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SYSTEM DESCRIPTION, INSTALLATION, AND MAINTENANCE MANUAL
ASPIRE-400
(e)
"VSWR" OK/Unknown threshold status reported in ARINC-429 label 350 HPA
Maintenance word
(f)
"Actual Power Out Status" status reported in label 143 HPA Status word.
(3)
"Input Level" and "Output Level" is computed over the non-zero Sample Period
prescribed by ARINC-429 label 357 HPA Detector Sample Control word
(4)
During the current computing "Input Level" and "Output Level" Sample Period the
occurrence of an ARINC-429 label 357 HPA Detector Sample Control word with a
different but non-zero Sample Period is held in abeyance until completion of the current
Sample Period before becoming effective.
(5)
During the current computing "Input Level" and "Output Level" Sample Period the
occurrence of an ARINC-429 label 357 HPA Detector Sample Control word with a
Sample Period defined as "Period Sync" causes re- initialization of the existing Sample
Period upon detection.
(6)
"RF Power Input", "Actual Power Out", "VSWR", and "Actual Power Out Status" are
computed or assessed over the synchronous reporting interval prescribed by regular
scheduling of ARINC-429 labels 143 HPA Status word and label 350 HPA Maintenance
word.
D.
Input Power Detector Function
(1)
The HPA provides a sample of the input power at a point immediately after the input
attenuator and prior to the RF Power Amplifier function.
(2)
Within the measurement reporting tolerance, the sample of input power is not affected by
the enable/disable state of the PA function.
(3)
The sample of input power is implemented with a directivity > 20 dB.
(4)
The input power detector function that assesses the sample of input power is able to
measure signals in a logarithmic response over the input dynamic range with an
accuracy of less than ±0.5 dB over level and temperature.
(5)
The input power detector function provides broadband (Tx-band) rms power detection
with a nominal response time of 1 ms. The input power detector analog to digital
conversion oversampling capability should be at least two times that of the detector
response time.
(6)
The input detector operation and accuracy is independent of the carrier state (ie capable
of measuring input power when in the carrier-off state).
(7)
The input detection function is active at all times.
(8)
Commentary: This detector is used as part of an algorithm that adjusts the input
attenuator to compensate for the cable loss between the SDU and the HPA.
(9)
For the current ARINC-429 label 357 Aero Power word reporting interval the computed
average input level over the interval is reported as "Aero Power In" in accordance to the
following:
(a)
Only input power samples > -30 dBm are used in computation
(b)
Power samples are averaged in dB
(c)
Default value of -45 dBm is declared if no input power samples > -30 dBm.
(10)
For purposes of conveyance in ARINC-429 label 357 Aero Power word, the computed
average input level in dBm over the interval is expressed as a binary number in
accordance with the following formulation:
DRAFT
3rd rvw Draft as of:
29 January, 2020
Summary of Contents for 90402651-000
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