Nautel VSHD Exciter, Инструкция по эксплуатации

Страница: 39 / 79

VSHD Exciter Technical Instruction Manual
Page 3-7
Section 3 Operation Issue 2.0
3.1.2 Managing Presets
The preset page’s Mode options increase when using the VSHD exciter (for the AUI, see
Figure 3-7 compared to Figure 2.39 of the VS transmitter’s Operations and Maintenance
Manual ; for the front panel UI, see Figure 3-8 compared to Figure 2.48 of the VS transmitter’s
Operations and Maintenance Manual
). When the VSHD exciter is used, the Mode drop-down
selection list is no longer disabled and instead includes the HD (all-digital), FM+HD (hybrid)
and DRM+ modes of operation.
Basic preset operations such as loading, applying, reloading and saving are the same. The
General and Other Audio tabs contain VSHD pertinent selections, which are described
below.
3.1.2.1 USING THE AUI
Figure 3-7: Presets Page - General tab
General tab changes/additions (see Figure 3-7):
• Mode : select FM, HD, FM+HD or DRM+. If HD or FM+HD, enter:
-
IBOC Injection (Lower):
for FM+HD and HD modes, enter value, in dB, between -20
and -10 dB for the IBOC injection level of the lower sideband of digital carriers. This
value determines the relationship between the digital carriers power and the analog
carrier power. Example: -20 dB indicates that the total RMS power of the digital
carriers will be 1/100 of the total RMS power of the analog carrier. -10 dB indicates
that the total RMS power of the digital carriers will be 1/10 of the total RMS power of
the analog carrier.