[time-nuts] LORAN C simulator operational

Brooke Clarke brooke at pacific.net
Sat Dec 12 22:31:22 UTC 2009


Hi Paul:

Glad to hear it's working!

Free schematic software at:
http://www.expresspcb.com/
They also have PCB layout that's tied to the schematic and very 
reasonable prices for making boards.
No interest in the company other than being a happy user.

Have Fun,

Brooke Clarke
http://www.PRC68.com


paul swed wrote:
> Back from a trip and have had a chance to clean up the software for the
> LORAN C simulator.
> So do people generally just attach that to this thread. Say a schematic and
> basic program. Then thats it???
> The simulators very stable and at this point the Austron 2100F goes from
> acquire to track in about 2 minutes.
> With the first readout at 1.1 e-11 between the two references that I am
> using. I am using a gri of 60000 though others can be used. Signal level 48
> which is quite strong.
> By the way schematic wise I suspect final output a gif. Any particular free
> schematic software people use.
> I am comfortable with visio so may just use that.
> Reagrds
>
> On Tue, Dec 8, 2009 at 2:48 PM, paul swed<paulswedb at gmail.com>  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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