CHAPTER 4. CRYSTAL UNIT SET, QUARTZ CK-31/FRC-93

TM 11-5820-554-12

CHAPTER 4

CRYSTAL UNIT SET, QUARTZ CK-31/FRC-93

I F stages. The packet is a waterproof plastic material

4-1. Description

containing a pouch for each crystal and one for the

Crystal Unit Set, Quartz CK-31/FRC-93 (Collins

crystal grippers. The complete packet may be

Crystal Packet CP-1) consists of a packet, a set of

snapped and strapped into the Collins CC-2 for

crystals for operation of the Collins KWM-2/2A over

transportation as part of a transportable station. The

their complete frequency range, and a set of crystal

folded packet is shown in figure 4-1 The unfolded

grippers for use in installing and removing crystals

packet showing grippers and the individual pouches

from the equipment. The crystals not supplied are

for the crystals is shown in figure 4-2. Each crystal

those for the range of 5.0 to 6.6 MHz. Operation

pouch is marked with appropriate band information

between 5.0 and 6.6 MHz is not desirable because of

and crystal frequency.

spurious responses of the equipment due to the second

harmonics of the variable

Figure 4-1. Crystal packet, folded.

4-2. Use

used. Remove the desired crystal from its pouch, grip

Unlock the crystal grippers, and grasp the crystal in

with the tool, and insert it in the socket determined by

the equipment with them. Figure 4-3 shows a crystal

gripped the proper way. Apply enough pressure on

4-3. Operator's Maintenance Instructions

the grippers to prevent slipping, and pull the crystal

from its socket. Place the crystal in the pouch marked

Other than keeping the pouch free of dust, no regular

for it with the pins showing from the open end. Refer

operator's maintenance is required. Organizational

to table 3-2 to determine the proper crystal for the

maintenance

required.

frequency band to be

4-1