I've got some large diameter galvanised water pipe here (4" and 3" NB) and thought I'd make a telescopic mast like the Wilson. Can a Wilson owner tell me are the tubes in the Wilson mast all circular
length the work It's the welding of the channel rib onto the water-pipe that bothers me -I'm sure that the pipe will curl from the welding induced stresses. Also welding will damage the galvanizing o
Never freefall concrete into standing water, and never place any structural concrete into flowing water. The problem with pouring free-falling concrete into water is that the cement paste in the mix
Gun turrets have been suggested. A more available mechanism might be the slewing turntable from a old scrapped dragline or mobile crane. Mike ZL1BNB List Sponsored by AN Wireless: AN Wireless handles
To: <towertalk@contesting.com> Would Pumping is probably the tidiest method but don't forget that at the end of the pump you still have all the concrete in the pipeline to dispose of. Depending on th
"Pumping is probably the tidiest method but don't forget that at the end of the pump you still have all the concrete in the pipeline to dispose of. Depending on the length and internal diameter of th
I used the caisson technique to construct a base for a 60 foot self-supporting tilt-over telescopic mast. Couldn't dig a deep hole here due to high water table in estuarine sands, quite firm but any
Hi I'm looking for info on the Wilson and other tubular crank-ups. We don't get to see this make of mast here in ZL, but since I have some lengths of heavy wall steel pipe, I would like to build some
My thanks for the replies to my queries. I've learn't a lot about how these masts are assembled. I had the rope and pulley system figured out, but wasn't sure about the key, particularly how it was f
Hi all Has anyone modelled the Moxon loop with loading coils to further reduce the length of the elements, and if so what happened to the near 50 ohm impedance of the normal Moxon? Thanks MikeN ZL1BN
Has anyone got any design info on the range of guy tension which would be developed in using a 20 meter tower, top and mid-height guyed, and carrying say a 4-element 20 m monobander. tks de mike, zl1
Hi all I have just bought some unobtanium Andrew heliax connectors on EBay, but the supplier in Kentucky doesn't ship outside US. Is there some member of this group who could take delivery (shipped f
My thanks to the guys on this list who replied to my request re transhipping some Andrew connectors. I received 12 replies offering assistance, which shows what a great bunch of guys are on this list
Hi all Can any one on this list tell me approximately when this antenna was first marketed, and whether the design has changed over the years? Tnx de miken, zl1bnb ___________________________________
Hi all Looks like there are a few models called Thunderbird. The one I'm enquiring about has a diagram entitled TH11DX 5 band (14 - 30 MHz) Super Thunderbird Yagi Antenna. It has 11 elements. It's pr
Many thanks to all who responded both on and off list to my request for information. I have received many helpful replies to my query relating to the TH-11DX. 73 de miken, zl1bnb ____________________