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README.nav-system
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TACAN AN/ARN-118
----------------
FIXME
ILS
---
FIXME
VHF AM/FM Transceiver: Collins AN/ARC-186(V)
--------------------------------------------
The Fairchild A-10 has two of them. Both remote control panels are mounted
on the left console. Each radio is identical but they are preseted
single-band to provide dedicated VHF/AM or VHF/FM operation. This is done by
an external switch located on the receiver-transceiver unit.
The forward one is tuned to operate in VHF/AM mode (RL):
normal range
116 to 151.975 MHz AM
receive only range
108 to 115.975 MHz AM
The aft one should be tuned to operate in VHF/FM mode for homing capability
at 30 to 76 MHz FM but is currently disabled in the model.
For conveniance purposes, I decided to let the forward one work in the both
ranges for homing mode (which in RL should be reserved to FM).
The homing is displayed on the ADI (Attitude Indicator). There is no Course
setting and no Radials caculation when using AM/FM homing on the ADI.
Controls and indicators:
------------------------
Left side:
VOL control knob - not yet used
Squelch disable/tone switch - not used yet
Frequency control/emrgency select knob:
- EMER FM - not used yet (cyphered coms)
- EMER AM - not used yet (cyphered coms)
- MAN - Enables manual frequency selection.
- PRE - Enables preset chanel selection.
Load pushbutton - Inserts manualy selected frequency into selected
preseted channel.
Center:
Frequency indicator - displays the frequency selected by the frequency
selector knobs. (in some case it doesn't reflect the frequency in use)
Frequency selector buttons - select frequency.
(Left mouse button rotates CW, center mouse button (linux) rotates CCW)
Preset chanel indicator - indicates the preset number (1-20)
Preset chanel selector - selects the presets channels.
(Left mouse button forward, center mouse button (linux) backward)
Right:
Mode selector knob:
- OFF - Disables the receiver-transceiver.
- TR - Enable the tramsmit/receive mode.
- DF - Enable FM Homing (VHF/FM radio only).
Operation:
----------
Manual frequency selection:
- Mode selector knob - TR
- Frequency control/emergency select knob - MAN
- Frequency selector knobs - set desired frequency.
Loading preset channels:
- Mode selector knob - TR
- Frequency control/emergency select knob - MAN
- Frequency selector knobs - set desired frequency
- Preset chanel selector - click until the desired channel number is
obtained. (If the button doesn't move, review the step before).
Preset channel selection:
- Mode selector knob - TR
- Frequency control/emergency select knob - PRE
- Frequency selector knobs - click until desired channel number is
obtained. (It works also with Frequency control/emergency select
knob - MAN, but loading isn't possible in PRE mode).
FM (and AM) Homing:
- Navigation Mode Panel - TISL mode - UNSELECTED (not implemented yet)
- Navigation Mode Panel - FM button - PUSHED
- Mode selector knob - DF
- Frequency control/emergency select knob - MAN or PRE
When the signal is strong enough (in range) the course warning flag is
stowed away. then the bank steering bar of the ADI will indicate course
deviation to the left or right of the center line, relative to the
selected station.
Turning the aircraft toward the bank steering bar will correct the
deviation. As the aircraft approaches the station, the pitch steering
bar will move up toward the centerline in accordance with the increasing
strengh of the received signal. If the station is in the opposite
direction (aircraft flying away from station), the pitch steering bar
will move down from the center bar to the bottom of the ADI.
When not in the DF mode, the ADI bank and pitch steering bars and course
warning flag are stowed out of view.