Users Manual

ALL
EFFECTIVITY
© Honeywell International Inc. Do not copy without express permission of Honeywell.
Page 4-25
22 Apr 2019
23-15-49
SYSTEM DESCRIPTION, INSTALLATION, AND MAINTENANCE MANUAL
ASPIRE-400
(a) The forward output power sample is expressed in dB with respect to +46 dBm
(40W) to the closest 0.5dB resolution.
(b) If computed result is > +3 dB then the computed result is clamped as +3 dB.
(c) If computed result is < -28 dB then the computed result is clamped as -28 dB.
(d) The numeric value to be conveyed is "Numeric Value" = computed result / 0.5
dB.
(e) The numeric value is expressed as a 2's complement signed binary number MSB
truncated to 6-bit.
(7) For the current ARINC-429 label 357 Aero Power word reporting interval the computed
average output level over the interval is reported as "Aero Power Out" in accordance to
the following:
(a) Only output power samples with a synchronous input sample > -30 dBm are
used in computation.
(b) Power samples are averaged in dB.
(c) Default value of +15 dBm is declared if no input power samples > -30 dBm.
(8) For purposes of conveyance in ARINC-429 label 357 Aero Power word, the computed
average output level in dBm over the interval is expressed as a binary number in
accordance with the following formulation:
(a) The computed average input level is expressed in dBm to the closest 0.1 dB
resolution.
(b) The numeric value to be conveyed is "Numeric Value" = ("computed average
input level (dBm)" - (+15 dBm)) / 0.1 dB.
(c) The numeric value is expressed as a 9-bit unsigned binary number.
(9) For the current ARINC-429 label 350 reporting interval the following applies:
(a) If the PA function is disabled then the "Output VSWR" status is reported as
"VSWR Unknown" in ARINC-429 label 350 HPA Maintenance word.
(b) Only output power samples when the PA function is enabled are candidates for
VSWR assessment.
(c) Only output power samples with a synchronous input sample > -30 dBm are
used for VSWR assessment.
(d) Instantaneous VSWR is calculated from the correlated output detectors incident
and reflected power levels.
(e) If all computed Instantaneous VSWR calculations are less than 2.0:1 in the
reporting interval then the "Output VSWR" status is reported as "VSWR OK" in
ARINC-429 label 350 HPA Maintenance word.
(f) If any computed Instantaneous VSWR calculations is greater than or equal to
2.0:1 in the reporting interval then the "Output VSWR" status is reported as
"VSWR Unknown" in ARINC-429 label 350 HPA Maintenance word.
(g) Should the Instantaneous VSWR calculations in the reporting interval result in
"VSWR Unknown" and the PA function is operating normally then the RED LED
flashs until such time as a subsequent reporting interval Instantaneous VSWR
computation results in "VSWR OK".
DRAFT
3rd rvw Draft as of:
29 January, 2020