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.
		(Left mouse button rotates CW, center mouse button (linux) rotates CCW)

		Load pushbutton - Inserts manualy selected frequency into selected
		preseted channel. 

	Center:
		Frequency indicator - indicates the frequency selected by the frequency
		selector   knobs. (in some case it doesn't reflect the frequency in use)

		Frequency selector knobs - 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 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.
		Turing the aircraft toward the bank steerg bar will correct the
		deviation. As the aircraft approaches the station, the pitch steering
		bar will move up toward the cnterline 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.
