>> done
>>>
>>>> testing.
>>>>>
>>>>> Bill WA2DVU
>>>>> Cape May, NJ
>>>>>
>>>>> -----Original Message-----
>>>>> From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces@**febo.com<time-nuts-bounces at febo.com>
>>>>> ]
>>>>>
>>>> On
>>>
>>>> Behalf Of Mike Garvey
>>>>> Sent: Friday, November 30, 2012 3:25 PM
>>>>> To: 'Discussion of precise time and frequency measurement'
>>>>> Subject: Re: [time-nuts] Loran
>>>>>
>>>>>
>>>>> Might be these guys; this abstract is from the Precision Time and Time
>>>>> Interval (PTTI) Meeting which took place in Reston, VA during this past
>>>>> week.
>>>>>
>>>>> There will be a follow-up manuscript.
>>>>>
>>>>> Mike
>>>>>
>>>>> -----Original Message-----
>>>>> From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces@**febo.com<time-nuts-bounces at febo.com>
>>>>> ]
>>>>>
>>>> On
>>>
>>>> Behalf Of paul swed
>>>>> Sent: Thursday, November 29, 2012 6:35 PM
>>>>> To: Discussion of precise time and frequency measurement
>>>>> Subject: Re: [time-nuts] Loran
>>>>>
>>>>> Rich
>>>>> Did not see anyone respond. Are you still hearing the signal?
>>>>> Paul
>>>>> WB8TSL
>>>>>
>>>>> On Mon, Nov 26, 2012 at 6:59 PM, Rich and Marcia Putz <rputz at bnin.net
>>>>>
>>>>>> wrote:
>>>>>>
>>>>>
>>>>>  Hi all;
>>>>>>
>>>>>> I 'm hearing Loran C signals here in northern Indiana this evening, I
>>>>>> guessing from New Jersey. Anyone else hearing these?
>>>>>>
>>>>>> Rich
>>>>>>
>>>>>> ______________________________****_________________
>>>>>> time-nuts mailing list -- time-nuts at febo.com To unsubscribe, go to
>>>>>> https://www.febo.com/cgi-bin/**** <https://www.febo.com/cgi-bin/**>
>>>>>> mailman/listinfo/time-nuts<
>>>>>>
>>>>> https://www.febo.com/cgi-bin/**mailman/listin<https://www.febo.com/cgi-bin/mailman/listin>
>>>
>>>> fo/time-nuts>
>>>>>> and follow the instructions there.
>>>>>>
>>>>>>  ______________________________**_________________
>>>>> time-nuts mailing list -- time-nuts at febo.com To unsubscribe, go to
>>>>> https://www.febo.com/cgi-bin/**mailman/listinfo/time-nuts<https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts>
>>>>> and follow the instructions there.
>>>>>
>>>>>
>>>>>
>>>>> ______________________________**_________________
>>>>> time-nuts mailing list -- time-nuts at febo.com
>>>>> To unsubscribe, go to
>>>>> https://www.febo.com/cgi-bin/**mailman/listinfo/time-nuts<https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts>
>>>>> and follow the instructions there.
>>>>>
>>>>>  ______________________________**_________________
>>>> time-nuts mailing list -- time-nuts at febo.com
>>>> To unsubscribe, go to
>>>> https://www.febo.com/cgi-bin/**mailman/listinfo/time-nuts<https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts>
>>>> and follow the instructions there.
>>>>
>>>>  ______________________________**_________________
>>> time-nuts mailing list -- time-nuts at febo.com
>>> To unsubscribe, go to
>>> https://www.febo.com/cgi-bin/**mailman/listinfo/time-nuts<https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts>
>>> and follow the instructions there.
>>>
>>>  ______________________________**_________________
>> time-nuts mailing list -- time-nuts at febo.com
>> To unsubscribe, go to https://www.febo.com/cgi-bin/**
>> mailman/listinfo/time-nuts<https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts>
>> and follow the instructions there.
>>
>>
> ______________________________**_________________
> time-nuts mailing list -- time-nuts at febo.com
> To unsubscribe, go to https://www.febo.com/cgi-bin/**
> mailman/listinfo/time-nuts<https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts>
> and follow the instructions there.
>