Aeroflex NAV 2000R Operation Manual page 35

Aeroflex Operation Manual
DDM
Programs the modulation percentage of the 90 and 150 Hz tones. The valid range for this field is from
.000 to .800 DDM in .001 steps. The NAV 2000R computes the percent of modulation ratio between the
90 and 150 Hz tones required to produce the commanded DDM. The modulation percentage of each
tone will be set to the proper ratio and with both tones totaling the standard modulation of 80%. The
default value for this field is .000 DDM, 40% modulation each.
Valid Glideslope DDM "HOT" keys will automatically set the DDM value in the DDM field. This is true
even if the DDM field is not currently selected. If an invalid Glideslope DDM hot key is pressed, the
system will display, momentarily on the prompt line, the warning message; "NON-STANDARD DDM
VALUE".
UP/DOWN
Specifies whether the Glideslope reference is either UP/150 or DOWN/90. This is a discrete toggle field
type and the default setting is UP/150.
FREQ. MHz
This field allows the RF frequency to be programmed. The RF frequency may be programmed in
0.00001 MHz steps within the NAV 2000R frequency range of 0.15 MHz to 450 MHz.
ILS PAIR
An alternative field is selected by means of the +/- (ILS) button, while the FREQ MHz field is highlighted.
This field allows the paired ILS frequency to be used to change the actual Glideslope frequency being
generated. With the ILS PAIR window displayed, only paired frequencies of 108.1 to 111.95 preassigned
for ILS operation may be selected. A listing of these preassigned frequencies may be displayed by
pressing the RCL button followed by the LOC/GS button. The ENT button will return the user to the
previous display. Pressing the SEL button with the ILS PAIR field highlighted will cause the CHANNEL
field to be selected. The up and down arrow keys will then cause the ILS PAIR frequency selection to
step through preassigned ILS frequency pairing.
CHANNEL
This field steps the RF frequency output up and down by using the cursor control up and down arrow
keys. With FREQ MHz window displayed, the output frequency will "STEP" up or down as selected by
150 KHz steps. With ILS PAIR window displayed, the output frequency will step up or down through the
preassigned ILS paired frequency.
TOTAL %MOD
This field allows changing all the percent modulation fields respective to one another. That is, changing
the total percent modulation will allow all current modulations to be changed equally, maintaining the
ratios between one another.
PAGE 2:
90 Hz FREQ
This field programs the 90 Hz frequency. A frequency from 72.0 Hz to 108.0 Hz in 0.1 Hz steps may be
entered. Any frequency other than the default setting of 90.0 Hz will cause the VAL flag to enunciate.
NAV 2000R SIGNAL GENERATOR - REV. 0 – JULY 26, 2007 - PG 3-15