[time-nuts] LORAN C simulator operational

[paul swed]

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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