More junk from Bob's CB shop.

My type n mount design consisted of these 2 parts combined.



Totally watertight

 

NMO bracket mount with type N connector underneath.

 

3/8-24 is the way to go for long heavy antennas. NMO is only good for lightweight stuff.

 

Here are pictures of the assembled NMO mounts. I ordered the mounts including cable assembly so I knew they would be compatible. Since N connectors are standard for 440 MHz base antennas I would surmise the SO 239/PL259 combination for CB and HF antennas is a cost saving for manufacturers.

 

Here's a creative mounting idea using a piece of sheet metal bent at a 90-degree angle.
Would work for NMO mounts

 

See rabbi the problem with the N type pass through is when it connects to the coil, you may have an issue with the continuity of maintaining 50 ohms. It may be far better to make one separate using AMP parts (seals, center insulator, etc. ...) than to cut one of these pass throughs up and try to adapt it.

By the way, using another N connector to adapt it to the coil will work but then you run into the problem of having too many connectors in feed line.

Do you know what is the insulating material for the coil?

 

I wasn't going use the copper wire coil.
I was simply going to take a 2-inch piece of solid Delrin plastic and machine a 5/8- 24 thread right through the center of the plastic insulator and screw the coupler right up inside the plastic. And then install a metal part with three-eighths 24 hole in the top of the plastic insulator and connect internally.