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Harrison AB ATC Tower

This addon spawns an air traffic control tower at Harrison Airbase. It is equipped with both primary radar and a proprietary RX-based secondary radar. Newer vehicles in my 1:1 playlist will be compatible, but make sure to check the description first to see.

Currently Compatible:
Cessna 152 Aerobat (old), no guarantees
Beechcraft Bonanza V35
Sikorsky H-34 (S-58)
Cessna 152 Aerobat [REMASTER]

To open doors, press the small instrument panel toggle switch along the middle of the door. It is placed at the base of the window. This switch will send a pulse disconnecting the door from it's catch, allowing it to swing either from you walking into it or pushing it open with the handle if you're in multiplayer. When the door is pushed closed the latch will re-engage, even when the switch is still on. Pressing the switch again will disconnect the latch once more.

Pressing one of the arrow buttons will send the elevator to that location. If the elevator is at the top of the tower, press the button pointing down to send it to the bottom, and vice versa. It makes no sound and has no windows, so it may feel like it isn't moving, but after a few seconds it will arrive at its destination.

Best room in the tower.

If the ascent was too dark for you, you're in luck. Lights are activated by the switch on the door frame on the observation floor. There is a button that disables the raytrace spotlighting for less lag hidden under the instrument panel also in the door frame.

The switch is next to the switch for the lights. The fan will spin up to speed and provide soothing white noise. Turning the fan off will cause it to spin back down to standstill. Not perfectly physically accurate in its motion but pretty damn close.

This hatch leads to the roof. If the radar is operational, you may want to duck to prevent any signal interference for the controllers below. Try not to fall.

Sorry I couldn't keep the cool microphone stand, it was inferior.
In order to monitor multiple frequencies at once (one main and one emergency/guard), the radio uses a relay between handheld walkie-talkies and the main, 40km range RX. It may seem more complicated than it has to be, but this way you can talk out loud to others in the tower, then watch a radar screen and actively speak to the aircraft without having to press some physical button on the desk. (hand2) and (hand1) mean walkie-talkie channel 2 and walkie-talkie channel 1 respectively.

This handy gadget produced and distributed by Advanced Technology Solutions A.G., a totally real and reputable company that is definitely not at all a shell corporation, will take in weather information, do some calculation, and spit out relevant airport meteorological conditions. Press the c- (power) button on the standing PC next to the monitor to power it on. Once it's booted, press any button. Press the left or right buttons to cycle through locations, (auto) will automatically display data for the nearest concrete location. In this case that's Harrison Airbase.
The Atmos-82 ANALYX displays what the active runway should be, the head-and-crosswind components and the field elevation (QFE). Press enter to open the second page, which displays more general information including global wind in angle@speed, precipitation (they didn't catch the typo back in '82) and the equivalent visibility range. All units switch between metric and imperial every 2 seconds. Any time a value changes, the display will buffer and flash.
Hold the c- (power) button to shut the Atmos-82 ANALYX down.

Turn the suspiciously lonely key on the desk to activate the main radar antenna, which is vital for both radars' operation.

Once the antenna is active, flip the Equipment Power and Primary Display switches to begin drawing the map on the screen. The indicator light will flash every time a trace is returned, and the keypad will scale the map in kilometers. If you press on a trace on the monitor, the smaller monitor next to the keypad will display the trace's altitude in meters and in feet below it. Due to the inaccuracy of the radar components, meters are rounded to the nearest 50 and feet are rounded to the nearest 100.

Flip the Monitor Power switch to power the monitor, flip the other switch to change the zoom scale unit to nautical miles instead of kilometers. If you want to zoom in on a certain location off center from the tower's location, input the location's coordinates into the 2 input keypad. This will recenter the map on that point.

The 4 digit number next to the radar trace shows the transponder's squawk code. This is used to differentiate multiple aircraft. The other number is the trace's flight level, a.k.a. altitude in feet x100. The C donates the mode of the transponder. This means the transponder transmits both squawk code and altitude. If the transponder only transmits squawk code, it will show A instead. If the transponder's squawk code is set to one of the world's standard VFR squawk codes, the screen will show VFR instead of the code and the trace will light up yellow. If the transponder is set to one of the world's standard emergency squawk codes, the trace will light up red.

When the aircraft detects a radar signal with the radar detector block, if the transponder is active a single tick pulse will be sent to a radio tuned to 1090MHz (channel 1,090,000,000), causing it to transmit for that single pulse. Squawk code is sent through composite channel 1 and altitude is sent through channel 2.

The secondary radar has a cache of data continuously logged and replaced, which allows it to look back in time at past signals from a certain tick. Once a piece of data in the cache is older than 5 ticks, it will be cleared. This includes the tick or so it might take to send the data with the RX. When a signal is detected on 1090MHz, the radar will take the signal strength from the RX and calculate 4 possible distances to the target based on the ranges of each type of RX antenna. It will then look back in the cache, compare the target distances, and log the radar data points in a separate cache with the data from the RX if the distances are within the interval to call them "the same."

If the squawk codes of two logged data points are the same, the radar will check to see if their positions are within a certain interval. If they are, they will be counted as the same point, and the older data point will be deleted.

This has its limitations, as if either RX has a charge less than 1, the signal strength won't line up with what the calculation assumes. This would mean inaccurate distances and therefore inaccurate comparisons to the cache. I can't think of a way to get around that issue, so just make sure your batteries are always fully charged.

Self explanatory. Just look through it for something you need.

i go eat lunch now

If you have any questions don't hesitate to ask

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