John, The Bird switches are bullet proof. Will handle high power and are super reliable. I use them in the shack for antenna and amplifier switching. Here is a 6 position one on ebay. http://www.ebay
Hi Roger, I am concerned now with my planned ground screen around the base of my tower. I am planning a shunt feed to the tower for 160. I will have separate elevated radials, 4 of them, at 14 feet a
Roger, Very good ! Your definitions are very ENLIGHTENING :-) 73, Bob K6UJ LIGHTENING - removing weight 73, Roger _______________________________________________ _____________________________________
I will be using 4 elevated radials. The ground screen is not attached to the bottom of the vertical (in this case the tower) and is not part of the radials system. It is to help reduce near field los
Thanks guys, I will attach the ground screen to the bottom of the tower also. I see your plan of sloping the elevated radials up from the base until their elevated height, Jim. I will try this. I rea
The putty epoxy sounds pretty good. I would like to try it. Where is the best place to find it ? Bob K6UJ On 1/24/16 6:54 PM, dw wrote: On weatherproofing connectors, I've used a material that is rat
Jim, The W300 is a worm drive reduction gear. I have a similar one on my US Tower 90 foot motorized tower. The first thing I would do is take out the fill plug on the upper side of the gearbox and se
good point Rick its not necessarily the gearbox Bob K6UJ The Hub City W300 gearbox on my US Tower 85 ft rotating mast appears to have seized after 12 years. Are you sure you don't have a bad bearing
The original lube in the Hub City gearbox is 90W petroleum based gear oil. They recommend using Mobil Synthetic Gear Oil SHC630 when changing the lube. It is also 90 W. The gearbox should be drained
Right from the horses mouth. I did the conversion just three months ago so it is recent input from Hub City. I am not a mechanical engineer so I cant relate to the ISO and viscosity specifications yo
My HDX589 gearbox takes one quart. $22 is not a big investment for a better gearbox lube. I also noticed a big diff in the heat generated also. Used to get hot to the touch after raising and lowering
Fernando, Great installation ! I love his QTH. I wish I had that much area for antennas, sigh..... thanks for sharing 73 Bob K6UJ On 2/13/16 3:08 AM, Fernando González, EC1CT wrote: GM everyone, A co
Great winch Rick ! I have the 90 foot version of the same tower. I use the armstrong winch method when tilting it over and yes it gives you a workout ! I did make a remote switch on a 20 foot cable s
OK, I will check it out. thanks Bob K6UJ Bob K6UJ The switch came prewired to the motor as part of the whole package. The switch is probably available separately from the usual suspects (Grainger, Mc
Rikki, The Orion 2800's are notorious for water ingress thru the top seal. This is a common issue with these otherwise great rotators. I bet this is the cause of your problems. I have completely rebu
Me again, I forgot to mention I just trimmed off the square bottom on the flashing so it is round. Bob K6UJ The Orion 2800's are notorious for water ingress thru the top seal. This is a common issue
Jon, Great pictures of using the Oatey flashing ! thanks for sharing. Bob K6UJ 73, Jon Pearl - W4ABC On 2/18/2016 9:08 PM, Robert Harmon wrote: Rikki, The Orion 2800's are notorious for water ingress
Tim, The first thing I see is that the tri-bander needs to be higher to get reasonable DX performance. From what you described the tri-bander is at 22 feet high and a 6M beam at 27 feet. Is 27 feet t
Interesting. Now I know why the big contest station towers are at 200 feet. Bob K6UJ Sent from Outlook Mobile I am looking to build my retirement station consisting of 4-265 foot towers with stacked
I use four elevated radials for 80m. What I did was hook up my analyzer to each pair, 90 degrees from one another, without connecting anything else tune for resonance (just like a dipole, which it es