Better Solutions Are Within Reach
®
MODEL NUMBER:
PDI-772HE-IND
Document Number:
PD196-181R3
Individual Input Port Central Power Supply
Page 7 of 12
PDi Communication Systems, Inc. 40 Greenwood Lane Springboro, Ohio 45066 USA PH 1-800-628-9870 FX 937-743-5664
CATV Wiring
NOTE TO CATV SYSTEM INSTALLER: This reminder is provided to call the CATV system installer
’
s attention to
Article 820-40 of the NEC that provides guidelines for proper grounding and, in particular, specifies that the cable
ground should be connected to the grounding system of the building, as close to the point of cable entry as
practical.
COAX CABLE SPECIFICATION
Due to long cable runs encountered in hospital installations, RG-6 coaxial cable employing a solid copper center
conductor and copper shield is required. Cable run lengths between the central power supply and room mounted
televisions MUST NOT exceed 150 feet.
DO NOT USE copper clad steel center conductor style coax cable.
Recommended RG-6 coaxial cable numbers to use include Alpha9804C (non-plenum), Belden
9248 (non-plenum), West Penn 806 (non-plenum), or West Penn 25806 (plenum).
DO NOT USE copper clad steel center conductor style coax cable. This style of coax can be easily confused with a
pure copper coax as the steel center conductor is platted with a copper cladding - it looks like copper. As a test,
touch a magnet to the center conductor. If it sticks to the center conductor, you have steel hidden beneath a
copper cladding. DO NOT USE IT!
The number one installation problem is the use of the WRONG type of coax - one that employs a copper clad steel
center conductor. Remember, the coax must carry not only cable TV RF signal, but also the AC power hundreds of
feet from the central power supply to each television location. Unfortunately, the copper clad steel center coax
offers almost 10 times the electrical resistance compared to a coax with a pure solid copper center conductor. In
other words, a 15 foot length of copper clad steel coax electrically looks equivalent to a 100 foot pure copper cable.
The steel cable offers too much resistance to the low frequency AC power current. The typical problems are those
associated with low voltage - the TV operates erratically or not at all.
Cabling the Supply For Individual Signals
The PDI-772HE-IND is uniquely designed to provide individual inputs for each output, resulting in each TV
viewing a different signal. The PDI-772HE-IND provides a means to insert the output of an individual cable box
or satellite box onto a coax line power TV system.
