Orolia GSG-5 Series, Руководство пользователя с руководством по SCPI, Страница: 103 / 392

Note: When the power settings of individual channels are changed
during scenario execution (via the > Events menu, or protocol) the
power range will be further limited so that the maximum difference
between the strongest and the weakest signal is never more than
72 dB.
To access the Transmit Power view, navigate to Options > Transmit Power . This view
also allows you to adjust the external attenuation (see "Adjusting External Attenuation"
on page 90 ), and noise (see "Adjusting Noise Generation" on page 91 ).
Figure 3-24:
Configuring transmit power
Antenna cable length
The recommended Transmit power setting , assuming relatively short cables and that no
external attenuators are used, is -125.0 dBm . If long cables are used, it is recommended
that these are simulated by adjusting the external attenuation (see also "Adjusting
External Attenuation" on page 90 ).
The Transmit Power set in the Options menu is assigned to the signal type with the
highest power level, and all others are set relative to that.
Considerations
A common problem is that signals too strong or too weak are used. A signal too strong will
typically ‘jam’ the receiver, causing it to erroneously find many shadow signals. It is recom-
mended that you familiarize yourself with the typical signal/noise values for real satellites,
and try to obtain similar values when using this unit. When the signal strength is correctly
set, the receiver will respond directly and logically to changes in signal power.
The following table shows the offsets when referencing GPS L1 C/A as zero dB offset:
3.6 "Options" Menu
User Manual GSG-5/6 Series Rev. 27 87