[time-nuts] LORAN C simulator operational

[Brooke Clarke]

Hi Paul:

The 2042 will give you an idea of what features you might want to 
include, that's why I added larger photos.  In addition the European 
Loran chains have GRI values that are is smaller steps than the US 
chains.  I'd like to know more about your simulator.

Have Fun,

Brooke Clarke
http://www.PRC68.com


paul swed wrote:
> Brook no info on it. What I worked on is a solution for those of us that
> have austrons and no simulators to feed them.
> I suspect they might be hard to come by.
> Regard
>
> On Tue, Dec 8, 2009 at 3:48 PM, Brooke Clarke<brooke at pacific.net>  wrote:
>
>    
>> Hi Paul:
>>
>> Austron made a simulator, see:
>> http://www.prc68.com/I/A2042.shtml
>> Click on photos to see larger images.
>> If anyone has any documentation on this unit please let me know.
>>
>> Have Fun,
>>
>> Brooke Clarke
>> http://www.PRC68.com
>>
>>
>> paul swed wrote:
>>
>>      
>>> A few weeks back I started a discussion on the demise of LORAN C. It was
>>> quite a long discussion and spawned several others.
>>> I will indeed miss LORAN C as a frequency reference for several reasons.
>>> It
>>> was very good more stable then wwvb on the east coast.
>>> And for 10 years I have had 3 austron 2100 and 2100f frequency monitors.
>>> I used LORAN C to set my RB standards. Granted I also have GPS using the
>>> hp
>>> 3801.
>>> So with the shutdown in Jan I hated junking the Austrons they are nice
>>> comparators.
>>> Recently, 2 days ago I set out to see if a LORAN C simulator could be
>>> created that was simple, effective, and inexpensive. Using very common
>>> parts
>>> and minimum of wiring.
>>> It would appear that it can be done.
>>>
>>> What I am using is 5 cmos chips CD 4000 series gates and counters and a
>>> parallax SXb micro programmed in basic.
>>> These have allowed me to emulate the master stations and the GRIs along
>>> with
>>> the phase reversals needed to identify a master.
>>> Using 2 RB standards a HP5065a as the master to the simulator and a cel
>>> tower RB pull and both had been set to LORAN C and checked with GPS the
>>> austrons tracking the simulated  LORAN signal in 1-7 E-12th range as
>>> expected.
>>>
>>> This is very fresh data as this has been running about 5 hours now and
>>> there
>>> could be issues.
>>> More time is needed to cleanup the software about 100 lines of easy code
>>> thats simple and consistent in operation. (Read this as not tricky and
>>> really boring)
>>> Other comments the waveform is simple no attempt has been made to actually
>>> create the wave shape. (Part of the KISS principle)
>>> I really wanted to see what I could get away with. Still do wonder if I
>>> need
>>> the phase reversals.
>>>
>>> Now if there is interest I will need to figure out how to share the
>>> details
>>> and code.
>>> Will be on a business trip for the next few days so may not see a reply.
>>> Regards
>>> Paul
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>>>        
>>
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