50KHz Glideslope?

Who knows something about 50KHz spacing for glideslope receptors?
Traditionally we have 40 GS frequencies, with 150KHz spacing from
329.15MHz to 335 MHz. But I see European ILS's requiring "50KHz
Glideslope spacing". Anyone know what receptors do this? Or why we would
want to do this? 8.33 spacing for VHF coms is easy to understand, but
are 40 ILS frequencies in a given reception area really insufficient?

VOR-DME wrote:, but
are 40 ILS frequencies in a given reception area really insufficient?


Yes.

In article , says...


VOR-DME wrote:, but
are 40 ILS frequencies in a given reception area really insufficient?


Yes.

Well then - what equipment offers this 50KHz spacing.
Not the King KX155A or 165A or the Garmin 430W.

VOR-DME wrote:
In article , says...


VOR-DME wrote:, but

are 40 ILS frequencies in a given reception area really insufficient?


Yes.


Well then - what equipment offers this 50KHz spacing.
Not the King KX155A or 165A or the Garmin 430W.

I presume the airlines that fly to Europe have that capability.

In article , says...


VOR-DME wrote:
In article , says...


VOR-DME wrote:, but

are 40 ILS frequencies in a given reception area really insufficient?


Yes.


Well then - what equipment offers this 50KHz spacing.
Not the King KX155A or 165A or the Garmin 430W.

I presume the airlines that fly to Europe have that capability.

Presuming is good from home, sitting around the fire.
For flying it just doesn't cut it . . .

VOR-DME wrote:
In article , says...


VOR-DME wrote:

In article , says...


VOR-DME wrote:, but


are 40 ILS frequencies in a given reception area really insufficient?


Yes.


Well then - what equipment offers this 50KHz spacing.
Not the King KX155A or 165A or the Garmin 430W.


I presume the airlines that fly to Europe have that capability.


Presuming is good from home, sitting around the fire.
For flying it just doesn't cut it . . .

And your point is?

In article ,
says...


I have not come across this, here in European pilot publications etc.
GA would have picked this up I reckon, because we do use KX155As,
165As, GNSx30s etc.

What we are getting is PRNAV and that is a far bigger problem -
potentially.

The airlines cannot fly something that is not on an approach plate.

Does anyone have a reference for a reduced ILS frequency spacing in
Europe?

A "reference" - do you mean an example?
https://www.sia.aviation-civile.gouv...AIPparSSection
%5CIAC%5CAD%5C2%5C0903_AD-2.LFPN.pdf

This is a very commonly used approach (VOR-DME)
I could list dozens of others requiring "50KHz Glideslope"

In article , says...


In article ,
says...


I have not come across this, here in European pilot publications etc.
GA would have picked this up I reckon, because we do use KX155As,
165As, GNSx30s etc.

What we are getting is PRNAV and that is a far bigger problem -
potentially.

The airlines cannot fly something that is not on an approach plate.

Does anyone have a reference for a reduced ILS frequency spacing in
Europe?

A "reference" - do you mean an example?
https://www.sia.aviation-civile.gouv...AIPparSSection
%5CIAC%5CAD%5C2%5C0903_AD-2.LFPN.pdf

This is a very commonly used approach (VOR-DME)
I could list dozens of others requiring "50KHz Glideslope"



Sorry - Make that ILS-DME

In article ,
says...


That URL doesn't work but I have just looked up the Jeppview plate for
ILS 25 LFPN and the ILS frequency is 110.15.

There are no special notes on this plate.

What happens if one sets up 110.15 on say a KX155A?

The URL worked for other contributors.
The official plate specifically includes the 50Khz limitation mentioned.

In article ,
says...


Update:

It appears this whole topic is meaningless and the result of
somebody's error.

It turns out that all current GA nav radios support 50kHz spacing
(therefore 40 channel glideslope). A few very old (Narco 12A with UGR2
glideslope Rx's ?) units may still be around, but all Garmin and
Honeywell and Narco equipment produced in the last 20 years or more is
certainly compliant.


You should inform the appropriate authorities (French DGAC) of your
discovery. Also Garmin, Bendix King and others, who list their
specifications for glideslope spacing as 150KHz.

Do you have any documentation for your assertions?
This would be a start. . .