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1) MCL rates their TWTs to operate from 0 to 50 degrees Centigrade up to 10,000 feet of altitude.  This translates to 32 degrees to 122 degrees Farenheit. For each 1000 feet of altitude above 10,000, you must de-rate the system by 1.9 degrees Centigrade.  This means you subtract 1.9 degrees Centigrade from the upper end of MCL’s Specification. [0-50 at 10,000 feet becomes 0-48.1 at 11,000 feet. 0-46.2 at 12,000 feet, etc.]


2) Always be aware that when temperature reaches “dewpoint,” you will have precipitation. Therefore, it’s not a good idea to refrigerate your HPAs on a HUMID day by running the Air Conditioning prior to “warming them up”. If your HPAs are sucking outside air for cooling and you have allowed them to get cold, it will most likely ‘rain’ inside of your transmitters as soon as you turn on the blowers. This may lead to any number of transmitter problems...including but not limited to: Arcing and Sparking, Failure to comply with commands, Corrosion, Loss of feeds and revenue.

Things you can do to avoid this would be knowing the outside humidity, the inside temperature and the dewpoint.  Changing the parameters will change the dewpoint. Case in point: If the temperature of the HPAs is higher than the dewpoint, you will have no precipitation.  If you turn on and warm up the HPAs prior to turning on the air conditioning, it’s not likely that your units will have a condensation problem.

MCL’s spec on humidity is typically: 0-95%, Non-Condensing.

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