The lock washer may be the problem. I thought studies show that they can actually accelerate loosening. (in fact we can debate where structural steel bolt connections are "allowed" to use lock washer
? The title said "self supporter" so I was assuming no guys. Even with guys there would be some deflection/oscillation so I would think you'd want the joint to not slip..i.e. not have it depend on b
I was curious and found this. Taco sells the same tower that Wade did as Delhi The install instructions for Taco DMX are here http://www.tvantenna.com/products/tvreception/mounting/towers/taco/dmx/DM
It's easy or complicated, depending on your point of view. Here's a quickee estimate. You can sum up the point loads of the antenna, rotor, mast, and multiply that by 35/30 to get the vertical liftin
One way to distill the question of the joints (and applies to all self-supporting towers) If you just hand tighten the nut and bolt, (all 3) and then try to move the metal tower legs up and down, how
maybe someone can answer this for me. I've been thinking, that based on everything said, that cable corrosion is the main issue to worry about. Steve's example of motor-driven failures got me wonderi
I agree. I don't have any motors. 3 towers all with hand winches. (3 different hand winches by the way. Hey I also have a side mounted lj-155 on one HG-70HD above the 2nd section, but I'll not take t
O Jim, I think you're unfairly judging the products? (I'm not sure why that link was presented as an example) That link above is not his only offering, and each offering has differences. I think it's
I rescanned Jim's presentations about antenna analyzer inaccuracies. The use of AIM 4170 information seems to be in a lot of places, so I was wondering about comments about inaccuracies, at higher fr
This is all great and thanks for taking the time to go thru it yet one more time. Even though I've read the papers, it's great to see the give and take of slightly different points of view for really
Beautiful chart on that page Steve, thanks a bunch. I'd not seen your page before. Yes I agree that too often, we talk about measurements without error bounds. We'd have less disagreement, I think, i
I went searching just for fun... Hey you know it's gotta be good when K9YC is dropping references to CIA visits to his lair, when talking about baluns. I think this is the report in question. "FERRIT
I just ordered some 2.4" OD toroids using the part numbers K9YC provided. Arrow Electronics had prices that came close to the 250 piece prices jim quoted, for my small quantities. (www.arrow.com , ju
hey we have to poke a little fun, to make the work we do seem justified. check out http://cgi.ebay.com/Extendable-Retractable-Antenna-Tower-/250639792686? cmd=ViewItem&pt=LH_DefaultDomain_0&hash=item
The 2004 version of NFPA 780 is available here as pdf What do people think of that? http://www.atmo.arizona.edu/students/courselinks/spring07/atmo589/articles/NFPA_780_2004.pdf The problem is: does a
jim VE7RF mentioned the common use of crossover windings in toroid baluns, which is the area of some things I'm wondering about before I wind.... Questions: Wouldn't it be better to use less of the b
Yeah I was contemplating that, Joe. I had noticed balundesigns had a new balun (25:50) that does that idea with a smaller core..picture here http://www.balundesigns.com/servlet/the-92/1-cln-2-unun-25
To answer some of the questions: -1:1 current balun is the goal, 3.7-30mhz. 5k ohms choke impedance across the entire frequency span. I guess that's a basic question: Can it be done with one design?
I don't care about manufacturers. I'm just trying to decide what to make. You also showed that 12-16 turns of #14 THHN on a single type 31 core can have a much flatter response than the coax chokes,
http://www.superantennas.com/html/mp-1_portable.html lowest freq: 80M qrp to 300W What's the diff? apparently over 4000 sold worldwide. -kevin ad6z _______________________________________________ ___