I'm not convinced that you would need to waterproof it at all, but if
you're talking about the spray urethane foam used for sealing gaps
around windows like Great Stuff, don't bother. The sun eats that for
breakfast, lunch, dinner, and midnight snack every day of the week and
twice on Mondays and Wednesdays. You would have to coat it with a paint
or something to keep the UV off it.
Urethane caulk formulated for outdoor use is a different matter. That
holds up pretty well.
Dave AB7E
On 6/29/2017 10:30 AM, Dave Clemons wrote:
I have read Jim Brown's RFI-Ham.pdf (K9YC.com). In chapter 7 ("K9YC's
Choke Cookbook") he gives specifications for number of coax turns
using a big #31 ferrite clamp-on. I have built one of these, and it
will be installed at the feed point of a 40m sloper. Has anyone done
this, and if so, how did you waterproof the clamp-on? I would imagine
that ice will pretty quickly destroy the ferrite clamp-on. I would
prefer not to have to use an enclosure due to the added weight it will
bring to the sloper. I think that the expandable urethane based spray
foam sold in hardware stores, and used on RVs as well might be my best
bet, but I'd like to hear if others have tackled this problem.
Dave K1VUT
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