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0

Here is one of recommended methods: It's from The ARRL Handbook if I'm not mistaken. Personally I use two layers of electrical tape covered with two layers of varnish.


2

Properly applied tape is the appropriate solution: https://ham.stackexchange.com/a/12564/218 The box, and the connection between the connector and the box should already be waterproofed if the balun is made well. If not, you could always disassemble and put it back together with some silicone sealant, and add a weep hole somewhere for residual moisture to ...


4

In my experience, the small amount of exposed thread on the SO-239 after inserting the PL-259 is the primary challenge in weatherproofing this connection. The first line of defense is to orient the housing with the connector pointing toward the ground to prevent water from pooling around the joint, particularly in the presence of ice and snow. I break the ...


3

Adding a capacitor to a balun like that is not standard practice and is probably a bad idea. A bulun is supposed to be a somewhat frequency independent device which cancels out common mode current and a soon as that capacitor is added the unit becomes a tuned circuit with a limited bandwidth. My guess is that someone added the capacitor to adjust the SWR, ...


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Without having the ability to measure this particular one, I expect that it's to counteract the inductive reactance introduced as a side-effect of the balun design/implementation. Edited to add: check out this semi-related answer. In constructing his balun, he used a prototype with a variable capacitor to find the value with lowest SWR for his application, ...


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