TM 5-6675-318-14
Table 4-21. CODE DESCRIPTIONS - Cont
A question (?) mark on the display following entry of code 41 indicates that no tape
i s i n s t a l l e d , t a p e i s i n s t a l l e d i n c o r r e c t l y , o r t h e r e c o r d e n a b l e t a b o n t he
recording side of the cassette is in the wrong position for recording data.
NOTE
If a cassette is installed when recording data and neither code 41 nor
code 42 is entered, data will be recorded starting where the tape is
p o s i t i o n e d . A l s o , i f t h e t a p e i s n o t p o s i t i o n e d a t t h e e n d o f t h e d a t a,
the alarm will sound when the MX 1502 attempts to write on tape after the
f i r s t p a s s d a t a i s r e c e i v e d . A c a s s e t t e f a i l u r e w i l l b e i n d i c a t e d o n t h e
status (code 50) display .
Code 42, Control End of Data
Enter code 42 to search a tape for the end of previously recorded data. This code
does not affect current position fix results. The tape cassette transport is
enabled to record satellite pass data at the end of the previously recorded data.
A question mark (?) on the display following entry of code 42 indicates that no tape
cassette is installed, tape cassette is wrongly installed, or the record enable tab
on the recording side of the cassette is in the wrong position for recording data.
LOOK is displayed while unit searches for the end of the data.
Code 43, Control Read Alert Data
Enter code 43 to search a tape previously recorded with satellite pass data and read
the
satellite
alert
data.
The
search
is
terminated
when
the
end
of
data
is
found
or
when the number of satellites desired is satisfied (refer to code 19 description).
The MX 1502 cannot acquire satellite pass data while searching for alert data. The
satellite alert data must not be older than 90 days. The alarm will sound if
s a t e l l i t e a l e r t d a t a i s o l d e r t h a n 9 0 d a y s , o r i f o r b i t a l p a r a m e t e r s f o r f e w er
satellites than desired (per initialization entry or code 19) are contained on the
alert tape. A check of code 18 will indicate how many satellites have been alerted.
NOTE
It is recommended that alert data be less than 30 days old.
4-127
