changing the de length has a very, very, tiny effect on f/b and gain... its only the slight difference in coupling due to the usually small changes in length that would cause changes to f/b and gain
I still prefer Belden. RG8 or RG213 for indoors stuff, only RG-213 for outdoors. Now??? What are your thoughts on brands? What about types? RG8? RG213? LMR400? BuryFlex? Something else? Thanks, de Do
normally when measuring ground resistances a higher voltage source is used to overcome the drift problems that you are seeing. There are also special methods used that require either a large remote g
what is the noise? does it have a power line frequency component? does it have other peaks in the spectrum, if so at what spacing? if it is just white noise is the direction dependent on the time of
some googling will show some experimental and modeled results for this... but a bit of thought will give you some idea of what is going on. consider for example a simple 2 element yagi that is tuned
DANGER WILL ROBINSON! those two examples are both BAD! first the SurgeX one appears to show that when the MOV arresters divert current to the ground/neutral they feed that to one component, but not t
in the grand scheme of lightning protection going from 120v to 200v is MUCH better than going from 120v to 200kv or more. We don't truly mean "equalize" and "same potential" here. When MOVs conduct,
that would be great if you didn't ever hook up an antenna, or anything with wires to pick up induced voltage from a nearby lightning strike, and didn't power anything that had a startup or shutdown s
His question is how do you determine the tension requirement for mixed guy materials. I would recommend using the lowest tension that you would get if each material were used for the whole guy... tha
Its out there... or at least the precursors for it: http://ieeexplore.ieee.org/xpls/abs_all.jsp?arnumber=364418&tag=1 http://ieeexplore.ieee.org/xpls/abs_all.jsp?arnumber=180351 http://teramobile.org
<but never a discussion on why or how radials actually effect the not really beyond the scope, but often leading to long heated discussions. it does get a bit more complex than that, but thats enoug
i have been through this a couple times now. the process usually goes like this: 1. get a pro like k7lxc or kc1xx to write up an estimate that includes EVERYTHING, travel time for crew, removal of br
as long as you use decent coax putting them in a can doesn't help shielding. you also may have to worry about heat buildup if you are running power. Hi all I want to upgrade and put more stubs on the
the answer is a definate maybe... with a caveat to 'do what the manufacturer says'. The problem is that as you move the guy point farther out you increase the length of the guys which also increases
no, its worse than that... he is going lower in frequency so needs an element and coax stretcher. fortunately it is only about 1% so shouldn't be too hard. Nothing is easy.... You might get away with
I don't know if i can trust my meters with such a high loss, but i think it is around 150 ohm... but i'm sure that none of the methods i used take into account the high loss. for instance, the minivn
Ok, we found the original engineer who bought the stuff... he has dim memories of using it as a long high voltage probe hooked to a plate capacitively coupled to a transmission line tower to measure
thats just a polyester rope not a tower guy material unless you need it for a temporary field day type tower. Hi TT'ers HNY Planning my spring 10 meter tower antenna 5/5 35'-72' rebuild. The 3/16 guy
maybe just use a real compass, lots cheaper than dropping an i-thingy off a tower! personally i just line up antenna booms based on known directions of either guy wires or some convenient object in t
yes, a nice thick blob of duct seal does seem to stop mice. i think they could eventually chew their way through the foam though so where i have used that to seal holes i have first packed in steel w