Nautel NX5 AM, Preinstallation Manual

Page: 41 / 89

NX5 PRE-INSTALLATION MANUAL COOLING REQUIREMENTS
PAGE 1.4.4 VERSION 0.1 2015-08-01
Table 1.4.1: Cooling Requirements for the NX5
Note:
Although normal program audio is generally equivalent to 50-75% continuous tone modulation,
Nautel recommends you design the cooling system for 100% continuous tone modulation, to allow
suffiicient overhead and for testing purposes.
Closed Loop or Forced Air Cooling Systems
Closed loop or forced air cooling systems can be used, if:
 the air is well filtered to prevent dust and insects from entering the transmitter, and
 a minimum of 375 cubic feet per minute (CFM) is supplied to the intake duct. If you are
ducting intake air to the transmitter, make sure to compensate for any pressure loss in the
ducting system when selecting an appropriate fan.
Heating
The transmitter room must contain a heating system that will ensure the ambient air temperature does
not drop below 0°C (32°F).
Carrier
power out
(W)
Modulation
depth
(m x100)
Average
power out
(W)
Waste heat
(W)
Waste heat
(BTU/hour)
Air conditioning
required in a closed
system (tonnes)
5,000 100% 7,500 1221 4167 0.35
5,000 75% 6,407 1043 3559 0.30
5,000 50% 5,625 916 3125 0.26