Daktronics C44 - Manual (Page 19)

New Track 2-5
Installation
Intermediate and Speed Trap Distances
Refer to Drawing A-56354. With guard beam, the start line is the guard beam line and
all points should be measured from there. Without guard beam, the start line is the stage
line and all points should be measured from there.
Four different speed trap lengths can be used with the C-44. Each one starts at a different
point. Find the length to be used in the list below and mount the start of speed trap
photocells that same distance before the finish line. General practice is to use the 66'
speed trap.
Possible speed trap lengths: 2' 7-11/16"
13' 2-3/8"
66' 0"
132' 0"
Burn-out Box = 90 ft. from designated box to start line.
Photocells
Roll Out- Height of the beams must be adjusted as necessary, to provide 12" of roll
using standard dragster wheel/tire (22" diameter). Beam height must be low enough to
accommodate clearance rulings.
Infrared Photocell Mounts
Mounting- The photocell stands can mount to either the protective guard rail or
directly to a concrete surface. Ensure that the mount is level both horizontally and
vertically to ensure proper photocell alignment. Photocell mounts are equipped with
slots for side to side and up and down alignment.
Photocell Mounting
Mounting- Photocells with pipe mounts must be attached so the photocells are
secure. The 60' photocell must be 10 1/2 inches above the crest of the track. All
other interval photocells (i.e. 1/8th mile, speed trap, etc.) must be six inches above
the crest of the track.
Tree Mounting Considerations
The distance from the start line to the tree must be 38 to 40 ft. The height of the tree
should be 80 inches from the ground to the center of the pre-stage bulb.
Time Slip and Logging Printer Considerations
The Time Slip and logging printers will be Epson LX-300's standard. Locate the printers
as shown in the system diagram (refer to Drawing B-91012). Care should be taken when
choosing a site that can keep the printer from getting wet. The Time Slip printer cable
can be routed with the finish line cable or scoreboard cables. Note: The E.T. printer
requires two 18 awg twisted shredded pairs, Beldon 8760 (Dak W-1117). The shield
should only be connected to earth in the control tower.
Starters’ Box Interface Mounting
Refer to Drawing A-72242 for an example of the starters box interface. The starters box
interface has transmit and receive lines hard-wired between the starters box and isolation
interfaces, and it is hardwired to the start line for the starters console. J2, located on the
starters box interface, is an optional place to plug in the starters console. The starters box
interface is located in the control tower as shown in Drawings B-114631 and B-91012.