[ARC5] Mystery Black Box

[J. Forster]

The direct Lat-Long readout was much later, after the advent on minis and
much more commomly microd. Mid 1970s, not before. It takes a fair amount
of computing of spherial trig.

The accuracy of LORAN-A and LORAN-C were comperable. Both certainly w/in
1000' with a well-trained operator. LORAN-C with a uP could easily do
50-100 feet. LORAN-C was better adapted to automated operation.

-John

=====================


> As I said, I know next to nothing about LORAN-C.  I assume it was some
> sort of hyperbolic system but suspect there were probably some significant
> differences.  I believe the LORAN-C stations were not collocated and
> different hyperbolic charts would be required.  One difference was that
> with the advances in electronics, some "C" receivers were made to give
> direct coordinate position readouts. Fishermen LOVED LORAN-C because they
> could return to within a few feet of favorite fishing holes!
>
> * * * * * * * * * * *
> * 73 - Mac, K2GKK/5 *
> * (Since 30 Nov 53) *
> * k2gkk hotmail com *
> * Oklahoma City, OK *
> * USAF & FAA (Ret.) *
> * * * * * * * * * * *
>
>
>> From: mmab at cox.net
>> To: k2gkk at hotmail.com; jcoward5452 at aol.com; milsurplus at mailman.qth.net;
>> arc5 at mailman.qth.net
>> Date: Sat, 26 Apr 2014 17:49:17 -0700
>> Subject: Re: [ARC5] Mystery Black Box
>>
>> Other than carrier frequencies, how are LORAN A and C "different
>> animals"?.  I think both are pulse modulated hyperbolic systems.
>> Couldn't up-converted LORAN C signals be displayed on the APN-4 and used
>> for navigation with a suitable chart?
>> Mike-W6MAB>>>
>>   ----- Original Message -----
>>   From: D C _Mac_ Macdonald
>>   To: KE6PPF Jay Coward ; mmab at cox.net ; Military Surplus Mail List ;
>> ARC-5 Mail List
>>   Sent: Saturday, April 26, 2014 5:38 PM
>>   Subject: RE: [ARC5] Mystery Black Box
>>
>>
>>   As far as I know, LORAN-A and LORAN-C are totally different animals.
>>
>>   I trained on APN-9 at USAF Navigator School back in 1961-1962.  As the
>> VLF (~ 100 kHz) LORAN-C came in much later, LORAN-A went away
>> gradually and the 1.8 - 2.0 MHz 160 Meter band was returned totally to
>> amateur radio usage.  LORAN-C was so accurate that additional
>> transmitting stations were added in the central part of the USA to
>> boost navigation accuracy on the inland rivers and Great Lakes.
>> LORAN-C was discontinued as GPS and Differential GPS became available.
>>
>>   * * * * * * * * * * *
>>   * 73 - Mac, K2GKK/5 *
>>   * * * * * * * * * * *
>>
>>
>>
>>
>>   > To: mmab at cox.net; ARC5 at mailman.QTH.net; Milsurplus at mailman.QTH.net
>>   > Date: Sat, 26 Apr 2014 20:24:48 -0400
>>   > Subject: Re: [ARC5] Mystery Black Box
>>   > From: arc5 at mailman.qth.net
>>   >
>>   >
>>   > The RF connectors may provide a clue. They have a bail retainer and
>> that seems to be to be used on UK gear.(?)
>>   > Smarter people speak up!
>>   > Jay
>
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