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11. MARK key  Press to select tape mark
function. MARK is used to mark a stored NOTE
location on tape to which tape can later be
positioned. This step is essential when operating a
Precision Echo VTR.
NOTE
5. Initiate MANUAL UNTHREAD by pressing L-2
• While in playback mode displayed image and then waiting 30 seconds prior to opening
size is reduced differentiating it from the AVTR door.
larger image displayed with live video.
• AVTR tape must be manually unthreaded CAUTION
before the tape can be removed from
AVTR. To prevent damage to carriage and tape,
do not pry carriage assembly up and
d. AVTR Tape Insertion. attempt manual removal of jammed AVTR
(1) Thompson TRT: tape.
(a) Open door. NOTE
(b) Insert tape.
Electrical power may be removed at this
(c) Close door. point if necessary.
(2) Precision Echo:
6. Open AVTR door and ensure AVTR tape is
(a) Open door. up or forward and in unthreaded position. If
(b) Insert tape. AVTR tape is not in up or forward and
unthreaded position, notify Maintenance.
(c) Depress locking lever.
(d) Verify cassette carriage has latched down. 7. Remove AVTR tape by pushing red ejection
button or green release lever.
(e) Close door.
NOTE 4-35. (CDS2) DATA TRANSFER SYSTEM.
The Data Transfer System (DTS) enables crew to • The Thompson TRT unit will thread rapidly load CDS with required mission data prior to
automatically if power is present. flight. The DTS can program CDS memory with
• The Precision Echo unit will thread following:
automatically if power is present, provided
the manual unthread command is not still 1. Aircrew checklist.
being initiated. If the unthread command
is still present, cycle the VTR C/B or 2. Initial position coordinates.
access the MFD VTR page and initiate
the stop command, to thread the tape.
3. 30 Waypoints and 30 targets, 10, TACAN
e. AVTR Tape Removal. stations with elevation, magnetic variation,
and nav frequency or channel TACAN mode,
channel and ID.
1. Verify AVTR door is closed.
2. Ensure electrical power is supplied to aircraft. 4. Flight plan of up to 20 waypoints.
3. Ensure ESSENTIAL BUS is in RUN. 5. Battlefield graphics list of up to 40 waypoints.
6. Prepoint List.
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TM 1-1520-248-10
TABLE 4-2. OH-58D AVTR COMPARISON MATRIX
VTR FUNCTION THOMPSON TRT PRECISION ECHO
406-377-003-101 406-377-003-103
MFD Video Synchronization Proper Sync. Does not sync. as well in fast and
rewind search modes.
Video Output of Unrecorded Tape Generates random noise signal (ISP “Blank” video output, i.e., there is no
expects signal at all times). signal. Signal ISP is always expecting
a signal, the interface between the
ISP and VTR may lock up.
NOTE: Will not receive “VTR FAIL”
advisory.
Tape Unthread Unthreads automatically when VTR Only means of unthread is via CDS
door is opened with power on. “UNTHREAD” command from cockpit.
Tape Eject Unthread via CDS command or by Unthread via CDS command,
VTR door (Power on A/C.) Press red activates release lever.
button.
Video Frame Counter “Linear” counter used. Counter will “Frame” counter used. If unrecorded
increment/decrement on unrecorded tape passes into passes into tape
tape in fast forward, rewind, or play counter, counter will not increment/
modes. decrement.
Tape Speed Rewind/Fast Forward Approx. 3 minutes end-to end. Approx. 6 minutes end-to-end.
with 2 Hour Tape
7. For each FM radio: a. XMIT manual frequency.
a. Manual channel frequency. b. XMIT frequency for channels 1-9.
b. Cue channel frequency and ID (SINCGARS c. RECV manual frequency.
only). For 17 presets, frequency and ID
(shared between FM-1 and FM-2). d. RECV frequency for channels 1-9.
c. Radio mode. e. Selective addresses for all channels.
8. For the UHF radio:
f. Radio mode.
a. Manual channel frequency and ID. For 17
presets, frequency, and ID. g. Scan list.
b. Radio mode. 11. IFF modes and 3/A code.
c. Up to six WODs, including dates (for HQII). 12. The pilot may at any time store all current
mission data into one of the three storage
9. For the VHF radio: locations in the DTS.
a. Manual channel frequency. 13. Laser codes A through H.
b. For 17 presets, frequency, and ID. 14. For ATHS:
10. For the HF radio: a. Net definitions for eight nets.
4-45
TM 1-1520-248-10
b. Subscriber lists for each net. NOTE
c. Transmit/receive authentication codes and A boxed LOAD FAIL will display in the
line number. center of the LOAD MISSION page if data
loading is unsuccessful.
　
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