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APPENDIX A: ICRI OPTIONS
250’ Radio Extension Interface (Cable Reel) P/N 179.6214
Positioning one or more of the radios, to be connected to the ICRI at a distance greater than the
length of the interface cable may be desirable for one of several operational reasons:
1.
The personnel associated with a radio will be located inside a building for which there is
poor RF coverage from the ICRI‘s location.
2.
The personnel associated with a radio will be located inside a tunnel or other below grade
area for which there is poor RF coverage from the ICRI‘s location.
3.
Radios operating in very close proximity to one another, negatively affect the performance of
other another, such as receiver desensing.
The personnel—equipped with compatible radios—in the same general location of the reel-mounted
radio, will be able to communicate with those operating radios or the handset also connected to the
ICRI.
The extension cable is inserted between the ICRI and the radio interconnects cable that is usually
connected directly to one of the radio ports on the ICRI front panel.
NOTE: Multiple reels of cable can be linked together for requirement of greater distance than 250
feet. There will be no degradation of the communications link for up to 5000 feet of cable, BUT it
is important to note that if the cable is run near a source of high electrical energy, “noise” from
such a device can be expected to be induced into the cable and reduce---possibly significantly---the
quality of the communications
.
It is strongly recommended that the radio link be tested before the personnel enter the area of poor
RF propagation, so that any defects with the cable or the connections will be noted before a safety
issue arises--due to a lack of radio communications.
FIGURE 29: CABLE REEL CONNECTOR
