Users Manual

ALL

EFFECTIVITY

Page 4-26

22 Apr 2019

23-15-49

SYSTEM DESCRIPTION, INSTALLATION, AND MAINTENANCE MANUAL

ASPIRE-400

(h) If all of the input power samples in the reporting interval are < -30 dBm then the

"Output VSWR" status is reported as "VSWR Unknown" in ARINC-429 label 350

HPA Maintenance word.

5. Electrical Installation

A. Input Power Interfaces

(1) An AC powered SDU variant and a DC powered SDU variant will be produced. The

requirements in the AC and DC power input sections apply only to the matching variant.

(2) When operating in Class 6 or Class 7 and installed in a system with a HPA, the SDU

powering the SCM has a maximum steady-state power consumption of 75 W or no more

than 150VA when supplied with 115 VAC.

NOTE: The HPA is not powered by the SDU.

(3) The SDU automatically powers-on when primary power is applied.

(4) With the exception of small signal (<30V) communication signals and discretes the SDU

ensures that a single conductor carries current on only one ground or return.

B. AC Power Input

(1) AC Power Input characteristics and test requirements are further specified in the

Environmental Qualification Test Requirements section from the Aspire 400

Environmental Qualification Test Plan document listed in Appendix A.

C. AC Primary Power Interruptions

(1) The AC variant SDU maintains full functionality of the SDU (excluding Power-Over-RF

supply) and of the SCM (including heaters) for at least 200ms after the loss of primary

input power at -67ºF (-55ºC).

D. DC Power Input

(1) DC Power Input characteristics and test requirements are further specified in the

Environmental Qualification Test Requirements section from the Aspire 400

Environmental Qualification Test Plan document listed in Appendix A.

E. DC Momentary Power Interruptions

(1) The DC variant SDU maintains full functionality of the SDU (excluding Power-Over-RF

supply) and of the SCM (including heaters) for at least 200ms after the loss of primary

input power at -67ºF (55ºC).

F. Ground Reference Fluctuation

(1) The different ground reference fluctuation tests are all applicable to the equipment under

test, independent of the type of power supply (i.e. the DC tests and AC tests apply to DC

powered Units-under-Test and AC powered Units-under-Test).

6. Electrical Drawings

A. Electrical Drawings

(1) Refer to Figure 4-8 for the Aspire-400 Interconnect Diagram.

DRAFT

3rd rvw Draft as of:

29 January, 2020