VOR/DME Identifiers
John Clonts
"f. VOR/DME, VORTAC, ILS/DME, and LOC/DME facilities are identified by
synchronized identifications which are transmitted on a time share basis.
The VOR or localizer portion of the facility is identified by a coded tone
modulated at 1020 Hz or a combination of code and voice. The TACAN or DME is
identified by a coded tone modulated at 1350 Hz. The DME or TACAN coded
identification is transmitted one time for each three or four times that the
VOR or localizer coded identification is transmitted. When either the VOR or
the DME is inoperative, it is important to recognize which identifier is
retained for the operative facility. A single coded identification with a
repetition interval of approximately 30 seconds indicates that the DME is
operative."
I listened to my local VOR (TPL) with this in mind, but could not discern
between the VOR and the DME ident tones. Surely I should be able to hear
the difference between 1020 and 1350 hz? Is there an exception or other
protocol which could be at play here?
Thanks,
John Clonts
Temple, Texas
Stan Prevost
"John Clonts" <jcl...@hot.rr.com> wrote in message
news:anv8e...@enews4.newsguy.com...
> Aim 1.1.7.f says:
>
> I listened to my local VOR (TPL) with this in mind, but could not discern
> between the VOR and the DME ident tones. Surely I should be able to hear
> the difference between 1020 and 1350 hz? Is there an exception or other
> protocol which could be at play here?
>
They sound very different. Did you have the DME audio selected on the audio
panel and turned up high enough to hear? VOR audio comes through the VOR
receiver, DME audio through the DME receiver, NDB audio through ADF
receiver.
Stan
Dave S
transmits over.(through the VOR reciever)
You will hear the DME ident over the UHF frequency that is discretely
paired with a particular VOR/ILS frequency (DME reciever). Remember that
DME is in another frequency band, and requires a discrete receiver. You
cannot tell if the DME is operative or inoperative by listening to the VOR.
If you have BOTH recievers selected on your audio panel, you should hear
the VOR/ILS ident 3-4 times for every DME ident, and the DME ident will
be at a higher pitch. If you do NOT have both recievers properly
selected, volume up, VOR notch filter off, etc... then you will not hear
both sets of idents as intended.
Dave, PPSEL, AGI/IGI