John, On 08/01/11 16:08, J. Forster wrote:
Pondering some more on this, doing some calculations (spread-sheets) the actual scheme emerge... the range of 0 to 7 is not selected by accident.
I had essentially the same spread sheet...However, how would you be able to achieve simplicity of design by being true to the PRI/PRR given or to what seems like reasonable counter based solution. Notice that the ARN-4 has a "Crystal phasing" control to adjust the crystal frequency of the receiver so that the receiver will align up to the actual rate of the master station.
I think the PRI/PRR given is a presentation simplification rather than true numbers. Considering that absolute frequency was not a requirement, the repetition rate of the master needs to be sufficiently stable for distinction of station and the receiver to make stable reading, in presence of other stations.
That LORAN-C uses GRI indications with repetition rate in microseconds, and fairly even such numbers as well, is another hint.
Thus, I view the PRI/PRR ratios as approximations at best, a matter of presentation rather than actual nominal rates.
Cheers, Magnus
lorana.xls
Description: MS-Excel spreadsheet
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