reported TACAN in F18C missing DME signal after low-level flight.

[NBee]

It seems as the TACAN  in the F18C does not automatic pick up the DME (Distance) signal after low-level flight.

Starting at 15000’ setting TACAN to Cn 13X, picking up the TACAN signal + DME.

Then decent to low-level behind mountains, stay low until TCN signal diapers.

Start climb until TCN signal is picked up by the receiver => DME not updating distance to TCN

Turning TCN in aircraft OFF then ON brings DME back.

13.trk dcs_13.log CVN73_TX1.miz

[rob10]

That's an old and intermittent bug (which fortunately the work around is pretty easy - TCN off/on).  Are you consistently seeing it when flying low then back up?  Imperfect that you need to do the ON/OFF trick, but because there is that solution and it's not easily reproducible (no consistent set of conditions to make it happen, it's pretty random) I'm not sure it's high on fix list.

[BIGNEWY]

11 minutes ago, rob10 said:

That's an old and intermittent bug (which fortunately the work around is pretty easy - TCN off/on).  Are you consistently seeing it when flying low then back up?  Imperfect that you need to do the ON/OFF trick, but because there is that solution and it's not easily reproducible (no consistent set of conditions to make it happen, it's pretty random) I'm not sure it's high on fix list.

This was actually address recently so if you are seeing issues we would want to see a track replay. 

thanks

56 minutes ago, NBee said:

It seems as the TACAN  in the F18C does not automatic pick up the DME (Distance) signal after low-level flight.

Starting at 15000’ setting TACAN to Cn 13X, picking up the TACAN signal + DME.

Then decent to low-level behind mountains, stay low until TCN signal diapers.

Start climb until TCN signal is picked up by the receiver => DME not updating distance to TCN

Turning TCN in aircraft OFF then ON brings DME back.

13.trk 3.76 MB · 5 downloads dcs_13.log 99.1 kB · 4 downloads CVN73_TX1.miz 12.26 kB · 4 downloads

we will take a look, but I will move it to the F/A-18C section

thanks

[rob10]

1 minute ago, BIGNEWY said:

This was actually address recently so if you are seeing issues we would want to see a track replay. 

thanks

Thanks @BIGNEWY.  I think I did know that now that you say that.  I feel like it happened to me recently, but it's so rare and random that maybe it was a while ago.  Will grab a track if I see it again.

[BIGNEWY]

5 minutes ago, rob10 said:

Thanks @BIGNEWY.  I think I did know that now that you say that.  I feel like it happened to me recently, but it's so rare and random that maybe it was a while ago.  Will grab a track if I see it again.

Yeah it has always been a difficult one to reproduce. But there was a change when there was a fix for the network / server issues recently and the results were good. 

[SickSidewinder9]

DME also doesn't seem to do slant range.  Not with carriers, anyway.  How does the plane know the TACAN station elevation?

[NBee]

Tanks @BIGNEWY

Just for info

I tried same mission with A10CII + AV8 + Mirage 2000 and was not able to reproduce.

But F-5E => same problem no DME on TCN after low-level flight: see attached log and track file.

So perhaps it’s not just a F-18C issue?

5.log 5.trk

[BIGNEWY]

Hi, 

we think we have spotted the issue, sometimes on the first run of DCS after LOS has been lost the range freezes on the F-5. We are going to do a report and ask the team to take a look. 

Note restarting TCN is a work around. 

We can not reproduce if we have already used DCS before testing the bug, so something strange seems to be happening but also seems to be terrain specific. 

thank you