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PHI - Position and Homing Indicator: Difference between revisions
PHI - Position and Homing Indicator (view source)
Revision as of 20:12, 24 November 2020
, 24 November 2020→Flight planning
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To load the data into the PHI table (in fact it is as if you were programming the "Selector Unit Programmer" ('''NCU''') portable cassette, just click on the [Activate] button of the '''RM'''. you go now on the menu [''Fiat G91''] followed by [''PHI - route system''] opens a window showing various parameters among which we highlight 5 columns that correspond to the 5 'buttons '''NCU''', these columns have been filled in by the distance to cover, the direction and finally the altitude of the flight obtained by the Route Manager (if the altitude is zero in the '''RM''' this is set to 15,000 ft). | To load the data into the PHI table (in fact it is as if you were programming the "Selector Unit Programmer" ('''NCU''') portable cassette, just click on the [Activate] button of the '''RM'''. you go now on the menu [''Fiat G91''] followed by [''PHI - route system''] opens a window showing various parameters among which we highlight 5 columns that correspond to the 5 'buttons '''NCU''', these columns have been filled in by the distance to cover, the direction and finally the altitude of the flight obtained by the Route Manager (if the altitude is zero in the '''RM''' this is set to 15,000 ft). | ||
The PHI programming framework also contains other parameters among which we have the convergence <ref>The ''convergence'' is a necessary parameter for calculating rhumb line air routes and is calculated as the average of the latitude of the departure airport and of the arrival airport. The PHI allowed the programming of the convergence through a special panel, in case it was used in civil aviation or on military transport air vehicles, or through a regulator placed in the ``Signal amplifier and Junction-Box'' regulated by a specialized technician, in what required the opening of a special external door.</ref> | |||
Below we have a section that defines the way we want to generate the route: | |||
* ''Loop'': it is a demonstrative or useful programming to make a waiting circuit, the two courses allow you to define the length of the two sides, the direction of rotation which can be right or left and the "To repeat" parameter sets to the PHI to start over when a loop has been completed. | |||
* ''Manual'': the table is inserted manually. | |||
* ''Route manager'': the data has been loaded from '''RM'''. | |||
In reality the 5 columns corresponded to the programming of only 4 columns, the first was set manually by the pilot. | |||
The [Auto push] button allows to obtain the automatic progression of the route, in reality it was manual, obviously you can decide the progression manually.<br> The next block is the insertion of the magnetic declination, also in this case it is automatic, at least that the pilot does not want to do it himself.<br>The ''Wind configuration'' is used to automatically enter the wind direction and speed, otherwise it must be entered manually with the appropriate PHI system gauge.<br>Finally there is the section ''doppler''which defines 4 possible ways of use:<br>OFF, Rec only (keeping the doppler ''warm'', but without signal emission, useful in the enemy area)<ref>In reality, the ''heating'' time of the PHI apparatus was fairly long, it could proceed for several minutes before the thermionic valves stabilized, in the simulation this time was reduced to a few tens of seconds in order not to bore the user.</ref>, ON (Operative), Test.<br>The selector ''sea / land'' allows you to adjust a filter that improves the Doppler's operability when you have to cross a stretch of sea. | |||