Systems BPM-5 and «CONSOL» 1

Systems BPM-5 and «CONSOL» 1

System "console" and the BPM-5 (USSR). To receive the signal beacons BPM-5 and "console" on aircraft no additional hardware installation required. beacon signals can be received using a medium wave receiver or a radio compass. Using the beacon signal in flight can only be performed in the presence of special on-board card with pre-deposited lines bearing on the location beacons installed.

Practical range beacons action, working on medium wave (200-400 kHz) depends on the capacity of terrestrial radio

beacon receiver sensitivity and time. The power at the antenna operating in the beacon is from 1,5 5 to kilowatts, which allows the receiver to receive signals in the daytime average sensitivity at a distance of up to 1500 km. At night, beacons range of action increases due to the effect of radio waves reflected from the upper layers of the atmosphere, with the maximum signal range reaches 2500 km. In these cases, the direction finding accuracy is reduced.

Lighthouses radiate baseband signals in the form of a specific combination of dots and dashes. For reference the true bearing of the aircraft necessary for the DF cycle (1 minutes) to count the number of dots and dashes, listens in a particular sector, and the number of signals on the map to find the line

position of the aircraft. Diagram of beacons BPM-5 and "Console" system.

The beacons "console" the system is set the same or a reduced duty cycle during 40 seconds.

In the latter case the radiation is omnidirectional and no decrease somewhat pause. DF mode in all lighthouses set to 30 seconds. Lighthouses "console" the system are identified by two or three letters of the Latin alphabet. When working in a non-directional beacon light mode ( "long" dashes) can be measured by conventional CSD airborne radio compass.


Determination of bearing beacon is performed as follows.

  • 1. On special radio navigation charts such beacons are outlined, which are listened to during the flight only in the sectors of reliable bearings.

  • 2. Set up the receiver, identify the beacon callsigns and the initial signals of the DF mode (dots or dashes emitted to the area of ​​the beam).

  • 3. The sector within which the aircraft is located at a given time period is determined by the countable position or the approximate radio bearing of the IRS (the permissible error in determining the bearing is ± 1.

  • 4. Check that the initial DF signals (dots or dashes, heard up to the equal signal zone) correspond to the signals indicating the identified sector on the map.

  • 5. During the direction finding mode, listen for the number of dots or dashes of the equisignal zone (ie, until the signal disappears) and after the equisignal zone. The total number of dots and dashes in each work cycle must be 60.

  • 6. At the time of listening to the equal-signal zone, the bearing time is recorded.

  • 7. If a certain number of characters are lost in the cycle, the number of lost signals is added separately to both the counted number of dots and the counted number of dashes.

  • 8. The laying of the radio bearing on the map is carried out according to the number of corrected signals (dots or dashes), listened to up to the equal-signal zone, by linear interpolation between multiple radio bearing lines shown on the map. For the example shown, the bearing line corresponds to 21 dashes and should be drawn in the dash sector between the lines.

Bearing the airplane can be determined by measuring the stopwatch separate periods DF mode beacon.

Using this method, you can specify the plane bearing without listening to all the DF mode, as the number of lost signal is determined by the listening time of the beam.


The procedure for measuring the following:

  • 1) turn on the stopwatch at the start of the direction finding mode;

  • 2) at the moment of signal disappearance, note the time in seconds;

  • 3) stop the stopwatch when listening to other signals;

  • 4) using the time readings to find, and from them - the number of radio beacon signals to the equal-signal zone.


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