Vaisala RVP900

Chapter 5 _______________________________________________________ Plot-Assisted Setups
VAISALA______________________________________________________________________ 157
BW Indicates the actual 3 dB bandwidth of the matched filter.
This is the complete width of the passband from the lower
frequency edge to upper frequency edge. Note that the
filters center frequency is fixed at the radars intermediate
frequency, as chosen in the Mb setup command.
DC-Gain Indicates the filters response to DC (zero frequency) input.
The value is a negative number in decibels, or the word
"ZERO" if the filter has a true zero at DC. The filters DC
gain should be kept at a minimum so that fixed offsets in
the A/D converters will not propagate into the synthesized
"I" and "Q" values.
Freq Indicates the mean frequency of the burst.
Pwr Indicates the average power in the full burst sample
window.
Loss The filter loss is a positive number in deciBels, and is only
displayed if the overall burst power exceeds the minimum
valid burst threshold set in the Mb command (clearly, it
would not be possible to compute the filter loss when the
burst waveform is missing). The filter loss is discussed
further in Section 5.4.4 Computation of Filter Loss on page
156.
AFC Indicates the level and status of the AFC voltage at the
IFDR module. The number is the present output level in D-
Units ranging from 100 to +100. The shorter "%" symbol is
used since percentage units correspond in a natural way to
the D-Units.
An additional number in square brackets are printed to the
right of the AFC level to show the encoded bit pattern
which corresponds to that level. This only appears when
the RVP900 deduces that a special digital format is being
used, that is, when the backpanel phase-out lines have been
configured for AFC, or when any of the following are not
true: a) the low and high numeric AFC span is -32768 to
+32767, b) the uplink is enabled, c) the uplink format is
binary, and d) pinmap protocol is OFF. Binary format is
printed in base-10, BCD format is printed in Hex, and
8B4D format is printed with the low 16-bits (four BCD
digits) in Hex and the upper bits in base-10.
The AFC mode s shown to the right of the numerical
value(s), and can take on the following states:
(Disabled) Indicates that neither AFC nor MFC are
enabled. The output voltage remains fixed at
0% (center of its range).
(Manual) Manual Frequency Control (MFC) is
overriding AFC. The U and D commands can
be used to slew the voltage up and down.