[ARC5] Mystery Black Box

[D C _Mac_ Macdonald]

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!
  
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* 73 - Mac, K2GKK/5 * 
* (Since 30 Nov 53) * 
* k2gkk hotmail com * 
* Oklahoma City, OK * 
* USAF & FAA (Ret.) * 
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> 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. 
>    
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>   * 73 - Mac, K2GKK/5 * 
>   * * * * * * * * * * * 
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> 
>   > 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