Mounting Surfaces

punched conduit entrance locations.

mounting. When mounted at this angle the angle

(4) Using as 3/8 inch diameter drill, enlarge the

bracket is not used and the rear of the enclosure is

pilot hole(s) at the conduit entrance locations.

flush with mounting surface which requires two

(5) Using a 7/8 inch hole punch enlarge the 3/8

holes (symetrically spaced 33/8 inches apart) drilled

inch diameter hole. To facilitate the hole punch

using a 1/4 inch drill through the rear of the enclosure

operation, lubricate the drive screw threads and the

Drill the appropriate pair of enclosure

screw/die bearing surfaces.

(7)

mounting holes, using the indicated drill size, as

(6) Deburr all the holes and remove all metal

specified in step (6) above for the mounting config-

chips from the enclosure interior.

urations associated with each receiver location.

CAUTION

(8) Deburr all the holes and remove all metal

When the cover is removed from the receiver

chips from the enclosure interior.

and the microphone is exposed DO NOT

TOUCH the front of the microphone (gold-

2-11. Mounting Surfaces

plated cylinder) with any objects. Failure to

Securing the receiver and processor enclosures to

observe this caution can result in permanent

various types of mounting surfaces such as wood

damage to the microphone.

metal, or masonry, requires some ingenuity on the

part of the installer. Installations are not limited to

b. Receiver (fig. C-3). Prior to drilling holes in the

receiver enclosure, temporarily remove the pc board

the various suggested methods of approach that

(microphone attached) to prevent accidental damage

follow.

to them. Do not reinstall until enclosure is perma-

a. Wood. This type of mounting material presents

nently secured to the mounting surface, conduit is

the least difficulty. Position the enclosure in place.

permanently attached to the enclosure, and cables

considering adjacent approaches for ease in inter.-

have been run through the conduits.

connections. Using the enclosure mounting holes or

(1) Remove and retain the two 6-32 x 3/8 inch

the angle bracket mounting holes as a template,

long screws fastening the cover to the enclosure.

mark the mounting surface. Remove the template

and drill two holes (smaller than the number 12 wood

(2) Remove and retain the four 6-32 x 3/8 inch

long screws fastening the pc board (microphone

screws) in the mounting material. Secure the

attached) to the enclosure interior.

enclosure or the angle bracket in place using two

(3) Using a number 18 drill, drill one or two (as

number 12 x 3/4 inch long wood screws.

determined by the interconnection configuration)

b. Metal. These surfaces may consist of flat or

pilot holes through the enclosure at the center-

corrugated sheet metal, angle iron supports or steel

punched conduit entrance locations.

I-beams. Secure a convenient size wooden mounting

plate (3/4 inch thick plywood) to the metal surface

(4) Using a 3/8 inch diameter drill, enlarge the

using number 12 x 11/2 inch long sheet metal screws

pilot hole(s) at the conduit. entrance locations.

or construction type hanger clamps. Secure the

(5) Using a 7/8 inch hole punch enlarge the 3/8

inch diameter hole. To facilitate the hole punch

enclosure or the angle bracket to the wooden plate

operation, lubricate the drive screw threads and the

using the procedure in step a. above.

c. Masonry. These surfaces may consist of brick.

screw/die bearing surfaces.

solid concrete, or blocks with hollow cores. For both

(6) The mounting configuration selected (fig.

brick and solid concrete mounting surfaces, secure a

24) to obtain adequate protection against forced

convenient size wooden mounting plate (3/4 inch thick

penetration (para. 2-8) will determine which pair of

plywood) to the masonry surface as follows:

centerpunched mounting holes require drilling.

(a) Detail A of figure 2-4 permits 0 degrees

(1) To secure the wooden mounting plate to

mounting. Use of the angle bracket as a spacer

brick or solid concrete, perform the following steps:

(a) Drill four 1/4 inch holes in each corner of

allows sufficient clearance for removing and install-

the wooden mounting plate 1 inch in from each side

ing the enclosure cover after mounting. This

(b) Using the wooden mounting plate as a

mounting configuration requires two holes (symetri-

template, mark the location of the four holes in the

cally spaced 4 3/8 inches apart) drilled using a 1/4 inch

brick or concrete wall.

drill through the left side of the enclosure.

(b) Detail B of figure 2-4 permits a 45 degree

inch dia.), drill four holes approximately 1 inch deep.

mounting. Use of the 45 degree angle bracket is

(d) Anchor the STAR TAP-IN in the

required and this mounting configuration requires

masonry and secure the wooden mounting plate in

two holes (symetrically spaced 33/8 inches apart)

the masonry using four G-20 x 11/2 inch long Screws

drilled using a No. 14 drill through the left side of the

and flat washers.

enclosure.

2-9