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On Mon, 28 Mar 2005 05:12:28 -0500, Larry W4CSC wrote:
By the way, for the Raymarine 2KW owners, the new radome has these little plastic feet to hold the radome up off the mounting by about 1/2 inch. The mounting bolts go through a hole in these feet. Looks like a patch for the problem of stainless steel bolts and pot metal holes they screw into making another galvanic battery to eat the chassis off from the bottom. Larry, Do you think threaded nylon stand-offs with 1/4-20 nylon bolts solve the problem? Norm B |
#2
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engsol wrote in
: Larry, Do you think threaded nylon stand-offs with 1/4-20 nylon bolts solve the problem? Norm B Not at all. The condensation problems stem from the dome being open to the air and exposed to the sun in a high humidity environment. It works the same as a nearly-empty gas tank sucking in cold, wet night air when the sun sets to condense inside all night and run down the walls, then blow air out the little rubber tit at the bottom of the radome when the sun comes up, boiling off what water it can in the heat of the day to create its own rainstorm inside the OPEN pot metal chassis to eat away at the electronics until the sun sets, again, to repeat the process. The problem is not the bottom mounting, the problem is the "gas tank effect" creating saturated hot air inside the dome because it's cheap to make an unsealed dome that doesn't have to withstand a few pounds of pressure...... |
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