tribander=some kind á VHF/UHF multiband radio (I think). So that makes it off topic 73 Jim SM2EKM -- Jim White, K4OJ wrote: Carl wrote: The telrex tribander traps can't stand the heat of the C
Is something like this ever confirmed by field strenght measurements? 73 Jim SM2EKM -- Don Havlicek wrote: Yes! In my case ... 60 radials spaced 6 degrees apart .. then concentrations of ten radials
Comments below: corneliuspaul@gmx.net wrote: In my opinion, Jerrys question was best answered by N0AH. He describes exactly what any vertical/inv L builder will find out eventually: The more radials
You need no helicopter. In practical sense just measure the ground wave. We are not trying to confirm loobes in the vertcal plane, then you need helicopters. 73 Jim SM2EKM -- Jim Lux wrote: Hard to d
Yes but 4 wl long you will start to "modify" the far field and brewster angle would get smaller. What you then did would not be relevant for anything but your QTH, i e your type of far field...conduc
Understand. However in this case we are not trying to confirm loobes in the vertical plane. We are trying to improve the near field to get less R-loss, that we can confirm and measure without using h
Yes excactly, that´s the question. One example: I remember once when I was attending a antenna seminar at the Swedish Telecom one antenna guru professor was talking about how vertical antennas
Why a balun? 73 Jim SM2EKM -- Don Havlicek wrote: Tom, Good question! I never used a balun on the 80m vertical, but might when I replace the coax this Spring. I'll be interested in reading the respon
Yes a very small change is hard to detect. Also you have field strenght variations from one day to another or also variations during the day, ofcourse doing a A/B test would null that out but still.
Smart, why have I never thought about this. This would have saved me a lot of time and greef thru the years. Sure will use it next time I tram an antenna. Jim SM2EKM -- Pete Smith wrote: At 02:30 PM
Interesting, thanks for the info, might not be important after all to have a "even radial system". Then I ask myself, would the case be the same in an array, forexample a 4 square? Probably it seems
Nice installation, congrats. I like the view from the top of tower, nice. By the way, I just did get a AlfaSpid rotor so it?s gonna be interesting to see how it makes it in this rough climate. Haven?
If you have 60 radials, take a rest and be done with it, you are so close to "minimum" loss, ofcourse if you need the excersise and have nothing else to do you can go to work puting out more but it?s
Again, why a balun? StepIR should know better. If there are RF currents on the braid of the feedline you need to cut the braid, that is from an RF point of view. That you do with forexample ferrite b
So true so true, however not cold enough yet, I´ll wait until February when it can be -30 to -40F then whatever goes up sure will work great!! It´s so darn cold that Murphy doesn´t
Sorry but this is the hard way to do it. It is no problem to tram antennas complete, tuned up ready to go just bolt to tower. 3 el 40 on 12m boom is not a very big antenna to handle either. Years ago
Instead use a stub. I´m sure you have some scrap RG213 around, a T-connector and some PL259´s, wouldn´t take more then an hour to fix. Or make the antenna slightly reactive (longer)
Thank´s but I have read all that material, also I know what a balun is and when to use it however some people doesn´t seem to know since they use them when other things should be used ins
Indeed, I forgot about coiling up the coax, I´ve used it many times, workes great. Same here, no stores for UNUN, baluns and gizmo stuff, however I have a lot of 50 ohm coax, besides UNUN´
I shouldn´t write more on this reflector for about a week, think I must have filled my quota but yes indeed that´s a good simple way to do it, reliable, just seal it up and it would last