A Case Study in NASA-DoD - The Black Vault

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Table C-2
C&DH CHANGES REQUIRED TO RUN STP MISSIONS ON THE AEM
~a Changes to AEM for
AEM Equipment STP Compatibility STPSS Equipment
Antennas Usable Antenna
Hybrid Usable Hybrid
S-band transmitter Replaceb Receiver
S-band transmitter
tTransmitter
S-band transponder
Command demodulator Replacec d Dual signal conditioner
Add (if necessary) Decryption unit
Comand decoder/processor Modify or replacee Command decoder
PCH encoder Modify (if necessary) f Dual baseband unit
Add (if necessary)g Encryption unit
Tape recorder Usable h Tape recorder
Bus controller (data
formatter)i
Sequencer timeri
Modify (if necessary)
Not on AEMJ
Computer
Remote comand processor Modify k
Not on AE-
Usablet
Data interface unit
Harness
aOnly AEM S-band equipmnt as on the SAGE will be considered.
bThe ADE spacecraft uses one antenna and transmitter for experimental
data transmission and another antenna an, a transponder for receiving commands
and broadcasting housekeeping information. Because of differences in
the uplink frequencies, at least the receiver portion of the transponder must
be replaced. If the current ADE communication configuration is to be maintained,
a transponder and a transmitter or two transmitters and one receiver,
are required. It may be possible to use STPSS receivers and transmitters on
the AEM. Otherwise, several other SGLS-compatible transmitter/receivers have
flown or will fly on Fleet Satellite Communication System, P72-1, P72-2, and
the S-3.
CThe STDN-compatible AEI command demodulator operates with binary FSK
coding. SCLS uplinks are ternary FSK so this unit must be replaced. The
receiver-demodulator unit on the S3 vehicle may be an appropriate replacement
for the receiver and demodulator on the AEM (capacity is 1000 bps).
dAEM requirements do not include a secure uplink. If a secure uplink is
required, then a decrypter must be added between the signal conditioner and
the command decoder and these items modified accordingly.