Re: D hole plate to fit SO-239 bulkhead hole - SO-239 to BNC conversion
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Tom, when I worked for the government, we had the D-shaped punches but I never wondered at what price they came to us. $200 I can believe, all things considered. Even $100 is a bone-cruncher for me for something I may use a half-dozen times.
I'll use the star lock washer and use a flat washer under the nut. I will then crank down on the nut and assume the connector will never have to come off. If anyone did this followed by a drop of super glue AFTER super tightening, I'd have to go looking for doubts that it's not coming off. For me, the simplest way to go that works has the most merit.
Bob ¡ª KK5R
On Monday, July 6, 2020, 10:55:15 PM EDT, flatpickn via groups.io <flatpickn@...> wrote:
Patrick,?
The base on that one is too small. The SO-239 has a plate that is one inch square with the small holes about 3/4" apart.The base on the bnc you show is only about 3/4" square.?
Gary,
That's a good answer. At $6 a pop, ouch. But it's workable. Marshal sold 2 plates and 2 bnc connectors for $7.50. Still not cheap but better than $12 a pair. If I am not wanting to spend time out in the shop (no heat or air) purchasing them as a unit would be the way to go.
I bought a piece of 1" x 1/8" flat bar today. I can cut it up repeatably on the bandsaw. Then build a jig with two fences and a clamp to safely drill the holes on the drill press. Although, filing the D just takes forever. 1/8 aluminum won't be as bad as steel though. I only need three right now but I'll probably make 5.
Thanks to W9THC, he lead me down some search paths where I figured out that a blank Neutric panel might fit. And you can buy them with the d hole already in them. Although, all that I have found on the net so far are made of plastic, but I'll keep looking.
Bob, those knock out punches are nice, but they're too big for what we're talking about. I have a similiar set of Greenlees that I picked up used here and there. The D for a bnc is about 3/8" and 1/4" would be about right if your going to file the D. I did look for D panel punches, they run over $200 new. That means they'll be $100 or better on the used market.
Thanks
Tom?
w9kkq
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Bob Lunsford