That's why I suggested some sheet stock. An HVAC shop could easily bend flat stock to form a square cavity. Or a machine shop could roll some flat stock for a round cavity. I've always wondered about metal drain tubing like would be put in for a driveway. Old compressed gas cylinders may work. Remember, a cavity does not need to be round.
If you were to construct the helical style units, link Sinclair or Decibel also made, then you could use discarded aluminum air cylinders often used by firefighters. Lastly, if you can't find any large Heliax, you can make some air dielectric cable out of copper pipe. Chuck WB2EDV ----- Original Message ----- From: "skipp025" <[EMAIL PROTECTED]> To: <[email protected]> Sent: Monday, December 25, 2006 1:15 PM Subject: [Repeater-Builder] Re: 6M cans made from other metals You're not stuck with using Al-tube... Harken back to the day when people did a lot more by hand... Some (still unknown to me) Government Agency here in California made a whole bunch of Low-Band Cavities from scratch. Our Highway Patrol and much of the early Government Radio was set up in the 42-46 MHz range. I've seen probably 50 plus of the mentioned home brew "stove pipe" cavities in various locations. Someone figured out that standard galvanized stove pipe 1-ft diameter would work for the ap... and it does quite well. I have a number of these masse-built home-brew cavities bought surplus and they perform similar to same size commercial units. The cavity end sections were soldered on and braced with sections of angle iron. So you are not stuck using Al-tube... We now have a dual-wall stove pipe regulation so finding the older style single-wall stove pipe is a bit more fun... but I've eyed heating and air conditioning contractor materials in various supply stores... even a metal garbage can might work for your needs as done in the past magazine articles. If you don't have the money... get creative... cheers, skipp > "dave_g7uzn" <[EMAIL PROTECTED]> wrote: > Hi Chuck, I did make some enquiries about the price of the > ali tubing but gave up when 4 lenghs of 8" diameter tubing > alone was £750 (about $1500) Then there is all the insides > and engineering costs! I'm prepared to pay $1000 for a good > set of cans. > Cheers Dave UZN > > > > "Barry C'" <atec77@> wrote: > > I wish you would price the making of , as said previously I > > have done it at a fraction of used or new and for 6m I doubt > > you will have any luck to hop to it and start building . > > > > >From: "dave_g7uzn" <dave_g7uzn@> > > >Thanks for the link Chuck...I have seen it before but the > > > irrigation pipe is plastic in the UK! and to buy the raw > > > materials new would cost more than a second hand set > > > INCLUDING shipping. > > > Cheers Dave UZN Yahoo! Groups Links
