User's Manual

RVP8 User’s Manual
October 2005
TTY Nonvolatile Setups
3–6
3.2 View/Modify Dialogs
The M menu may be used to view, and optionally to modify, all of the current settings. The
current value of each parameter is printed on the screen, and the TTY pauses for input at the end
of the line. Pressing Return advances to the next parameter, leaving the present one unchanged.
You may also type U to move back up in the list, and Q to exit from the list at any time.
Typing a numeric or YES/NO response (as appropriate to the parameter) changes the
parameter’s value, and displays the line again with the new value. All numbers are entered in
base ten, and may include a decimal point and minus sign. In some cases, several parameters are
displayed on one line, in which case, as many parameters are changed as there are new values
entered. In all cases, the numbers are checked to be within reasonable bounds, and an error
message (listing those bounds) is printed if the limits are exceeded. Note that changes to the
settings (generally) do not take effect until after the Q command is typed, at which point the
RVP8 exits the local TTY menu and resumes its normal processing operations.
The M menu provides access to a large number of configuration settings. As a result, all of the
M menu commands begin with the letter “M” and are followed by a lower case letter which
represents a subcategory, i.e., Mb (Burst Pulse and AFC), Mc (Overall Configuration), Mf
(Clutter Filters), Mp (Processing Options), Mt (Triggers and Timing), Mz (Transmissions and
Modulations), M+ (Debug Options). The ?? command by itself prints the entire set of
questions so that you can make a hard copy.
The M menu always works from the current parameter values, not from the saved values in
non-volatile RAM. If the host computer has modified some of the current values, then you will
see these changes as you skip through the setup list. However, typing S at that point would save
all of the current settings and would, perhaps, make many changes to the original non-volatile
settings. In general, to make an incremental change to the saved settings, first type R to restore
all of the saved values, then use the M menu to make the changes starting from that point, and S
to save the new values.
A listing of the parameters that can be viewed and modified with the M menu is detailed in the
following subsections. In each case, the line of text is shown exactly as it appears on the TTY
with the factory default settings. A definition of each parameter is given and, if applicable, the
lower and upper numeric bounds are shown.
3.2.1 Mc — Top Level Configuration
This set of commands configure general properties of the RVP8/IFD and RVP8 cards.
Acquisition clock: 35.9751 MHz
This is the frequency of the acqusition sampling clock in the IFD module. This will
generally be in the 72MHz range for the RVP8 CAT-5E IFD, and in the 36MHz range
for the legacy RVP7 IFD. If you are locking the IFD to an external reference, the
center frequency of the installed VCXO is entered (see section 2.2.12).
Limits: 33.33 to 80 MHz