Clear-Com RM-702 - Manual (Page 16)

R M - 7 0 2 T W O - C H A N N E L R E M O T E S T A T I O N 2 - 4
• The capacitance of the interconnect cable affects system frequency
response and sidetone stability. Total capacitance should not be greater
than 0.25 uF.
Portable Installation Cable: Practical cable for portable system
interconnections is flexible, two-conductor, shielded microphone cable. For
runs less than 500 ft. (152.5 m), a cable made of 24-gauge wire is acceptable.
For runs longer than 500 ft. (152.5 m), use a 20-gauge cable or larger.
Permanent installation Cable: Vinyl-jacketed shielded pair is the cable of
choice for permanent installations. Use a low-capacitance 20-gauge wire for
short runs of less than 500 ft. (152.5 m) and 18-gauge cable for runs greater
than 500 ft. (152.5 m). Placing the cable in conduit is recommended, but not
necessary.
Multi-pair cable that is individually shielded is acceptable for use in
multi-channel systems. For cross-talk considerations, the shields must be tied
together on both ends of the cable to produce the lowest possible DC path for
ground return.
DESCRIPTION OF FRONT PANEL CONNEC-
TORS
HEADSET CONNECTOR (FRONT PANEL)
Note: The following is a description of a recommended headset.
Mic Type --- Dynamic, for details see the technical specifications
Wiring
Pin 1 --- Mic common
Pin 2 --- Mic hot
Pin 3 --- Headphone common
Pin 4 --- Headphone hot
PANEL MIC CONNECTOR (FRONT PANEL)
Clear-Com provides two plug-in panel microphones for use on the RM-702.
The GM-9 is 9 in. (22.86 cm) long and GM-18 is 18 in. (45.72 cm) long. The
microphone is of the electret type. The microphone has a built-in 1/4 in.
(0.64 cm) phone jack for a connector. A mating receptacle is mounted on the
RM-702.
To install a GM-9 or GM-18 panel mount microphone, use the following
steps:
1. Check the set screw in the mic-mounting flange to make sure it is clear of
the threads in the bushing.
2. Screw the microphone into the bushing hand-tight.