Nautel NV Series Software Update Procedure Download Page 9

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NV Series – Software Update Procedure

Page 7

IS09004D

Issue 1.1

(d) If the

LUT Storage

sub-menu

suggests there are other indexes
stored, repeat only step (c5) while
operating in the applicable preset. Do
not further change the “Default LUT
Height” value; only overwrite the
existing stored LUT. If the transmitter
will only operate at the licensed
mode/power level/frequency (typical),
only one LUT is required. Delete the
remaining stored LUTs to prevent
inadvertent selections by highlighting
them (the line should turn blue) and
pressing the

Delete

button. LUTs can

be saved at any time, and used for a
given Preset by configuring the

LUT

Index

for the associated stored index.

(e) If exciter B is installed manually

change over to exciter B (using the
AUI

Menu

Changeover

screen) and

repeat steps (a) through (d) for exciter
B. Once complete, manually change
over to exciter A.

(f) Select the desired preset or operating

mode. Note that for any FM+HD
mode, the power level displayed in the
AUI’s Presets page is the desired
analog power setting (TPO). The
power reading at the top of the home
page is also the analog portion of the
FM+HD output.

(g) The procedure is complete. Nautel

recommends that you retain at the site
the new RF Drive Power Scale Factor
from

RF Drive Sample Calibration

[6.1, step (h)], the new Calibration
Value from

Exciter HD Calibration

[6.2, step (d)] and the new Default
LUT Height from

LUT Re-Saving

[6.3,

step (c4)] for both exciters A and B as
applicable. Also, email the data to
Nautel ([email protected]).

(h) For future reference, if the NAPC156

Control Interface PWB requires
replacement, you will need to
manually re-enter the new RF Drive
Power Scale Factor after the original
factory EEPROM is loaded into the
replacement PWB.

6.3.1 IMPROVING/FINE TUNING RAMP-
UP TIME

The following procedure is only necessary
to fine tune/improve ramp-up time, as
referenced in paragraph 6.3, step (c3).
While overshooting of the transmitter
power is quite easy to identify, determining
optimal ramp-up time is subjective.

NOTE

When making changes to the “Default LUT
Height”, always ensure that the transmitter
output power does not overshoot, and it
ramps up quickly and smoothly without
alarms.

(a) When the transmitter has settled at

power, monitor the AUI’s

AM-AM

Correction

plot and place the marker

on the plot at the Table Index value
shown in Table 1, noting that the
values are based on the mode/
injection level, and ensure the
measured (LUT) Gain falls in the
range specified.

NOTE

The Table Index Full Scale value on the
AUI’s AM-AM Correction plot is actually
255, not 2047

Table 1:

AM-AM Correction Table Index

Values and Expected LUT Gain vs. Mode

MODE

TABLE

INDEX

VALUE

(LUT)

GAIN

RANGE