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Old 09-02-2019, 07:24 AM   #1
viper2097
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Default IFF - How does it work in the Viper?

Unfortunately, I can't find any information about that in the whole wide web, so I need to ask:

How does IFF work in the Viper generally speaking?

How does radar contacts get interrogated by the own ship? (On the radar in RWS and in STT / With and without datalink)
I guess we'll have HAFU symbology on the FCR(?) like it is with the Hornet?
Are datalink contacts shown on the FCR, HSI, or is there a similar page like the SA page on the bug?
What are the HUD symbology for hostile / unknown / friendly?
I also heard about AIFF, will our one carry that? Whats the difference?

Thx for information.
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Old 09-02-2019, 07:29 AM   #2
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I don't have time to search it myself but if you can't find anything it might endup like the A10C where this is too classified and they basically did not implement it.
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Old 09-02-2019, 10:45 AM   #3
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Quote:
Originally Posted by viper2097 View Post
Unfortunately, I can't find any information about that in the whole wide web, so I need to ask:

How does IFF work in the Viper generally speaking?

How does radar contacts get interrogated by the own ship? (On the radar in RWS and in STT / With and without datalink)
I guess we'll have HAFU symbology on the FCR(?) like it is with the Hornet?
Are datalink contacts shown on the FCR, HSI, or is there a similar page like the SA page on the bug?
What are the HUD symbology for hostile / unknown / friendly?
I also heard about AIFF, will our one carry that? Whats the difference?

Thx for information.
It's complicated but very very simply.....
  • The Viper can interrogate Mode 1,2,3,C,4 and S codes.
  • Selection of which codes to interrogate is done through a combination of a DED page options and an FCR page selection.
  • Colour coded symbols are displayed for matching (or not) IFF responses on both the FCR page and the HSD. Generally these are green or yellow squares overlayed on the radar brick with the mode number in them. Green for matching response, yellow for a non-matching response. Of course a hostile will have no response.
  • No HUD symbology, at least for a Block 50 AFAIK.
  • There's no SA page on the Block 50 Viper. All IFF and Datalink info is shown on the HSD (and FCR) page.
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Old 09-02-2019, 12:15 PM   #4
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@AvroLanc:
Thank you, very helpful input.
Are (new) contacts on the FCR or HSD automaticaly interrogated?
What is the DED page?
So I'll guess the Viper will also have some close combat modes, like verical scan etc. As there is no information on the HUD, is there any indication if that locked contact is friendly, unknown or hostile?

@Mystic_J: Thank you, did not found that specific document so far. Only an older version where IFF was not included. (As it seems to be not included in older versions)
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Old 09-02-2019, 12:27 PM   #5
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No, I think you have to do the interrogation yourself.

DED is the display on the top right, next to the HUD.

Yes, it has a dogfight mode which declutters the HUD and will make some special scan modes available. Not sure if you get any IFF info on the HUD.

And that document is from another sim, where they implemented IFF just recently.
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Old 09-02-2019, 12:39 PM   #6
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Quote:
Originally Posted by viper2097 View Post
@AvroLanc:
Thank you, very helpful input.
Are (new) contacts on the FCR or HSD automaticaly interrogated?
What is the DED page?
So I'll guess the Viper will also have some close combat modes, like verical scan etc. As there is no information on the HUD, is there any indication if that locked contact is friendly, unknown or hostile?

@Mystic_J: Thank you, did not found that specific document so far. Only an older version where IFF was not included. (As it seems to be not included in older versions)
An IFF interrogation is initiated with TMS Left. You can interrogate in SCAN or LOS (Line of sight). SCAN does whole radar volume scan, LOS does a +-15 degree scan about the TDC cursor or bugged contact.

The DED is similar to the UFC display boxes in the Hornet. It does many more things though and is the main data entry method in the Viper.

There's Verical Scan, 20 Degree Scan, Boresight, and Slewable close combat modes. As well as a JHMCS mode. All similar to Hornet.

I don't believe the HUD shows Hostile/Friendly/Unknown status - at least it never does in the 'others sim' or in any manual I've read. You find yourself constantly referencing the FCR page for IFF.
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Old 09-02-2019, 12:55 PM   #7
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Thx, awesome input!
Seen the DED before, just not knew its name.
So I'll guess, that we have to take a look at the FCR page after locking up a target with close combat modes, or JHMCS
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Old 09-02-2019, 01:06 PM   #8
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Quote:
Originally Posted by AvroLanc View Post
  • There's no SA page on the Block 50 Viper. All IFF and Datalink info is shown on the HSD (and FCR) page.
Well, I would argue that the HSD in the F-16 is pretty much like an SA page in the F/A-18, including things like threat rings.


Quote:
Originally Posted by viper2097 View Post
Seen the DED before, just not knew its name.
And it's an insanely powerful tool, despite it's rather unimpressive appearance.
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Old 09-02-2019, 02:00 PM   #9
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Quote:
Originally Posted by QuiGon View Post
Well, I would argue the HSD in the F-16 is pretty much like an SA page in the F/A-18, including things like threat rings.
Agreed, the HSD is much more an SA page than HSI.
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Old 09-03-2019, 12:26 PM   #10
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When it comes to IFF, a lot of stuff are classified. You can get a very generic and broad-view like idea of the whole process which is basically aircraft A asks aircraft B for a specific set of instructinos (code, mode, ecc.) and if they do correspond to what it is expecting then you have a positive IFF.
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