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PHI - Position and Homing Indicator: Difference between revisions
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PHI - Position and Homing Indicator (view source)
Revision as of 21:07, 23 November 2020
, 23 November 2020→Technique
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With this speed difference technique, it was possible to establish the speed with high accuracy. The accuracy, however, decreased in the case of mountainous terrain or in turns. Therefore it was necessary to have two groups of beams to average the values and thus obtain a less error-prone result. | With this speed difference technique, it was possible to establish the speed with high accuracy. The accuracy, however, decreased in the case of mountainous terrain or in turns. Therefore it was necessary to have two groups of beams to average the values and thus obtain a less error-prone result. | ||
[[File:AD0091920 PHI MK2 - Principle of operation.jpeg|thumb|PHI mod MK2 - Principle of operation from confidential doc AD091920<ref name="AD091920" | [[File:AD0091920 PHI MK2 - Principle of operation.jpeg|thumb|PHI mod MK2 - Principle of operation from confidential doc AD091920<ref name="AD091920">'''The canadian position and homing indicator mk.2''' doc: [https://apps.dtic.mil/dtic/tr/fulltext/u2/091920.pdf AD091920]<br>''CLASSIFICATION CHANGES. TO: unclassified. FROM: confidential. Approved for public release, distribution unlimited. Aut. RL JEFFERIES · 1955''</ref> (1955)]] | ||
It is important to remember that the technique was possible with the constant improvement of the quality of radars and their simultaneous miniaturization due to the rapid development of this device during and after the Second World War. The PHI model used in the FIAT G91 and in the F104s from the A-B to G series and in various civil aircraft including the DC8, was mechanical (ball integrator) and with tube electronics, no transistors were still used. | It is important to remember that the technique was possible with the constant improvement of the quality of radars and their simultaneous miniaturization due to the rapid development of this device during and after the Second World War. The PHI model used in the FIAT G91 and in the F104s from the A-B to G series and in various civil aircraft including the DC8, was mechanical (ball integrator) and with tube electronics, no transistors were still used. | ||
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The apparatus required a lot of power, about 150W, partly with 28V voltage and partly with 400 Hz alternating at 115V needed to drive the various synchronous motors and related actuators. | The apparatus required a lot of power, about 150W, partly with 28V voltage and partly with 400 Hz alternating at 115V needed to drive the various synchronous motors and related actuators. | ||
The main documentation found on the net that technically describes the operation of the device is that of the PDF file: AD091920 aut. RL JEFFERIES year 1955 <ref name = "AD091920"/>. | |||
This device performance evaluation document gives a clear idea of how it was designed and the parts that make it up. Its reading is really useful and has allowed us to create a sufficiently real model for an instrument that has not been operational for at least 20 years. | |||
===Parts constituting the apparatus=== | ===Parts constituting the apparatus=== | ||