[Boatanchors] LightSquared

[J. Forster]

The number of slaves per master is hard to pin down.

The Rad Lab Book and other documents imply there can be two Slaves per
Master, but I've not been able to find any specific incidences of more
than one Slave per Master.

To make matters more complex, a particular Master can belong to more than
one chain, with different GRIs.

-John

=======




>
> More on LORAN:
>
> Unless you had a LORAN-A transmitter VERY close to
> your location, it is unlikely you could tell which
> station was where.  LORAN-A stations had a "MASTER"
> and "SLAVE" relationship.  I no longer remember from
> my days as a student navigator if it was a one-to-one
> relationship or if there could be more than one slave
> per master.  The chains of stations were spread along
> the coasts in many parts of the world.
>
> Charts were drawn with parabolic curves of TDs (time
> delays or differences, IIRC) for a given master and
> slave.  A slave had its pulse delayed from that of its
> master and the lines on the charts located all the
> points where a specific time delay would exist.  These
> lines were VERY accurate for the technology of that
> time in history.  When the marine or aeronautical
> operator logged a TD from two (or more) different
> slave/master pairs, the point where those TDs crossed
> provided a definite and accurate "fix."
>
> It was important that the navigator/operator ensured
> that stations providing "direct wave" reception were
> chosen.  Signals arriving via "sky wave" would have
> delays that degraded accuracy.  Accuracy, therefore,
> was higher the closer you were to the transmitter
> chains.  Of course if you are in the middle of the
> ocean, knowing your location within a few miles is
> probably adequate.  Close to shore, accuracy could
> get down to a few yards, I believe.  Fishermen loved
> LORAN for its repeatability in finding "hot" spots!
>
> * * * * * * * * * * *
> * 73 - Mac, K2GKK/5 *
> * (Since 30 Nov 53) *
> * k2gkk at hotmail.com *
> * Oklahoma City, OK *
> * USAF & FAA (Ret.) *
> * * * * * * * * * * *
>
>
>
>> From: 1oldlens1 at ix.netcom.com
>> To: jfor at quikus.com; w3nu at roadrunner.com
>> Date: Thu, 11 Oct 2012 09:20:10 -0700
>> CC: boatanchors at mailman.qth.net; drewrailleur807 at yahoo.com
>> Subject: Re: [Boatanchors] LightSquared
>>
>>
>> ----- Original Message -----
>> From: "J. Forster" <jfor at quikus.com>
>> To: "Charles Ring" <w3nu at roadrunner.com>
>> Cc: <boatanchors at mailman.qth.net>; "Drew P."
>> <drewrailleur807 at yahoo.com>
>> Sent: Thursday, October 11, 2012 7:31 AM
>> Subject: Re: [Boatanchors] LightSquared
>>
>>
>> > There is not much to hear on either LORAN-A or LORAN-C.
>> >
>> > At any fixed location, the signals will not vary in time.
>> >
>> > LORAN-A is just a short RF pulse, followed a fixed time
>> > later by another
>> > identical pulse; repeat ad infinitum.
>> >
>> > -John
>>
>> I used to hear Loran-A all the time, it had what music
>> people call a phasing or flanging effect so that the pitch
>> of the pulses ran up and down cyclically. It was a great
>> signal for testing noise limiters. I could just barely hear
>> a Loran-C station on my BC-779 but I did not attempt to make
>> any sort of LW antenna. I have no idea where that station
>> was but the Loran-A station must have been in San Pedro
>> because it was consistently very strong both day and night.
>>
>>
>> --
>> Richard Knoppow
>> Los Angeles
>> WB6KBL
>> dickburk at ix.netcom.com
>
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