TM 11-5840-360-14-1-1
2.6.4 Installation Modifications
length. (This is a fine setting.)
Coarse adjustment is to be
NOTE
performed per the Trigger Delay
Adjustment procedure given in
Position transmission PCB's have U7
Section 5 of this manual.)
installed and link E1& E2 removed for
all configurations even though the IC is
b.
For dual system (two receiver
not necessary for single systems. Thus
transmitters and two indicators with
interswitch), install links on 4/5A2A6
all PCB's are the same.
PCB as follows:
2.6.4.1 Position Transmission PCB 4/5 A2A8.
(1)
Install links per step 2a above.
The modifications required on Position Transmission
(2)
Link terminal E33 to E35.
PCB 4/5 A2A8 depend upon system configuration. Modify
(3)
Determine waveguide run length
the 4/5 A2A8 PCB for the system installed as follows:
from receiver transmitter 1 to its
1. For a single system:
associated
pedestal.
a. Do not link terminals E1 and E2 on 4/5
Starting at E17, each terminal E17
A2A8 PCB (removed link if installed) .
through E26 represents 15 feet of
b. Install integrated circuit DM8820
waveguide run. Install link from E35
(166018-1) at U7 of 4/5 A2A8 PCB.
to the terminal between E17 and E26
which most nearly matches receiver
2. For a system with dual indicators (A and B
transmitter II waveguide run length.
and an interswitch:
(This is a fine setting; coarse
a. Do not link terminals E1 and E2 on 4/5
adjustment is to be performed per
A2A8 PCB (remove link if installed) .
the Trigger Delay Adjustment
b. Install integrated circuit DM8820
procedure given in Section 5 of this
(166018-1) at U7 of 4/5 A2A8 PCB.
manual.)
3. For a system with three or four indicators (A,
B, C, D) and an interswitch:
3. Acknowledge Pulse Links. - .Install links
a. Do not link terminals E1 and E2 on 4/5
on 4/5 A2A6 PCB as follows:
A2A8 PCB (remove link if installed) .
a. Link E42 to E43 for all indicators.
b. Install integrated circuit DM8820
b. For single system, link terminal E40
(166018-1) at U7 of 4/5 A2A8 PCB.
to E38 (14V acknowledge pulse).
c. Remove R62 and R63 from 4/5 A2A8
c. For any system having an interswitch
PCB of middle indicators, i.e.:
or a (Video Amplifier.) (but not both),
(1) Three-indicator (A, B, C) system:
link terminal E40 to E37 (7V
remove R62 and R63 from
acknowledge pulse) at all indicators.
indicator B only.
d. For any system having both an
(2) Four-indicator (A, B, C, D) system :
interswitch and Video Amplifier, link
remove R62 and R63 from
terminal
E40
to
E36
(3.5V
indicators B and C.
acknowledge pulse) at all indicators.
2.6.4.2 PRF Generator PCB 4/5 A2A6. - Check the links
4. For systems having two X-band or two S-band
on PRF Generator PCB 4/5 A2A6 as follows:
receiver transmitters and two indicators, remove link
1. Insure that no links are connected at
between terminals E50 and F51 on 4/5 A2A6 PCB in one
terminals E1 through E16 or E28 through E31 (coarse
indicator only.
delay). Link terminal E17 to E54 (U23 pin 9)].
5. For nautical mile radars, install links between the
2. Trigger Delay Links
following terminals on the 4/5A2A6 PCB:
a. For single systems (one receiver
E48 to E49
transmitter and one indicator, no
E44 to E46
interswitch), install links on 4/5 A2A6
For statute mile radars, install the links on 4/5 A2A6 PCB
PCB as follows:
as follows:
(1) Link terminal E32 to E34.
E44 to E45
(2) Determine waveguide run length.
E47 to E48
Starting at E17, each terminal E17
If the radar is changed from nautical to statute miles
through E26 represents 15 feet of
or vice-versa, refer to parts list for 4/5 A2A6 PCB for
waveguide run. Install link from
values and part numbers of crystal Y1 and inductor L1.
E34 to the terminal between E17
6. For interswitch/master slave operation, add
and E26 which most nearly
jumper (if necessary) as applicable per Table 2-6 to PRF
matches waveguide run
generator PCB 4/5 A2A6.
2-23
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