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North American F-86E/F Sabre: Radio Compass Control Panel Reference

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IMPORTANT: All information is inteded for use with Microsoft Flight Simulator only and not for real aviation. It is also strongly recommended that read the Flight Manual and Checklist before your first flight.



RADIO COMPASS CONTROL PANEL

The Compass Control Panel is simulating the remote control unit for a Bendix AN/ARN-6 (airborne radio navigational) radio compass as common in the 1950's. It uses a loop aerial, which is rotated to derive a bearing to the source of the tuned radio signal. While signal strength (visible on the tuning meter) minimizes if loop antenna is positioned squared to the station, the maximum (peak) value is reached, with loop antenna aligned in line with the bearing to the station, allowing to read correct bearing degrees on the compass rose of a radio compass indicator.

Development of ADF automatic direction finder receivers fitted with a motor-driven system for automatically turning the loop to the correct bearing, was a big improvement compared to older systems, requiring pilot or navigator to operate the loop aerial manually by hand, and also the potential danger of being misleaded if the station is behind the aircraft was eliminated.

Automatic bearing to NDB (recommended):
a.
Set Function Selector Switch to position COMP.
b. Use Range (Band) Selector Switch to select the frequency band covering the desired station.
c. Tune in exact frequency with Frequency Tuning Knob.
If a valid signal is received, the Radio Compass Indicator and needle 2 of the ID-250 Radio Magnetic Indicator (2-needle) show the correct bearing to the station and the ADF mode of the Automatic Pilot may be used.

Using the ADF receiver for manual bearings:
a.
Set Function Selector Switch to position ANT.
b. Use Range (Band) Selector Switch to select the frequency band covering the desired station.
c. Tune in exact frequency with Frequency Tuning Knob.
d. If a radio signal is indicated on Tuning Meter, move Function Selector Switch to position LOOP.
e. Turn loop with Loop Rotation Switch in either direction until Tuning Meter needle maximizes.
With peak signal strength, read bearing degrees on Radio Compass Indicator or needle 2 of the ID-250 Radio Magnetic Indicator (2-needle).
  1. Compass Control - Function Selector Switch Use position COMP for automatic rotation of loop aerial to correct position. If a valid signal is received, the Radio Compass Indicator and needle 2 of the ID-250 Radio Magnetic Indicator (2-needle) are pointing to the station. Position ANT connects receiver to wire antenna. This position can be used for easier tuning and identifying the station on Tuning Meter (increased signal strength compared to position COMP). Note: Displayed bearing degrees may be not correct with switch set to ANT (no indication of direction in this position). With the switch set to LOOP, loop antenna must be rotated manually using the Loop Rotation Switch. Used only for manual bearings (the needle of the Tuning Meter must show peak signal strength, otherwise the indicated bearing degrees may be incorrect).
  2. Compass Control - Tuning Meter Needle displays signal strength of the station currently tuned.
  3. Compass Control - Loop Rotation Switch When doing manual bearings, the motor driving the loop antenna can be actuated in either direction by moving the switch to left or right. IMPORTANT NOTE: The Function Selector Switch must be set to LOOP, before the loop can be manually turned. For a usable bearing, the loop must be rotated to the position which is producing peak signal strength (Tuning Meter needle maximizes). The Cockpit-Quick-Infos show current bearing error in degrees, helping to find out, in which direction the loop antenna must be turned. The CW Oscillator Switch can be used for amplifying the received signal if necessary, allowing a more precise positioning of loop antenna.
  4. Compass Control - Frequency Display Indicates frequency of the station tuned in with Frequency Tuning Knob in the selected band (1-4). Clicking into the display window toggles digital readout of frequency for improved readability. Use as desired.
  5. Compass Control - Range (Band) Selector Switch Frequency range is 100-1750 KHz, covered by 4 bands:
       Band 1   100-200 KHz
       Band 2   200-410 KHz
       Band 3   410-850 KHz
       Band 4   850-1750 KHz
    Band-switching on the AN/ARN-6 is done electrically by setting the switch on the control panel to the desired position.
  6. Compass Control - Frequency Tuning Knob Tunes to a radio signal within the frequency band selected by the Range (Band) Selector Switch. Allows continuous frequency changing in 0.1 KHz steps throughout the complete range of the selected band by remote controlling an electric motor in the receiver. There are mouse spots for frequency inc-/decrementing in 0.1, 1, and 20 KHz steps (see APPENDIX 2.) Click into Frequency Display window to toggle a digital readout of the current frequency tuned. Can be used for easier frequency setting.
  7. Compass Control - Display Light Control Switch Toggles background light in the Frequency Display window to improve readability at night.
  8. Compass Control - Volume Knob Toggles the NDB ident sound (audible indication that a radio signal is received).
  9. Compass Control - CW Oscillator Switch Here, this switch amplifies the received radio signal for better indication of signal strength on Tuning Meter. Use as desired. The Function Selector Switch must be in position ANT or LOOP.
  10. Instrument Panel Lights Control Switch Turns cockpit lights on/off. In the Virtual Cockpit, this switch is located at the right cockpit wall. See Special Clickspots and Mouseover Areas.

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