Jump to content

drPhibes

Members
  • Posts

    1057
  • Joined

  • Last visited

  • Days Won

    2

Posts posted by drPhibes

  1. 1 hour ago, jaylw314 said:

    Many airfields with an ILS have a non-precision Back Course approach based on the localizer.  It's reverse-sensing, of course, but with an HSI that's a trivial issue.

    While this used to be the case some decades ago, back course approaches are rarely used these days (at least outside the US). Modern localizers use LPDA antennas with high front-to-back ratios ( > 20dB) which need modification in order to radiate a useful back course signal. Back course approaches are not approved for use in the EU (and Canada), and are extremely rare in the rest of the open ILS market (i.e. everywhere except the US and Russia, which have local monopolies).

  2. 1 hour ago, FalcoGer said:

    Even so if the information on wikipedia is to be believed the missile does mach 1.3. Even at max range the missile reaches the target in 1 second.

    How did you come up with that number? If the data on wikipedia is accurate (which it probably isn't, but let's just say it is for the sake of simplicity), the maximum range of the 114L is 8000m. Mach 1,3 = 450m/s. If the missile flew at a constant velocity (which it doesn't, but these are ballpark figures), the time of flight at max range would be around 18 seconds. Then add a few seconds for the acceleration phase, and you're looking at ~20 seconds.

    • Like 4
  3. 1 hour ago, DmitriKozlowsky said:

    I don't see what I learned from a GPU fail. Learning would be for me knowing how to prevent GPU failiure in future. There is nothing I can do to prevent my next GPU from failing, as I do not know what caused this one to fail. It was not overclocked, or modified. It was never used for mining. It has good airflow. As far as I know, same thing could happen again and there little to nothing I can do to prevent it.  So this is not a learning experience. I might even cynically believe that planned obsolescence was built into GPU, by Nvidia, that limits its service. However the failiure I encountered has been experienced by  many other owners of 2060S, 2070, 2070S, 3060, 3070ti. From 3 months to year of usage. So it seems this QA issue at Nvidia.

    One thing you could learn from this is that electronic components can (and do) sometimes fail, seemingly at random. The MTBF is not the same as the expected lifespan of a product.

    • Like 1
  4. I'll have to tread lightly here due to the "no politics" policy on the forums, but anything that could refer to Taiwan as an independent nation is a no-go if you want to sell your product in a certain Asian country. There is a 21.000 line long list of words and phrases that are censored (presumably from the MP chat) in \DCS World\Data\censor.lua, many of which are related to Taiwan.

     

    TL;DR: don't hold your breath.

     

    • Like 5
  5. 2 hours ago, Red Dog said:

    I rather thought they were all On no matter.

    Especially when sharing the same frequency like real Andersen base (not in DCS for the limitation to have the same freq on both approach ends of the same runway)

     

     

    The short answer is no.

     

    The longer answer:

    Many/most runways with ILS in both directions are equipped with an interlock that prevents both systems from radiating at the same time. This is a requirement for CAT III (specified in ICAO Annex 10), and it is recommended for CAT I/II systems. If the ILS for both directions use the same frequency, the opposing beacons will interfere with each other, and cannot operate at the same time. The way the coverage sector of the Localizers shown in DCS is a bit misleading, as it indicates that the beacons radiate away from the runway (and thus the opposing beacons), but this is not the case IRL (see the pic below for an illustration). Simultaneous operation on the same frequency will cause erronious monitor readings on the opposing beacon, and the actual signal in space will be corrupted by the interference.

     

    /drPhibes

    Hardware engineer in the R&D dept. of the largest ILS manufacturer on the international market.

    guam2.PNG

    • Like 1
    • Thanks 1
  6. On 8/6/2021 at 12:10 AM, Bunny Clark said:

    TACAN is partially interoperable with VOR if you do the correct frequency to channel conversion.

     

    Not really. TACAN is compatible with DME (TACAN is a DME system with the bearing waveform modulated onto the ranging pulses), but no part of a VOR is compatible with TACAN.

  7. I stand partially corrected. There seems to be intermittent coverage behind the localizer array at LCA. This shouldn't be the case. Back course approaches aren't a thing in this area of operations.

     

    The error reported by the OP is unrelated to this. The entry for the GP in the beacons.lua is rotated 88,955947° clockwise with regard to the LOC, and the 3d model of the M-array GP mast is also rotated approximately 90° CW:

    {
    		display_name = _('');
    		beaconId = 'airfield47_0';
    		type = BEACON_TYPE_ILS_LOCALIZER;
    		callsign = 'ILC';
    		frequency = 110300000.000000;
    		position = { -8990.810547, 7.217739, -210314.343750 };
    		direction = 48.171958;
    		positionGeo = { latitude = 34.860647, longitude = 33.608001 };
    		sceneObjects = {'t:336825842'};
    		chartOffsetX = 3620.000000;
    	};
    
    	{
    		display_name = _('');
    		beaconId = 'airfield47_2';
    		type = BEACON_TYPE_ILS_GLIDESLOPE;
    		callsign = 'ILC';
    		frequency = 110300000.000000;
    		position = { -6839.587402, 5.000005, -208096.250000 };
    		direction = 137.127905;
    		positionGeo = { latitude = 34.881032, longitude = 33.630902 };
    		sceneObjects = {'t:750780863'};
    	};

     

    Screen_210630_104042.png

  8. 13 hours ago, Frederf said:

    Localizer will be usable from both directions (with back signal reverse sensing).

     

    Modern ILS systems do not have a usable back course signal, and back course approaches are not approved for operational use in many parts of the world, including the EU. The log-periodic antennas used by all major ILS manufacturers on the international market are highly directional, and have a front-to-back ratio of around 14dB. No usable signal radiates from the back of the antenna array.

  9. 13 hours ago, xvii-Dietrich said:

     

    None of the regions suggested so far are close to the magnetic nor geographic pole. So "north" is still off-map, so to speak.

     

    Exactly! Case in point: the northernmost part of mainland Norway is approximately as far from the geographic north pole as Houston TX is form the Canadian Border.

    • Like 1
    • Thanks 1
  10. 1 hour ago, Mars Exulte said:

      Dude, you really gotta up your game 😃 Those credits at the end ''blah blah Production'' in other words, it's a guy playing with animations. Which should be a given, since the ships are clearly CGI, but the end credits should cinch it no matter how convincing the animation 😃

     

    He believed that the submarine launched F-15 video was real... Perhaps google can find him a good optometrist?

  11. On 2/8/2021 at 10:51 PM, Snip3r said:

    @aviation360yeah that's what I was talking about. So that should make the jet harder to spot on radar. Would the rcs change based on what part of the jet you're looking at? (Ex. Front, side, back)

     

    RCS is just a static value defined defined for each aircraft. AI values are defined in \DCS World\Scripts\Database\PlaneConst.lua / HelicopterConst.lua, and playable module values are typically defined in the \CoreMods\aircraft\[module_name]\[module_name].lua (e.g. \CoreMods\aircraft\FA-18C\FA-18C.lua).

×
×
  • Create New...