See here:https://www.flickr.com/photos/n3ykf/16913167247/Looking at the photos, the elements are lying on paper that shows that the correct measurement as well as what should be the actualmeasurement
Just as a reference: I had a 141 rotating R45 tower in AZ ... the guys were attached at about 120 (top) and out ~105. I used 1/4 throughout. I used insulators throughout as well using the values prov
R65 is VERY heavy duty stuff ... coupled with 11200# philly Id suspect that it would indeed feel very strong! My point was only IF K7NVs analysis is correct and Im surely not in a position to dispute
Ok.... I read the Antenna Handbook... it says to use a chart they have reading it at 52 ohms line impedance (coax)... and 22 ohms RL I need 42 ohms of reactance. Then shorten the driven element to pr
Im sure this is in the manual somewhere forgive me for not digging for it... Ive modeled a 6 element 15... and I was wondering how one best models the boom bracket. I know for YW it uses a lump for e
Thanks John Id agree with you it isnt going to give the correct, with hairpin, driven element length unless I model it. If I used a transformer I could match it... but would rather figure out how to
Hello Joe, I figured it out. Or found out where to get the answer. Jeff had said that AutoEZ would do this so I read over their documentation and I see it is done using a transmission line and not an
Gerald, SUPER! Thanks. I was actually just there just now. I had figured out how to do it using a transmission line ... so I have a length of I believe 12 and a Zo of 300 ohms with a VF of 0.9 (value
Valmont, Anyone familiar with this company and their wares? They offer guy cable, at least 5/16 7 strand rated at 11,200# (same as Rohn 5/16 .. on paper) as well as 1/2 x 12 11,000# turnbuckles at re
Has anyone purchased/used one of these devices? Im interested in their ability to accurately do OSL and thus test an antenna at the end of a feedline. Also their construction (handle with kid gloves
I doubt Ill hit the target directly but possibly someone can help... I was thinking of using a DB18E for 40/30/warc along with stacked monos on 10/15/20 ... this is on a rotating tower so the antenna
3 is really close.... get it up even 2 more and I suspect youll notice a difference. Ideally 6+. Can you point the front of the antenna straight up and test it (up against the side of a tower maybe)?
Steve, Interesting.... my plans are for a 40M4LLDD mounted ~31 above the top antenna of a 2x6el stack on 15... when I model something similar (I happen to, at the time, be looking at a moxon on 40) I
Rohn says to use 8 #7 rebar (SERIOUSLY! 7/8!!) ... and then it shows #4 circular ties 2 1/2 OC with 2 cover with 24 laps huh? Ive always just dug a hole usually around 3 x 3 x 3 ... put the tower sec
how big a diameter is that circle? A couple feet? I've seen truckloads of coils of rebar going by me on the freeway, so I suspect it's something you can just order and cut to size. I suppose a suitab
thanks for all the comments.... it does seem like the foundation drawing they have appears to be more for pier pin than when a section is in the mix. Id think a section would provide tremendous ... c
So.... has anyone else done a mix where the Philly (PS) was less than 50% of the total length? I did a bunch of modeling and found using simply a 50 length of PS at the tower for the bottom 2 sets of
Dave.... please send me that file if you dont mind (and if it is ok with Optibeam). I asked Richard, N5ZC to test his 40M4LLDD recently .... I asked him to check to see what the SWR was on 15 (and 20
hispost. The 40M4LLDD is a different animal, its 15m resonance was previously posted |by N2IC.http://lists.contesting.com/archives//html/Towertalk/2015-09/msg00315.html John KK9A so.... not knowing
Ok.... Ive been reading through pasts posts and Ive digested both UNs book as well as the ARRL AB regarding each of these: -Shunt feed tower -reverse feed tower -plain jane vertical ... I had an inve