Idents on VOR+DME if one of them is inop

Peter wrote in
:

Yes, and it makes me wonder what they do when the two aren't exactly
co-located. I wonder if there is any sync between e.g. the Biggin ILS
ident and the Biggin VOR ident (both of which have a DME of their
own).

AFAIK they are always colocated. If the ILS has its own DME (which isn't
always the case) then the DME will on a different channel, and have a
different ID, than the one with the VOR. If the ILS doesn't have its own
DME transmitter, then there will be no DME ident when you are tuned to
the localizer, *unless* you have set the DME to hold on the VOR, in which
case you will receive the DME ident off the VOR, and they may not by
synchronized. I regularly do this at my home base, where the ILS has no
DME, but the VOR is on the field. It's not usable for anything except
situational awareness, but in some cases it can be used for identifying
fixes on the approach, depending on what the approach chart says. I've
never worried about the synchronization, because we have separate monitor
switches for the nav and DME.

--
Regards,

Stan

"Jon Woellhaf" wrote in
:

Peter asked, "... does anyone actually do that [identify DME and VOR
together] , if they have an intercom which has separate DME/VOR ident
buttons, for navaids that have the same ident?"

Yes. I identify both at the same time and switch off whichever one I
hear first.

That's what everyone I fly with does. You never know where in the
sequence you'll come in, so you listen to both until you get an ident,
note it, and then turn it off so you don't hear it again. There usually
isn't time to be spending a lot of time doing this, because you usually
do it fairly late in the approach sequence. We can usually only tune the
final navaid after receiving vectors for final, so time becomes
important.

--
Regards,

Stan

In article , Peter
wrote

"Robert M. Gary" wrote:

The period of the ident (a missing ident every 4 as I recall) indicates
that the DME is not being transmited. Listening to the DME on the audio
panel just tells you that you are receiving the VOR (and will provide
the same audio the VOR does).

Is the above true for intercoms that have separate ident buttons for
the DME and the VOR?

Not on the ones I've used. Different pitch, different period.

--
Richard Herring

On Wed, 19 Jan 2005 16:46:35 +0000, Peter wrote
(in message ):

I am aware of the frequency pairing etc. I've been flying IFR for 2-3
years and have always navigated entirely IFR. What confused me was the
concept of identing both together - does anyone actually do that, if
they have an intercom which has separate DME/VOR ident buttons, for
navaids that have the same ident? I've done that for navaids that have
different idents and then the two different idents are obvious.

I am doing the FAA IR from the UK, and thought that perhaps they have
a system in the USA where (the case of the DME and the VOR being
co-located) the DME ident is combined into the VOR ident. Certainly
the King training video gives that impression, but it doesn't make any
sense to me.

The two systems are separate, but the ident from the VOR has a gap when the
DME transmits. If you select both then you the combined audio from both
navaids, but the result is a continous stream of idents :

VOR VOR VOR VOR VOR VOR VOR
DME DME

which you hear as :

VOR VOR VOR DME VOR VOR VOR DME VOR


There is nothing magical, it's just that the ident system is configured such
that the VOR misses every fourth ident, and the DME is synchronised to
transmit during this gap.



If one of them is switched off you would simply not hear it, as in :

VOR VOR VOR VOR VOR VOR VOR

or

DME DME


Or if the DME (say) were in test mode then you might hear :

VOR VOR VOR TST VOR VOR VOR TST VOR


Now, do I select both ? Well I struggle to ident anything (still at the "have
patterns written/printed on plog" stage), and I certainly haven't mastered
the finess of telling them apart ! So, no I don't.

Simon

"Simon Hobson" wrote in message
et...
Now, do I select both ? Well I struggle to ident anything (still at the
"have
patterns written/printed on plog" stage), and I certainly haven't mastered
the finess of telling them apart ! So, no I don't.

You and me both. Anyway, what's the harm in writing them down - means you
can concentrate your brain on other things :-)

D.