C-101 EB VOR DME question

[jasonstory44]

Hi guys, I am having trouble understanding if I should be receiving DME information when I have my VOR tuned to a VOR station with DME. I get the appropriate directional info but no range information. I’ve searched the forums here but can’t seem to understand the answer and most information seems to apply to the CC

 

Any help or guidance is appreciated.

 

Cheers, Jason

[kontiuka]

Hi guys, I am having trouble understanding if I should be receiving DME information when I have my VOR tuned to a VOR station with DME. I get the appropriate directional info but no range information. I’ve searched the forums here but can’t seem to understand the answer and most information seems to apply to the CC

 

Any help or guidance is appreciated.

 

Cheers, Jason

VOR with DME isn't modelled in DCS World for any module unfortunately (even though there are a handful of stations on the maps). The only time you can get DME info is with a TACAN station or a VORTAC station.

[jasonstory44]

Ah I see. So if I tune my Nav radio to a VORTAc frequency it will work?

[kontiuka]

Ah I see. So if I tune my Nav radio to a VORTAc frequency it will work?

Good question. It definitely works when you tune into the VORTACs TACAN channel. But when you tune into the actually frequency (ex. 116.3 MHz for channel 110X), you only get directional info in the EB. For the CC, you get direction and distance. Wonder if it's a bug.

[jasonstory44]

Ok cool, thanks for confirming. Thought I was losing my mind

[kontiuka]

Ok cool, thanks for confirming. Thought I was losing my mind

np. Hopefully, a developer will chime in.

[Vibora]

Good question. It definitely works when you tune into the VORTACs TACAN channel. But when you tune into the actually frequency (ex. 116.3 MHz for channel 110X), you only get directional info in the EB. For the CC, you get direction and distance. Wonder if it's a bug.

In the C-101EB there is a TACAN receiver and a VOR receiver, but there is no DME receiver.

A typical VORTAC station on ground consists of a VOR station and a TACAN station together in the same sitting. So it has a VOR part (that generates radials electronically by means of spatial modulation) and a TACAN part that a civil DME receiver is able to read, since TACAN DME part is compatible with a civil DME receiver. So, a DME in a civil aircraft will be able to read the DME part of a TACAN while a VOR receiver won't be able to read the directional part of a TACAN, which uses a different method than VOR to generate radials.

Therefore, when you tune in 110X in the C-101EB you get both direction (radial) and distance since it reads the TACAN part of the VORTAC.

When you tune in 116.3 MHz with the VOR equipment you get the VOR part of the VORTAC and therefore you get directional indication, but you don't get distance since there is no DME receiver in the C-101. Unless you have 110X tuned in, of course.

In the C-101CC there is a VOR receiver and a DME receiver, though no TACAN receiver.

When you tune 116.3 MHz in the C-101CC you get both directional indication (from the VOR part of the VORTAC) and DME indication (from the TACAN part of the VORTAC), since, as said above, a DME receiver is compatible with a TACAN DME part and able to get distance reading out of it.

Hope it's all clear now :)

[jasonstory44]

Thank you. Perfect explanation.

[kontiuka]

In the C-101EB ...

thanks muchly

[Vibora]

Welcome :)

[jasonstory44]

What’s the reason behind the CC variant not having TACAN by design? To me that seems counterintuitive by the aircraft designers but perhaps I’m not considering something obvious

[kontiuka]

What’s the reason behind the CC variant not having TACAN by design? To me that seems counterintuitive by the aircraft designers but perhaps I’m not considering something obvious

I think because the primary users like Chile and Honduras don't have TACAN stations. Jordan, though, would have more use for TACAN equipment I would think.

[Vibora]

That's it. Wouldn't make much sense to have a TACAN receiver in a country and area without TACAN stations.