Viewing page 34 of 99

This transcription has been completed. Contact us with corrections.

31

TITLE 1/5/82
Project No.______
Book No.________

From Page No. _____

Called Graham Collins or FPEG FDA rewrite; he'll have an input done sometime today. Review by phone tomorrow. 

New TLM problem in POCC: 5 s/s parameters not getting acquired regularly (PCM-SM date acq timing varies as higher priority processes change DATA ACQ cycles)

Affects 10 parameters (mainly housekeeping types)
SUNYA=1; NRL=2 (sub multiplexed); UTAH=3; COL=1
TCE elect sys's=3.

Concerned that this also seems to mess up the sync pattern so can't figure out anything in stream. 

e.g. for 4 values/sec, slot 1 will get value #1 OK

[[image]]
slot 2 will get stale value #1 
slot 3 will get stale value #2 
slot 4 will get stale value #4 

MMU's
George Ralidis @ RID-
[Odetics units: 100 missions or 20K tape cycles created for NASA/ESA
-Counsels against pulling LRU til dump analyzed & failure clear.
-Suspects access/sequencing problem if tape not up to speed
READ or WRITE command received --> max volts to motor 
TACH lock phase: attempting to sync internal tack & oscillator
At some % of full speed, switches to TAPE LOCK 
Sync'd on control track
sets R/W speed valid indicator
R/W end specifies # blocks, not specific blocks 
Therefore, if motor slow to reach max speed, can start R/W late & get EOF before # BLKS = 0
-Spec for achieving TAPE LOCK=700 ms; factory releases LRU's in 400 MS range (test pins not wired into vehicle circuits)
Motor brush wear prime suspect.
-No lifetime/ cycling logging or testing done
-Maintainability of units always a prime RT concern-> no modularization/ cleanliness & precision reqmts
[[left margin note]] Call Stamper X3606 [[/left margin note]]

To Page No. 

Witnessed & Understood by me, _____________________
Date _______
Invented by _____________________
Recorded by _____________________
Date _______

Transcription Notes:
---------- Reopened for Editing 2023-03-30 10:12:48 ---------- Reopened for Editing 2023-03-30 10:23:59 ---------- Reopened for Editing 2023-03-30 11:28:59 TITLE ______________________ Project No.______ Book No.________ From Page No. _____ To Page No. Witnessed & Understood by me, _____________________ Date _______ Invented by _____________________ Recorded by _____________________ Date _______