REAL radios glow without smoke.
Designed 2014, Steve Jones, VK2YLD.
Material Copyright 2007-2019, VL2YLD
Material on this site is for informational purposes ONLY, whilst all reasonable steps have been taken to ensure accuracy, errors and omissions do happen, but it wasn't me and I didn't do it! ANY ACTIONS taken from this information is soley at YOUR RISK. However, please feel free to copy, print, repost anything you find useful.
Low Impedence line
Choke Balun of RG-58
Take this one mobile?
Survived the first rainstorm.
The hub and choke balun
Centre post wiring
Wiring up spreaders
Completed.. Testing begins
Centre post detail - Low Z line
VSWR on 20M band (high spot)
Here are a few snappys while I was building my 5 band hex-beam. Click the pics for enlarged view. The beam is an all-pvc pipe build and came together really well. It sits on a TV style rotator (50kg max) and has weathered a few great tropical storms since these were taken, and still survives!. After the testing was completed, it was relocated to the roof of the house on a 4m pole. The roof line is 6.5m up making the beam approx 10mAGL all up. Gets out well and receives nice quiet signals (Plasma TVs....eayuck!! NOISE!)
UPDATE - After surviving since 2006 in a tropical environment, the hex was dismantled in 2012 for our shift to a cooler climate. The rebuild will be a wideband version...
05-2013 :- Now we are in New South Wales, the cooler climate should be a bit less savage on the materials. I have reused most of the old antenna except for the coax feed and the spreaders. The feed was RG-213 and the sun had turned it hard and brittle. It basically fell to bits when I removed it from the centre post. The PVC spreaders were fixed in their bent position and were too long to pack as they were on piece construction. I have got the new dimensions for the wide band version and cut the new wires, got 6 new electrical-class conduits for the spreaders and decided to rebuild the choke balun and feed in RG-58, then the line from the shack to the rotator will be RG-213. The low impedence line down the post has been renewed, but the designs for the wideband version seem to use coaxial cable down the post. I still use 6mm2 multi-strand wire as it's easier to work with as I have stainless bolts and nuts to connect to the wires. I have also added 6m to the wire set, making it a 6-band inverted umbrella!! It doesn't keep the rotator dry though! I have posted the Excel spreadsheet here giving the dimensions I am using..