receiver printed circuit board. The temperature at this place normally is about 20°C above the
environment temperature, hence temperature readings at 65°C are not unusual.
lbfr
(L-Band Frequency, MHz) Querying this parameter returns the L-Band frequency the receiver is
tuned to.
tflt
(Receive Level Fault, OK/FAULT) If the receive level falls below the alarm threshold which can
be set with the thrh parameter, the receiver responds 'FAULT' or 'OK' if if the level is above the
threshold.
sflt
(Synthesiser Lock Fault, OK/FAULT) If one of the PLL synthesisers in the receiver does not
lock, this parameter reads 'FAULT'. This happens if you tune the frequency out of it's valid range.
dflt
(D/C Supply Fault, OK/FAULT) The receiver monitors it's internal supply voltages. If one of
them is out of range, 'FAULT' is reported when querying this parameter.
adcv (Raw ADC Level, decimal 0..65535) Reading this parameter returns the raw A/D converter
reading with no calibration or filtering applied.
Measurement settings
freq
(RF receive frequency, MHz) This parameter controls the receiver's receive frequency.
Depending on the LO frequency settings made with the lof1, lof2 and edge parameters, the
frequency value either is expressed as the RF receiver frequency or the L-band frequency at the
receiver's input. If the '22 kHz Tone' parameter (ln22) is configured as 'AUTO', changing the
frequency also will switch the 22kHz modulation on the LNB power supply on or off, according
to the band of the frequency setting
rxpl
(Receive polarisation, H/V) If the 'LNB voltage' parameter (lnbv) is set to 'AUTO', the receive
polarisation may be set with this parameter. If lnbv is not set to 'AUTO', changing the rxpl
parameter has no effect.
attn
(Input attenuation, 0/10/20/30) The receiver provides a switchable input attenuator which lets
you adjust the input level in 10 dB steps. This is specially useful with large Antennas pointing to a
satellite which generates a high flux density. With the attenuator you may adjust the input level in
order to avoid saturation effects in the receiver. All input attenuator steps are calibrated, the
attenuation values are taken into account for the displayed receive level. Available attenuator
settings are 0, 10, 20 and 30 dB.
msbw (Measurement bandwidth, 6/12/30/100) The receiver provides four different measurement
bandwidth filters (6, 12, 30 and 100 kHz). The 30 kHz filter is suitable for majority of cases.
fltr
(Post detector filter, 0/0.1/0.5/1/5/10/50/100 The receiver's software applies a low pass filter to
the measured level values. This is much like the video filter at a spectrum analyser. Available
bandwidth settings for this filter are 100 Hz to 0.1 Hz in 1/5 steps. Lower bandwidth settings
make the reading more stable, reduce the fluctuation. Please keep in mind, it will take a noticeable
time until the level reading settles after an input level change with a very low bandwidth setting.
Setting fltr=0 disables the low pass filter completely.
scmp
(Spectrum compensation, dB) With this parameter set to 0.0, the receiver's level reading is
calibrated for a C/W signal. With this parameter you can set an offset (range -10.0 .. +10.0 dB)
which is added to the measurement reading in order to compensate for differences arising from
the received signal's spectrum shape. The spectrum compensation offset applies to the value of
the levl parameter and to level sent through the RS422 streaming output as well.
thrh
(Fault threshold, dBm With this parameter you set the level fault threshold. If the measured
level falls below this value, the receiver states a receive level fault. To disable the level fault, set
the threshold to a very low value, e.g. -199 dBm.
(C) 2020, SatService GmbH
www.satnms.com
LBRX-1MT-UM-2002 Page 14/21
