Rssembly of a Field — ULIorthy, Integrated System

The laser receiver innards are placed inside a sturdy housing and secured in place. An adapter fitting is secured to the exit end, allowing the fitting of your choice of telephoto lens. The laser transmitter is housed with a collimator and is secured to the laser receiver by two aluminum brackets, rhis assembly requires good accuracy for main­taining close optical alignment, as any adjustment is via two micro-head adjusting screws for azimuth and elevation adjustments for fine-tuning.

You will note that the laser module is supported at its midsection by two rubber О-rings that provide a flexing motion both fore and aft. Compression springs are placed directly opposite the contact points of the micro-head adjusting screws. These springs load the position of the laser module beyond the optical alignment point and now require contact pressure of the micro head adjusting screws to adjust back into alignment against the spring pressure. The front points provide pivoting for elevation adjust­ments. whereas the rear points provide for the azimuth adjust.

Figure 13-16 Suggested system assembly—front view minus optics

MICRO ADJUST ELEVATION

Rssembly of a Field - ULIorthy, Integrated System

Parts and Fabrication Description

You must supply the following parts for final enclo­sure and assembly. Note that the recommended hous­ing is aluminum tubing with at least a ‘A-inch wall

thickness. Plastic PVC may be used for easier fabri­cating at the cost of mechanical stability.

• Main enclosure 23/« OD X l/4-inch wall alu­minum tubing. Fabricate a hole for the press fit of the handle section. Note l/4-20 holes for mounting to tripods.

Laser enclosure P/4 OD X 1/a — inch wall alu­minum tubing. Fabricate as shown for spring- retaining cutouts and holes for micro-adjusting verniers.

Rssembly of a Field - ULIorthy, Integrated System

Figure 13-17 Suggested system assembly—x-ray view of side

Handle l5/s-inch aluminum tubing for han­dle and battery enclosure.

Brackets Fabricate two brackets for securing the laser and main enclosure together. It is important that this step be as precise as possi­ble. as the two-enclosure axis must be parallel.

Control panel You may use the front panel of the laser receiver module. Fabricate additional holes for the test-tone switch and feed-through bushing for the cablc going to the laser section.

Rear panel For the rear section of the laser enclosure with a hole for cable bushing.

Lens mount adapter Fabricate for a ‘/2-inch — thick piece of PVC to fit into the innerdiame — ter (ID) of the main enclosure tube. Cut out

the center to mate with the telephoto lens of choice.

О-rings For sleeving over the laser module and sandwiching with the laser enclosure tube. The position along the length may be adjusted for besi movement using vernier adjusters. Experiment tor best results.

Springs Compression springs for maintaining a positive pressure against micro-adjusting vernier screws through their adjusting movement.

Micro-head adjusting screws For precise ele­vation and azimuth positioning.

Cable A multiconductor for 6-volt battery power and test-tone input to the laser module.

Switches For power and test-tone control to the laser module.

6-volt battery Uses a four AA battery pack for powering the laser module and is con­trolled by one of the switches.

• 9-volt battery For powering the test-tone cir­cuit.

• Telephoto lens An optional choice will greatly determine the potential range and per­formance of the system. Mates to the mount adapter.

• Cap Slip-on plastic cap for the retaining end of the handle.

* Cushioned headset with individual volume controls

Rssembly of a Field - ULIorthy, Integrated System

Table 13-1 Laser receiver parts list

Ref. #

Qty.

Description

Rl,4

2

10-ohm, ‘/4-watl resistor (brn-blk-blk)

R2,3,8,12,13, 15.16,17.18

9

І00К, ‘A-walt resistor (brn-blk-yel)

R5.20

2

IK. ‘/4-watt resistor (brn-blk-red)

R6

10K. ‘/4-watt resistor (brn-blk-or)

R7

2.2K, ‘/4-watt resistor (red-red-red)

R9,10,11,19

4

150K, ‘/4-watt resistor (br-grn-yel)

R14

1

3 meg, ‘/4-watt resistor (or-blk-grn)

R21

5K trimpot resistor

R22

10K pot and switch

Cl.7

2

100 mfd/25 vertical electrolytic capacitor

C2.4.5

3

1 mfd. 25-volt disc capacitor (104)

C3.14

2

47 mfd/2f>-volt vertical, electrolytic capacitor

C8, Ю. 13

3

01/25-vnlt disc capacitor (1U3)

C9

470 pfd. 25-vnlt disc capacitor (471)

Cll, 12

2

.001 mfd, 25-volt disc capacitor (102)

ICl

LM074 or 324 l4-pin DIP note

1C2

LM386 B8 pin DIP

Jl

Stereo jack for P1

CL1

9-volt battery clip

Ql

L14G3 phototransistor

LED I

1R light-emitter diode

PCI

HGAPC. PC. B

CAP1

2Ve-inch plastic cap

CAP2

2-inch plastic cap

EN1

63A-inch X 24/n-inch sked 40 PVC tube

HS3

High-quality headsets

EXTUBE

3- x 2-inch schedule 40 PVC (see Figure 13-13)

LENI

45- X 89-millimeter convex lens

LENRETl

2-inch plastic cap #A2 (see Figure 13-13)

Г J

Table 13-2 Laser transmitter parts list

Fief. #

Qty

Description

DB#

Rl 5

2

100-ohm, !/4-watt (br-blk-br) resislor

R2

470-ohm, ‘A-watt (yel-pur-br) resistor

R3.4

2

27-ohm. 4t watt (red-pur-blk) resistor

R6

5,000-ohm trimpot resistor 502

R9

1

IK, !/4-watt (br-blk-red) resistor

RL0

5.6 m, lA-watt (gr-bl-gr) resislor

Cl 7

2

.01 mfd/50-volt disc capacitor

C2

Ю mfd/25-volt vertical electrolytic capacitor

C3

I

1 mfd/25-volt vertical electrolytic capacitor

Zl

3-voll zener diode 1N5221B

01,4

2

PN2907 PNPT092 transistor

02,3

2

PN2222 NPN T092 transistor

LED1

Any high-brighlness LED

SOCK1

Four-pin transistor socket

BH1

Four AA cell holder

CL1

Baitery clip

Si

Small toggle switch; key or push butlon may be used

BUSS24

#24 bus wire for extension leads of SOCK1

WR6

12-inch #22 vinyl hookup wire

PCI

CWLl PCB

PCCWLI

LASMOD1

Laser diode with integrated optics

LASMOD

LD1

10-milliwatt, 880 rm laser diode; see text

IRLD1

HSINK

Special fabricated aluminum heatsink, lens holder, and hardware

HSINK

LENl

Basic lens in threaded fitting for 9-millimeter diode

LENS13

LEN2

15- X -25-millimeter double concave D( ‘V negative glass lens

LE15-25

LEN3

24- X 75-millimeter double convex DCX glass lens

LE247S

FN1

1- x ‘/№- wall X 7-inch length of clear polycarbonate tubing

1TUBL

835- X.6- X 2-inch length of schedule 401/’ inches PVC tubing

ADJMAL1

l/2-inch sked 40 female slip to male thread GENOVA 30405

ADJFEMALE

‘/2-inch sked 40 female slip lo female thread GENOVA 30305

CAP1

1-inch plastic cap

SWl

6-32 X 1/г-inch nylon screw

LABEL CLASS 111 BSET

Labels cert, class, and aperture

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