Crestron electronic AM/FM/TV Tuner R

Operations Guide - DOC. 5833A Integrated AM/FM/TV Tuner: ST-TUNE •• 9

When calculating the wire gauge for a particular Cresnet run, the length of the run

and the load factor of each network unit to be connected must be taken into

consideration. If Cresnet units are to be daisy-chained on the run, the load factor of

each unit to be daisy-chained must be added together to determine the load factor of

the entire chain. If the unit is a home-run from a Crestron system power supply

network port, the load factor of that unit is the load factor of the entire run. The

length of the run in feet and the load factor of the run should be used in the following

resistance equation to calculate the value on the right side of the equation.

Resistance Equation

R = Resistance (refer to next table).

L = Length of run (or chain) in feet.

LF = Load factor of entire run (or chain).

R < L x LF

40,000 Where:

The required wire gauge should be chosen such that the resistance value is less than

the value calculated in the resistance equation. Refer to the table below.

Wire Gauge Values

RESISTANCE (R) WIRE GAUGE

4 16

6 18

10 20

15 22

13 24 (Double-CAT 5)

NOTE: All Cresnet wiring must consist of two twisted-pairs. One twisted pair is the

+24V conductor and the GND conductor and the other twisted pair is the Y

conductor and the Z conductor.

NOTE: When daisy-chaining Cresnet units, always twist the ends of the incoming

wire and outgoing wire which share a pin on the network connector. After twisting

the ends, tin the twisted connection with solder. Apply solder only to the ends of the

twisted wires. Avoid tinning too far up the wires or the end becomes brittle. After

tinning the twisted ends, insert the tinned connection into the Cresnet connector and

tighten the retaining screw. Repeat the procedure for the other three conductors.

Refer to the hookup diagram on the next page which shows ST-TUNE connections.

Other than making the power connection last, complete the connections in any order.

NOTE: Refer to the latest revision of the Crestron Network Modular Cable

Requirements (Doc. 5682) when making connections to the ports labeled NET. This

document can be obtained from the Products page (PRODUCT MANUALS,

Software and Wiring Diagrams section) or Downloads page (CABLES and

MANUAL Libraries, search for MODULAR.PDF) of Crestron’s website

(www.crestron.com). New users are required to register to obtain access to the FTP

site.

NOTE: The external power pack and AM antenna are supplied with the ST-TUNE.

All other modular cables, patch cords, or coaxial cables are not provided.