Originally Posted by Calaveras
I don't know where the ham antenna manufacturers get their swaged tubing from but you can get telescoping tubing from DX Engineering with/without end slits.
You can use hose clamps on the slit ends or sheet metal screws to hold the pieces.
All the DX Engineering tubing has 0.058" walls which allow the next size up or down to telescope without binding. You cannot slide a 1" OD tube into a 1" ID tube. There's no chance this will work and filing the hole larger is a nightmare.
Shipping costs for long tubes is insane. DX Engineering should have the lowest costs.
I'd get a can of their anti-seize compound should you ever want to disassemble the boom.
Although I don't think swaged tubing is necessary, if you insist I'd call M2 Antennas and ask if they would sell you the tubing. I think the sizes you're looking for are pretty standard.
They use swaged tubing that joins equal OD tubing together.
Single 12 foot lengths of 6061-T6 would be preferred.
However if I wanted 2 12 foot sections the shipping would be 128.00 for 48.00 worth of tubing.
I had looked through DX Engineering and had missed the nesting ability of the .058 tubes.
I have been searching through the .068 6061-T6 on other sites to sleeve over with the next size larger since the swaged didn't appear to be present.
As you say the swaged isnt necessary. What I wanted to do was match CM's tubing.
Nesting a 6 foot section of 0.875 in. OD should stiffen it up quite a bit and only add a little over 1lb.
Just have to come up with some end caps for the tubing.
I would through bolt the sections with stainless.
Anti-seize is invaluable when working on machinery. Use it all the time.
I would imagine the Mariner's Choice would be the way to go.
I have a small stack of quantums laying around now. I believe there are enough parts and brackets I believe for 2 builds.
My intent is to add the extra floating directors and extend the nose piece much like 300ohm or Stampeder did years ago to get extra gain.
I had a little escapade a couple of month ago involving a 1100 that was in great shape until the telephone it was mounted on snapped off at the ground from underneath me.
Oh yah. That exciting. The home owner thought I died and was impress with me dropping the pole on her house. LOL.
Funny thing is. None of the directors or plastic connectors for the elements on the nose or floating directors broke. Cant say the same for many of the elements or the booms.
Currently the booms are curved almost perfectly for rebuilding a 4251 I recently picked up. Dont try this technique at home.