You there with the AN/MPQ-4A radar set.
 You'd better lend an ear so you can learn how that HD-264 desiccant dehy-
drator might lower the boom on the beam of your radar set.
 You know the dehydrator's mounted on the antenna group and it's there so
the RF waveguide sections will get dry air under pressure. That's needed so you
won't have arcing of those beams or no beams at all.
 A sure way to put your dehydrator out of commission is to forget about the
oil in the motor and compressor assembly. You've got to check that oil as well as
change it.
 You change the oil in the gear box every three months or 500 hours of opera-
tion, whichever comes first. But, if those gears start making more noise than
usual, you'd better check the oil level right now.
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