TACAN

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TACAN

Postby Boldpilot » Fri Nov 21, 2008 7:47 am

Is there any way I can set a Tacan frequency in FS9.BP
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Postby rd » Fri Nov 21, 2008 8:13 am

http://en.wikipedia.org/wiki/Tactical_Air_Navigation

I have to say, until your post, I've never heard of it. More than likely, neither has anybody else.

As for an answer, I can't really give you one. Sorry. :(

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Tacan

Postby Boldpilot » Sun Nov 23, 2008 12:23 am

Hi, If you fly to military airfields you would see that they don't have VOR/DME stations but they have Tacan .I have been told to convert the Tacan ID to civilian VOR/DME you take the Tacan ID [such as 020X]
And for all ID's 1 t0 17 you would add 134.3
17 to 59 + 106.3
60 to 69 + 127.3
70 to 126 + 105.3

For airfields with a Y designator [020Y]
this would then be 17 to 59 +106.35
70 to 126 + 105.35

Feedback would be appreciated. Boldpilot
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Postby rd » Sun Nov 23, 2008 7:07 am

Wow, you really know how to bring up something out of the blue, and something that, is technically correct.

Give me some time tonight, and I'll see if it is possible or not. I want to say no, but I've been wrong before.

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Tacan

Postby Boldpilot » Sun Nov 23, 2008 7:54 am

Thanks RD ,Still making the brain work,aye!!.BP
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Postby rd » Sun Nov 23, 2008 8:01 am

Heck, it's either you or Harky baby, that keeps me on my toes. LOL.

RD

EDIT: I found some files over at AVSIM concerning the TACAN. Not sure exactly if they are what your looking for or not. Just go there, and click on the "Extended Search" box, and type in "TACAN". It will bring up some pages and info on each.

But I'll keep looking for ya.
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Postby rd » Sun Nov 23, 2008 8:17 am

http://www.flightgear.org/version.html

You might, or may not be interested in this.

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TACAN

Postby prune » Sat Dec 27, 2008 2:00 am

Hello Chaps

I took a look at WiKipedia and they explained it this way

TACtical Air Navigation, or TACAN, is a navigation system used by military aircraft. It provides the user with a distance and bearing from a ground station. It is a more accurate version of the VHF omnidirectional range / Distance Measuring Equipment (VOR/DME) system that provides range and bearing information for civil aviation. At VORTAC facilities, the DME portion of the TACAN system is available for civil use.

TACAN in general can be described as the military version of the VOR/DME system. It operates in the frequency band 960-1215 MHz. The bearing unit of TACAN is more accurate than a standard VOR since it makes use of a two frequency principle, with 15 Hz and 135 Hz components.

The distance measurement component of TACAN operates with the same specifications as do civil DMEs. Therefore to reduce the number of required stations, TACAN stations are frequently co-located with VOR facilities. These co-located stations are known as VORTACs. This is a station composed of a VOR for civil bearing information and a TACAN for military bearing information and military/civil distance measuring information. The TACAN transponder performs the function of a DME without the need for a separate, collocated DME. Because the rotation of the antenna creates a large portion of the azimuth signal, if the antenna fails, the azimuth component is no longer available and the TACAN downgrades to a DME only mode.

Theoretically a TACAN should provide a ninefold increase in accuracy compared to a VOR but operational use has shown only a 1.5 to 2 fold increase
Accuracy of the 135 Hz azimuth component is ±1° or ±63 m at 3.47 km.[1] Accuracy of the DME portion is 185 m (±0.1 nautical mile).[1]

Because the azimuth and range units are combined in one system it provides for simpler installation. Less space is required than a VOR because a VOR requires a large counterpoise and a fairly complex phased antenna system. A TACAN system theoretically might be placed on a building, a large truck, an airplane, or a ship, and be operational in a short period of time. TACAN, for example, are used on air refueling tankers.

For military usage a primary drawback is lack of the ability to control emissions (EMCON) and stealth. Naval TACAN operations are designed so an aircraft can find the ship and land. There is no encryption involved, an enemy can simply use the range and bearing provided to attack a ship equipped with a TACAN. Some TACANs have the ability to employ a "Demand Only" mode wherein they will only transmit when interrogated by an aircraft on-channel. It is likely that TACAN will be replaced with a differential GPS system similar to the Local Area Augmentation System called JPALS. The Joint Precision Approach and Landing System has a low probability of intercept to prevent enemy detection and an aircraft carrier version can be used for autoland operations.

Some systems used in the United States modulate the transmitted signal by using a 900 RPM rotating antenna. Since this antenna is fairly large and must rotate 24 hours a day, it can cause reliability issues. Modern systems have antennas that use electronic rotation (instead of mechanical rotation) and have no moving parts.

Of course this is not the whole story well it never is, is it, what it used to do when I worked for ATC in the 1970's uless my memory is playing tricks on me, was it plotted a trace on a circular display giving the compass bearing and range of aircraft when they made a call.
Hope you havr all had a merry ol' Christmas

W/Cmdr Percival Prune (hic!)
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Tacan

Postby Boldpilot » Sat Dec 27, 2008 3:05 am

Very informative Mr Prune,Thanks. For FS9 and maybe FSX I have found the way to use tacan converted to VOR for Flight Sim purposes .My previous method copied from an article didn't work.This one does .
Take tacan number ,say 021x which is in the 17-59 group, this has a frequency of 106.3 + 02.1 [note the decimal point in the tacan number]
equals 108.40. 108.40 is the frequency you would then set in the VOR radio in FS for DME.
Repeat X Channels :- 1 to 16 plus 134.3
17 to 59 plus 106.3
60 to 69 plus 127.3
70 to 126 plus 105.3
Y channels :-
17 to 59 plus 106.35
70 to 126 plus 105.35
Tacan frequencies alone cannot be set in a FS radio

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Postby rd » Sat Dec 27, 2008 7:45 am

I do believe that somewhere on AVSIM, I saw a radio setup that can use/read TACAN frequencies.

Just type in TACAN in the extended search box, if you haven't already done so.

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