| INSTRUMENT_DESC |
INSTRUMENT: PLANETARY RADIO ASTRONOMY RECEIVER
SPACECRAFT: VOYAGER 2
Instrument Information
======================
Instrument Id : PRA
Instrument Host Id : VG2
Instrument Name : PLANETARY RADIO ASTRONOMY
RECEIVER
Instrument Type : RADIO SPECTROMETER
PI Name : JAMES W. WARWICK
Build Date : UNK
Instrument Mass : 7.700000
Instrument Height : UNK
Instrument Length : UNK
Instrument Width : UNK
Instrument Manufacturer Name : MARTIN MARIETTA
Instrument Serial Number : UNK
Instrument Description
======================
The Voyager Planetary Radio Astronomy (PRA) receiver comprises
a 200-channel radio receiver which covers the range from 1.2
kHz to 40 MHz. The receiver is capable of operation in 14
distinct useful modes. The instrument returns 16-bit status
words, which generally replace the first two eight-bit data
numbers within a single scan of 200 data numbers. The channels
are numbered so that the lowest frequency channel (1.2 kHz
center frequency - cf) is channel number 200. Channels in the
range 1 to 130 are referred to as 'high band', and the
remaining channels as 'low band'. In low band, the channel
spacing is 19.2 kHz. In high band, the lowest channel (cf) is
at 1.3 MHz, and the channel spacing is 307.2 kHz. The
instrument is sensitive to, and can distinguish between, the
opposing states of circular polarization of an incoming wave.
THE PRA STATUS WORD
-------------------
The PRA status word is a 16-bit quantity. The bits are
interpreted as follows (in the format S(n), where n is the nth
bit of the status word; bits are numbered zero through fifteen,
with the Most Significant Bit (MSB) as bit zero):
S(0) - phase calibrator on
S(1) through S(4) - PRA mode (see below)
S(5) - A/D from lower channel
S(6) - RHC from upper channel
S(7) - PLL closed
S(8) - PLL unlocked
S(9) - channel toggling disabled *** see below
S(10) - calibrate power on
S(11) - calibrate bypass open *** see below
S(12) - lower preamp selected
S(13) - 45 dB attenuator in
S(14) - 30 dB attenuator in
S(15) - 15 dB attenuator in
*** the meanings of S(9) and S(11) were changed around 1980.
For status words returned after this time, bits S(9) and
S(11) represent a 2-bit POR counter. These bits are
overwritten by the spacecraft FDS, and the counter is
incremented every time that the FDS detects a PRA POR. The
FDS assumes that a POR has occurred whenever it sees a PRA
status word with all three attenuator bits set, since this
is the power-up condition of the PRA.
Graphically, this is:
| 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 |
---------------------------- -----------------------------
|PHASE | FIXED |POLHI| POL |HARAD | A/D | RHC | LOOP |
| CAL | FREQ | OR |SWITCH| OR | FROM |UPPER | CLOSED|
| ON | MODE |LEVEL| OFF | HF |LOWER | | |
---------------------------- -----------------------------
| 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 |
---------------------------- -----------------------------
| LOOP | CHAN | CAL | CAL |LOWER | 45DB | 30DB | 15DB |
| UN- | TOGGLE|POWER|BYPASS|PREAMP| IN | IN | IN |
|LOCKED|DISABLE| ON | OPEN |SELECT| | | |
---------------------------- -----------------------------
Bits S(1) through S(4) return the mode in which the PRA
instrument is running. These are as follows:
0000 - POLLO
0001 - HARAD
0010 - POLLO1
0011 - HARAD1
0100 - LEVEL
0101 - LEVEL1
0110 - LEVEL2
0111 - LEVEL3
1000 - FIXLOL
1001 - FIXLOH
1010 - VLOBRL
1011 - VLOBRH
1100 - XXXXXL
1101 - XXXXXH
1110 - POLHIL
1111 - POLHIH
For more information describing these modes, please refer
to the section entitled 'Operating Modes' below.
Configuration Command
---------------------
The PRA configuration command is contained in the EDR header.
It is a 16-bit word whose last four bits are always '0011'. The
remaining bits are:
C(0) - calibrator power on
C(1) - phase calibrate on
C(2) - calibrator bypass open
C(3) - A/D from upper
C(4) - channel toggle disable
C(5) - loop closed
C(6) - 45 dB attenuator out
C(7) - unused
C(8) - calibrate inject
C(9) - upper preamp select
C(10) - 30 dB attenuator out
C(11) - 15 dB attenuator out
C(12) - 0
C(13) - 0
C(14) - 1
C(15) - 1
| 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 |
------------------------------ ----------------------------
| CAL | PHASE | CAL | A/D | CHAN | LOOP | 45DB| |
| POWER| CAL | BYPASS| FROM | TOGGLE|CLOSED| OUT |UNUSED|
| ON | ON | OPEN | UPPER|DISABLE| | | |
------------------------------ ----------------------------
| 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 |
------------------------------ ----------------------------
| CAL | UPPER | 30DB | 15DB| | | | |
|INJECT| PREAMP| OUT | OUT | 0 | 0 | 1 | 1 |
| | SELECT| | | | | | |
------------------------------ ----------------------------
Note that many (but not all!) of these bits are the logical
inverse of bits in the status word.
MODE WORD
M(0) - fixed frequency mode
M(1) - POLHI or LEVEL
M(2) - polarization switch off
M(3) - HARAD or HF
M(4) to M(11) - frequency bits
M(12) - 0
M(13) - 0
M(14) - 1
M(15) - 1
| 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 |
-------------------------------- -------------------------
| FIXED | POLHI | POL | HARAD | | | | |
| FREQ | OR | SWITCH| OR | F | R | E | Q |
| MODE | LEVEL | OFF | HF | | | | |
-------------------------------- -------------------------
| 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 |
-------------------------------- -------------------------
| | | | | | | | |
| B | I | T | S | 0 | 0 | 1 | 1 |
| | | | | | | | |
-------------------------------- -------------------------
Science Objectives
==================
The Planetary Radio Astronomy (PRA) experiments' primary
objective is to locate and explain kilometric, hectometric, and
decametric radio emissions from the planets, to measure plasma
resonances near the giant planets, and to detect lightning on
the giant planets. They have also been successful at observing
solar radio emissions from the perspective of the outer solar
system.
The Voyager Planetary Radio Astronomy experiment is designed to
investigate naturally-occurring radio emissions from the outer
planets and Sun. Radio emissions from Jupiter have been known
from Earth-based measurements since 1955; PRA represents the
first attempt to survey those emissions, and to perform near-
encounter searches for radio emissions from the other gas
planets.
Radio emissions can be used to determine the rate of rotation
of the inner core of a planet; to determine the existence of a
magnetic field and search for magnetic anomalies. Radio
emissions are often the only remote diagnostic for interactions
occurring in the portions of magnetospheres through which a
spacecraft does not pass. This is particularly true for the
inner magnetosphere, which usually goes unsampled.
PRA is also sensitive to impacts on the spacecraft by micron-
sized dust particles. Particularly in its high data rate modes,
the information obtained therefrom produces insights into the
processes which occur under such situations.
Calibration Description
=======================
The Planetary Radio Astronomy (PRA) receivers were calibrated
under environmentally-controlled conditions and over the entire
frequency and dynamic range of the instruments. This
calibration consisted in application of a known narrow-band
signal across the inputs and recording the receiver outputs.
This falls far short of an overall, front-to-back calibration
of the instruments, including their antennas performing on the
actual spacecraft in deep space under conditions of perfect
vacuum. This full calibration was not possible for many reasons.
To fill this gap, we have implemented software programs that
electromagnetically model the spacecraft with, in practice, 168
conducting elements; in principle, with more powerful
computers, this limitation could be made even less restrictive.
The ideal for which we strive is a conversion of the receivers'
data numbers to absolute flux density values for signals of
known direction of arrival and polarization.
The laboratory calibrations provide us with power levels for
each data number (DN) and each frequency in terms of known
inputs across the antenna terminals of each of the experiment's
two monopoles. Calibrations were carried out over a range of
receiver temperatures, but in practice the stability of the
receiver as a function of temperature and the stability of the
temperature of the receiver as a function of mission phase and
the status of the overall spacecraft have been such as to allow
us to use a single calibration curve for each DN and for each
frequency.
The minimum value for the wave flux density is frequency
dependent varying from 5.E-20 W M**-2 Hz**-1 at frequencies
below 1.5 MHz to 5.E-19 to frequencies above 1.5 MHz. The
maximum wave flux density is typically 50 dB above the minimum
values. The instrument noise level also is frequency dependent.
It is about 1.E-19 W M**-2 Hz**-1 below 1.5 MHz. The noise at
10 MHz is still about 1E-19 W M**-2 Hz**-1, increases to about
1.E-17 W M**-2 Hz**-1 at 25 MHz and then decreases to an
intermediate value at 40 MHz.
The low-band operation of the receivers, from 1.2 kHz to 1326.0
kHz, and the high-band operation of the receiver, from 1228.8
kHz to 40.5504 MHz, differ. In low-band the receiver operates
with a sharply tuned filter only 1 kHz broad at the 3 dB points
and in high-band, with a 200 kHz filter. The gain of the
receivers is designed in such a way that the output increases
discontinuously by 23 dB as they tune downward through the
transition frequency. This causes the receiver output to remain
constant if its input is broadband noise sensibly constant
across the transition point.
If unpolarized radiation falls orthogonally on each monopole,
the total unpolarized flux density for signals below about 5
MHz can be roughly estimated to be
S = So (10**(m/1000)),
where m is the channel reading in millibels and So is
So = 1.5E-21 (W/Hz m**2).
With courage, one may even use these formulas at higher
frequencies. But, for more accurate values at low frequencies,
or for significant flux density values at higher frequencies,
it is necessary to use the spacecraft EM modeling techniques
mentioned above. Since the resulting flux density values depend
on polarization of the emission there is no practical way to
provide the general user with simple algorithms to convert
millibels to flux density.
Detectors
=========
Detector ID : PRA ANTENNA
Detector Type : MONOPOLE PR ANTENNA
Nominal Operating Temperature : 298
Data Rate : 266.667
Sample Bits : 8
Total FOVs : 1
Horizontal FOV : 360
Vertical FOV : 180
FOVs : 1
The Planetary Radio Astronomy (PRA) Antennas are 10 meter BeCu
hollow tubes 0.5 inches in diameter mounted orthogonal to one
another.
'PRA' Section Parameter 'WAVE FLUX DENSITY'
-------------------------------------------
Instrument Parameter Name : WAVE FLUX DENSITY
Sampling Parameter Name : FREQUENCY
Instrument Parameter Unit : WATT/METER**2/HERTZ
Minimum Instrument Parameter : 1400.000000
Maximum Instrument Parameter : 17000.000000
Noise Level : 2400.000000
Minimum Sampling Parameter : 700.000000
Maximum Sampling Parameter : 41336000.000000
Sampling Parameter Unit : HERTZ
Electronics
===========
Electronics ID : PRA
The PRA consists of two superhetordyne receivers, one for the
range from 1326.0 to 1.2 kHz and a second for the range 40.55
to 1.5 MHz.
Instrument Mounting
===================
Platform or mounting name : SPACECRAFT BUS
Operational Modes
=================
PRA Mode 'POLLO'
----------------
Instrument Mode ID : POLLO
Instrument Power Consumption : 6.7
Data produced every 30 msec; 25 msec of integration; bandwidth
is 200 kHz in high band, 1 kHz in low band. Channel spacing is
307.2 kHz in high band and 19.2 kHz in low band. The lowest
high band channel is at 1.3 MHz (cf), and the lowest low band
channel is at 1.2 kHz (cf). Data come from either the upper
instrument channel or the lower instrument channel only. That
is, THERE IS NO CHANNEL TOGGLING, regardless of the setting of
the configuration command. Polarization of data word number 'n'
is reversed each time that a MODE command is received (usually
every six seconds).
STATUS X000 000X XXXX XXXX
Odd numbered data words 003-129 contain LH, UC data;
Odd numbered data words 131-199 contain RH, UC data;
Even numbered data words 004-130 contain RH, UC data;
Even numbered data words 132-200 contain LH, UC data.
STATUS X000 001X XXXX XXXX
Odd numbered data words 003-129 contain RH, UC data;
Odd numbered data words 131-199 contain LH, UC data;
Even numbered data words 004-130 contain LH, UC data;
Even numbered data words 132-200 contain RH, UC data.
STATUS X000 010X XXXX XXXX
Odd numbered data words 003-129 contain RH, LC data;
Odd numbered data words 131-199 contain LH, LC data;
Even numbered data words 004-130 contain LH, LC data;
Even numbered data words 132-200 contain RH, LC data.
STATUS X000 011X XXXX XXXX
Odd numbered data words 003-129 contain LH, LC data;
Odd numbered data words 131-199 contain RH, LC data;
Even numbered data words 004-130 contain RH, LC data;
Even numbered data words 132-200 contain LH, LC data.
PRA Mode 'POLLO1'
-----------------
Instrument Mode ID : POLLO1
Instrument Power Consumption : 6.7
Data produced every 30 msec; 25 msec of integration; bandwidth
is 200 kHz in high band, 1 kHz in low band. Channel spacing is
307.2 kHz in high band and 19.2 kHz in low band. The lowest
high band channel is at 1.3 MHz (cf), and the lowest low band
channel is at 1.2 kHz (cf). Data come from either the upper
instrument channel or the lower instrument channel only. That
is, THERE IS NO CHANNEL TOGGLING, regardless of the setting of
the configuration command. Polarization does not alternate
between adjacent channels.
STATUS X001 000X XXXX XXXX
Data words 003-130 contain LH, UC data;
Data words 131-200 contain RH, UC data.
STATUS X001 001X XXXX XXXX
Data words 003-130 contain RH, UC data;
Data words 131-200 contain LH, UC data.
STATUS X001 010X XXXX XXXX
Data words 003-130 contain RH, LC data;
Data words 131-200 contain LH, UC data.
STATUS X001 011X XXXX XXXX
Data words 003-130 contain LH, LC data;
Data words 131-200 contain RH, UC data.
PRA Mode 'HARAD'
----------------
Instrument Mode ID : HARAD
Instrument Power Consumption : 6.7
Data produced every 30 msec; 25 msec of integration; bandwidth
is 200 kHz in high band, 800 Hz in low band. Channel spacing is
307.2 kHz in high band and 19.2 kHz in low band. The lowest
high band channel is at 1.3 MHz (cf), and the lowest low band
channel is at 2.4 kHz (cf). Data come from either the upper
instrument channel or the lower instrument channel only. That
is, THERE IS NO CHANNEL TOGGLING, regardless of the setting of
the configuration command. Polarization of data word number 'n'
is reversed each time that a MODE command is received (usually
every six seconds).
STATUS X000 100X XXXX XXXX
Odd numbered data words 003-129 contain LH, UC data;
Odd numbered data words 131-199 contain RH, UC data;
Even numbered data words 004-130 contain RH, UC data;
Even numbered data words 132-200 contain LH, UC data.
STATUS X000 101X XXXX XXXX
Odd numbered data words 003-129 contain RH, UC data;
Odd numbered data words 131-199 contain LH, UC data;
Even numbered data words 004-130 contain LH, UC data;
Even numbered data words 132-200 contain RH, UC data.
STATUS X000 110X XXXX XXXX
Odd numbered data words 003-129 contain RH, LC data;
Odd numbered data words 131-199 contain LH, LC data;
Even numbered data words 004-130 contain LH, LC data;
Even numbered data words 132-200 contain RH, LC data.
STATUS X000 111X XXXX XXXX
Odd numbered data words 003-129 contain LH, LC data;
Odd numbered data words 131-199 contain RH, LC data;
Even numbered data words 004-130 contain RH, LC data;
Even numbered data words 132-200 contain LH, LC data.
PRA Mode 'HARAD1'
-----------------
Instrument Mode ID : HARAD1
Instrument Power Consumption : 6.7
Data produced every 30 msec; 25 msec of integration; bandwidth
is 200 kHz in high band, 1 kHz in low band. Channel spacing is
307.2 kHz in high band and 19.2 kHz in low band. The lowest
high band channel is at 1.3 MHz (cf), and the lowest low band
channel is at 2.4 kHz (cf). Data come from either the upper
instrument channel or the lower instrument channel only. That
is, THERE IS NO CHANNEL TOGGLING, regardless of the setting of
the configuration command. Polarization does not alternate
between adjacent channels.
STATUS X001 100X XXXX XXXX
Data words 003-130 contain LH, UC data;
Data words 131-200 contain RH, UC data.
STATUS X001 101X XXXX XXXX
Data words 003-130 contain RH, UC data;
Data words 131-200 contain LH, UC data.
** THE FOLLOWING TWO DESCRIPTIONS ARE UNDOCUMENTED, but
follow logically from the behavior of the instrument in
the other modes. Treat them with caution, however.
STATUS X001 110X XXXX XXXX
Data words 003-130 contain RH, LC data;
Data words 131-200 contain LH, UC data.
STATUS X001 111X XXXX XXXX
Data words 003-130 contain LH, LC data;
Data words 131-200 contain RH, UC data.
PRA Mode 'LEVEL'
----------------
Instrument Mode ID : LEVEL
Instrument Power Consumption : 6.7
Data produced every 30 msec; 25 msec of integration. Channel
spacing is 307.2 kHz in high band and 19.2 kHz in low band. The
lowest high band channel is at 1.3 MHz (cf), and the lowest low
band channel is at 1.2 kHz (cf). Bandwidth is 200 kHz in high
band, 1 kHz in low band. Polarization alternates every data
word.
STATUS X010 00XX X0XX XXXX
Take the channel number modulo 4
Data words 003-130:
Channel modulo 4 0 1 2 3
Data RH, UC RH, LC LH, LC LH, UC
Data words 131-200:
Channel modulo 4 0 1 2 3
Data LH, UC LH, LC RH, LC RH, UC
STATUS X010 00XX X1XX XXXX
Odd numbered data words 003-129 contain LH, UC data;
Odd numbered data words 131-199 contain RH, UC data;
Even numbered data words 004-130 contain RH, UC data;
Even numbered data words 132-200 contain LH, UC data.
STATUS X010 01XX X0XX XXXX
Take the channel number modulo 4
Data words 003-130:
Channel modulo 4 0 1 2 3
Data LH, LC LH, UC RH, UC RH, LC
Data words 131-200:
Channel modulo 4 0 1 2 3
Data RH, LC RH, UC LH, UC LH, LC
STATUS X010 01XX X1XX XXXX
Odd numbered data words 003-129 contain RH, LC data;
Odd numbered data words 131-199 contain LH, LC data;
Even numbered data words 004-130 contain LH, LC data;
Even numbered data words 132-200 contain RH, LC data.
PRA Mode 'LEVEL1'
-----------------
Instrument Mode ID : LEVEL1
Instrument Power Consumption : 6.7
Data produced every 30 msec; 25 msec of integration. Channel
spacing is 307.2 kHz in high band and 19.2 kHz in low band. The
lowest high band channel is at 1.3 MHz (cf), and the lowest low
band channel is at 1.2 kHz (cf). Bandwidth is 200 kHz in high
band, 800 Hz in low band. Polarization alternates every data
word.
STATUS X010 10XX X0XX XXXX
Take the channel number modulo 4
Data words 003-130:
Channel modulo 4 0 1 2 3
Data RH, UC RH, LC LH, LC LH, UC
Data words 131-200:
Channel modulo 4 0 1 2 3
Data LH, UC LH, LC RH, LC RH, UC
STATUS X010 00XX X1XX XXXX
Odd numbered data words 003-129 contain LH, UC data;
Odd numbered data words 131-199 contain RH, UC data;
Even numbered data words 004-130 contain RH, UC data;
Even numbered data words 132-200 contain LH, UC data.
STATUS X010 11XX X0XX XXXX
Take the channel number modulo 4
Data words 003-130:
Channel modulo 4 0 1 2 3
Data LH, LC LH, UC RH, UC RH, LC
Data words 131-200:
Channel modulo 4 0 1 2 3
Data RH, LC RH, UC LH, UC LH, LC
STATUS X010 11XX X1XX XXXX
Odd numbered data words 003-129 contain RH, LC data;
Odd numbered data words 131-199 contain LH, LC data;
Even numbered data words 004-130 contain LH, LC data;
Even numbered data words 132-200 contain RH, LC data.
PRA Mode 'LEVEL2'
-----------------
Instrument Mode ID : LEVEL2
Instrument Power Consumption : 6.7
Data produced every 30 msec; 25 msec of integration. Channel
spacing is 307.2 kHz in high band and 19.2 kHz in low band. The
lowest high band channel is at 1.3 MHz (cf), and the lowest low
band channel is at 1.2 kHz (cf). Bandwidth is 200 kHz in high
band, 1 kHz in low band. Polarization does not alternate.
STATUS X011 00XX X0XX XXXX
Take the channel number modulo 4
Data words 003-130:
Channel modulo 4 0 1 2 3
Data LH, UC RH, LC RH, LC LH, UC
Data words 131-200:
Channel modulo 4 0 1 2 3
Data RH, UC LH, LC LH, LC RH, UC
STATUS X011 00XX X1XX XXXX
Data words 003-130 contain LH, UC data;
Data words 131-200 contain RH, UC data;
STATUS X011 01XX X0XX XXXX
Take the channel number modulo 4
Data words 003-130:
Channel modulo 4 0 1 2 3
Data RH, LC LH, UC LH, UC RH, LC
Data words 131-200:
Channel modulo 4 0 1 2 3
Data LH, LC RH, UC RH, UC LH, LC
STATUS X011 01XX X1XX XXXX
Data words 003-130 contain RH, LC data;
Data words 131-200 contain LH, LC data;
PRA Mode 'Level3'
-----------------
Instrument Mode ID : LEVEL3
Instrument Power Consumption : 6.7
Data produced every 30 msec; 25 msec of integration. Channel
spacing is 307.2 kHz in high band and 19.2 kHz in low band. The
lowest high band channel is at 1.3 MHz (cf), and the lowest low
band channel is at 1.2 kHz (cf). Bandwidth is 200 kHz in high
band, 800 Hz in low band. Polarization does not alternate.
STATUS X011 10XX X0XX XXXX
Take the channel number modulo 4
Data words 003-130:
Channel modulo 4 0 1 2 3
Data LH, UC RH, LC RH, LC LH, UC
Data words 131-200:
Channel modulo 4 0 1 2 3
Data RH, UC LH, LC LH, LC RH, UC
STATUS X011 10XX X1XX XXXX
Data words 003-130 contain LH, UC data;
Data words 131-200 contain RH, UC data;
STATUS X011 11XX X0XX XXXX
Take the channel number modulo 4
Data words 003-130:
Channel modulo 4 0 1 2 3
Data RH, LC LH, UC LH, UC RH, LC
Data words 131-200:
Channel modulo 4 0 1 2 3
Data LH, LC RH, UC RH, UC LH, LC
STATUS X011 11XX X1XX XXXX
Data words 003-130 contain RH, LC data;
Data words 131-200 contain LH, LC data;
PRA Mode 'FIXLOL'
-----------------
Instrument Mode ID : FIXLOL
Instrument Power Consumption : 6.7
Data produced every 30 msec; 25 msec of integration. Frequency
is fixed. Bandwidth is 1 kHz.
STATUS X100 00XX X0XX XXXX
Take the channel number modulo 4
Channel modulo 4 0 1 2 3
Data LH, UC LH, LC RH, LC RH, UC
STATUS X100 00XX X1XX XXXX
Odd numbered data words contain RH, UC data
Even numbered data words contain LH, UC data
STATUS X100 01XX X0XX XXXX
Take the channel number modulo 4
Channel modulo 4 0 1 2 3
Data RH, LC RH, UC LH, UC LH, LC
STATUS X100 01XX X1XX XXXX
Odd numbered data words contain LH, LC data
Even numbered data words contain RH, LC data
PRA Mode 'FIXLOH'
-----------------
Instrument Mode ID : FIXLOH
Instrument Power Consumption : 6.7
Data produced every 30 msec; 25 msec of integration. Frequency
is fixed. Bandwidth is 200 kHz.
STATUS X100 10XX X0XX XXXX
Take the channel number modulo 4
Channel modulo 4 0 1 2 3
Data RH, UC RH, LC LH, LC LH, UC
STATUS X100 10XX X1XX XXXX
Odd numbered data words contain LH, UC data
Even numbered data words contain RH, UC data
STATUS X100 11XX X0XX XXXX
Take the channel number modulo 4
Channel modulo 4 0 1 2 3
Data LH, LC LH, UC RH, UC RH, LC
STATUS X100 11XX X1XX XXXX
Odd numbered data words contain RH, LC data
Even numbered data words contain LH, LC data
PRA Mode 'VLOBRL'
-----------------
Instrument Mode ID : VLOBRL
Instrument Power Consumption : 6.7
Data produced every 30 msec; 25 msec of integration. Frequency
is fixed. Bandwidth is 1 kHz.
STATUS X101 00XX X0XX XXXX
Odd numbered data words contain LH, LC data
Even numbered data words contain RH, UC data
STATUS X101 00XX X1XX XXXX
All data words contain RH, UC data
STATUS X101 01XX X0XX XXXX
Odd numbered data words contain RH, UC data
Even numbered data words contain LH, LC data
STATUS X101 01XX X1XX XXXX
All data words contain LH, LC data.
PRA Mode 'VLOBRH'
-----------------
Instrument Mode ID : VLOBRH
Instrument Power Consumption : 6.7
Data produced every 30 msec; 25 msec of integration. Frequency
is fixed. Bandwidth is 200 kHz.
STATUS X101 10XX X0XX XXXX
Odd numbered data words contain RH, LC data
Even numbered data words contain LH, UC data
STATUS X101 10XX X1XX XXXX
All data words contain LH, UC data
STATUS X101 11XX X0XX XXXX
Odd numbered data words contain LH, UC data
Even numbered data words contain RH, LC data
STATUS X101 11XX X1XX XXXX
All data words contain RH, LC data.
PRA Mode 'XXXXXL'
-----------------
Instrument Mode ID : XXXXXL
Instrument Power Consumption : 6.7
STATUS X110 1XXX XXXX XXXX
No meaningful data are returned because the polarization
alternates every 69.4 microseconds, but the RC time constant is
100 microseconds.
PRA Mode 'XXXXXH'
-----------------
Instrument Mode ID : XXXXXH
Instrument Power Consumption : 6.7
STATUS X110 0XXX XXXX XXXX
No meaningful data are returned because the polarization
alternates every 69.4 microseconds, but the RC time constant is
100 microseconds.
PRA Mode 'POLHIL'
-----------------
Instrument Mode ID : POLHIL
Instrument Power Consumption : 6.7
Data produced every 69.4 microseconds, but sample-and-hold
operates once every 138.8 microseconds on both data channels
simultaneously (i.e. channels 2n-1 and 2n contain
simultaneously sampled data). Integration time is 100
microseconds with an RC circuit (i.e. exponential). Frequency
is fixed. Bandwidth is 1 kHz.
STATUS X111 00XX X0XX XXXX
Odd numbered data words contain LH, LC data
Even numbered data words contain RH, UC data
STATUS X111 00XX X1XX XXXX
All data words contain RH, UC data
STATUS X111 01XX X0XX XXXX
Odd numbered data words contain RH, UC data
Even numbered data words contain LH, LC data
STATUS X111 01XX X1XX XXXX
All data words contain LH, LC data.
PRA Mode 'POLHIH'
-----------------
Instrument Mode ID : POLHIH
Instrument Power Consumption : 6.7
Data produced every 69.4 microseconds, but sample-and-hold
operates once every 138.8 microseconds on both data channels
simultaneously (i.e. channels 2n-1 and 2n contain
simultaneously sampled data). Integration time is 100
microseconds with an RC circuit (i.e. exponential). Frequency
is fixed. Bandwidth is 200 kHz.
STATUS X111 10XX X0XX XXXX
Odd numbered data words contain RH, LC data
Even numbered data words contain LH, UC data
STATUS X111 10XX X1XX XXXX
All data words contain LH, UC data
STATUS X111 11XX X0XX XXXX
Odd numbered data words contain LH, UC data
Even numbered data words contain RH, LC data
STATUS X111 11XX X1XX XXXX
All data words contain RH, LC data.
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