[time-nuts] eLORAN will be on the air GRI 99600

Thu Aug 6 23:37:43 UTC 2020

Hi

The problem with CDMA timing is that not all network operators sync their 
systems to GPS in all areas. That results in some really strange timing issue
when using one of the CDMA based devices. More or less, Symmetericom
got a *lot* of devices into the field before they found that out …..

Bob

> On Aug 6, 2020, at 5:22 PM, Bill Notfaded <notfaded1 at gmail.com> wrote:
> 
> Isn't there also CDMA?  We used a EndRun Technologies system not long ago
> that used a small short antenna that could be located inside and didn't
> need a cable to the roof for a GPS antenna.  This was handy for rooms that
> couldn't have anything penetrate the walls at all.  It was a good reference
> and ntp server we used for years that only used time reference from CDMA
> satellites.
> 
> Bill
> 
> On Thu, Aug 6, 2020, 1:43 PM jimlux <jimlux at earthlink.net> wrote:
> 
>> On 8/6/20 9:17 AM, Taka Kamiya via time-nuts wrote:
>>> Someone in this thread mentioned "at least 2 satellite time and
>> frequency solutions" exists already.  I only know of GPS (GNSS)
>> constellations.  What's the other?
>> 
>> Transit?
>> 
>> I don't believe they are still operational, though.
>> 
>> 
>> I wonder if one might be able to pick up time/frequency from a
>> commercial TV broadcast transponder.  The transponders on the satellite
>> are typically bent pipes (for C-band anyway), I would assume that the
>> uplinks may or may not have stability comparable to terrestrial broadcast.
>> 
>> One problem is, of course, that the satellites aren't in a stable
>> location (at least on a "meters" scale) - but one could certainly do
>> "common view" kinds of time transfer.
>> 
>> 
>> 
>> 
>>> 
>>> ---------------------------------------
>>> (Mr.) Taka Kamiya
>>> KB4EMF / ex JF2DKG
>>> 
>>> 
>>>     On Thursday, August 6, 2020, 12:01:27 PM EDT, paul swed <
>> paulswedb at gmail.com> wrote:
>>> 
>>>  Magnus
>>> Its honestly by luck that I know anything. From the bits I have read
>> Europe
>>> seems far closer to eLORAN then we are. Perhaps 6 months ago the US
>>> performed a series of tests 2 eLoran solutions and something like 6 or
>> more
>>> satellite solutions. I know the old Iridium satellites were in the tests
>>> and some other LEO satellites.
>>> But thats about it.
>>> What we need is a cheap SDR LORAN C sniffer. Low power runs 24 X 7 and
>>> turns a LED on if the stations active.
>>> Oh well another project in the someday pile.
>>> Regards
>>> Paul
>>> WB8TSL
>>> 
>>> On Thu, Aug 6, 2020 at 2:42 AM Magnus Danielson <magnus at rubidium.se>
>> wrote:
>>> 
>>>> Hi Paul,
>>>> 
>>>> I only ask as you seem to track this thing the best here on time-nuts,
>>>> as far as I have seen, such that it is your emails that keeps me best up
>>>> to date with the progress.
>>>> 
>>>> Cheers,
>>>> Magnus
>>>> 
>>>> On 2020-08-05 19:21, paul swed wrote:
>>>>> Hi Magnus been a while since have emailed.
>>>>> Its one site that was a test transmitter. Its in New Jersey, USA.
>>>>> The goal of the testing I believe is to establish the viability of an
>>>>> alternate PNT reference to GPS. Additionally the ability to communicate
>>>>> some level of message broadcast. This should be identical to proposals
>> I
>>>>> have heard of in Europe.
>>>>> But I have no direct relationship to any of this. Like you, a very
>>>>> interested observer and hope that eLORAN wins the battle.
>>>>> Unfortunately there are many alternate proposals such as using other
>>>>> satellites. Hmmm if I wanted to advance my career in the Air Force or
>>>> Space
>>>>> Force (Yes thats actually real now).
>>>>> Would I select the lowly reliable as heck eLORAN at sub $100 M/year to
>>>>> operate. Or the glorious space based proposals in $B region. Never mind
>>>>> that at least 3 countries now have demonstrated killer satellites.
>>>>> Sorry for that editorial.
>>>>> Regards
>>>>> Paul
>>>>> WB8TSL
>>>>> 
>>>>> On Wed, Aug 5, 2020 at 11:04 AM Magnus Danielson <magnus at rubidium.se>
>>>> wrote:
>>>>> 
>>>>>> Hi,
>>>>>> 
>>>>>> Do you know that they would do test with two actual transmitter sites?
>>>>>> 
>>>>>> Cheers,
>>>>>> Magnus
>>>>>> 
>>>>>> On 2020-08-05 16:00, paul swed wrote:
>>>>>>> Hello to fellow time nuts.
>>>>>>> Warm up those old Austrons. eLORAN out of New Jersey has been on the
>>>> air
>>>>>>> intermittently prior to a test run next week. Due to the storm they
>>>> have
>>>>>>> lost power and should have it back today or tomorrow.
>>>>>>> The intention will be on the air operation till the 20th. That's a
>> long
>>>>>>> run. Nice.
>>>>>>> Seems the Austron 2100s can be had for reasonable money these days
>>>> also.
>>>>>>> Enjoy.
>>>>>>> Paul
>>>>>>> WB8TSL
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