Thanks Willfly,
But I have already checked any parameter like GS angle, TCH, DH, etc. And I have compared with other ILS' in Europe, there is no remarkable defference with this one. However I come across with the following paragraph in ICAO ANNEX 10. Please read and tell me what you think. Could it be the reason if 23 R Localizer width is not corresponding the standards in this ANNEX?
ICAO ANNEX 10 Para2.1.11.4
Extent to which sector centred on course line
may be narrowed. It is considered that a radiation sector 10
degrees each side of the localizer course line would be the
minimum sector that could be accepted operationally. It is
desirable that the characteristics of the signal from the
localizer be identical with those specified in Chapter 3 within
the region in the immediate vicinity (region from DDMs 0.155
to zero) of the course line and approximate closely to them out
to 10 degrees, so that the indications of the ILS indicator and
the signals fed to a coupling device, if used, will correspond to
the STandard ILS throughout any manoeuvres necessary in the
transition from the approach to the localizer to establishment
on course line.