There are two reasons. 1) Many of the screw clamps do NOT tighten enough to keep the element pieces from slipping. I used to test the clamps but tightening as much as possible (without stripping the
What else that works instead of rope, is either .125 SS cable.... or .09375 SS cable.. or galvanized winch cable in the same 2 sizes. Then a SS hose clamp to hold the cable to the outside of the tip.
Author: W4AAW@aol.com via TowerTalk <towertalk@contesting.com>
Date: Thu, 22 Jun 2017 09:29:08 -0400
1. The good quality screw clamps never rust. 2. The good quality screw clamps never rust. Bob is right about stainless. My yagis, erected in 2001 just got a thorough inspection. All of the all-stainl
Author: Patrick Greenlee <patrick_g@windstream.net>
Date: Thu, 22 Jun 2017 08:50:07 -0500
Adding weight inside the tube will do nothing for vortex shedding. The mass loading will change the mechanical resonance properties, perhaps avoiding the natural frequencies excited by the vortex she
Author: Patrick Greenlee <patrick_g@windstream.net>
Date: Thu, 22 Jun 2017 08:54:41 -0500
Be careful as some MFG or vendors advertise stainless steel hose clamps but they aren't 100% stainless steel. The screw of these is NOT STAINLESS and becomes a rust ball. Trying to tighten one of the
I have to jump in here.: <SNIP> 1) Many of the screw clamps do NOT tighten enough to keep the element pieces from slipping. I used to test the clamps but tightening as much as possible (without strip
A bit of advice ... as others noted the advertising can be a bit too vague and sadly there is indeed some real trash out there in the marketplace. When you see the word "stainless" don't stop there.
One point of concern ... and overall I agree with what Bob is saying here. If the mechanical/physical design between the two diameters is not correct, meaning there is an excessive measurable differe
I did not post anything about not using stainless steel clamps. I use 100% stainless steel hose clamps on my smaller tubing connections and SS bolted band clamps on larger tubing. My comment was that
The reason that most of the HyGain element screw clamps will not tighten the element is that the stainless bolt and nut will seize under pressure, and you will *think* it is tight, but it is not. The
One more experience - I found in assembly of TH7's that it took a few days for the materials and clamps to stress equalize. When re-tightening all fasteners it was quite surprising how loose many wer
<Why would the screw clamp have any effect on the elements braking? The <parts website seems to indicate that HyGain uses 0.028" wall thickness on <their 20m element tips. <http://www.hy-gain.com/Pro
Gary, I trust you are adjusting the element lengths on that Wilson 3 element 40 per some sort of NEC optimized dimensions and not the Wilson factory dimensions from the manual? The reason I ask is th
Author: GALE STEWARD via TowerTalk <towertalk@contesting.com>
Date: Thu, 22 Jun 2017 18:28:33 +0000 (UTC)
Some years ago, Dick Weber, K5IU did some work on this issue and I believe that he wrote an article that was published in CQ (or maybe QST). I haven't found it online but I didn't do a lot of digging
I think rope is just a patch for a poorly designed element. John KK9A Some years ago, Dick Weber, K5IU did some work on this issue and I believe that he wrote an article that was published in CQ (or
Hi Mike, I had heard in the past about the Wilson antennas needing to be optimized but have not looked into it. I have had this thing in storage for several years and have never had it up, bought it
John, You 100% correct ,,, the dampening is required because of taper design, As I said in one of my past posts,,,,, The Hi Gain 155 design with out dampening rope , wit ha slight breeze will vibrate
<I think rope is just a patch for a poorly designed element. <John KK9A or any other brand yagi with the myriad of swedges, and that probably includes M2, you have to do something to fix the vortex s